| 摘要 |
A charge pump capable of responding to a high frequency contains a first constant current source 1 connected between a power supply Vcc and an output terminal Out; and first and second NPN transistors 2 and 3 between the output terminal Out and a ground with their collectors connected to the output terminal Out. A first signal output from a phase comparator is input to a base of the first NPN transistor 2 , and a second signal output from the phase comparator is input to a base of the second NPN transistor 3.
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