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PIER PIER B PIER C PIER M PIER Letters
2010-06-12
Bandwidth Enhancement of an Analog Feedback Amplifier by Employing a Negative Group Delay Circuit
By
Heungjae Choi,

    Dr. Heungjae Choi

    School of Engineering

    Cardiff University

    UK

    Homepage

Yongchae Jeong,

    Prof. Yongchae Jeong

    Division of Electronics and Information Engineering

    Chonbuk National University

    South Korea

    Homepage

Chul Dong Kim,

    Dr. Chul Dong Kim

    Sewon Teletech, Inc.

    South Korea

    Homepage

James Stevenson Kenney

    Dr. James Stevenson Kenney

    Georgia Institute of Technology

    Homepage

Progress In Electromagnetics Research, Vol. 105, 253-272, 2010
doi:10.2528/PIER10041808
Abstract
We will demonstrate an alternative topology to greatly increase the operating bandwidth of an analog RF feedback power amplifier. A limited operating bandwidth due to the group delay mismatch of a feedback loop discouraged the use of an RF feedback technique in spite of its powerful linearization performance and great tolerance capability. By introducing a negative group delay circuit (NGDC) in the feedback loop, group delay match condition could be satisfied. With the fabricated 2-stage distributed element negative group delay circuit with a 30MHz of bandwidth and a -9 ns of group delay for a wideband code division multiple access (WCDMA) downlink band, the proposed feedback amplifier with the proposed topology experimentally achieved an adjacent channel leakage ratio of -53.2 dBc with a cancellation bandwidth of over 50 MHz.
Citation
Heungjae Choi, Yongchae Jeong, Chul Dong Kim, and James Stevenson Kenney, "Bandwidth Enhancement of an Analog Feedback Amplifier by Employing a Negative Group Delay Circuit," Progress In Electromagnetics Research, Vol. 105, 253-272, 2010.
doi:10.2528/PIER10041808
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