Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-09-26
1999-12-07
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327198, 327546, H01J 1982
Patent
active
059990392
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.
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"Transistor Filter for Switching Regulator", IBM Technical Disclosure Bulletin, vol. 24, No. 2, Jul. 1981, New York, p. 890 XP-002056516.
Draper Donald A.
Holst John Christian
Advanced Micro Devices , Inc.
Koestner Ken J.
Nguyen Hai L.
Wells Kenneth B.
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