Direct down-conversion receiver with...

Details Direct down-conversion receiver with... Direct down-conversion receiver with...

2006-11-21

2006-11-21

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S311000, C455S341000, C330S303000, C333S172000

Reexamination Certificate

active

07139544

ABSTRACT:
A direct-down conversion receiver may include a transconductance-capacitor (GmC) filter to filter undesirable mixing products and provide a filtered baseband-differential signal. The GmC filter may include first and second transconductance-capacitor (GmC) circuits in series and a transconductance-feedback circuit in feedback with the second transconductance-capacitor circuit. The GmC circuits may comprise cross-coupled pairs of transistors to receive a baseband-differential signal and generate a differential output current. The GmC circuits may also comprise MOSCAPs coupled respectively between the differential inputs of the GmC circuit and internal-feedback nodes. In some embodiments, a substantially-constant bias voltage may be maintained across the voltage-dependent capacitors to allow the voltage-dependent capacitors to provide a substantially constant capacitance.

REFERENCES:
patent: 5384501 (1995-01-01), Koyama et al.
patent: 6400218 (2002-06-01), Zocher et al.
patent: 6549074 (2003-04-01), Ugajin et al.
patent: 6990327 (2006-01-01), Zheng et al.
patent: 7002409 (2006-02-01), Aram
patent: 2002/0163384 (2002-11-01), Hasegawa
patent: 2003/0146789 (2003-08-01), Mitteregger
patent: 2004/0120421 (2004-06-01), Filipovic
patent: 2004/0164795 (2004-08-01), Ueno et al.

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