Voltage controlled oscillator and phase locked loop circuit...

Details Voltage controlled oscillator and phase locked loop circuit... Voltage controlled oscillator and phase locked loop circuit...

2007-09-18

2007-09-18

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C327S158000

Reexamination Certificate

active

10998964

ABSTRACT:
A voltage controlled oscillator and a phase locked loop circuit having the same reduce power consumption by using charges leaked into a ground voltage terminal for an output driving operation with characteristics of both output terminals having different phases in a unit delay cell. The voltage controlled oscillator includes a plurality of unit delay cells connected serially. Each unit delay cell comprises a differential amplification unit and an output driving unit. The differential amplification unit compares a plurality of input voltages having different phases and amplifies the comparison result. The output driving unit, which is connected to both output terminals of the differential amplification units, drives an output voltage of another output terminal with a potential of one of both output terminals.

REFERENCES:
patent: 4965468 (1990-10-01), Nicollini et al.
patent: 2001/0002115 (2001-05-01), Hwang et al.
patent: 2003/0119466 (2003-06-01), Goldman
patent: 2004/0263227 (2004-12-01), Baker et al.
patent: 2005/0253659 (2005-11-01), Favrat et al.
patent: 100244517 (1999-11-01), None

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