Transconductance amplifiers and exponential variable gain amplif

Details Transconductance amplifiers and exponential variable gain amplif Transconductance amplifiers and exponential variable gain amplif

1994-07-01

1995-09-19

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330134, 330253, 330254, 330279, 330284, 330260, H03F 345, H03B 330

Patent

active

054519012

ABSTRACT:
Transconductance amplifiers having high speed, a wide output voltage swing, good linearity and expandability are disclosed. All active devices are n-channel MOSFET devices with the output current of the amplifiers being provided by devices with their sources tied to ground. Connection of one of the MOSFET transconductance amplifiers to a MOSFET load device and appropriate control of the MOSFET resistance devices in the transconductance amplifier and the load circuit provides a variable gain amplifier having a good estimation of an exponential response to the gain control signal, thus being suitable for use in closed loop automatic gain control circuits.

REFERENCES:
patent: 4459555 (1984-07-01), Jett, Jr.
patent: 4471324 (1984-09-01), Welland
patent: 4518870 (1985-05-01), Banu
patent: 5142242 (1992-08-01), Schaffer
patent: 5198780 (1993-03-01), Kase

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