Pulse width modulation amplifier circuit

Details Pulse width modulation amplifier circuit Pulse width modulation amplifier circuit

1989-11-08

1990-08-14

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, 330295, H03F 338

Patent

active

049490486

ABSTRACT:
A pulse width modulation amplifier circuit includes a comparator which receives an analog signal and generates first and second analog signals having a phase difference of 180 degrees. A phase shifting circuit produces first and second triangular wave carrier signals so as to establish therebetween a phase difference of approximately 90 degrees. First and second pulse width modulation amplifiers, having output terminals connected to a load, pulse width modulate the first and second triangular wave carrier signals with said first and second analog signals, respectively, and amplify resultant pulse width signals.

REFERENCES:
patent: 3336538 (1967-08-01), Crowhurst
patent: 3629616 (1971-12-01), Walker
patent: 4673889 (1987-06-01), Cini et al.
"Schaltungstechnik des D-Verstarkers", Radio Fernsehen Elektronik 24, 1975, pp. 789-793.
"Applikator", Elektor, Apr. 1987, pp. 71-73.
"PDM-Verstarker", Verstarkertechnik, 1988, pp. 34-36.
"Design Considerations in Class D MOS Power Amplifiers", John Murray et al., IEEE Transactions on Industrial Electronics and Control Instrumentation, Nov. 1979, pp. 211-218.

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