Class-D amplifier

Details Class-D amplifier Class-D amplifier

2008-01-08

2008-01-08

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P, C330S251000

Reexamination Certificate

active

07317349

ABSTRACT:
A PWM circuit converts output data of a calculator to a pulse width modulation signal, and outputs it to a load (speaker) through a buffer amplifier and a low-pass filter. A digital low-pass filter has the same filter characteristic as a low-pass filter. An error calculator calculates the error Δ(z) between the input data and the output of the filter, and outputs it to the calculator. The output of the filter becomes a digital signal having substantially the same digitalized waveform as an analog signal applied to the load, and also no distortion contains in the digital signal. Accordingly, the output data Δ(z) of the error calculator becomes data corresponding to the distortion of the output signal. In the calculator, the data Δ(z) is subtracted from the input data, and the subtraction result is applied to the PWM circuit to reduce the distortion.

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Lu, Qian, Zeng, Yao, Chen & Wang: “Reduction of Digital PWM Limit Ring with Novel Control Algorithm”, dated 2001, 5 pgs.; Zhejiang University, Hangzhou 310027, PR China.

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