Digitally controlled tuner circuit

Details Digitally controlled tuner circuit Digitally controlled tuner circuit

2005-07-19

2005-07-19

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C331S017000

Reexamination Certificate

active

06919759

ABSTRACT:
A digitally controlled tuner circuit for continuous time filters. The digital PLL-based tuner circuit has a digitally controlled oscillator and an open-loop filter. The oscillator has digitally adjusted resistors to allow for digital fine tuning of its time constant and its output frequency. A lock detector detecting the output of the open-loop filter is also part of the tuner circuit.

REFERENCES:
patent: 4812773 (1989-03-01), Yamamoto et al.
patent: 5281931 (1994-01-01), Bailey et al.
patent: 5914633 (1999-06-01), Comino et al.
patent: 6052034 (2000-04-01), Wang et al.
patent: 6262624 (2001-07-01), Tsinker
patent: 6657483 (2003-12-01), Sahu

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