Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1983-02-18
1985-06-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330270, H03F 326
Patent
active
045217408
ABSTRACT:
An amplifier output circuit in which crossover distortion is largely eliminated, temperature compensation of idle current is obviated, and the idle current is maintained stable, independent of the magnitude of the input signal. In one embodiment in which two output amplifying elements are connected in a Class B SEPP circuit configuration, first and second error signal amplifiers are provided. While the first error amplifier functions as an error amplifier for an error voltage level shifted between the voltage at the output electrode of its current amplifying element and the voltage at the circuit input terminal, the second error amplifier functions as an error amplifier for an error voltage level shifted between the voltage at the output terminal of its amplifying element and the voltage at the circuit output terminal. On the other hand, while the second error amplifier is functioning as an error amplifier for the error voltage level shifted between the voltage at the output electrode of the second amplifying element and the voltage at the circuit input terminal, the first error amplifier functions as an error amplifier for an error signal level shifted between the voltage at the output terminal of the first amplifying element and the voltage at the circuit output terminal. In another embodiment, a bridge circuit is coupled between the output terminal of the circuit and the output electrode of the output amplifying element. In this case, the bias of the output amplifying element is controlled in accordance with the difference between the input signal level shifted and the voltage detected by the bridge circuit.
REFERENCES:
patent: 4370623 (1983-01-01), Nagasawa
Mottola Steven J.
Mullins James B.
Pioneer Electronic Corporation
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