Silent start class D amplifier

Details Silent start class D amplifier Silent start class D amplifier

1996-06-27

1998-09-08

Mottola, Steven J.

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

058050205

ABSTRACT:
Start up noise in a class D amplifier--is corrected by adding an analog switch S1 to the integrator circuit A1. A resistor R3 in the feedback path of A1 prevents A1 from saturating. In an alternate embodiment silent start switch connects a variable resistance to the comparator input. The resistance gradually increases.

REFERENCES:
patent: 4458208 (1984-07-01), Abe
patent: 4673889 (1987-06-01), Cini et al.
patent: 4992751 (1991-02-01), Attwood et al.
patent: 5389829 (1995-02-01), Milazzo
patent: 5410592 (1995-04-01), Wagner et al.
Danz, G.E., "Class-D Audio II Evaluation Board (HIP4080AEVAL2)," Harris Semiconductor APPNOTE, No. AN9525.1, Oct. 1995.
Sherman, J.D., "Class D Amplifiers Provide High Efficiency for Audio Systems," EDN Design Feature, May 25, 1995, pp. 103-110.
Pauly, D.E., "High Fidelity Switching Audio Amplifiers Using TMOS Power MOSEFETs," Motorola Semiconductor Application Note, 1989.

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