影响时分割乘法器准确度的主要因素分析

Analysis on main factors influencing accuracy of time-division multiplier

对广泛用于电能计量、功率测量等仪器装置中的时分割乘法器进行了研究. 阐述了其电路的工作原理,并就影响电路输出精度的主要因素时分割周期T的变化作了详细分析. 结果表明: 若选用性能优良的运放等元器件并选取适当参数值,则时分割乘法器的准确度可控制在0.2%以内.

Time-division multiplier is a more practical analog multiplier, which is also called Pulse width modulation operator. It is widely applied to electricity and power measurement. In the article the principle of the multiplier is described, and the influence of periodic sampling time T on accuracy of multiplier is analysed in detail. It has been proved that by using better quality amplifier and selecting appropriate parameter the maximal error of multiplier can be kept within 0.2%.