Patent ID: 7023905

Claim:
A correlation and demodulation circuit for a receiver for signals modulated by a first code of a determined repetition length, said first code defining a source transmitting said signals, said circuit including a correlation stage connected to a control means for configuring said correlation stage in normal operating mode or in test mode, in normal operation said stage receiving intermediate signals corresponding to the modulated signals shaped in a receiver modulated signal receiving means, said intermediate signals being correlated in a correlator control loop of said correlation stage with a replica of the first code supplied by a code generator, wherein in test phase, said code generator is adapted via said control means to generate a replica of a second repetition code shorter than the first code for correlation operations with intermediate test signals modulated by the second code of shorter repetition length than the first code and supplied to the correlation stage so as to perform a test representative of the correlation stage in closed loop operation more quickly than with signals modulated by the first code.