Receiving amplifier

受信増幅装置

Abstract

PROBLEM TO BE SOLVED: To reduce the power comsumption of the device and to suppress heat generation to improve the reliability. SOLUTION: Bias currents I1, I2, and I3 are applied to amplification parts 3, 4, and 5, and an input signal S1 received through an antenna 1 and a band filter 2 is amplified. A reception electric field detection part 6 detects the level of the input signal S1 to output data on showing the reception electric field level. Optimum values D2 and D3 of bias currents I2 and 13 of amplification parts 4 and 5 which can suppress the intermodulation distortion within an allowable value to realize a low power consumption are preliminarily stored in a bias storage part 7 correspondingly to the reception electric field level. A bias control part 8 receives data D1 showing the reception electric field level to read out pertinent optimum bias current values D2 and D3 from the bias storage part 7 and sends them to bias generation parts 9 and 10 respectively. Bias generation parts 9 and 10 generate bias currents 12 and 13 based on optimum current values D2 and D3 and supply them to amplification parts 4 and 5 respectively. COPYRIGHT: (C)1997,JPO
(57)【要約】 【課題】装置の低消費電力化を図ると共に、発熱を抑え て信頼性を高める。 【解決手段】増幅部3,4,5は、バイアス電流I1, I2,I3をそれぞれ印加され、アンテナ1および帯域 フィルタ2を介して受信した入力信号S1を増幅する。 受信電界検出部6は、入力信号S1のレベルを検出して 受信電界レベルを示すデータD1を出力する。バイアス 記憶部7は、相互変調歪を許容値内に抑えて低消費電力 を実現できる増幅部4,5のバイアス電流I2,I3の 最適値D2,D3を受信電界レベルに対応して予め記憶 している。バイアス制御部8は、受信電界レベルを示す データD1を受けてバイアス記憶部7から該当する最適 バイアス電流値D2,D3をそれぞれ読出し、バイアス 発生部9,10へそれぞれ送出する。バイアス発生部 9,10は、最適電流値D2,D3に基づきバイアス電 流I2,I3をそれぞれ発生し、増幅部4,5へそれぞ れ供給する。

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