| 摘要 |
<p>A phase detector comprising a first ramp generator (44) responsive to a reference oscillator (40) input signal for initiating a first ramp waveform, a second ramp generator (54) responsive to a variable frequency oscillator (50) signal input for initiating a second ramp waveform, the first and second ramp generators being coupled respectively to first (46) and second (56) sample and hold circuits, means responsive to the first ramp waveform to actuate the first and second sample and hold circuits, and comparison means (48) for comparing the signal values stored in the first and second hold circuits whereby to provide an output signal indicative of the phase difference between the reference oscillator and variable frequency oscillator input signals.</p> |
