Oscillators – Ring oscillators
Patent
1995-05-31
1996-09-24
Grimm, Siegfried H.
Oscillators
Ring oscillators
331 34, 331177R, 327278, 327280, 327281, H03B 502
Patent
active
055594760
ABSTRACT:
A VCO includes a ring oscillator formed by connecting a plurality of voltage controlled inverting delay cells together, and a plurality of transistors for providing control voltages to the plurality of voltage controlled inverting delay cells. Preferably, each transistor has a drain connected to a reference voltage, and a source connected to a voltage controlled inverting delay cell paired to that transistor. Consequently, each transistor acts as a source-follower so that it provides a control voltage to its corresponding voltage controlled inverting delay cell which follows a control voltage driving its gate, thereby isolating the control voltage provided to its corresponding voltage controlled inverting delay cell from power supply noise.
REFERENCES:
patent: 4710726 (1987-12-01), Czarnul
patent: 4988960 (1991-01-01), Tomisawa
patent: 5272453 (1993-12-01), Traynor et al.
patent: 5298870 (1994-03-01), Cytera et al.
Young et al., "A PLL Clock Generator with 5 to 110 Mhz of Lock Range for Microprocessors," IEEE Journal of Solid-State Circuits, vol. 27, No. 11, (Nov. 1992) pp. 1599-1607.
Du He
Zhang Zhongxuan
Cirrus Logic Inc.
Grimm Siegfried H.
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