Phase-locked loop and compound MOS capacitor thereof

Details Phase-locked loop and compound MOS capacitor thereof Phase-locked loop and compound MOS capacitor thereof

2007-08-06

2009-10-27

Lam, Tuan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S558000, C327S263000, C327S264000, C331S017000

Reexamination Certificate

active

07609108

ABSTRACT:
Compound MOS capacitors and phase-locked loop with the compound MOS capacitors are disclosed. In the phase-locked loop, the compound MOS capacitors of the loop filter are HV (high voltage) devices, and the voltage control oscillator is a LV (low voltage) device. The compound MOS capacitor comprises a HV PMOS capacitor having a base coupled to a source terminal of a low voltage source and a HV NMOS capacitor having a base coupled to a ground terminal of the low voltage source. The gates of the HV PMOS capacitor and the HV NMOS capacitor are connected together to receive a control voltage. The capacitance of the compound MOS capacitor is near constant in any control voltage.

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patent: 2002/0149429 (2002-10-01), Sander
patent: 2004/0232999 (2004-11-01), Kim

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