Correlation and demodulation circuit for a receiver for signals modulated by a specific code

Abstract

The correlation and demodulation circuit () in particular for a pseudo-random code radio-frequency signal receiver () includes a correlation stage () connected to a microprocessor () in particular for configuring the correlation stage in normal operating mode or in test mode. In normal operation the stage receives intermediate signals (IF) corresponding to the radio-frequency signals shaped in means () for receiving the modulated signals from the receiver. The intermediate signals are correlated in a correlator control loop () of said correlation stage () with a replica of the first code supplied by a code generator (). The code generator () is adapted via a microprocessor () to generate a replica of a pseudo-random code of shorter repetition length than the pseudo-random code of the radio-frequency signals. Intermediate test signals (IF) with a reduced pseudo-random code are supplied to the correlation stage () so as to perform a test representative of the correlation stage in closed loop operation more quickly than with conventional intermediate signals.