Amplification apparatus

The present invention relates to an amplification device, in particular, a distributor that inputs an input signal existing in a certain frequency band and distributes it to the first and second signals, and a first and a first that amplifies the first and second signals. The second amplifier, the first and second variable phase devices that can adjust the phase of the first and second signals passing through the first and second amplifiers, and the phase-adjusted first and first first The present invention relates to an amplification device having a synthesizer that synthesizes and outputs the amplification output of the amplifier of 2.

FIG. 7 is a block diagram showing a conventional example of this type of amplification device, and FIG. 8 is a graph for explaining the phase characteristics of the two amplifiers of FIG. 7. In the amplification device of FIG. 7, the distributor 50 distributes the input signal SS as the signal SA1 and the signal SB1 to the variable phase shifter 51 and the variable phase shifter 52. The variable phase shifter 51 adjusts the phase of the signal SA1 by the amount of the phase instructed by the control unit 53, and delivers it to the amplifier 55 as the signal SA2. The variable phase shifter 52 adjusts the phase of the signal SB1 by the amount of the phase instructed by the control unit 54, and delivers it to the amplifier 56 as the signal SB2.

The amplifier 55 amplifies the passed signal A2 and outputs it as a signal SA3, and the amplifier 56 amplifies the passed signal SB2 and outputs it as a signal SB3. The synthesizer 57 synthesizes the signal SA3 and the signal SB3 and outputs the output signal SQ. As shown in FIG. 8, the input signal SS exists in a wide band frequency range f0 to fp including a low band L, an intermediate band M, and a high band H. In this case, the phase quantities set in the control units 53 and 54 are set so that the phase deviation between the outputs of the amplifier 55 and the amplifier 56 disappears at one point of the frequency f2 in the center of the band M.

That is, the input signal SS is set to the signal of the frequency f2 of the band M, and the variable phase is set via the control unit 53 so that the phase of the output of the amplifier 55 has a phase p2 relationship with the phase of the input signal SS. Adjust vessel 51. Next, the variable phase device 52 is adjusted via the control unit 54 so that the phase of the output of the amplifier 56 has a phase p2 relationship with respect to the phase of the same input signal SS, as shown in FIG. Become in a state. A technique for operating two amplifiers in parallel and a technique for operating two amplifiers in parallel and reducing distortion have been proposed in the following documents (see Patent Documents 1 and 2).<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2000-183665 (Paragraph [0001], Fig. 1)</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2003-115793 (paragraph [0015], Fig. 1, Fig. 2)</text></patcit>

<p> In the amplification device that handles a wide band input signal as described above, the phase deviation of the outputs of the two amplifiers is small in the band at the specific frequency in the central part and its vicinity, but in the band away from the specific frequency, The phase deviations of the outputs of the two amplifiers are large, for example, the frequency f0._X, The phase deviation is particularly large at fp. At frequencies where the phase deviation is large as described above, there is a problem that a large synthesis loss occurs.</p><p> The present invention has been made to solve the above-mentioned problems, and regardless of whether the input signal is in any band of a wide band, the phase deviation of the outputs of the two amplifiers is reduced to reduce the combined loss of the outputs of the two amplifiers. It is an object of the present invention to provide an amplification device capable of reducing the number of</p>

<p> In order to solve the above-mentioned problems, the amplification device according to the present invention includes a distributor that inputs an input signal existing in a certain frequency band and distributes it to the first and second signals, and the first and second signals. First and second amplifiers that amplify the phase, and first and second variable phase devices that can adjust the phase of the first and second signals that pass through the first and second amplifiers, and phase adjustment. In an amplification device having a synthesizer that synthesizes and outputs the amplified outputs of the first and second amplifiers, the phase deviation of the outputs of the first and second amplifiers is as small as possible over the entire frequency band of the input signal. It has a control unit that sets the first and second variable phase devices so that the phase deviation of the output of the first and second amplifiers is minimized at a plurality of frequencies in the frequency band of the input signal. ..</p><p> According to such a configuration, the control unit of the amplification device selects, for example, the setting at the frequency closest to the frequency of the input signal among the settings at a plurality of frequencies, and the first and second variables are variable. By adjusting the phase device, the phase deviation of the outputs of the first and second amplifiers can be set to the minimum.</p><p> As a more specific amplification device, a distributor that inputs an input signal existing in a certain frequency band and distributes it to the first and second signals, and a first and first first and second signals that amplify the first and second signals. The second amplifier, the first and second variable phase devices that can adjust the phase of the first and second signals passing through the first and second amplifiers, and the phase-adjusted first and second In an amplification device having a synthesizer that synthesizes and outputs the amplified output of the amplifier, the frequency band of the input signal is divided into a plurality of divided frequency bands, and a band for determining which divided frequency band the input signal belongs to. A control unit that causes the variable phase controller to perform phase adjustment so that the phase deviation of the outputs of the first and second amplifiers is as small as possible within each determination division frequency band of the input signal determined by the determination unit and the band determination unit. It is preferable to have.</p>

