Charge pump for use in a phase-locked loop

Details Charge pump for use in a phase-locked loop Charge pump for use in a phase-locked loop

H - Electricity

03

L

328/28

H03L 7/00 (2006.01)

Patent

CA 1267194

ABSTRACT An improved charge pump for use in a phase-locked loop is disclosed in which there is only one current source, and in which all switching components pass current in the same direction. The charge pump may thus be constructed entirely of NPN transistors, which makes it possible to embody it in a single integrated circuit chip. The pump up and pump down currents inherently have the same magnitude and transient characteristics, thus minimizing steady-state errors.

512108

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