Integrated tunable filter for broadband tuner

Details Integrated tunable filter for broadband tuner Integrated tunable filter for broadband tuner

2005-07-05

2005-07-05

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S340000, C327S553000

Reexamination Certificate

active

06915121

ABSTRACT:
A tunable filter circuit includes a first differential pair biased by a first current, a second differential pair biased by a second current, a first capacitor and a second capacitor. The tunable filter circuit of the present invention can be configured as a bandpass filter or a bandstop filter by connecting the input voltage signal to different input nodes of the tunable filter circuit. The tunable filter circuit can be tuned by adjusting the values of the first current and the second current. In an alternate embodiment, frequency tuning is achieved either by switching capacitive loads or changing resistive impedances introduced at the emitter of the differential pairs, which also extends the input voltage range of the filter. This emitter resistance is implemented using MOS switches whose on-resistance can be controlled for a precise tuning within a large frequency range.

REFERENCES:
patent: 4363135 (1982-12-01), Moon
patent: 4843343 (1989-06-01), Pace
patent: 5293514 (1994-03-01), Nakagawara
patent: 5752179 (1998-05-01), Dobrovolny
Randall L. Geiger and Edgar Sanchez-Sinencio, “Active Filter Design Using Operational Transconductance Amplifiers: A Tutorial,” 8192 IEEE Circuits and Devices Magazine 1(1985) Mar., No. 2, pp. 20-32.
E. Sanchez-Sinencio and J. Silva-Martinez, “CMOS Transconductance Amplifiers, Architectures and Active Filters: A Tutorial,” IEE Proc.-Circuits Devices Syst., vol. 147, No. 1, Feb. 2000, pp. 3-12.
International Search Report including written opinion, 11 pages.

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