Calibrated fully differential RC filter

Details Calibrated fully differential RC filter Calibrated fully differential RC filter

2005-06-07

2005-06-07

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S554000, C327S337000

Reexamination Certificate

active

06903602

ABSTRACT:
A calibrated RC filter (4) includes a fully differential calibration circuit (10) and finite state machine (8) for determining processing variations in the resistive and capacitive components of a RC filter (6). The finite state machine controls tunable capacitors (7) in the RC filter (6) according to the results of the calibration. In order to provide a symmetrical coverage range, an asymmetrical correction code is used for the nominal case.

REFERENCES:
patent: 6445331 (2002-09-01), Stegers
patent: 6617908 (2003-09-01), Thomsen et al.
patent: 6670846 (2003-12-01), Yamamoto et al.
patent: 2170969 (1986-08-01), None
“Self-Tuned RC-Active Filters for VLSI”, J.B. Hughes, et al., Electronics Letters, vol. 22, No. 19, Sep. 11, 1986, pp. 993-994, XP001149985.

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