Title:
受信回路及び無線通信端末装置
Document Type and Number:
Japanese Patent JP4523758
Kind Code:
B2
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.
Inventors:
Kotaro Takagi
Application Number:
JP2003033258A
Publication Date:
August 11, 2010
Filing Date:
February 12, 2003
Export Citation:
Assignee:
Sony Ericsson Mobile Communications Inc.
International Classes:
H03G3/10; H04B1/10; H04B1/30
Domestic Patent References:
| JP2002335182A |
Foreign References:
| WO2001095485A2 |
Attorney, Agent or Firm:
Mutsuhiko Yamano