AMPLIFIER FOR ELECTROSTATIC TRANSDUCERS

摘要

A class D audio amplifier which provides both an alternating signal and a DC bias voltage to an electrostatic transducer (9). The amplifier comprises an input module (1) for generating a modulated sequence of pulses in response to an input audio signal, and an output module (3) for amplifying the sequence of pulses, which includes high speed switching output transistors (4, 5). A power supply (6) provides a supply voltage to the switching output transistors (4,5). A low pass filter (8) receives the amplified sequence of pulses and generates an output signal for the transducer. The amplified sequence of pulses from the output module (3) is fed to a voltage multiplier module (10) which provides a constant bias voltage for the electrostatic transducer.