Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1994-02-08
1995-07-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330124R, 330145, 330295, 455 89, 455116, H03G 330
Patent
active
054304113
ABSTRACT:
A high frequency amplifying system includes an input coupling circuit having an input terminal for receiving a high frequency signal, a pair of amplifiers, and an impedance mismatch circuit for coupling each amplifier to a respective output terminal of the coupling circuit. The impedance mismatch circuit is controllable by a control signal supplied thereto to produce a selected degree of mismatch between the coupling circuit and the input impedances of the amplifiers, to thereby provide adjustable gain control of the amplifying system. The coupling circuit introduces phase shifts between the input and output terminals thereof which attenuates reflection therebetween of intermodulation products resulting from the presence of interfering signals at any of such terminals.
REFERENCES:
patent: 3371284 (1968-02-01), Engelbrecht
patent: 4216445 (1980-08-01), Abajian
patent: 5066924 (1991-11-01), Wendt
L. Nystrom, "A New Microwave Variable Power Divider", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-27, No. 1, Jan. 1979, pp. 89-90.
Eason Leroy
Mullins James B.
U.S. Philips Corporation
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