Patent ID: 6879643

Claim:
A process for controlling a phase shift between four signals mutually in phase quadrature comprising: generating at least one first base signal, and at least one second base signal in quadrature with respect to the at least one first base signal and having a quadrature error with respect to the at least one first base signal; generating a first pair of signals delayed by a first adjustable delay, the first pair of signals comprising a first delayed signal delayed with respect to the at least one first base signal and a second delayed signal delayed in phase opposition with respect to the first delayed signal; generating a second pair of signals delayed by a second adjustable delay, the second pair of signals comprising a third delayed signal delayed with respect to the at least one second base signal and a fourth delayed signal delayed in phase opposition with respect to the third delayed signal; and adjusting a value of each of the first and second adjustable delays using first and second differential signals arising from a mixing of the first and second pairs of delayed signals to increase the value of one of the first and second adjustable delays and to decrease the value of the other one of the first and second adjustable delays to obtain the four delayed signals mutually in phase quadrature independently of the quadrature error.