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(四)直接耦合放大器的交流计算现以图15所示三级直接耦合放大器为例,加画交流放大电路,说明交流性能的计算程序.图18(a)示交流放大电路,输入和输出都采用变量器.电容器C_(c2)使第二级收集极交流接地,成为共集.电容器C_e使多级负反馈只是直流而不是交流,C_e又使第三级的R_e不产生交流串联负反馈.电容器C_(e1)使第一级的串联负反馈只是直流而没有交流.电容器C_(b1)使交流信号通过输入变量器加上第一级晶体管(这三级放大器在实际应用时,还需要某些交流多级负反馈和其它元件,
(D) directly coupled amplifier AC calculation Now shown in Figure 15 is three direct coupled amplifier, plus painted AC amplifier circuit, AC performance calculation program shown in Figure 18 (a) shows the AC amplifier circuit, both input and output The capacitor C_ (c2) makes the collector of the second stage grounded, making it a common set. The capacitor C_e makes the multi-stage negative feedback only DC but not AC, and the third stage R_e does not produce AC series negative feedback. Capacitor C_ (e1) makes the first stage of the series negative feedback only DC without AC capacitor C_ (b1) AC signal through the input transformer plus the first transistor (the three-stage amplifier in practical application, you also need a These exchange multi-level negative feedback and other components,