Mobile phone multiband/multimode transmit receive multiplexer has multiple band amplifier

The present invention relates to a method and a Device for transmitting data signals in several Frequency bands with amplifying means for amplifying the data signals and a filter device with at least a frequency band associated with the filter unit for Filtering the amplified data signals according to the respective one Frequency band. In particular, the present invention relates the connection of the transmitting devices of multi-mode or Multiband radios with the receiving devices as well as with one or more antennas.

First, here is a definition in connection with Multiple access methods in (especially digital) Given communication systems: FDMA (Frequency Division Multiple Access): Various Users are assigned different frequencies; TDMA (Time Division Multiple Access): Various Users are assigned different time slots; CDMA (Code Division Multiple Access): Various Users are assigned different codes; this allows simultaneous use of the same frequency; FDD (Frequency Division Duplex): transmit and receive occurs at different frequencies; TDD (Time Division Duplex): sending and receiving takes place in different time slots; Full-duplex system: send and receive takes place for same time.

Furthermore, the following abbreviations are used in this document used: AM: amplitude modulation; QPSK: quadrature phase shift keying; RRC: Root Raised Cosine; GSM: Global System for Mobile Communication; GMSK: Gaussian Minimum Shift Keying; EDGE: Enhanced Data for GSM Evolution; UMTS: Universal Mobile Telecommunication System.

Explained the invention and the prior art on Example of a mobile phone using the GSM and UMTS systems in covering the following bands (TX: transmitter; RX: receiver): GSM900 (TX: 880 ... 915 MHz; RX: 925 ... 960 MHz; FDMA and TDMA; TDD and FDD; GMSK modulation, ie constant envelope; hereinafter referred to as "GSM"); GSM1800 (TX: 1710 ... 1785 MHz; RX: 1805 ... 1880 MHz; otherwise identical to GSM900; in the following called "DCS") and or GSM1900 (TX: 1850 ... 1910 MHz, RX: 1930 ... 1990 MHz; otherwise identical to GSM900; hereinafter referred to as "PCS") and UMTS FDD (TX: 1920 ... 1980 MHz; RX: 2110 ... 2170 MHz; FDMA and CDMA; FDD / full duplex; QPSK modulation with RRC baseband filtering, ie AM share; hereinafter Called "UMTS") as well as optionally UMTS TDD (TX / RX: 1900 ... 1980 MHz; FDMA and CDMA; TDD; QPSK modulation with RRC baseband filtering, ie AM component).

For GSM, DCS and PCS you can choose between GMSK (no AM component) and EDGE (8PSK modulation with AM component) required be. In addition to the simultaneous operation of UMTS transmit and Receiving device should also be the GSM receiving device be operated simultaneously during a UMTS Carry out neighbor cell observation in the GSM network without the so-called "Compressed Mode" (short-term Interruption of UMTS transmission with corresponding increase the data rate in the remaining time) to apply. Parallel operation of UMTS and DCS receiving equipment is due the closely spaced frequency bands and the so associated high filter effort not provided here. During a GSM or DCS transmission is not parallel operation required because of TDD operation transmit and Receiving device are active at different times and because of TDMA operation Time slots for neighbor cell observation be available. Preferably, the mobile phone has only one Antenna.