<p> As described in detail above, according to the present invention, the control unit of the amplification device selects, for example, the setting at the frequency closest to the frequency of the input signal among the settings at a plurality of frequencies, and first. By adjusting the second variable phase device, the phase deviation of the outputs of the first and second amplifiers can be set to the minimum, thereby reducing the combined loss of the outputs of the first and second amplifiers. be able to.</p>

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the first embodiment of the amplification device of the present invention, and FIG. 2 is for explaining the phase characteristics of the two amplifiers of FIG. 1 when the input signal is detected to be in a low frequency band. Graph, FIG. 3 is a graph for explaining the phase characteristics of the two amplifiers in FIG. 1 when the input signal is detected to be in the middle frequency band, and FIG. 4 is a graph in which the input signal is in the high frequency band. It is a graph for demonstrating the phase characteristic of the two amplifiers of FIG. 1 when it is detected.

(Embodiment 1) In the amplification device of FIG. 1, the distributor 10 distributes the input signal SS as the signal SA1 and the signal SB1 to the variable phase shifter 11 and the variable phase shifter 12. The variable phase shifter 11 adjusts the phase of the signal SA1 by the amount of the phase corresponding to the control value instructed by the control unit 13, and delivers it to the amplifier 15 as the signal SA2. The variable phase shifter 12 adjusts the phase of the signal SB1 by the amount of the phase corresponding to the control value instructed by the control unit 14, and delivers it to the amplifier 16 as the signal SB2.

As shown in FIGS. 2 to 4, the input signal SS exists in a wide band having a frequency f0 to fp including a low band L, an intermediate band M, and a high band H. Further, information on which of the frequency bands L, M, and H the frequency band of the input signal SS belongs to is given by a higher-level device such as a base station. The amplifier 15 amplifies the passed signal SA2 and outputs it as a signal SA3, and the amplifier 16 amplifies the passed signal SB2 and outputs it as a signal SB3. The synthesizer 17 synthesizes the signal SA3 and the signal SB3 and outputs the output signal SQ.

In the above example, the control values CAL to CBH shown below are stored in the memories of the control units 13 and 14 so as to correspond to the information of the frequency bands L, M, and H given by the higher-level device. That is, the control unit 13 has control values CAL, CAM, CAH corresponding to the frequency bands L, M, H, and the control unit 14 has control values CBL, CBM corresponding to the frequency bands L, M, H. , CBH are stored in advance.

Frequency band LMH control unit 13 CAL CAM CAH control unit 14 CBL CBM CBH

In the amplification device of FIG. 1 in which such storage settings are made, when the input signal SS of the frequency band L is input, the host device (for example, a base station) indicating that the input signal SS is in the frequency band L Based on the information in, the control units 13 and 14 read the control values CAL and CBL from the memory (not shown) and give them to the variable phase units 11 and 12, respectively. In the variable phase devices 11 and 12, based on the control values CAL and CBL, when the frequency of the input signal SS is the frequency f1 in the central part of the frequency band L, the phase of the output of the amplifiers 15 and 16 is shown in the figure. Adjust the phase amount so that it becomes the phase p1 (reference value that eliminates the phase deviation between both outputs) shown in 2. When such phase adjustment is performed, the phase deviation of the outputs of the amplifiers 15 and 16 occurs when the input signal SS is other than the frequency f1, but as long as the input signal SS is in the frequency band L, the output of the output has a phase deviation. The phase deviation will be small.

