Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1996-01-02
1997-02-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327156, 327 3, 327147, 327148, 327 40, 327113, 327103, 327237, 331 10, 331 17, H03L 700
Patent
active
056002726
ABSTRACT:
A damping circuit is described which includes a phase-and-frequency detector, a charge pump, a voltage-current oscillator and a capacitor. The phase-and-frequency detector generates UP and DOWN signals representative of a difference in phase between a pair of digital input signals. The charge pump varies an amount of charge carried within the capacitor in accordance with the UP and DOWN signals. The voltage controlled oscillator generates an output signal having a frequency controlled by both a voltage provided by the capacitor and by the UP and DOWN signals directly received from the phase-and-frequency detector. No analog damping resistor is required. Rather, the damping circuit is an digital circuit which generates adequate phase and frequency damping without a damping resistor. Damping is achieved which is substantially unaffected by process parameters and operating and ambient parameters. Method embodiments of the invention are also described.
REFERENCES:
patent: 5012494 (1991-04-01), Lai et al.
patent: 5126692 (1992-06-01), Shearer et al.
patent: 5144156 (1992-09-01), Kawasaki
patent: 5165054 (1992-11-01), Platt et al.
Callahan Timothy P.
Le Dinh T.
Sun Microsystems Inc.
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