<b>FIG.</b> 1 shows a hitherto conventional arrangement for a Mobile phone, which includes GSM, DCS and UMTS, taking for each Frequency band own power amplifier or own Train a multi-purpose power amplifier <b>1</b>. <b>2</b>. <b>4</b> used is (the rest of the transmitting devices is not here shown). At the output of each power amplifier may be one element each for power extraction <b>21</b>. <b>22</b>. <b>24</b>, z. B. a directional coupler, and in the UMTS path in addition an insulator <b>34</b> for the suppression of mismatch the antenna generated returning wave. At EDGE can also In the GSM and DCS TX path, one isolator each is required be. The actual power detection takes place z. B. with a Schottky diode, wherein for temperature compensation a second Schottky diode may be required. In the GSM and DCS Path follows a low pass <b>41</b>. <b>42</b> for the suppression of Harmonics generated by the power amplifier, in the UMTS path on the other hand, the transmission filter <b>44</b> of the duplexer <b>44</b>/<b>54</b>, that together with the insulator <b>34</b> also the function of Harmonic suppression takes over. The real function of the duplexer, the from two bandpass filters <b>44</b>. <b>54</b> exists, but is the Separation of UMTS transmit and receive band, because of the Full duplex operation not between transmitter and receiver can be switched. Before the UMTS LNA<b>14</b> (LNA: low noise amplifier, low-noise amplifier) ​​as the first stage of the UMTS Receiving device is the receiving filter <b>54</b> of Duplexer. The duplexer needs a very high isolation in the TX band, so that the remainder of the transmission signal the LNA is not overdriven, and in the RX band, so the rest of the the sender did not produce the noise System noise figure of the receiving device increased. Further Selection requirements arise in the transmission filter through the possibly necessary suppression of in the transmitting device generated interference signals such. From harmonics, Mirror frequencies or noise in certain frequency ranges and in the Reception filter by the necessary suppression of at the Antenna received interference signals. Before the GSM and DCS LNAs<b>11</b>. <b>12</b> as first stages of the respective receiving devices there is a bandpass filter <b>51</b>. <b>52</b> to Noise suppression (the rest of the receiving devices is not shown here).

Again, this is related to a definition of terms required with HF switches: &lt;n&gt; P &lt;m&gt; T: n pole m throw, "n-on-m switch".<b>Examples</b>SPDT: Single Pole Double Throw, "1-on-2 Switch"; SP4T: Single Pole Four Throw, "1-on-4 Switch"; DPDT: Double Pole Double Throw, "2-on-2 Switch".

GSM transceiver are (via the above described filter) with an SPDT switch <b>66</b> connected: DCS transceiver and antenna port of the UMTS duplexer <b>54</b>/<b>54</b> are with a SP3T switch <b>67</b> connected. SPDT and SP3T switches are in turn connected to the Low Pass Filter <b>76</b> or high-pass filter <b>77</b> the directly on the antenna <b>89</b> lying diplexer <b>76</b>/<b>77</b> connected. The diplexer separates in terms of frequency, the GSM band from the remaining bands, ie the Low pass filter must be 880. , , 960 MHz (hereinafter "lower frequency range") and the high pass filter of 1710 , , , 2110 MHz (hereinafter referred to as "upper frequency range") be permeable. The switch positions depend on the currently active bands, each with a maximum of one path in lower and one path in the upper frequency range at the same time be switched through (eg GSM RX and UMTS, UMTS TX and RX form a common path because of the duplexer).

The insertion losses between power amplifiers and Antenna should be as low as possible, so given Transmitting power the output power of the power amplifier as low as possible. A lower power consumption increases the Operating time of the device and reduces the generated Power loss and the associated warming. Between antenna and the LNAs, the insertion loss should be low so that the System noise figure of the receiving devices low and thus their sensitivity is high.

The harmonic filters and the diplexer are commonly referred to as LC filters with discrete or printed coils and Realized capacitors. For the receive filters and the duplexer in general, it is microwave ceramic or acoustic Surface wave filter, the high demands the duplexer in terms of insulation, insertion loss and Performance compatibility today usually only with Microwave ceramic can be met. The RF switch can z. B. with be implemented pin diodes or as a GaAs switch. At the Insulator is generally a ferrite circulator one of the three connections is terminated with 50 ohms. The directional coupler can be realized with line structures. If there is an isolator in the relevant transmission path (here: UMTS), so instead of a directional coupler and a capacitive or resistive decoupling done, because then no returning wave present and thus no directivity is required.

