Constant voltage - constant current high fidelity amplifier

Details Constant voltage - constant current high fidelity amplifier Constant voltage - constant current high fidelity amplifier

1977-12-20

1978-08-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, 330151, 330261, 330311, H03F 345

Patent

active

041076192

ABSTRACT:
A transistor amplifier in which collector to emitter voltages and currents are kept constant, particularly in the power output stages of the amplifying devices for minimizing distortion due to changes in the transistor beta, the essential form of distortion in amplifiers. High fidelity low power output current from a cascoded transistor amplifier is fed through a load to a second, high power, amplifier having constant current and less than unity gain, with an output summed with the output of the first amplifier such that the output of the first low power amplifier is the signal bearing portion and the output of the second amplifier serves as a current bootstrap, increasing the effective impedance of the load as seen by the first amplifier.

REFERENCES:
patent: 3970953 (1976-07-01), Walker et al.

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