| 摘要 |
A phase comparison circuit for comparing first and second pulse trains applied to first and second inputs (1 and 2) respectively, comprises a sawtooth signal generator (11,3) which is phase-locked to the first pulse train (VA) by means of a frequency control loop comprising a first sampling circuit (4,5) and an amplifier (12). The output signal of the sawtooth generator is sampled when each pulse occurs in the second pulse train (VB) by means of a second sampling circuit (8,9). In order that a phase difference of zero between the two pulse trains can be accurately determined, whatever their actual repetition frequency, the output signal of the arrangement is formed by means of a differential amplifier (10) as the difference between the output signals of the two sampling circuits. |
