Self-calibrating tunable filter

Details Self-calibrating tunable filter Self-calibrating tunable filter

2006-05-23

2006-05-23

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S307000, C327S553000

Reexamination Certificate

active

07050781

ABSTRACT:
Some embodiments of the present invention include a circuit in a wireless transmitter or other apparatus is automatically calibrated using a calibration circuit to accommodate provide a desired characteristic such as a filter response, where the component values of the filter circuit may vary such as in an integrated circuit. In one embodiment, the calibration circuit is coupled to one or more adjustable capacitors in the filter circuit to select a capacitor value so that the filter circuit exhibits the desired filter response. In one particular embodiment, the adjustable capacitor is charged in an RC circuit for each clock cycle at power up. The value of the adjustable capacitor is changed for each clock cycle until the capacitor charges to a level greater than or equal to predetermined reference voltage. When the capacitor is charged to a predetermined reference voltage, a desired capacitance value is indicated, and the adjustable capacitor is maintained at the desired capacitance value to provide the desired filter output. The calibration circuit causes the circuit to be self-calibrating to the desired characteristic such as a desired filter response. Other embodiments are described and claimed.

REFERENCES:
patent: 3760287 (1973-09-01), Harris
patent: 5914633 (1999-06-01), Comino et al.
patent: 5995817 (1999-11-01), Lubbe et al.
patent: 6181218 (2001-01-01), Clark et al.
patent: 6618579 (2003-09-01), Smith et al.
patent: 6681102 (2004-01-01), Collier et al.
patent: 6747522 (2004-06-01), Pietruszynski et al.

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