Amplifiers – With semiconductor amplifying device – Including temperature compensation means
Patent
1997-04-11
1999-01-12
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including temperature compensation means
330296, H03F 130
Patent
active
058595686
ABSTRACT:
An amplifier includes an amplifying circuit and bias current circuit. The bias current circuit includes a beta matching circuit which employs a temperature compensated current reference to develop a bias current for the amplifying circuit. The beta matching circuit is connected to track the current gains of transistors within the amplifying circuit and to thereby provide a temperature compensated bias current to the amplifying circuit. The bias current maintains a fixed bias point regardless of temperature-induced, or other, variations of the current gains of the amplifying circuit's transistors.
REFERENCES:
patent: 4260956 (1981-04-01), Harford
patent: 4339729 (1982-07-01), Jason et al.
patent: 5307027 (1994-04-01), Grasset
Paul Horowitz and Winfield Hill, The Art of Electronics, Cambridge University Press, New York, 1989, p. 869.
Walt Kester Ed., Linear Design Seminar, Analog Devices, Norwood, MA, 1991, pp. 8-2 through 8-18.
Wai-Kai Chen, ed., The Circuits and Filters Handbook, CRC Press, Boca Raton, Florida, 1995, pp. 1619-16-28.
Devendorf Don C.
Hirata Erick M.
Le Hieu M.
Linder Lloyd F.
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Mottola Steven
Raytheon Company
Schubert William C.
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