Similarly, when there is information from a higher-level device that the input signal SS is in the frequency band M, the control units 13 and 14 read the control values CAM and CBM from the memory based on this information, and the variable phase. Give to vessels 11 and 12, respectively. In the variable phase devices 11 and 12, based on the control values CAM and CBM, when the frequency of the input signal SS is the frequency f2 of the frequency band M, the phases of the outputs of the amplifiers 15 and 16 are shown in FIG. Adjust the phase amount so that the phase is p2.

Further, when there is information from a higher-level device that the input signal SS is in the frequency band M, the control units 13 and 14 read the control values CAH and CBH from the memory based on this information, and the variable phase device. Give to 11 and 12, respectively. In the variable phase devices 11 and 12, based on the control values CAH and CBH, when the frequency of the input signal SS is the frequency f3 of the frequency band H, the phases of the outputs of the amplifiers 15 and 16 are shown in FIG. Adjust the phase amount so that the phase is p3. In this way, when the phase adjustment corresponding to the information about the frequency band of the host device is performed, the outputs of the amplifiers 15 and 16 are as long as the input signal SS is within the frequency band range corresponding to the information from the host device. The phase deviation of is small over the frequency bands L, M, and H of frequencies f0 to fp. Therefore, it is possible to perform power synthesis that minimizes the synthesis loss due to the synthesis of the outputs of the two amplifiers 15 and 16 by the synthesizer 17. In the above example, the information on which frequency band the input signal SS is in is received from the host device, but it goes without saying that the amplification device itself may detect it.

(Embodiment 2) The purpose of the amplification device shown in FIG. 5 is to be able to handle a case where frequency information is not given from the host device. In this example, the unbalanced output port of the synthesizer 17 is connected to the detector 22 that detects the output level via the directional coupler 21, the output of the detector 22 is input, and the level is set to the lowest level. A control unit 20 that controls the variable phase detectors 11 and 12 is arranged so as to be. Therefore, even if there is no frequency information, the control unit 20 controls the variable phase detectors 11 and 12 with reference to the output level of the detector 22, and minimizes the output level of the detector 22 to minimize the output level of the detectors 15 and 16. Power synthesis can be performed by minimizing the phase deviation between the outputs and minimizing the synthesis loss.

(Embodiment 3) The amplification device shown in FIG. 6 is the same as the amplification device shown in FIG. 5, and an object thereof is to be able to cope with a case where frequency information is not given from a higher-level device. In this example, the unbalanced output port of the synthesizer 17 is connected to the detector 32, which detects the output level via the fixed attenuator 31, and the output of the detector 32 is input, and the level becomes the lowest. A control unit 30 that controls the variable phase detectors 11 and 12 is arranged as described above. Therefore, even if there is no frequency information, the control unit 30 controls the variable phase detectors 11 and 12 with reference to the output level of the detector 32, and minimizes the output level of the detector 32 to minimize the output level of the detectors 32 and 16. Power synthesis can be performed by minimizing the phase deviation between the outputs and minimizing the synthesis loss.

<figref num="1">It is a block diagram which shows Embodiment 1 of the amplification apparatus of this invention.</figref><figref num="2">It is a graph for demonstrating the phase characteristic of the two amplifiers of FIG. 1 when it is detected that an input signal is in a low frequency band.</figref><figref num="3">It is a graph for demonstrating the phase characteristic of the two amplifiers of FIG. 1 when it is detected that an input signal is in an intermediate frequency band.</figref><figref num="4">It is a graph for demonstrating the phase characteristic of the two amplifiers of FIG. 1 when it is detected that an input signal is in a high frequency band.</figref><figref num="5">It is a block diagram which shows Embodiment 2 of the amplification apparatus of this invention.</figref><figref num="6">It is a block diagram which shows Embodiment 3 of the amplification apparatus of this invention.</figref><figref num="7">It is a block diagram which shows the conventional example of an amplification apparatus.</figref><figref num="8">It is a graph for demonstrating the phase characteristic of two amplifiers of the amplification apparatus of FIG.</figref>

Code description

10 Distributor, 11,12 Variable Phaser, 13,14,20,30 Control, 15,16 Amplifier, 17 Synthesizer, 21 Directional Coupler, 22,32 Detector, 31 Fixed Attenuator.