If additional PCS are to be implemented, then instead of the SP3T switch <b>67</b> a SP4T switch can be used where the fourth path is used for PCS RX. For PCS TX is no further path is necessary, as is usual for DCS and PCS due to the small frequency differences common power amplifier <b>2</b> is used. Should be in addition UMTS TDD are implemented, so the most obvious Solution also provides an additional path for UMTS TDD RX while for UMTS TDD TX the UMTS FDD power amplifier <b>4</b> can be used. Ie. here too, instead of the SP3T switch <b>67</b> an SP4T switch is required. In the case, that both PCS and UMTS TDD in addition to the other Tapes is implemented instead of the SP3T switch <b>67</b> a SPST switch is required.

A similar situation as here in the upper frequency range would result in the lower frequency range, if there are more Bands, such. The American 850 MHz band, need to be implemented. This can z. B. TDMA / TDD systems such as GSM or IS-136 or CDMA / FDD systems such as IS-95.

The object of the present invention is that To simplify power amplification in a radio to thus saving costs and circuit area.

According to the invention, this object is achieved by a Device for transmitting data signals in several frequency bands with an amplifying device for amplifying the Data signals and a filter device with at least one Frequency bands associated filter unit for filtering the amplified data signals corresponding to the respective Frequency band for the purpose of suppression of interference, wherein in the Amplification device Data signals from at least two of the several frequency bands can be amplified together and the Filter device for passing at least two of the several frequency bands is designed.

Likewise, the present task is solved by a Method for transmitting data signals in several frequency bands by amplifying the data signals and filtering the amplified ones Data signals as a function of the respective frequency band for the purpose of suppressing interference, wherein data signals of at least two of the multiple frequency bands in common amplified and let through while filtering.

Advantageous developments of the invention will become apparent the dependent claims.

By the present invention, at least one Power amplifier or at least one train of a mehrzügigen Power amplifier can be saved. Will a train of a Power amplifier used for multiple frequency bands, so this requires either a broadband matching circuit or a switchable narrowband matching circuit, wherein the switching z. B. can be done with pin diodes. Becomes a Train a power amplifier for systems with different Modulation method used, but at least one not all contain an AM share (eg UMTS and DCS), so is the working point by appropriate measures in each case so to adjust that in one case the linearity and in the other case the efficiency is good enough.

The saving of at least one power amplifier or of at least one move of a more generous one Power amplifier in the transmitting devices for the various Frequency bands or systems helps to save costs and space. Under certain circumstances, even more components can be saved become. All this allows for cheaper and smaller devices. In addition, if necessary, the insertion loss between Power amplifier (s) and antenna are reduced to at given transmission power, the output power of To be able to reduce power amplifier. A lower one Power consumption increases the operating time of the device and reduces the generated power loss and the associated Warming.

The invention enables in radios (e.g. Mobile phones) operating in at least two frequency bands or systems send and receive ("multiband" or "multimode"). Devices), the connection of the transmitting devices and the Receiving devices with one or more antennas, wherein at least one antenna used for several frequency bands becomes. As necessary in the receiving path (ie between antenna and receiving devices) a Bandpass filtering for suppression of the antenna received interfering signals and in the transmission path (ie between transmitting devices and antenna) a Power detection for power measurement or power control as well a filtering of generated in the transmitting device Noise signals such. As harmonics, image frequencies or noise in certain frequency ranges.

If necessary, in the transmission path also at Mismatch occurring at the antenna returning wave suppressed. This causes the power amplifier on Output always almost the same impedance "sees", though the antenna mismatches as a result of reflections (eg device on metal plate). A constant load impedance can help ensure the stability of the Power amplifier may be required or to a strong increase in the To avoid power consumption in case of mismatch. Especially but this may be necessary in systems whose Modulation method generates an AM component in the transmission signal. On An example of this is QPSK with RRC baseband filtering, as is z. B. is used in CDMA systems (eg UMTS). In In such systems, the power amplifier must be linear with it the AM component is retained and none by intermodulation caused excessive power in the adjacent channel is generated. Here is the linearity and thus the generated Adjacent channel power depending on the load impedance of the Power amplifier, ie too much adjacent channel performance even at To prevent mismatch on the antenna, either the returning wave are suppressed or the Power amplifier must be so linear that it is also at the worst case, mismatch is still linear enough.

