Ring oscillator for use in parallel sampling of high speed data

Details Ring oscillator for use in parallel sampling of high speed data Ring oscillator for use in parallel sampling of high speed data

2007-02-27

2007-02-27

Kinkead, Arnold (Department: 2817)

Oscillators

Ring oscillators

C331S17700V, C331S034000, C331S074000, C375S376000, C327S156000, C327S158000, C327S159000

Reexamination Certificate

active

10303422

ABSTRACT:
A ring oscillator has multiple stages that are independently adjustable. The delay is controlled using digital signals supplied to the stages. Each stage may receive two digital signals to control the delay with outputs of the particular stage controlling which of the two digital signals is used to control the delay through the stage at any particular time. The stages of the ring oscillator may be biased towards either supplying a faster or slower output signal. Each stage of the ring oscillator includes a tail node having a gate of a first transistor coupled to a digital control signal that adjusts a delay of the ring oscillator stage by turning on or off the transistor and a second transistor having a gate input coupled to a first or second voltage. A first plurality of the ring oscillator stages have the second transistor tied to the first voltage causing the second transistor to be on and a second plurality of the oscillator stages being tied to the second voltage causing the second transistor to be off, thus biasing the stage towards either being faster or slower, respectively.

REFERENCES:
patent: 6411669 (2002-06-01), Kim
patent: 6650190 (2003-11-01), Jordan et al.
patent: 6901126 (2005-05-01), Gu
Gray, C. Thomas, et al., “A Sampling Technique and Its CMOS Implementation with 1 Gb/s Bandwidth and 25 ps Resolution,” IEEE Journal of Solid-State Circuits, vol. 29, No. 3, Mar. 1994, pp. 340-349.

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