Variable-path-length voltage-controlled oscillator circuit

Details Variable-path-length voltage-controlled oscillator circuit Variable-path-length voltage-controlled oscillator circuit

1997-08-11

1998-12-08

Mis, David

Oscillators

Ring oscillators

331 1A, 331 34, 331117R, 331179, 327158, 327159, H03B 524, H03L 7099

Patent

active

058476172

ABSTRACT:
A variable-path-length voltage-controlled oscillator circuit is provided. The oscillator circuit has a ring oscillator formed from a series of voltage-controlled inverter stages. The path length (i.e., the number of inverter stages) in the ring is selected based on path length configuration data stored in memory. The selected path length determines the nominal or center frequency of operation of the ring oscillator. The output frequency of the oscillator circuit is voltage-tuned about this center frequency by varying the delay of each inverter stage in the ring oscillator path. Various types of voltage-controlled inverter stages may be used, including current-starved inverter stages, variable-capacitive-load inverter stages, and differential-delay inverter stages. The voltage-controlled oscillator circuit may be used in a phase-locked loop on a programmable logic device for frequency synthesis or to eliminate clock skew.

REFERENCES:
patent: 5349311 (1994-09-01), Mentzer
patent: 5389898 (1995-02-01), Taketoshi et al.
patent: 5418499 (1995-05-01), Nakao
patent: 5477198 (1995-12-01), Anderson et al.
patent: 5559473 (1996-09-01), Anderson et al.
patent: 5629651 (1997-05-01), Mizuno
"Multi-Frequency Zero-Jitter Delay-Locked Loop," A. Efendovich et al., Proceedings of the IEEE 1993 Custom Integrated Circuits Conference, pp. 27.1.1-27.1.4 (1993).
"A 30-ps Jitter, 3.6-.mu.s Locking, 3.3-Volt Digital PLL for CMOS Gate Arrays," U. Ko et al., Proceedings of the IEEE 1993 Custom Integrated Circuits Conference, pp. 23.31-23.3.4 (1993).
"Multifrequency Zero-Jitter Delay-Locked Loop," A. Efendovich et al., IEEE Journal of Solid-State Circuits, vol. 29, No. 1, pp. 67-70 (1994).

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