Receiver system

摘要

A receiver circuit includes an input terminal through which an input signal is received. The receiver circuit also includes a first amplifier stage connected via its input to the input terminal of the receiver circuit; and an envelope detector stage that detects the incoming signal maxima to recover the signal envelope, where the detector stage is connected to the output of the first stage.

主权项

1. A receiver system including an input terminal through which an input signal is received, said receiver system further comprising:
a first amplifier stage connected via one of a plurality of inputs to the input terminal of said receiver system and being configured to deliver an amplified signal; an envelope detector stage, connected to an output of the first amplifier stage, that is configured to detect maxima in the amplified signal to recover an envelope of the amplified signal and to deliver a signal; a second comparator stage including a negative input connected to an output of the envelope detector stage and a positive input to receive a reference signal, said second comparator stage being configured to compare the signal delivered at the output of the envelope detector stage to the reference signal to deliver a control signal, and to send the control signal to the first amplifier stage to vary a gain of the first amplifier stage; and a comparator circuit connected via a positive input to the output of the envelope detector stage and via a negative input to the positive input of the second comparator stage, the comparator circuit being configured to compare the output of the envelope detector stage to the reference signal, and to deliver a demodulated output signal based on the comparison, wherein the comparator circuit includes:
a comparator module configured to distinguish between the output signal from the envelope detector stage and the reference signal, anda hysteresis module, wherein the hysteresis module includes two pairs of transistors of a same type each including a first transistor and a second transistor, wherein the transistors of the same pair are connected to earth, a gate of the first transistor of the first pair and a gate of the second transistor of the second pair are connected to each other to form a first connection point, and a gate of the second transistor of the first pair and a gate of the first transistor of the second pair are connected to each other to form a second connection point, wherein drains of the first transistor of the first pair and of the second transistor of the second pair are connected to the comparator module, and the drains of the second transistor of the first pair and of the first transistor of the second pair are respectively connected to the drain of the second transistor of the second pair and to the drain of the first transistor of the first pair, and wherein the hysteresis module further includes a programmable part including two programming transistors each connected via a drain thereof to the sources of the transistors of one of the two pairs of transistors of the hysteresis module, sources of said two programming transistors being connected to earth, and in that the gates of each said programming transistor form a connection point to receive a programming signal.