Temperature-compensated ring oscillator

Details Temperature-compensated ring oscillator Temperature-compensated ring oscillator

2010-01-19

2011-12-13

Gannon, Levi (Department: 2817)

Oscillators

Ring oscillators

C331S176000

Reexamination Certificate

active

08076980

ABSTRACT:
A temperature-compensated ring oscillator includes a control signal generator and a voltage controlled oscillator. The control signal generator is configured to generate at least one control signal, and includes at least one first resistor and second resistor. A first temperature coefficient of the first resistor is negative, and a second temperature coefficient of the second resistor is positive. The voltage controlled oscillator receives the control signal, outputs an oscillation signal, and has (2k+1) cascaded inverter units, where k≧1. Each of the inverter units includes a first transistor, a second transistor and an inverter. The first transistor has a drain coupled to a first supply voltage and a gate to receive the control signal. The second transistor has a source to receive a second supply voltage and a gate to receive the control signal. The inverter is coupled between the first and the second transistors.

REFERENCES:
patent: 4549818 (1985-10-01), Nishikubo et al.
patent: 5180995 (1993-01-01), Hayashi et al.
patent: 5499214 (1996-03-01), Mori et al.
patent: 6809603 (2004-10-01), Ho
patent: 7675373 (2010-03-01), Thaller
patent: 7777555 (2010-08-01), Liao et al.

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