PLL circuit and semiconductor integrated device

Details PLL circuit and semiconductor integrated device PLL circuit and semiconductor integrated device

2008-07-30

2010-02-09

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S158000, C327S147000

Reexamination Certificate

active

07659760

ABSTRACT:
A charge pump circuit comprises two MOS transistors serially connected between a power supply voltage VDD and ground, a switch SW0, four switches SW1through SW4, four capacitors C1through C4, and four switches SW5through SW8. If a control voltage Vcntl is to be varied, a specific switch SW of the switches SW1through SW4is turned on such that a specific capacitor is charged to the power supply voltage VDD. Then, a specific switch SW of the switches SW5through SW8is turned on to transfer the electric charge stored in the capacitor to the capacitor of a low-pass filter and thereby the control voltage is controlled at a desired value.

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