Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1990-12-10
1991-11-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330286, 330295, H03F 326
Patent
active
050669257
ABSTRACT:
In a particular embodiment, the invention is directed to a composite MMIC amplifier comprising a plurality of active devices (e.g., FET, HBT, HEMT) arranged on a semiconductor substrate and having inputs and outputs. A pair of input and output transmission lines are coupled in antiphase arrangement to corresponding inputs and outputs of alternate active devices. Each pair of input transmission lines has branched portions extending from a common polarized input terminal. Each branched portion of like polarity extends to a corresponding alternate input and output of an active device and crosses a branched portion of opposite polarity without interference. Impedance matching means is coupled across antiphase pairs of inputs and outputs of adjacent active devices and forms a virtual ground therebetween thereby simplifying the impedance matching circuit.
REFERENCES:
patent: 4547745 (1988-10-01), Freitag et al.
patent: 4647868 (1987-03-01), Mueller
patent: 4749969 (1988-06-01), Boire et al.
"High-Efficiency 1-, 2-, and 4-W Class-B FET Power Amplifiers", Lane, John R. et al., IEEE Transactions on Microwave Theory and Techniques, vol. MIT-34, No. 12, pp. 1318-1325 (Dec. 1986).
"A 2.5-Watt High Efficiency X-Band Power MMIC", Avasarala, M. et al., IEEE 1989 Microwave and Millimeter-Wave Monolithic Circuits Symposium, pp. 25-28 (1988).
Mullins James B.
Sutcliff W. G.
Westinghouse Electric Corp.
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