Charge pump phase locked loop with improved power supply...

Details Charge pump phase locked loop with improved power supply... Charge pump phase locked loop with improved power supply...

2005-11-08

2005-11-08

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000, C327S536000

Reexamination Certificate

active

06963233

ABSTRACT:
A phase lock loop circuit (60) has a phase frequency detector (62), a charge pump (64), an active filter (87) and a voltage-controlled oscillator (100). The phase detector generates signals responsive to reference signal FRand VCO output signal FV. A charge pump generates a voltage at the input of a first transmission gate (76) according to the values of the phase detector signals. A predetermined voltage is generated at the input of a second transmission gate (112). When the transmission gates (76, 110) are closed (low impedance) the charge pump may sink or source current to the inverting input of the operational amplifier (86) of the active filter86and the predetermined voltage is applied to the non-inverting input. When the transmission gates are open (high impedance state) the inverting input is electrically isolated from the node and the non-inverting output is isolated from the power supply.

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Patent Abstract of Japan, vol. 017, No. 599 (E-1455), Feb. 11, 1993, & JP 05 183431 A (Victor Co. of Japan Ltd.), Jul. 23, 1993.

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