Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1979-01-05
1980-10-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330273, 330297, H03F 326
Patent
active
042297060
ABSTRACT:
Disclosed is a Class A power amplifier circuit which includes means for controlling the quiescent bias current of the output devices of the amplifier and providing absolute overload and short circuit protection without the need of extra protective devices of any kind. The circuit includes a driver stage which amplifies an input signal and provides two outputs which are out of phase with respect to each other by 180.degree.. One output of the driver stage provides a drive signal to the control input of a first output device, while the other output of the driver stage provides a drive signal to the control input of a second output device. Power is provided to the driver stage by a standard grounded center-tapped power supply. A pair of independent floating power supplies are cross-connected between the two output devices so that the supply terminal of each output device is connected to one terminal of one of the power supplies, while the output terminal of each of the output devices is connected to the opposite phase terminal of the opposite power supply. A resistor is connected between the output terminal of each of the output devices and one terminal of the power supply which powers the driver stages. The load is connected between output terminals of the output devices. The circuit arrangement provides control of the value of the quiescent control input current of each of the output devices which in turn controls the quiescent value of the bias currents of each of the output devices, thus resulting in an amplifier of greatly improved thermal stability.
REFERENCES:
patent: 2877310 (1959-03-01), Donald
patent: 3351866 (1967-11-01), Goldsmith
patent: 3383613 (1968-05-01), Novak
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