| 摘要 |
A phase-comparison circuit includes (a) a first PNP transistor, (b) a second PNP transistor, (c) a third NPN transistor electrically connected to both a collector of the first PNP transistor and a base of the second PNP transistor, and (d) a constant current source electrically connected to an emitter of the third NPN transistor. The phase comparison circuit compensates for an offset current between a reference current and an output current, and as a result, can properly operate at a low voltage.
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