Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1993-06-01
1996-02-13
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330282, 330294, H03F 134
Patent
active
054914507
ABSTRACT:
A low power consumption amplifier that is essentially insensitive to the process used to fabricate the active devices of the amplifier employs feedback to minimize variations in electrical characteristics of the devices. For weight-sensitive microwave applications, a high electron mobility transistor (HEMT) or a pseudomorphic high electron mobility transistor (PHEMT) may be selected as an active device for each stage of the amplifier. HEMTs and PHEMTs typically exhibit greater device gain than do MESFETs, especially at the upper portion of X-band and above, so that a HEMT- or PHEMT-based stage of an amplifier where additional overall gain is required, can be achieved without significantly adversely affecting power consumption demands, and attendant electrical energy storage/generation requirements while achieving and/or maintaining an overall flat gain characteristic of the amplifier.
REFERENCES:
patent: 5015968 (1991-05-01), Podell et al.
patent: 5068624 (1991-11-01), Taneichi et al.
patent: 5208547 (1993-05-01), Schindler
Fithian Michael J.
Helms David R.
Checkovich Paul
Martin Marietta Corporation
Mullins James B.
Young Stephen A.
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