Active power supply filter

Details Active power supply filter Active power supply filter

1999-09-07

2000-10-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327532, 327399, H01J 1982

Patent

active

061278807

ABSTRACT:
An active power supply filter effectively eliminates power supply noise using a resistive element and a capacitive element coupled at a node, and a switch with a control terminal controlled by the node. The active power supply filter is suitable for high frequency operation of a voltage-controlled oscillator (VCO) in a phase-locked loop (PLL) of a high-speed microprocessor. The active power supply filter removes VCO noise that would otherwise create jitter that reduces the effective clock cycle of the microprocessor. The active power supply filter is similarly useful in applications other than VCOs, PLLs, and microprocessors in which removal of substantial amounts of noise from the power supply is useful.

REFERENCES:
patent: 3870905 (1975-03-01), Chikazawa
patent: 4591745 (1986-05-01), Shen
patent: 5391996 (1995-02-01), Marz
patent: 5467039 (1995-11-01), Bae
patent: 5565811 (1996-10-01), Park et al.
patent: 5686848 (1997-11-01), Mes et al.
patent: 5828251 (1998-10-01), Freyman et al.
patent: 5999039 (1999-12-01), Holst et al.

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