Patent ID: 6069531
Filing Date: 2000-05-30
Classification: H03F

Abstract:
A method for controlling amplitude and phase of an output signal S comprising the steps of:splitting the output signal S(out) into output signals S(a) and S(b);saturating the output signal S(a) to produce a saturated output signal S(a);adjusting the amplitude and phase of the output signal S(b) to produce an adjusted output signal S(b), wherein the amplitude and phase of the output signal are initially adjusted to substantially match the amplitude and phase of an input signal S(in);inputting the adjusted output signal S(b) to a log detector to produce a saturated adjusted output signal S(b) and a first signal S(log) indicating the amplitude of the adjusted output signal S(b);mixing the saturated adjusted output signal S(b) with the saturated output signal S(a) to produce a first mixed signal;inputting the input signal S(in) to the log detector to produce a saturated input signal S(in) and a second signal S(log) indicating the amplitude of the input signal S(in);mixing the saturated input signal S(in) with the saturated output signal S(a) to produce a second mixed signal;determining a phase difference between the adjusted output signal S(b) and the input signal S(in) using the first and second mixed signals; anddetermining an amplitude difference between the adjusted output signal S(b) and the input signal S(in) using the first and second signals S(log).