However, it should be noted that a power amplifier the more power consumed the more linear it is. In contrast to the above modulation methods allowed one Modulation method with constant envelope, ie without AM Proportion, the use of power amplifiers in Compression operated, since linearity is not is required. An example of this is GMSK as z. In GSM is used.

If necessary, parallel operation of some will also be required Transmitting and receiving facilities allows. For example, are at an FDD full-duplex system transmitting and receiving device operating simultaneously (but at different frequencies; z. UMTS FDD, also called WCDMA or Wideband CDMA), while this is not the case with TDD systems, since transmit and Receiving device are active at different times (eg UMTS TDD and GSM, the latter being both a TDD and a an FDD system is because the transmitting and receiving device to different times on different frequencies active are). In addition, a parallel operation of different Be necessary systems to z. B. parallel to the operation in a system (eg UMTS FDD) neighbor cell observation in one other system (eg GSM) to do so Enable inter-system handover.

Preferably, the invention finds application in one Multiband / multimode mobile phone (see above), which in at least send three frequency bands in at least two systems and can receive, with the frequency bands each in a Transmit and receive band with intervening Duplex spacing can be divided and the individual Frequency bands can overlap. The frequency bands divide thereby in two frequency ranges, whereby the frequency bands within a frequency range relatively close together lie while the two frequency ranges are relatively far away from each other. Preferably located in at least one of the two frequency ranges both at least a TDD system to the transmitting and receiving device to different times are active (transmit and receive frequency may be the same or different), as well as at least one FDD full-duplex system. Preferably, at least involved in a system whose modulation Share generated in the transmission signal.

The present invention will now be described with reference to the attached Drawings explained in more detail, in which show:

<b>FIG.</b> 1 is a schematic diagram of a Circuit arrangement of a mobile phone according to the state of Technology;

<b>FIG.</b> 2 is a circuit diagram according to a first Embodiment of the present invention;

<b>FIG.</b> 3 to 6 variants of the embodiment according to <b>FIG.</b> 2;

<b>FIG.</b> 7 to 9 implementations of the block <b>99</b> in <b>FIG.</b> 6;

<b>FIG.</b> 10 is a circuit diagram of a second one Embodiment of the present invention;

<b>FIG.</b> 11 and 12 variants of the second embodiment;

<b>FIG.</b> 13 is a circuit diagram of a third one Embodiment of the present invention; and

<b>FIG.</b> 14 to 18 variants of the third embodiment.

The present invention will now be described with reference to several Embodiments described, with analogous to the description of the elements in <b>FIG.</b> 1 can be used.

To a common power amplifier <b>7</b> for DCS and UMTS to be able to use is in the first embodiment according to this invention <b>FIG.</b> 2 the common output of the power amplifier <b>7</b> with a SPDT switch <b>107</b> in a Split DCS TX and a UMTS TX path, making it possible is that otherwise the same structure as in <b>FIG.</b> 1 is used. However, this has the disadvantage that the Insertion loss increased by that of the switch.

In the same way can also be a common power amplifier <b>8th</b> for GSM and DCS, according to <b>FIG.</b> 3 is the common output of the power amplifier <b>8th</b> with a SPDT switch <b>108</b> into a GSM TX and a DCS TX path is split. This has opposite<b>FIG.</b> 2 the Advantage that uses for two frequency bands Power amplifiers for both GSM and DCS in compression can operate, however, the disadvantage that the GSM and DCS band are much farther apart than that DCS and UMTS band. Due to the large frequency spacing can instead of the SPDT switch <b>108</b> also a diplexer be used, with this possibility further down in the Related to another embodiment of the invention is discussed in more detail (see <b>FIG.</b> 12).

