Class-D amplifier with dual feedback loop

Details Class-D amplifier with dual feedback loop Class-D amplifier with dual feedback loop

2011-08-09

2011-08-09

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07994853

ABSTRACT:
A class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit and an output driver. Two differential output terminals of the class-D amplifier are connected to two differential amplifiers of the second-order integrator to construct a second-order feedback loop for offering second order noise shaping, eliminating non-linear components in the class-D amplifier, and also enhancing signal to noise and distortion ratio (SNDR). Further, distortion component existing in the differential signal output from the differential output terminals is amplified by the two differential amplifiers so as to improve the loop gain of the class-D amplifier. The differential signal processed by the two differential amplifiers also can be precisely adjusted.

REFERENCES:
patent: 6998910 (2006-02-01), Hezar et al.
patent: 2007/0069814 (2007-03-01), Giotta et al.

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