ApplicationNo. 06/644775 filed on 08/27/1984
US Classes:330/10, MODULATOR-DEMODULATOR-TYPE AMPLIFIER330/251Including Class D amplifier
ExaminersPrimary: LaRoche, Eugene R.
Assistant: Mottola, Steven J.
Attorney, Agent or Firm
International ClassesH03F 3/20 (20060101)
H03F 3/217 (20060101)
AbstractA switching amplifier comprises an input terminal connected to a d.c. power supply and an output terminal connected to a load. At least one power transistor is placed in series with the input and output terminals. A PWM circuit outputs a pulse width modulated signal. An isolating driver circuit between the PWM circuit and the control terminal of the power transistor comprises a low voltage power supply; a transformer having primary and secondary windings; an oscillator for outputting a high frequency signal; means for gating the high frequency signal from the oscillator to the primary winding of the transformer in response to the pulse width modulated signal from the PWM circuit; a MOSFET; means for rectifying the voltage in the secondary winding of the transformer and for applying the rectified voltage to the gate of the MOSFET; and switching means for rapidly discharging the gate of the MOSFET when the high frequency signal is no longer gated to the transformer.