Receiver circuit and radio communication terminal apparatus

Details Receiver circuit and radio communication terminal apparatus Receiver circuit and radio communication terminal apparatus

2007-05-22

2007-05-22

Orgad, Edan (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S296000, C455S326000, C455S251100, C375S319000, C375S147000

Reexamination Certificate

active

10509889

ABSTRACT:
There are provided, as a low noise amplifier (70) a low noise amplifier (71) with a low gain and a low noise amplifier (72) with a high gain, selectively operable under control of a bias current, and an output from the low noise amplifier (72) and a quadrature demodulator (80) are connected with a serial capacitance (73) and also an output from the low noise amplifier (71) and the quadrature demodulator (80) are serially connected. A control section (66) controls a reception circuit so that the low noise amplifier (71) operates when a reception signal level is high and the low noise amplifier (72) operates when the reception signal level is low. When the low noise amplifier (72) operates, a DC bias current thereof is made flow separately from a DC bias current of the quadrature demodulator (80), and, when the low noise amplifier (71) operates, a DC bias current thereof is shared with the quadrature demodulator.

REFERENCES:
patent: 5724653 (1998-03-01), Baker et al.
patent: 6073002 (2000-06-01), Peterson
patent: 6757340 (2004-06-01), Jakobsson
patent: 6987966 (2006-01-01), Wu et al.
patent: 2002/0094788 (2002-07-01), Hayashi et al.
patent: 2004/0097212 (2004-05-01), Matsumoto et al.
patent: 2004/0203472 (2004-10-01), Chien
patent: 2002-335182 (2002-11-01), None
patent: 2001/95485 (2001-12-01), None

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