多输入信号放大器反馈极性的判断

Feedback Polarity Examination of Amplifier with Multiple Input Signals

分析了多输入信号反馈放大器各级净输入信号与其他信号的关系,给出了净输入信号与其他各输入信号的反馈关系公式,以此证明在判断反馈极性时,不应仅以第1级输入信号的影响为依据而忽视其他输入信号的影响.

The rehtions between every net input signal and other input signals are analyzed in feedback amplifier. The formuhs between net input signals and other input signals are given. When feedback polarity is examined, it＇s proved the method that only considering the influence of the firststage amplifier input signals and omitting the influence of the others input signals is wrong.