Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique

Kenichi HORIGUCHI; Satoru ISHIZAKA; Masatoshi NAKAYAMA; Ryoji HAYASHI; Yoji ISOTA; Tadashi TAKAGI

doi:10.1093/ietele/e90-c.9.1670

Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique

Kenichi HORIGUCHI, Satoru ISHIZAKA, Masatoshi NAKAYAMA, Ryoji HAYASHI, Yoji ISOTA, Tadashi TAKAGI

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This paper proposes a design method of a Doherty amplifier, which can determine the most efficient backed-off point of the amplifier by adjusting a load modulation parameter. The parameter is defined through the design of output transmission line of a carrier and a peak amplifier using a virtual open stub technique. This paper describes the design results using the technique to optimize efficiency of a Doherty amplifier for an orthogonal frequency division multiplexing (OFDM) signal, and parameter adjustment for a linearized Doherty amplifier using an adaptive digital predistortion (ADPD). Applying this method, the developed 250 W ADPD Doherty amplifier has achieved drain efficiency of 43.4% and intermodulation (IM) distortion of -48.3 dBc with output power of 44.1 dBm (10.1 dB output backed-off) at 563 MHz using an OFDM signal for integrated services digital broadcasting-terrestrial (ISDB-T).

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.9 pp.1670-1677

Publication Date: 2007/09/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.9.1670

Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)

Category: Active Devices/Circuits

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Kenichi HORIGUCHI, Satoru ISHIZAKA, Masatoshi NAKAYAMA, Ryoji HAYASHI, Yoji ISOTA, Tadashi TAKAGI, "Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 9, pp. 1670-1677, September 2007, doi: 10.1093/ietele/e90-c.9.1670.
Abstract: This paper proposes a design method of a Doherty amplifier, which can determine the most efficient backed-off point of the amplifier by adjusting a load modulation parameter. The parameter is defined through the design of output transmission line of a carrier and a peak amplifier using a virtual open stub technique. This paper describes the design results using the technique to optimize efficiency of a Doherty amplifier for an orthogonal frequency division multiplexing (OFDM) signal, and parameter adjustment for a linearized Doherty amplifier using an adaptive digital predistortion (ADPD). Applying this method, the developed 250 W ADPD Doherty amplifier has achieved drain efficiency of 43.4% and intermodulation (IM) distortion of -48.3 dBc with output power of 44.1 dBm (10.1 dB output backed-off) at 563 MHz using an OFDM signal for integrated services digital broadcasting-terrestrial (ISDB-T).
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.9.1670/_p

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@ARTICLE{e90-c_9_1670,
author={Kenichi HORIGUCHI, Satoru ISHIZAKA, Masatoshi NAKAYAMA, Ryoji HAYASHI, Yoji ISOTA, Tadashi TAKAGI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique},
year={2007},
volume={E90-C},
number={9},
pages={1670-1677},
abstract={This paper proposes a design method of a Doherty amplifier, which can determine the most efficient backed-off point of the amplifier by adjusting a load modulation parameter. The parameter is defined through the design of output transmission line of a carrier and a peak amplifier using a virtual open stub technique. This paper describes the design results using the technique to optimize efficiency of a Doherty amplifier for an orthogonal frequency division multiplexing (OFDM) signal, and parameter adjustment for a linearized Doherty amplifier using an adaptive digital predistortion (ADPD). Applying this method, the developed 250 W ADPD Doherty amplifier has achieved drain efficiency of 43.4% and intermodulation (IM) distortion of -48.3 dBc with output power of 44.1 dBm (10.1 dB output backed-off) at 563 MHz using an OFDM signal for integrated services digital broadcasting-terrestrial (ISDB-T).},
keywords={},
doi={10.1093/ietele/e90-c.9.1670},
ISSN={1745-1353},
month={September},}

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TY - JOUR
TI - Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique
T2 - IEICE TRANSACTIONS on Electronics
SP - 1670
EP - 1677
AU - Kenichi HORIGUCHI
AU - Satoru ISHIZAKA
AU - Masatoshi NAKAYAMA
AU - Ryoji HAYASHI
AU - Yoji ISOTA
AU - Tadashi TAKAGI
PY - 2007
DO - 10.1093/ietele/e90-c.9.1670
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2007
AB - This paper proposes a design method of a Doherty amplifier, which can determine the most efficient backed-off point of the amplifier by adjusting a load modulation parameter. The parameter is defined through the design of output transmission line of a carrier and a peak amplifier using a virtual open stub technique. This paper describes the design results using the technique to optimize efficiency of a Doherty amplifier for an orthogonal frequency division multiplexing (OFDM) signal, and parameter adjustment for a linearized Doherty amplifier using an adaptive digital predistortion (ADPD). Applying this method, the developed 250 W ADPD Doherty amplifier has achieved drain efficiency of 43.4% and intermodulation (IM) distortion of -48.3 dBc with output power of 44.1 dBm (10.1 dB output backed-off) at 563 MHz using an OFDM signal for integrated services digital broadcasting-terrestrial (ISDB-T).
ER -