| 摘要 |
A phase-locked system comprises in series connected: a reference generator, a phase modulator, a first phase detector, a first low-pass filter and a control voltage generator, output of which is connected to second inputs of first and second phase detectors, output of is connected to input of second low-pass filter, time constant of the second filter does exceed the time constant of the first low-pass filter, output of the phase modulator is connected to first input of second phase detector through a &pgr;/2 phase changer, in addition, behind second low-pass filter instead of non-linear element with blanking zone a controlled amplifier is incorporated. The said amplifier has a supplementary input for gain regulating according the non-linear low arctg(x). Third low-pass filter is also incorporated. |
