A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage

Yoshio TSUDA; Shigeru SHIMAMOTO

A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage

Yoshio TSUDA, Shigeru SHIMAMOTO

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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 superheterodyne receiver were described. We demonstrated the VGA's experimental results. The results indicated the excellent IIP3 of +25 dBm achieved by a gain of 15 dB, 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 PIN VGA. The proposed VGA was practically fabricated in 455 kHz IF amplifier stage for an airborne VHF communication receiver in order to improve the large signal handling capability to eliminate numerous interferences resulting from the collocated airborne VHF communication systems on the aircraft.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E86-A No.2 pp.280-287

Publication Date: 2003/02/01

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Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)

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Yoshio TSUDA, Shigeru SHIMAMOTO, "A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage" in IEICE TRANSACTIONS on Fundamentals, vol. E86-A, no. 2, pp. 280-287, February 2003, doi: .
Abstract: 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 superheterodyne receiver were described. We demonstrated the VGA's experimental results. The results indicated the excellent IIP3 of +25 dBm achieved by a gain of 15 dB, 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 PIN VGA. The proposed VGA was practically fabricated in 455 kHz IF amplifier stage for an airborne VHF communication receiver in order to improve the large signal handling capability to eliminate numerous interferences resulting from the collocated airborne VHF communication systems on the aircraft.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e86-a_2_280/_p

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@ARTICLE{e86-a_2_280,
author={Yoshio TSUDA, Shigeru SHIMAMOTO, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage},
year={2003},
volume={E86-A},
number={2},
pages={280-287},
abstract={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 superheterodyne receiver were described. We demonstrated the VGA's experimental results. The results indicated the excellent IIP3 of +25 dBm achieved by a gain of 15 dB, 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 PIN VGA. The proposed VGA was practically fabricated in 455 kHz IF amplifier stage for an airborne VHF communication receiver in order to improve the large signal handling capability to eliminate numerous interferences resulting from the collocated airborne VHF communication systems on the aircraft.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - A Variable Gain Amplifier Using a Photo Coupler for a Low Frequency IF Amplifier Stage
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 280
EP - 287
AU - Yoshio TSUDA
AU - Shigeru SHIMAMOTO
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E86-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2003
AB - 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 superheterodyne receiver were described. We demonstrated the VGA's experimental results. The results indicated the excellent IIP3 of +25 dBm achieved by a gain of 15 dB, 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 PIN VGA. The proposed VGA was practically fabricated in 455 kHz IF amplifier stage for an airborne VHF communication receiver in order to improve the large signal handling capability to eliminate numerous interferences resulting from the collocated airborne VHF communication systems on the aircraft.
ER -