Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1978-10-02
1979-12-25
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 69, 330207P, 330260, 330295, 330298, H03F 345
Patent
active
041807804
ABSTRACT:
A transistor amplifier circuit is arranged in a differential amplifier incorporated into a power amplifier output circuit having approximately unity voltage gain and capable of feeding high current and power outputs to a load in response to high level voltage inputs from a signal source. This same signal source may be connected to drive a plurality of different output circuits simultaneously. A decoupling diode is provided in series with the emitter of each of the transistors of the differential amplifier, these diodes having a reverse breakdown voltage which is of the order of twice the peak input voltage and the supply voltage such that in the event that a short should appear in the load or in the power amplifier being driven, the diodes will act to effectively decouple the output of the signal source from the short circuit, thereby preventing the signal source output from being loaded down and, as a result, distorted.
REFERENCES:
patent: 4087758 (1978-05-01), Hareyama
Altec Corporation
Dahl Lawrence J.
Sokolski Edward A.
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