CAJ | 학술논문

在计算共射复合管放大电路静态电流基础上，得到相应的高频小信号简化等效电路，交流分析下的源电压增益、幅频特性曲线及截止频率，结果与MATLAB相一致。采用分析电容电路的理想化处理方法，仿真和计算了不同结电容所在回路的时间常数。结果表明，尽管T1管集电结电容数值很小，但受两级放大高密勒效应的影响，所在回路等效电阻很大，造成小电容条件下时间常数仍较其它大，表现为截止频率对其变化极为敏感，影响着截止频率。这些方法为分析各种放大电路的频率响应提供了一些借鉴。
재계산공사복합관방대전로정태전류기출상，득도상응적고빈소신호간화등효전로，교류분석하적원전압증익、폭빈특성곡선급절지빈솔，결과여MATLAB상일치。채용분석전용전로적이상화처리방법，방진화계산료불동결전용소재회로적시간상수。결과표명，진관T1관집전결전용수치흔소，단수량급방대고밀륵효응적영향，소재회로등효전조흔대，조성소전용조건하시간상수잉교기타대，표현위절지빈솔대기변화겁위민감，영향착절지빈솔。저사방법위분석각충방대전로적빈솔향응제공료일사차감。
Based on the result of static current of CE Darlington tubes amplifier circuit,obtained a high-frequency small-signal simplified equivalent circuit,as well as the voltage gain,amplitude frequency response,and cutoff frequency,which are in agreement with the results obtained by MATLAB.Adopting the ideal method of analyzing capacitive circuit,the time constant of the loops,where the different junction capacitance in,was simulated and calculated.The results show that although theT1 tube collector junction shows little capacity,due to the influence of two-stage amplifier high-miller effect,the equivalent resistance of the loop is big.This leads to bigger time constant under small capacity,which behaves that the cutoff frequency is very sensitive to it,and further influence the cutoff frequency.Above method can provide some reference for analyzing frequency response of various kinds of amplifier.