Amplifiers – With semiconductor amplifying device – Including distributed parameter-type coupling
Patent
1993-12-01
1995-05-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including distributed parameter-type coupling
330306, H03F 360
Patent
active
054123470
ABSTRACT:
A microwave amplifier circuit has input and output coupling circuits (21 and 22) designed on quite different matching principles to obtain a circuit compactness similar to a reactively-matched amplifier and cascadable electrical characteristics similar to a distributed amplifier. The input coupling circuit (21) is formed as a bandpass filter network (7a, 7b, 7c, 17a, 17b, 9) supporting a travelling wave to which the amplifying device (3) is capactively connected. This input network (21) terminates in a resistor (9) in which the travelling wave is dissipated. The output coupling circuit (22) is a reactively matched circuit (8a, 8b, 18a, 18b) which also has a bandpass characteristic. By making the input network (21) bandpass (instead of low pass) a large amplifying device (3) can be used, without reducing line impedance and gain.
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Kraus Robert J.
Mottola Steven
U.S. Philips Corporation
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