A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage
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概要
- 論文の詳細を見る
This paper presents a practical implementation scheme of the variable gain amplifier (VGA) using a Cds photo coupler (Cds PC) as a variable resister at the feedback loop. The fundamental design policies of IF amplifier stage in super-heterodyne receiver were described. We demonstrated the VGA's experimental results. The results indicated the excellent IIP3 of +25dBm achieved by a gain of 15dB, and the reasonable thermal stability and variable gain range. Third-order intermodulation distortion (IMD3) comparison between the proposed VGA and conventional PIN diode attenuation type VGA was evaluated and the result indicated that the proposed VGA surpassed the PTN VGA. The proposed VGA was practically fabricated in 455kHz IF amplifier stage for an airborne VHP communication receiver in order to improve the large signal handling capability to eliminate numerous interferences resulting from the collocated airborne VHP communication systems on the aircraft.
- 社団法人電子情報通信学会の論文
- 2003-02-01
著者
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SHIMAMOTO Shigeru
Graduate School of Global Information and Telecommunication Studies, Waseda University
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Tsuda Yoshio
Graduate School Of Global Information And Telecommunication Studies Waseda University
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Shimamoto Shigeru
Graduate School Of Global Information And Telecommunication Studies Waseda University:(present Addre
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Shimamoto Shigeru
Graduate Scholl Of Global Information And Telecommunication Studies Waseda University
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