Circuit for simulating vacuum tube compression in transistor amp

Details Circuit for simulating vacuum tube compression in transistor amp Circuit for simulating vacuum tube compression in transistor amp

1981-09-04

1984-03-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, 330273, 330124R, H03F 326, H03F 368

Patent

active

044397429

ABSTRACT:
Circuitry is provided for simulating a combination of vacuum tube clipping and soft cross-over characteristics in a transistor power amplifier circuit. A first circuit includes a biasing network for assuring that the transistor amplifier saturates in response to high level input signals. A second circuit includes a biasing network for providing sufficient bias current to maintain the transistor in an active, rather than cutoff, operating region when the first circuit fails to provide the needed bias at times when the instantaneous input signal level is low but average or peak input levels are high. A combining circuit provides the higher of the bias values to the amplifier, to assure that the amplifier saturates for particular high level inputs yet operates at a modified, linear mode for low level inputs, thus simulating a compression characteristic of vacuum tube amplifiers.

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