Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1981-04-24
1984-03-27
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330296, 330273, H03F 326
Patent
active
044397437
ABSTRACT:
A biasing circuit for a non-switching type power amplifier includes first and second DC voltage supply terminals; at least one input resistor; first and second output resistors; first and second output transistors, each having a main current path and an input electrode, the input electrodes of which are connected to the at least one input resistor, and the main current paths of which are connected in series between the first and second DC voltage supply terminals through the first and second output resistors, the connection point of the first and second output resistors constituting a signal output terminal; a signal input circuit for supplying an input signal to the input electrodes of the first and second output transistors, through the at least one input resistor; third and fourth DC voltage supply terminals; a series circuit comprised of a at least one input variable current source, the first resistor and a second variable current source, the series circuit being connected between the third and fourth DC voltage supply terminals; a voltage detecting circuit for detecting one of the voltages across the first and second output resistors or one of the voltages supplied to the input electrodes of the first and second output transistors; and a control circuit for controlling at least one of the first and second variable current sources in accordance with the detected output of the voltage detecting circuit.
REFERENCES:
patent: 4274059 (1981-06-01), Okabe
Hikaru Kondo, "Nuevo Concepto en Amplificadores de Potencia Pava Audio", Nundo Electronico, 1980, No. 102.
Higuchi Tadashi
Schwarz Manfred
Eslinger Lewis H.
Mullins James B.
Sinderbrand Alvin
Sony Corporation
Wan Gene
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