Finally, when using an SP3T switch <b>109</b> according to <b>FIG.</b> 4 also a common power amplifier <b>9</b> for GSM, DCS and UMTS are used.

alternative to <b>FIG.</b> 2 to 4 can also use two antennas be used, one for the lower frequency range on Output of the SPDT switch <b>66</b> and one for the upper one Frequency range at the output of the SP3T switch <b>67</b>, Thereby eliminates the diplexer <b>76</b>/<b>77</b> and both antennas can be narrowband. If no parallel operation of GSM RX and UMTS is provided, instead of the SPDT switch <b>66</b>, the SP3T switch <b>67</b> and the diplexer <b>76</b>/<b>77</b> can also be a SPST switch <b>69</b> according to <b>FIG.</b> 5 are used. In<b>FIG.</b> 5 is also shown a way how general (ie eg even with a structure according to <b>FIG.</b> 2) between an internal antenna <b>89</b> and an external antenna <b>89</b>'with an SPDT switch <b>129</b> can be switched. It can be either an electronic or a mechanical one Switch act, the latter has the advantage that no additional effort for the detection of the presence an external antenna is necessary.

If parallel operation of GSM RX and UMTS is planned, then instead of the SP5T switch <b>69</b> a SP4T switch is used be using one path in common for GSM RX and UMTS is used. This will be the UMTS duplexer<b>44</b>/<b>54</b> and the GSM RX-Filer <b>51</b> either via a diplexer or through impedance neutral interconnection ("triplexer") according to <b>FIG.</b> 6 on one merged common path. This has opposite<b>FIG.</b> 2 the advantage that in the paths GSM TX, DCS TX and DCS RX a lower insertion loss can be achieved since the Attenuation of the diplexer <b>76</b>/<b>77</b> goes away (of course, the SP4T switch a little because of the higher number of paths higher attenuation than an SP2T or SP3T switch). In the case of the impedance neutral interconnection can also the Diplexer be saved (otherwise he sits only on one other place). Instead of the SP4T switch can at Using an internal and an external antenna also a DP4T switch <b>69</b>' according to <b>FIG.</b> 6 are used, whereby the SPDT switch <b>129</b> is saved. in case of a SP5T switch <b>69</b> according to <b>FIG.</b> 5 is accordingly a DP5T switch possible.

Is also a parallel operation of DCS RX and UMTS provided, so can the UMTS duplexer <b>44</b>/<b>54</b> with the DCS RX filter <b>52</b> impedance neutral interconnected, which, however, because of the small frequency spacing of the DCS RX band from the UMTS TX band high demands on the filters. Because at Parallel operation must be comparable to the requirements of the UMTS duplexer (see above) sufficient isolation of UMTS TX after DCS RX be ensured in the two affected bands. In <b>FIG.</b> 2 would in this case instead of the SP3T switch <b>67</b>an SPDT switch suffice because a common path for DCS RX and UMTS would be used.

Especially for UMTS RX can also use its own antenna become. This is in<b>FIG.</b> 1 to 6 no duplexer <b>44</b>/<b>54</b> more required, since both individual filters have different antennas assigned. This has the advantage of having disorders that the UMTS transmission signal together with received at the antenna Noise due to nonlinearities in the switch <b>67</b>. <b>69</b>. <b>69</b>'generated, avoided. Because of the radio field attenuation between the two antennas are also reduced Isolation requirements for the two individual filters <b>44</b>. <b>54</b>, The same applies mutatis mutandis to the others Embodiments of the invention.

