High-performance D type audio power amplifier with high-order multipath feedback structure
A multi-channel feedback and audio power technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, improved amplifiers to reduce noise effects, etc., can solve problems such as difficult to achieve high performance and low loop gain, and achieve The effect of simple structure, high integration and high performance
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[0029] The calculation scheme of the present invention will be further described below in conjunction with the drawings and embodiments.
[0030] figure 2 It is a structural diagram of a class D audio power amplifier monolithic circuit according to an embodiment of the present invention. Wherein, the integrators 221 and 222 of the variable gain amplifier 21 and the cascaded second-order integrator 22 are linear modules, the comparators 231 and 232 of the PWM modulation circuit and the carrier generation circuit 233, the three-state modulation circuit 24, and the gate drive circuit 251, 252 and power output stage 26 are non-linear modules.
[0031] The differential output terminal of the adjustable gain amplifier 21 is connected to the differential input terminal of the first-stage integrator 221 in the cascaded second-order integrator 22, and the differential output terminal of the second-stage integrator 222 is respectively connected to two comparators in the PWM modulation...
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