Triple-input relaxation oscillator with differential...

Oscillators – Relaxation oscillators

Reexamination Certificate

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C331S111000, C331S11300A, C331S144000, C331S17700V

Reexamination Certificate

active

07348860

ABSTRACT:
There are provided relaxation oscillators and methods for controlling the same. A relaxation oscillator includes a load device, a switching device, a fine-tuning varactor, and a current source. The load device is configured to provide a variable oscillator output based on a variable input reference voltage. The switching device is connected in signal communication with the load device and is configured to become active and inactive based on the variable oscillator output. The fine-tuning varactor is connected in signal communication with the switching device and is configured to provide fine-tuning of the variable oscillator output when the switching device is active. The current source is connected in signal communication with the switching device and is configured to provide coarse-tuning of the variable oscillator output when the switching device is active.

REFERENCES:
patent: 6377129 (2002-04-01), Rhee et al.
patent: 6545555 (2003-04-01), Justice et al.
patent: 6784755 (2004-08-01), Lin et al.
S.-P. Woyciehowsky and R.N. Nottenburg, “10 GHz LC-tuned VCO with coarse and fine frequency control”, May 22, 1997, Electronic Letters, vol. 33, No. 11, pp. 917-918.
W. Rhee, “A Low Power, Wide Linear-Range CMOS Voltage-Controlled Oscillator”, IEEE ISCAS, May 1998, pp. II-85 to II-88.
J. Kim, et al., A 44GHz differentially tuned VCO with 4GHz tuning range in 0.12um SOI CMOS, ISSCC, Feb. 2005; pp. 416-417 & 607.
Ian A. Young, et al., “A PLL Clock Generator with 5 to 110 MHz of Lock Range for Microprocessors”, IEEE Journal of Solid-State Circuits; vol. 27, No. 11, Nov. 1992; pp. 1599-1607.

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