FET transconductance amplifier with improved linearity and gain

Details FET transconductance amplifier with improved linearity and gain FET transconductance amplifier with improved linearity and gain

1986-09-02

1988-01-19

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330253, 330311, H03F 132, H03F 345

Patent

active

047206853

ABSTRACT:
An FET high frequency analog amplifier circuit employs a feed-forward technique to provide a first order correction of amplifier distortion. In one embodiment, the amplifier is configured as a differential set of cascode FET stages. A linearization stage is connected across the output cascode transistors to provide a cancellation signal to reduce amplifier nonlinearities. The linearizing circuit includes a pair of field effect transistors in source-coupled arrangement with their respective bases driven by the drains of the differential amplifier input transistors. The gates are further driven by biasing current sources. The drains of the linearizing transistors are cross connected to the drains of the cascode output transistors, thereby injecting a compensating error signal into each differential output node and cancelling circuit nonlinearities. The amplifier is well suited for fabrication in integrated circuit form, especially using gallium arsenide technology.

REFERENCES:
Kupfer, "Die Differenzkaskodestufe", Radio Fernsehen Elektronik, vol. 26, No. 9, 1977, pp. 307-310.
Quinn, "A Cascode Amplifier Nonlinearity Correction Technique", 1981, IEEE International Solid-State Circuits Conference, Feb. 19, 1981, pp. 188-189, 272.

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