Receiving circuit

Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination

Reexamination Certificate

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Details

C455S343100, C327S237000, C327S552000, C327S557000, C327S558000

Reexamination Certificate

active

07813710

ABSTRACT:
The present invention is a receiving circuit used for a cellular phone that is reduced in size and can realize low power consumption. In a signal reception circuit that is used in a cellular phone that perform transmission and reception of a plurality of band wireless signals and includes a low-pass filter for removing blockers unnecessary for signal reception, the low-pass filter104is composed of a plurality of filters composed of a plurality of different circuit configurations and having a plurality of different pole positions, switching between a filter for blocker removal and a filter configuration with reduced sensitivity degradation is performed by combining a plurality of filters for each signal reception band, and by performing power-off of an unnecessary filter portion in the filter configuration, power consumption is reduced. By constituting a plurality of different filters using filters mutually complementing their characteristics, a redundant filter configuration can be avoided, so that the area thereof can be suppressed to necessity minimum, and cost can be reduced.

REFERENCES:
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patent: 6057723 (2000-05-01), Yamaji et al.
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patent: 6495998 (2002-12-01), Terreault
patent: 7020186 (2006-03-01), McReynolds et al.
patent: 2004/0042539 (2004-03-01), Vishakhadatta et al.
patent: 05-183342 (1993-07-01), None
patent: 10-200376 (1998-07-01), None
patent: 10-215200 (1998-08-01), None
patent: 2001-186042 (2001-07-01), None
patent: 2004-032390 (2004-01-01), None
patent: 2005-020495 (2005-01-01), None

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