The distribution of the DCS / UMTS TX path into two separate paths with a SPDT switch <b>107</b> can take place after the ia multilevel power amplifier <b>5</b> as in <b>FIG.</b> 2 also before the last stage of the power amplifier according to <b>FIG.</b> 6 done (similar is of course also held <b>FIG.</b> 3 and 4 possible). It will be at least one level <b>7</b>'together for DCS and UMTS used while each having its own final level <b>2</b>' <b>4</b>' is used. Before the last stage, the Signal splitting with the SPDT switch <b>107</b>, This has opposite<b>FIG.</b> 2 the advantage that the insertion loss between last Stage and antenna can be reduced, but the disadvantage that less space and cost savings over two completely separate power amplifiers according to <b>FIG.</b> 1 possible is.

Usually, the part of the transmitting devices before the Power amplifiers do not exactly match the outputs that the Power amplifier would require. So it can be z. B. be required that the DCS TX output and the UMTS TX output with a SPDT switch <b>95</b> according to <b>FIG.</b> 5 on the common Power amplifier input must be merged. at Use only one power amplifier according to <b>FIG.</b> 4 would be in the case of three separate outputs for GSM TX, DCS TX and UMTS TX a SP3T switch required. It can be too be that a GSM / DCS TX output and a UMTS TX output according to <b>FIG.</b> 6 on a GSM and a DCS / UMTS power amplifier input must be switched.

In <b>FIG.</b> Figures 7-9 are three embodiments for the block <b>99</b> in <b>FIG.</b> 6 shown. In<b>FIG.</b> 7, the common GSM / DCS TX Signal first with an SPDT switch<b>98</b> in two signals divided up. The DCS TX signal and the UMTS TX signal will be turn with another SPDT switch <b>95</b> to a common DCS / UMTS TX signal combined. In<b>FIG.</b> 8 is the first SPDT switch <b>98</b> through a diplexer <b>91</b>/<b>92</b> replaced, consisting of a low pass <b>91</b> for GSM and a high pass <b>92</b> for DCS. This is due to the large frequency spacing of the GSM band from the DCS band easily possible. In<b>FIG.</b> 9 finally be the two SPDT switches <b>98</b>. <b>95</b> from <b>FIG.</b> 7 to one DPDT.Switch <b>99</b>'united, the path between the UMTS TX output and the GSM power amplifier input not is needed.

<b>FIG.</b> 5 finally shows a possibility, such as common power detector for GSM, DCS and UMTS in use can be used by two power amplifiers. To becomes a directional coupler <b>29</b>'used, its Auskoppelpfad to both power amplifiers are coupled.

To cost, space and insertion loss of the switch <b>107</b> to In a second embodiment, this is avoided Invention according to <b>FIG.</b> 10 the common output of the DCS / UMTS power amplifier <b>7</b> through the insulator <b>37</b> and the TX filter <b>47</b> of the duplexer <b>47</b>/<b>54</b> guided. Instead of SP3T switch <b>67</b> suffices here an SPDT switch <b>67</b>'. It must however, the insulator and the TX filter of the duplexer respectively be sufficiently broadband (1710 ... 1980 MHz). At the insulator this generally means a slightly higher insertion loss to the Edges of the frequency range. The TX filter of the duplexer on the other hand, as a bandstop filter (lock in the UMTS RX band) be executed, possibly with additional low-pass effect for Harmonic filtering. This allows u. U. a lower Insertion loss as a conventional bandpass filter. It must however, be aware that a filtering of in the Transmitter generated interference signals, such. B. noise in GSM RX and DCS RX band, is no longer possible. For DCS TX In this embodiment, a higher insertion loss is too expect as in <b>FIG.</b> Second

