Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-10-20
2000-07-25
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330 54, H03F 345, H03F 360
Patent
active
060940999
ABSTRACT:
A dc distributed Gm gain control circuit formed from differential bipolar distributed amplifier topology. In accordance with an important aspect of the invention, the distributed Gm gain control relies on a shunt configured, area weighted, transistor current source switches (QA.sub.x, QB.sub.x, QC.sub.x, QD.sub.x) for each differential amplifier stage (22, 24, 26, 28) of the distributed amplifier (20) in order to control the offset voltages of each differential amplifier stage (22, 24, 26, 28) without imposing performance degradation by way of a series resistive ladder.
REFERENCES:
patent: 4992752 (1991-02-01), Cioffi
patent: 5550513 (1996-08-01), Wong
patent: 5559472 (1996-09-01), Kobayashi
patent: 5751190 (1998-05-01), Nguyen et al.
Thomas Y. K. Wong, et al., "A 10 Gb/s AlGaAs/GaAs HBT High Power Fully Differential Limiting Distributed Amplifier for III-V Mach-Zehnder Modulator", Oct. 1996, pp. 1388-1393, IEEE Journal of Solid State Circuits, vol. 31, No. 10.
William J. Thompson, "A Broadband Low Noise Dual Gate FET Distributed Amplifier", 1988, pp. 11-13, IEEE 1989 Microwave and Millimeter-Wave Monolithic Circuits Symposium.
Pieter J. G. Van Lieshout, et al., "A Monolithic Wideband Variable Gain Amplifier with a High Gain Range and Low Distortion", 1997, pp. 358-359, 1997 IEEE International Solid State Circuits Conference.
Lee Benny
Nguyen Patricia T.
TRW Inc.
Yatsko Michael S.
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