Ultra high frequency ring oscillator with voltage controlled...

Details Ultra high frequency ring oscillator with voltage controlled... Ultra high frequency ring oscillator with voltage controlled...

2006-09-26

2006-09-26

Mis, David (Department: 2817)

Oscillators

Ring oscillators

C331S034000

Reexamination Certificate

active

07113048

ABSTRACT:
A pseudo Set/Reset latch circuit is configured with modified NOR or NAND gates wherein one of the series pull-up devices or pull-down devices is removed. A minimum of three pseudo Set/Reset latches may be coupled as a ring oscillator generating an output and a non-skewed complementary output. Additionally, feed-forward inverting stages may be coupled in parallel with inverting paths in the ring oscillator primary path to further increase the frequency range of the ring oscillator. The pseudo Set/Reset latch circuits and the feed-forward inverting stages may be configured with voltage controlled devices that alter the delay of the stages as a means for varying the frequency of the ring oscillator either by varying the current drive of the circuitry driving the output of the latch stages or by varying the conductance of devices coupling between the latch stages. Feedforward inverting stages may comprise pseudo latches or inverter gates.

REFERENCES:
patent: 6043719 (2000-03-01), Lin et al.
patent: 6965273 (2005-11-01), D'Souza et al.

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