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请教VCA810增益的问题

Other Parts Discussed in Thread: VCA810

专家们好,我做了一个VCA810的可控增益电路,但是调试的时候发现,当接入的控制电压为-1.5V时候输出出现了很大的毛刺,几乎自激了,整体的增益变化范围是-20dB到+20dB,请问该怎么调整使电路正常增益到-40到+40dB呢?期待着您的指导。