| 摘要 |
Two active load circuits have a current mirror circuit (8-16) each. The outputs of the respective active load circuits are superimposed upon each other through other current mirror circuits, and an output resulting from the superimposition is alternately provided based on rectangular waveform signals which are reversed in phase w.r.t. each other. By smoothing the output, a DC output corresp. to the phase shift of input signal from the rectangular waveform signals is produced. The phase comparator comprises a combination of transistors and diodes which are cascade-connected to each other.
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