Phase interpolator

A phase interpolator receiving a first signal having an oscillation frequency and providing a second signal having said oscillation frequency and being phase-shifted with respect to the first signal which depends on a third signal, the interpolator comprising:

• a variable phase-shifter circuit receiving the first signal and providing the second signal, the phase-shifter circuit comprising an astable multivibrator circuit having a first branch and a second branch arranged in parallel between first and second supply terminals, and means capable of providing, in each of the first and second branches, a first current controlled by a fourth signal (Is), the means comprising a first current source capable of providing a second constant current, and wherein the fourth signal is a third variable current which adds to the second current, which results in a variation of a free oscillation frequency (Fo);
• a phase comparator capable of receiving the first and second signals and of providing a fifth signal representative of said phase shift;
• and
• a unit capable of providing the fourth signal, which depends on the third and fifth signals.