Start-up circuit for self oscillating class D modulator

Details Start-up circuit for self oscillating class D modulator Start-up circuit for self oscillating class D modulator

1998-10-30

2000-09-12

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

061183369

ABSTRACT:
A class D modulator 100 is self oscillating. It includes an input stage 110, an operational amplifier 120, an integrator 130 and a pulse width modulator 140. A start-up generator 22 generates signals ENABLE and MUTE. The MUTE signal is connected to the input stage 110 to prevent any unwanted, initial sound. The ENABLE signal connects a start-up voltage source to the integrator 130 to set the initial voltage for integration. The ENABLE signal is coupled to a dead time control circuit 16 which controls the operation of the output power transistors 42, 44 to assure that the low side power transistor 44 is turned on before the high side transistor 42.

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patent: 5672998 (1997-09-01), Wittlinger
patent: 5805020 (1998-09-01), Danz et al.
patent: 5929702 (1999-07-01), Myers et al.
patent: 5973368 (1999-10-01), Pearce et al.

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