Power efficient amplifier

Details Power efficient amplifier Power efficient amplifier

2007-04-12

2009-02-17

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S075000

Reexamination Certificate

active

07492219

ABSTRACT:
An amplifier generates a tri-level output signal in response to an input signal that is pulse-width modulated. The amplifier is filterless and DC free. The amplifier includes an integrator, a signal generator, comparator, a switch pulse logic block, a driver, and a control block. The control block supplies a multitude of pulse-width modulated (PWM) signals in response to the received digital input signal. A pair of the PWM signals are applied to the signal generator which in response supplies a signal to the integrator. The integrator's output signal is compared to a reference signal by the comparator. The switch pulse logic block receives the output of the comparator and a pair of delayed PWM signals and in response generates a multitude of driver signals applied to the driver. The driver supplies an output signal that is adapted to vary between first, second and third voltages.

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Nielsen, K., “PEDEC—A Novel Pulse Referenced Control Method for High Quality Digital PWM Switching Power Amplification”,IEEE, 1998, pp. 200-207.

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