Digitally controlled oscillator

Details Digitally controlled oscillator Digitally controlled oscillator

2009-09-30

2011-10-18

Johnson, Ryan (Department: 2817)

Oscillators

Ring oscillators

C331S17700V

Reexamination Certificate

active

08040196

ABSTRACT:
A digitally controlled oscillator includes a ring oscillator, a parallel resistor bank connected to a first terminal of the ring oscillator and having a resistance that varies according to a digital code, and a serial resistor bank connected to a second terminal of the ring oscillator and having a resistance that varies according to the digital code. A frequency of the ring oscillator linearly varies with a variation in the resistance of the parallel resistor bank and the resistance of the serial resistor bank according to the digital code.

REFERENCES:
patent: 2008/0252387 (2008-10-01), Higashi
patent: 2008/0284529 (2008-11-01), Refeld et al.
patent: 07-074592 (1995-03-01), None
patent: 2000-068787 (2000-03-01), None
patent: 100246341 (1999-06-01), None
patent: 1020070025137 (2007-03-01), None

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