Frequency tuning and direct current offset canceling circuit...

Details Frequency tuning and direct current offset canceling circuit... Frequency tuning and direct current offset canceling circuit...

2009-11-06

2011-10-04

Mis, David (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C455S307000

Reexamination Certificate

active

08030991

ABSTRACT:
The present invention provides a frequency tuning/DC offset canceling circuit for continuous-time analog filter with time division, the frequency tuning/DC offset canceling circuit including: a frequency tuning/DC offset canceling unit for performing frequency tuning by comparing an output voltage with a reference voltage when a frequency tuning control signal is inputted, and canceling a DC offset after terminating the frequency tuning when a DC offset canceling control signal is inputted; and a control signal generator for generating the frequency tuning control signal and the DC offset canceling control signal based on a reference clock in time division.

REFERENCES:
patent: 2004/0169565 (2004-09-01), Gaggl et al.
patent: 10-2000-0038107 (2000-07-01), None
patent: 1020060119242 (2006-11-01), None
Korean Office Action for Application No. KR 10-2009-0081541 mailed Dec. 20, 2010.

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