Nova Patents
EP1515430A1

Mixer for the conversion of radio frequency signals into baseband signals

Abstract

The invention relates to a mixer for converting a radio frequency input signal (1) to a baseband output signal (2, 3) comprising a number N of input switching means (21, 22, 23, ..., 29) for sampling the radio frequency input signal (1),a number N of integrator means (31, 32, 33, ..., 39) for integrating the output signals of the input switching means (21, 22, 23, ..., 29),a switch controller (10) for controlling the input switching means (21, 22, 23, ..., 29), andat least one summing means (41, 42, 43, ..., 49, 51, 52, 53, ..., 59, 60, 70) for calculating a weighted sum (2, 3) of the integrator means output signals.

EP1515430A1, drawing sheet 1
Sheet 1 of 6

Term

Term ended

Projected expiry passed 15 September 2023, 3 years ago.

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9 claims: 6 independent, 3 dependent

  1. 1
    A mixer for converting a radio frequency input signal (1) to a baseband output signal (2, 3) comprising - a number N of input switching means (21, 22, 23, ..., 29) for sampling the radio frequency input signal (1), - a number N of integrator means (31, 32, 33, ..., 39) for integrating the output signals of the input switching means (21, 22, 23, ..., 29), - a switch controller (10) for controlling the input switching means (21, 22, 23, ..., 29), and - at least one summing means (41, 42, 43, ..., 49, 51, 52, 53, ..., 59, 60, 70) for calculating a weighted sum (2, 3) of the integrator means output signals.
  2. 5
    The mixer according to any of the preceding claims, characterized in that each one of the integrator means (31, 32, 33, ..., 39) is designed to integrate the radio frequency input signal (1) over a fixed interval of the carrier period of the radio frequency input signal (1).
  3. 6
    The mixer according to any of the preceding claims, characterized in that the radio frequency input signal (1) is connected to the inputs of the N integrator means (31, 32, 33, ..., 39) by means of the N switching means (21, 22, 23, ..., 29).
  4. 7
    The mixer according to any of the preceding claims, characterized in that each one of the N integrator means (31, 32, 33, ..., 39) is designed so that the integrating interval is substantially the same for each one of the integrator means (31, 32, 33, ..., 39) and the starting points of the integrating intervals are substantially evenly distributed over the carrier period of the radio frequency input signal (1).
  5. 8
    The mixer according to any of the preceding claims, characterized in that the switching means (21, 22, 23, ..., 29) are analog switches or discrete transistors, and the switch controller (10) is a digital ring counter, or the switching means (21, 22, 23, ..., 29) are implemented by an analog multiplexer and the switch controller (101) is a binary counter driving the multiplexer through its selection inputs.
  6. 9
    The mixer according to any of the preceding claims, characterized in that the integrator means (31, 32, 33, ..., 39) are passive resistor-capacitor integrators or active integrators based on operational amplifiers.
Independent claims6