Abstract: An amplifier arrangement include a control circuit having an audio input and a control input, the control circuit producing an error signal proportional to the difference between the audio input and the control input; a comparator receiving the error signal as an input and having a first reference signal as an input and producing a comparator output signal comprising a gain control signal for an amplifier circuit; an amplifier circuit having the audio signal as an input and further having a gain responsive to the comparator output signal, the amplifier circuit having an output; a pulse width modulator circuit having the amplifier circuit output as an input, the pulse width modulator circuit converting an amplified audio signal comprising the output of the amplifier circuit into a pulse width modulated signal whose duty cycle represents audio information in the audio signal; a power amplifier switching circuit receiving the pulse width modulated output signal, the output of the power amplifier switching circui

Abstract: An amplifier arrangement for reducing nonlinearities in the response of an output transducer coupled to the amplifier arrangement is disclosed. The arrangement comprises a sensor coupled to a moving member of the transducer, a precision rectifier circuit having a signal to be amplified and an output signal from the sensor as inputs for comparing the signal to be amplified and the sensor output signal and for producing an error signal proportional to the difference between the two signals and a voltage controlled amplifier for amplifying the signal to be amplified whose gain is controlled by the error signal.