| 摘要 |
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.
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