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An L-band SiGe HBT differential amplifier with frequency and rejection-level tunable, multiple stopband

Published online by Cambridge University Press:  22 June 2009

Masaki Shirata ,
Toshio Shinohara ,
Minoru Sato  and
Yasushi Itoh
Masaki Shirata
Affiliation:
Department of Electrical and Electronic Engineering, Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa 251-8511Japan. Phone & Fax: +81-466-30-0185.
Toshio Shinohara
Affiliation:
Department of Electrical and Electronic Engineering, Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa 251-8511Japan. Phone & Fax: +81-466-30-0185.
Minoru Sato
Affiliation:
Department of Electrical and Electronic Engineering, Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa 251-8511Japan. Phone & Fax: +81-466-30-0185.
Yasushi Itoh*
Affiliation:
Department of Electrical and Electronic Engineering, Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa 251-8511Japan. Phone & Fax: +81-466-30-0185.
*
Corresponding author: Y. Itoh E-mail: itohy@center.shonan-it.ac.jp
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Abstract

An L-band frequency and rejection-level tunable SiGe HBT differential amplifier with dual stopband is presented. To achieve frequency and rejection-level tunable performance, dual LCR-tank circuit with an active load is incorporated into the design of the series feedback loops of the differential amplifier. The active load consists of a varactor diode represented as a variable C and a common-emitter transistor represented as a variable R. The frequency and rejection level can be tuned independently by controlling a cathode bias voltage of the varactor diode or a base bias voltage of the transistor. The implemented 0.35 μm SiGe HBT amplifier with dual stopband demonstrates a frequency tuning of 0.53–1.16 GHz and a rejection-level variation up to 9.5 dB. The input and output return losses are better than 17.5 and 11 dB over 0.2–1.5 GHz, respectively. The measured P1dB is+3 dBm and IIP3 is 0 dBm with Vcc = 6 V and Ic = 8 mA.

Keywords

Differential amplifierTunableMicrowaveSiGe HBTBandstopMultiple band
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Special Issue 4: European Microwave Week 2008 , August 2009 , pp. 285 - 292
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2009

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