基于Multisim的一种OTL功放电路仿真分析

Simulation of an OTL amplifier circuit based on Mutisim

JLH1969功放电路是一种经典的OTL(Output Transformerless无输出变压器)功放电路,为了确定实践中元器件参数,对其进行了Multisim仿真研究,针对影响放大器性能的主要因素,进行了对比试验,最后进行了硬件设计与制作。仿真试验结果包括:比较高的电源电压是有利的,至少达到16 V,但不宜过高;电路中的两个重要的电阻(R1、R2)的取值有规律性,可根据实际情况确定;不同三级管具有不同的性能,中间级三极管对整体性能影响最大,良好的搭配和工作条件控制可以提高性能。

JLH1969 amplifier circuit is a classic OTL(output transformer less)power amplifier circuit.In order to determine the parameters of the components,Multisim Simulation Research was carried out.Aiming at the main factors affecting the performance of the amplifier,the comparison test was carried out.Finally the hardware design and production were carried out.The results include:(1)higher supply voltage is better,16 V at least,but not too high;(2)values of the two important resistor(R1,R2)could be set as a variety of options,according to the the actual situation;(3)different transistor has different property,the middle one has the greatest influence,and good matching and working condition control can improve the performance.