A variable gain amplifier using a photo coupler for a low frequency IF amplifier stage

Yoshio Tsuda, Shigeru Shimamoto

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    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 455kHz 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.

    Original languageEnglish
    Pages (from-to)280-287
    Number of pages8
    JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
    VolumeE86-A
    Issue number2
    Publication statusPublished - 2003 Feb

    Fingerprint

    Intermediate frequency amplifiers
    Coupler
    Low Frequency
    Intermodulation distortion
    Receiver
    Thermal Stability
    Variable gain amplifiers
    Communication systems
    Diodes
    Feedback Loop
    Thermodynamic stability
    Aircraft
    Diode
    Attenuation
    Communication Systems
    Feedback
    Eliminate
    Interference
    Communication

    Keywords

    • Cds photo coupler
    • IF amplifier
    • Intermodulation distortion
    • Superheterodyne receiver
    • Variable gain amplifier

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Hardware and Architecture
    • Information Systems

    Cite this

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    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 455kHz 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 = "Cds photo coupler, IF amplifier, Intermodulation distortion, Superheterodyne receiver, Variable gain amplifier",
    author = "Yoshio Tsuda and Shigeru Shimamoto",
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