Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design

摘要

A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages, and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.

主权项

1. A clamping circuit comprising:
a reference voltage circuit; a plurality of Darlington transistors having a plurality of inputs coupled to the reference voltage circuit, and a plurality of outputs for providing a plurality of clamped voltages; and a split Darlington transistor comprising
a first transistor and a second transistor coupled together in a Darlington configuration,at least one third transistor coupled to the second transistor,the first transistor, second transistor and at least one third transistor having inputs coupled to the reference voltage circuit, andthe second transistor and at least one third transistor having a plurality of outputs for providing a plurality of AC ground voltages.