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

1990-09-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330261, H03F 345

Patent

active

049596217

ABSTRACT:
A differential amplifier having externally controllable power consumption. The differential amplifier has an external circuit stage for signal-dependent setting of the power consumption. The circuit stage is composed of two field effect transistors connected parallel to one another that are arranged in series with a resistor of the output side via which the current source of the differential amplifier is set. The field effect transistors are driven by a level-converting circuit proceeding from the amplifier input, this level-converting circuit being equipped with a control circuit. The control circuit defines the operating points of the field effect transistors with and without applied input signal and thus controls the signal-dependent boosting of the amplifier current.

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

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