Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

1998-04-23

1999-11-23

Lee, Benny T.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, H03F 345

Patent

active

059907410

ABSTRACT:
A variable gain amplifier is disclosed, comprising a pair of differential MOS transistors M1 and M2 and a current mirror. The sources of the differential MOS transistors M1 and M2 are connected to a constant voltage terminal. Since a DC voltage Vc is added to input signals, output signals that are theoretically free of a distortion are obtained. The gain can be controlled from infinitesimal. Since the gain is directly proportional to the control voltage, it can be easily controlled. Since a single output current is free of a distortion, even if amplifiers are connected on many stages, an output signal that is free of a distortion can be obtained.

REFERENCES:
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patent: 4335355 (1982-06-01), Haque
patent: 4871978 (1989-10-01), Galbraith
patent: 5068622 (1991-11-01), Mead et al.
patent: 5334949 (1994-08-01), Sone
patent: 5600280 (1997-02-01), Zhang
IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications., vol.,42, No. 11,Nov.1995 Low-Voltage Analog IC Design In CMOS Technology, pp. 955-958, A.L. Coban et al.
IEEE Transactions on Circuits and Systems-I: Fundamental Theory and Applications, vol. 42, No. 8, Aug. 1995, An MOS Four-Quadrant Analog Multiplier Based on the Multitail Technique Using a Quadrital Cell as a Multiplier Core, K.Kimura, pp. 448-454.

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