Voltage-controlled oscillator circuit and PLL circuit

Details Voltage-controlled oscillator circuit and PLL circuit Voltage-controlled oscillator circuit and PLL circuit

2006-07-07

2008-07-01

Pascal, Robert J. (Department: 2817)

Oscillators

Ring oscillators

Reexamination Certificate

active

07394325

ABSTRACT:
A differential type voltage-controlled oscillator circuit including: a plurality of VCO cells each having one pair of switching elements, the switching elements having one terminal side connected to a voltage source via a load and another terminal side connected to a common current source via a common node, the switching elements being supplied with differential signals, the plurality of VCO cells outputting differential signals different in phase from the differential signals; and a vibration canceling section connecting the plurality of VCO cells such that vibration at each node is cancelled.

REFERENCES:
patent: 6650191 (2003-11-01), Branch et al.
patent: 6653908 (2003-11-01), Jones
patent: 2002/0049936 (2002-04-01), Gutnik et al.
patent: 09214299 (1997-08-01), None
patent: 2001-326560 (2001-11-01), None
Ali Hajimiri, et al., “General Theory of Phase Noise in Electrical Oscillators,”, IEEE Journal of Solid-State Circuits, vol. 33, No. 2, Feb. 1998.

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