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VCA810的反向增益的问题

Other Parts Discussed in Thread: VCA810

根据公式G (dB) =–40●(V c+1)dB.我将Vc 端电压调到-1V到-1.5V时(-1.5V到-2V就自激了),VCA810同向增益,使用正常。当我把Vc 端电压调到0V到-1V时,应该是反相增益,但是我观察到的结果是输出波形并没有增益,也没有反相。请各位专家指点。