Amplifier devices

Details Amplifier devices Amplifier devices

1977-01-26

1978-02-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

040770125

ABSTRACT:
In an amplifier device of the type comprising a differential amplifier including a pair of parallel-connected field effect transistors, an emitter grounded transistor responsive to the output of the differential amplifier and acting as class "A" amplifier, an output terminal connected to the collector electrode of the emitter grounded transistor and a constant current drive circuit connected to the commonly connected source electrodes of the field effect transistors, a feedback resistor is connected between the output terminal and the constant current drive circuit for modulating the current of the constant current drive circuit in accordance with the amplitude of the output signal.

REFERENCES:
patent: RE28184 (1974-10-01), Beck et al.
patent: 3370242 (1968-02-01), Offner
patent: 3512099 (1970-05-01), Ohwada
patent: 3914704 (1975-10-01), Craft

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