High speed current/voltage controlled ring oscillator circuit

Details High speed current/voltage controlled ring oscillator circuit High speed current/voltage controlled ring oscillator circuit

1992-07-29

1994-04-05

Grimm, Sigfried H.

Oscillators

Ring oscillators

307602, 307603, 307606, 331108A, 331108B, 331177R, H03B 502, H03B 524

Patent

active

053008987

ABSTRACT:
A differential inverter such as may be used in an oscillator circuit. The differential inverter is connected between first and second current sources. The differential inverter includes first and second single signal CMOS inverters connected in parallel between the first and second controlled current sources. Each of the current sources is a MOS transistor. A bias circuit is connected to the control gates of the MOS transistors and provides bias signals thereto, the bias circuit includes a variable current source with bias signals being generated in response to the current flow in the variable current source.

REFERENCES:
patent: 4876519 (1989-10-01), Davis
patent: 5012142 (1991-04-01), Sonntag
Johnson et al, IEEE Journal of Solid-State Circuits, pp. 1218-1219, Oct. 1988 "A Variable Delay Line PLL for CPU-Coprocessor Synchronization".
Kim, "High-Speed Clock Recovery in VLSI Using Hybrid Analog/Digital Techniques", Jun. 6, 1989, p. 49, Electronics Research Laboratory, College of Engineering, University of California, Berkley.

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