Audio amplifier with phase modulated pulse width modulation

Details Audio amplifier with phase modulated pulse width modulation Audio amplifier with phase modulated pulse width modulation

1989-10-17

1991-02-12

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

363 26, H03F 3393

Patent

active

049927515

ABSTRACT:
In a digitally controlled amplifier circuit a dc power source is modulated by an oscillator signal for producing a reference square wave signal. A sawtooth signal, double the frequency of the reference signal and synchronized therewith, is compared with a variable input signal to be amplified. When the sawtooth exceeds the input signal a phase shifted version of the reference signal, shifted in phase in accord with the instantaneous amplitude of the variable signal is produced. A switching circuit logically governed by the reference and phase shifted signals produce a pulse width modulated output signal of a selected polarity. An output filter smooths the pulse width modulated output signal and steering diodes control the polarity of the switching circuit.

REFERENCES:
patent: 4178556 (1979-12-01), Attwood
patent: 4182992 (1980-01-01), Attwood
patent: 4479175 (1984-10-01), Gille et al.
patent: 4509101 (1985-04-01), Kenji
patent: 4600891 (1986-07-01), Taylor, Jr. et al.
Very High Fidelity Quartz Controlled PWM (Class D) Stereo Amplifiers for Consumer and Professional Use, Attwood, Brian E., Hamburg, Feb. 28-Mar. 3, 1978.
A 0.5 MHz Switching DC-AC Inverter Topology Provides Low EMI Environments for Critical Spacecraft Applications, Attwood, Brian E., Apr. 10-12, 1984.
Phase-Modulated AC Supply Exhibits High Efficiency, Zansky, Zoltan, Oct. 3, 1985.

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