Oxide overstress tolerant crystal oscillator

Details Oxide overstress tolerant crystal oscillator Oxide overstress tolerant crystal oscillator

2006-09-29

2008-12-30

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S160000, C331S109000

Reexamination Certificate

active

07471163

ABSTRACT:
An oscillator circuit includes a plurality of transistors that can withstand relatively low gate-to-source and gate-to-drain voltages. The oscillator circuit interfaces with an oscillator that oscillates at a relatively high voltage. The oscillator circuit includes a first set of transistors coupled to an input voltage and an output voltage of the oscillator, the input voltage oscillating in a range exceeding a tolerance voltage level of each transistor of the first set of transistors. The oscillator circuit also includes a second set of transistors to limit a voltage level in the first set of transistors. The oscillator circuit further includes a third set of transistors to provide a constant current path for the second set of transistors, independent of a switching state of each transistor of the first set of transistors.

REFERENCES:
patent: 4821001 (1989-04-01), Hattori
patent: 5208558 (1993-05-01), Shigehara et al.

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