Amplifier having two operating modes

Details Amplifier having two operating modes Amplifier having two operating modes

1990-07-27

1991-10-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330297, H03F 345

Patent

active

050599216

ABSTRACT:
An amplifier having an input and output stage for providing drive current to a load coupled thereto includes circuitry that senses when an input signal is applied to the amplifier and is responsive thereto for providing an enabling signal at an output thereof and current regulator circuitry that supplies a low drain current to bias the stages when the amplifier is in a quiescent operating mode absent an applied input signal and that is responsive to the enabling signal for increasing the current supplied to the stages to bias the same in a high bias drain current operating mode.

REFERENCES:
patent: 4077013 (1978-02-01), Morez et al.
patent: 4555674 (1985-11-01), Palara et al.

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