In the case of a common power amplifier for GSM, DCS and UMTS is a division of the Signal in a GSM and a DCS / UMTS path required. This can either use an SPDT switch <b>109</b>' according to <b>FIG.</b> 11 or due to the large frequency spacing with a diplexer <b>101</b>/<b>107</b>' according to <b>FIG.</b> 12 done. The diplexer consists of a low pass <b>101</b> for GSM and a high pass <b>107</b>' For DCS / UMTS. The GSM TX harmonic filter. 41 is possibly. no longer necessary if the low-pass filter <b>101</b>. <b>76</b> of the both diplexers have sufficient harmonic suppression. If the isolation of the SPDT switch <b>67</b>'too low, achieved in GSM operation that of the power amplifier <b>9</b> generated second harmonic over the high pass filter <b>107</b>' of diplexer <b>101</b>/<b>107</b>', the insulator <b>37</b>, the TX filter <b>47</b> of Duplexers, the SPDT switch <b>67</b>'and the high-pass filter <b>77</b> of the diplexer <b>76</b>/<b>77</b> the antenna <b>89</b>, For this reason, a SPST switch <b>107</b>"at the output of the high-pass filter <b>107</b>' of diplexer <b>101</b>/<b>107</b>'be required, in GSM operation is switched to ground to the isolation in the DCS / UMTS Increase TX path. This SPST switch<b>107</b>"can eg with a pin diode can be realized. Instead of the SPST switch to ground, a longitudinal SPST switch is possible in the DCS and UMTS operation is switched through. this means but generally a slightly higher insertion loss.

Opposite <b>FIG.</b> 10 the insertion loss for both DCS TX as well as for UMTS TX and around the switch <b>67</b>' to save, is in a third embodiment of the Invention a circulator <b>137</b> according to <b>FIG.</b> 13 used to the one causes the separation of transmitting and receiving paths and on the other hand the function of in <b>FIG.</b> 10 used insulator <b>37</b> should take over. The DCS RX filter and the UMTS RX filter are interconnected impedance neutral to a duplexer. Because of the isolation of the circulator, the decrease Requirements for the UMTS TX filter <b>47</b> and the UMTS RX filters <b>54</b>which is no longer a duplexer are interconnected. But because of mismatch on the antenna the returning wave also at the receiving filters <b>53</b>. <b>54</b> reflects and thus in the power amplifier <b>7</b> returns is the isolator effect very limited. For that reason too must the power compatibility of the receive filter <b>53</b>. <b>54</b> be big enough what z. In surface acoustic wave Filter in contrast to microwave ceramic filters Problem can be.

The problem of limited insulator effect can be simple Way to be solved in a phone in which instead of DCS PCS is implemented because the PCS RX band is about with coincides with the UMTS TX band. Then you can use UMTS operation according to <b>FIG.</b> 14 the PCS receive filter <b>53</b> via an SPDT switch <b>113</b> instead of the PCS-LNA <b>13</b> with a 50 ohm resistor connected (provided that it is here is a 50 ohm system). Because the PCS receive filter<b>13</b> permeable in the UMTS TX band, will be at mismatch of the antenna, the returning wave in the 50 ohm resistor absorbs and does not return to the power amplifier <b>7</b> back. The PCS receive filter <b>13</b> must be in the range 1920. , , 1930 MHz be still permeable, which may be the requirement of the High signal strength to the PCS-LNA <b>13</b> elevated. Is the RX filter <b>53</b> in the frequency range 1805. , , Permeable to 1990 MHz and is the LNA <b>13</b> sufficiently broadband and high signal strength, this way DCS can be realized as well. It is ia further filtering after the LNA <b>13</b> required, either with two separate filters for DCS and PCS, where previously a Signal distribution z. B. must be done with an SPDT switch, or with a switchable filter, wherein the switching the center frequency z. B. with a capacitance diode can.

Instead of the SPDT switch <b>113</b> can according to <b>FIG.</b> 15 also one SPST switch <b>113</b>used in the (DCS) / PCS Reception case is open. In UMTS transmission case is the switch closed. The length of the pipe<b>117</b>"is chosen so that the ia reflective impedance of the switched-off (DCS) / PCS LNAs transformed into an idle state. One possibly only partially Reflective impedance can be compensated by that a resistor is used that is slightly larger than 50 ohms is, so that the total impedance <b>50</b> Ohm yields.

