Gain control circuit and semiconductor device

Details Gain control circuit and semiconductor device Gain control circuit and semiconductor device

1992-08-18

1994-06-07

Nelli, Raymond A.

Amplifiers

With semiconductor amplifying device

Including gain control means

330283, 330277, H03G 312

Patent

active

053193180

ABSTRACT:
A gain control circuit includes a first FET for serving as an active load, a second FET serving as an amplifier, and a third FET for serving as a current source. The first, second, and third FETs have substantially the same characteristics and are mutually connected in a series. The gain control circuit further includes a fourth FET for serving as a variable active load connected in parallel with the third FET and a capacitor connected between the third and fourth FETs. The fourth FET is also connected to a gain control terminal. The gain of the second FET is controlled by the voltage applied to the gate of the fourth FET through said gain control line.

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A. Yamamoto et al., "A Compact Satellite 1 GHz Tuner with GaAs IC", IEEE Transaction on Consumer Electronics, vol. 35, Aug. 1989 pp. 397-405.

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