Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2006-10-24
2006-10-24
Mottola, Steven J. (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S20700P
Reexamination Certificate
active
07126416
ABSTRACT:
The present invention provides a PAM (Pulse Amplitude Modulation) method and circuit for improving the performance of a D-class audio amplifier. The D-class audio amplifier is inputted with a PWM signal and designed to have a dead time function for time delay. In order to decrease the distortion of the output signal caused by the dead time design, the present invention comprises the following steps:detecting the polarity of the current of an output terminal of the D-class audio amplifier; adding a voltage adjustment circuit to a power source of the D-class audio amplifier to lower the voltage of the power source of the D-class audio amplifier from high voltage to low voltage during dead time when the polarity of the current is negative; adding a voltage compensation circuit to a low voltage point of the D-class audio amplifier to compensate the voltage of the low voltage point of the D-class audio amplifier for ascending the voltage of the low voltage point from low voltage to high voltage during the dead time when the polarity of the current is positive.
REFERENCES:
patent: 5973368 (1999-10-01), Pearce et al.
patent: 6831509 (2004-12-01), Mitamura
patent: 7049885 (2006-05-01), Ishizaki
Mottola Steven J.
Princeton Technology Corporation
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