Instead, the input impedance of the switched on (DCS) / PCS-LNAs be exploited, which may be quite to dispense with additional circuits before the LNA can. However, this increases the power consumption by the LNAs. In all cases mentioned here is on one to ensure sufficient performance compatibility of this LNA, the ever according to variant must be different high.

Become two separate receive filters for DCS and PCS <b>52</b>. <b>53</b> and LNAs <b>12</b>. <b>13</b> This can be done by a Impedance-neutral interconnection of DCS, PCS and UMTS RX filters too a "triplexer" <b>52</b>/<b>53</b>/<b>54</b> as in <b>FIG.</b> 16 done. Instead of but you can also use your own UMTS RX antenna to avoid a "triplexer". In addition, then the circulator <b>137</b> be narrowband. Another Possibility is switching between DCS RX filters on the one hand and PCS RX and UMTS RX filters on the other hand. This can be done with an SPDT switch or as in <b>FIG.</b> 17 with one SP3T switch <b>67</b>"The additional third path can be with a 50 ohm resistor to be completed, always during the DCS or PCS TX time slots is switched through. Thereby acts the circulator <b>137</b> also for DCS or PCS TX as Isolator, what kind of EDGE because of the linearity requirements may be necessary.

The same applies to additional implementation of UMTS TDD. Because without this 50 ohm resistor would need the PCS RX filter be even broadband (1900 ... 1990 MHz instead of 1920 ... 1990 MHz). UMTS TDD still requires an additional RX path, so that the switch <b>67</b>"should be executed as SP4T.

In the case of a common power amplifier for GSM, (DCS), PCS and UMTS can use the output signal with either an SPDT switch <b>109</b>similar to <b>FIG.</b> 11 or with one diplexer <b>101</b>/<b>107</b>similar to <b>FIG.</b> 12 split up become. The latter is in<b>FIG.</b> 18, wherein the filter <b>107</b>'for the upper frequency range in the UMTS RX band a high Must have blocking attenuation, since it is the UMTS TX filter <b>47</b> replaced.

In the first two embodiments of the invention will be two switches needed. These can also be in one be housed common component, for. B. on a common Semiconductor chip in the case of a GaAs switch. The same applies for the third embodiment of the invention, if also in lower frequency range a circulator is used. The then required two circulators can be in one common Component z. B. be accommodated according to EP 0777290 A1.<b>LIST OF REFERENCE NUMBERS</b><b>1</b>. <b>2</b>. <b>4</b>. <b>5</b>. <b>7</b>. <b>8th</b>. <b>9</b> power amplifier <b>2</b>' <b>4</b>' <b>7</b>'Amplifier stage <b>11</b>. <b>12</b>. <b>13</b>. <b>14</b> LNA <b>21</b>. <b>22</b>. <b>24</b>. <b>27</b>. <b>28</b>. <b>29</b>. <b>29</b>'Element for power extraction <b>34</b>. <b>37</b> insulator <b>41</b>. <b>42</b>. <b>76</b>. <b>91</b>. <b>101</b> Low Pass Filter <b>44</b>. <b>47</b>. <b>51</b>. <b>52</b>. <b>53</b>. <b>54</b> Bandpass filter <b>66</b>. <b>67</b>' <b>95</b>. <b>98</b>. <b>107</b>. <b>107</b>'SPDT switch 108, 109 ', 113, 129 67, 67 ", 109 SP3T switch <b>69</b> SP5T switch <b>69</b>'DP4T switch <b>77</b>. <b>92</b> High Pass Filter <b>89</b> Connection for internal antenna <b>89</b>'External antenna connection <b>99</b>. <b>99</b>'DPDT switch <b>107</b>" <b>113</b>'SPST switch <b>113</b>" Management <b>137</b> circulator