Differential amplifier having externally controllable power cons

Details Differential amplifier having externally controllable power cons Differential amplifier having externally controllable power cons

1989-06-16

1990-09-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H05F 345

Patent

active

049566130

ABSTRACT:
A differential amplifier having externally controllable power consumption. Differential amplifiers have a "static-bias" stage for setting the quiescent currents that flow in parallel circuit branches. Two field effect transistors that are connected parallel to one another are in series with an output resistor of this stage, these field effect transistors being driven via a level-converting circuit given the appearance of an input signal to be amplified, such that a voltage boost occurs at the output resistor. This voltage boost leads to a current boost in the differential amplifier. Good driver properties, a distortion-free signal transmission and a low dissipated power are provided by this external control of the two field effect transistors that results from the amplifier inputs.

REFERENCES:
patent: 4780688 (1988-10-01), Groom
patent: 4843341 (1989-06-01), Hosticka et al.
"Design of MOS VLSI Circuits For Telecommunications", New Jersey (1985) pp. 129, 136.

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