Digital PWM input D class amplifier by PWM negative feedback

Details Digital PWM input D class amplifier by PWM negative feedback Digital PWM input D class amplifier by PWM negative feedback

2005-10-04

2005-10-04

Nguyen, Patricia (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S293000

Reexamination Certificate

active

06952131

ABSTRACT:
Disclosed is a digital PWM input D class amplifier by PWM negative feedback. The amplifier includes: digital modulation part for modulating PCM signal of input audio to PWM signal; pulse width generating and correcting part for comparing difference between the PWM signal and output signal negatively fed back, with PWM ramp signal to generate PWM switching signal; output part for generating an amplified output audio signal in response to the PWM switching signal of the pulse width generating and correcting part; and voltage negative feedback loop for negatively feeding back signal of the output part and decreasing a harmonic component to provide the signal to the pulse width generating and correcting part. Thus, the invention compares the negative feedback signal with positive
egative (+/−) saw tooth PWM ramp signal to control On/Off time period of switching transistor and the PWM pulse width and thereby enhance the linearity of the output PWM.

REFERENCES:
patent: 5398003 (1995-03-01), Heyl et al.
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patent: 6-29757 (1994-02-01), None
patent: WO 99/08379 (1999-02-01), None

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