Variable-gain amplifier stage equipped with field-effect transis

Details Variable-gain amplifier stage equipped with field-effect transis Variable-gain amplifier stage equipped with field-effect transis

1981-01-26

1983-11-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

044158645

ABSTRACT:
A variable gain amplifier stage comprises two field-effect transistor connected as a differential pair with a controlled tail-current source as gain control so that a slope control is obtained. The transistors, connected as a differential pair, each have a field-effect transistor operated in the triode region as a load so that the signal resistance of said transistors is a function of the tail current. The gain factor of the amplifier stage thus is determined by the slope of the amplifier transistor as a function of the tail current and by the signal-current resistance of the load transistors as a function of the control current, which, over a comparatively wide range of tail current, yields a substantially linear relationship between the gain factor expressed in decibels and the tail current.

REFERENCES:
patent: 3961279 (1976-06-01), Davis
Hosticka, B. J., Dynamic Amplifiers in C.M.O.S. Technology Electronics Letters, Dec. 6, 1979, vol. 13, No. 25.

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