Voltage controlled oscillator circuit, phase-locked loop...

Details Voltage controlled oscillator circuit, phase-locked loop... Voltage controlled oscillator circuit, phase-locked loop...

Filed on

2006-08-04

Date issued

2008-12-16

Examiner

Lee, Benny (Department: 2817)

Patent Class

Oscillators

SubClass

Ring oscillators

Other Related Categories

C331S034000, C331S17700V, C331S186000

Type

Reexamination Certificate

Status

active

Patent number

07466208

Description

ABSTRACT:
A VCO circuit includes: a control portion to which a first voltage is inputted and from which a second voltage corresponding to the first voltage is outputted; a current source portion to which the second voltage is inputted and from which a current corresponding to the second voltage is outputted; and an oscillator circuit to which the current is inputted and from which a signal with a frequency in accordance with the current is outputted. The control portion includes an adjusting circuit which changes the second voltage in conjunction with fluctuation of a power supply voltage. Accordingly, fluctuation of the frequency Fo of an output signal of the VCO circuit can be suppressed even when the power supply voltage of the VCO circuit fluctuates.

REFERENCES:
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patent: 6563387 (2003-05-01), Hirano et al.
patent: 7023283 (2006-04-01), Kawasumi et al.
patent: 2003/0076180 (2003-04-01), Murakami
patent: 2005/0088247 (2005-04-01), Yasui
patent: 2001-024485 (2001-01-01), None
patent: 2001-251186 (2001-09-01), None
patent: 2005-130092 (2005-05-01), None
International Search Report (Application No. PCT/JP2006/315355) Dated Aug. 29, 2006.
Written Opinion (Application No. PCT/JP2006/315355) Dated Aug. 29, 2006.

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