Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1988-04-12
1991-02-12
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330267, H03F 226
Patent
active
049919164
ABSTRACT:
Method and apparatus are disclosed for automatically biasing a push-pull amplifier. Generally, the auto-biasing circuit of the present invention includes a resistor circuit for sensing the supply current to the push-pull amplifier. A control circuit responds to a minimum value of the supply current to increase charge which is stored in a charge storage circuit. A source circuit responds to the increase in stored charge of the charge storage circuit to increase a control current and, consequently, increase the supply or bias current of the push-pull amplifier. In an alternative embodiment a dynamic control circuit is used to continually modulate the supply current so that the difference between the average supply current and the average output current is maintained at a predetermined value.
REFERENCES:
patent: 3536958 (1970-10-01), Sondermeyer
patent: 4077013 (1978-02-01), Morez et al.
patent: 4121168 (1978-10-01), Stitt
6.62 A Simple Direct-Coupled Power MOSFET, Audio Amplifier Topology Featuring Bias Stabilization-1982 IEEE, Reprinted.
6.6 Audio Amplifiers, 6.6.1 The Autobias Amplifier: A New (AC Coupled) Topology for Automatically Biased Audio Amplifiers using Power MOSFETs (TA82-1).
John Fluke Mfg. Co. Inc.
Mottola Steven
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