A digital power output measurement based on binary rate multiplication technique

Abstract

A new design of a power output measurement of an audio power amplifier is presented. The design is based on the Binary rate multiplication technique(BRM) which is a digital multiplier. A signal proportion to the output voltage of the power amplifier, is applied for control the voltage to frequency converter(VFC) to produce the output frequency, which proportion to the output voltage of amplifier. At the same time, a signal proportion to the output current of power amplifier is applied to die analog to digital converter(ADC) to produce the Binary bit rate that proportion to the output current. The VFC output and ADC output are applied to a binary rate multiplier(BRM). The BRM frequency output is summed over a specified period of time to provide the power amplifier power output information. In addition, the intelligent power output measurement had implemented in this system. With this implementation, this system capable to adjust the input signal automatically to find the maximum power output without the expensive equipment such as the audio function generator, oscilloscope etc.