Class D amplifier no low pass filter feedback with zero phase de

Details Class D amplifier no low pass filter feedback with zero phase de Class D amplifier no low pass filter feedback with zero phase de

1998-02-25

1999-09-07

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

059492821

ABSTRACT:
A circuit for generating an accurate reproduction of the output of a Class D amplifier for error-correction purposes includes a reference signal amplifier circuit. The reference signal amplifier circuit includes an op-amp configured as a differential amplifier that combines the digital outputs of the internal output stage of the amplifier into a single reference signal. By reducing the bandwidth of the op-amp, switching noise is removed from the digital signals, without adding any phase shift to the generated reference signal. In addition, by using the digital signals directly from the output stage rather than the filtered analog outputs of the amplifier, distortion due to external speaker-induced back-EMF is prevented. The reference signal can then be compared to the original signal input to the amplifier for error-correcting purposes.

REFERENCES:
patent: 4004246 (1977-01-01), Hamada
patent: 5410592 (1995-04-01), Wagner et al.
patent: 5610553 (1997-03-01), Kirn
patent: 5805020 (1998-09-01), Danz et al.

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