我们先来回顾一下ZEN1中介绍的SOZ放大器。SOZ电路结构的特点是单级增益,无反馈,信号路径中无电容。SOZ的效率非常低,不足4%。为了获得20W的输出功率,不得不耗散掉500W的功率。在ZEN6中,我们使用超级对称技术来改造SOZ,电路中引入了反馈,增加了电容。升级以后的SOX放大器在失真和输出阻抗这两项指标均有显著改善。但是电路的整体结构改变并不大,SOX的效率仍然比较低。 Let’s review the SOZ amplifier introduced in ZEN1. SOZ circuit structure is characterized by single-stage gain, no feedback, no signal path capacitance. The efficiency of SOZ is very low, less than 4%. In order to get the output power of 20W, 500W power has to be dissipated. In ZEN6, we use super symmetry technology to transform SOZ, introducing feedback into the circuit that adds capacitance. SOX amplifier after the upgrade distortion and output impedance of these two indicators have significantly improved. However, the overall structure of the circuit changes is not large, SOX efficiency is still relatively low.