Switched capacitor circuit capable of minimizing clock...

Details Switched capacitor circuit capable of minimizing clock... Switched capacitor circuit capable of minimizing clock...

2005-12-13

2005-12-13

Nu Ton, My-Trang (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

C331S03600C

Reexamination Certificate

active

06975156

ABSTRACT:
A first switch element selectively connects a first node being connected to a capacitor to a second node according to a first control signal. A precharge circuit is connected to the first node for precharging the first node to a precharge voltage for a predetermined time period when the switched capacitor circuit is switched off. The precharge circuit includes a second switch element for selectively connecting a third node to the first node according to a second control signal; a precharge switch element for selectively connecting the precharge voltage to the third node according to the first control signal; and a delay unit for delaying the first control signal to generate the second control signal. In this way, the clock feedthrough effect is minimized and the capacitance of a varactor formed by the first switch element in the off-state is stabilized during the VCO locking period.

REFERENCES:
patent: 5656975 (1997-08-01), Imura
patent: 6121831 (2000-09-01), Mack
patent: 6226506 (2001-05-01), Welland et al.
patent: 6393070 (2002-05-01), Reber
patent: 6577135 (2003-06-01), Matthews et al.
patent: 6628164 (2003-09-01), Ramesh et al.

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