Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-02-23
2010-10-12
Phu, Sanh D (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
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.
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Katsube Yusaku
Yamamoto Akio
Antonelli, Terry Stout & Kraus, LLP.
Phu Sanh D
Renesas Technology Corp.
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