Miniaturized Millimeter-Wave HMIC Amplifiers Using Capacitively-Coupled Matching Circuits and FETs with Resistive Source-Stubs

Hiromitsu UCHIDA  Hideshi HANJYO  Yasushi ITOH  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.11   pp.2087-2093
Publication Date: 1999/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
millimeter wave,  amplifier,  hybrid circuit,  capacitive coupled-line,  GaAs PHEMT,  

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Miniaturized millimeter-wave HMIC amplifiers have been developed by using capacitively-coupled matching circuits (CCMC) and FETs with resistive source-stubs. CCMC includes FET's parasitic reactances, and is able to reduce the size of a matching circuit in a HMIC amplifier to about 1/3 of a conventional matching circuit using an open-circuited stub for matching and a quarter-wavelength coupled-line for d. c. blocking. The resistive source-stubs, which consist of two open-circuited stubs and a resistor, can improve the gain and stability of FETs at millimeter-wave frequencies. In this paper, design procedures of CCMC and the resistive source-stubs are described, and their usefulness has been confirmed experimentally through measurements of prototype V-band high-power HMIC amplifiers.