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VCA810 AGC 疑问求解

TI专家你好,

如图圈出的部分,实际我做时V-端接的为-5V,发现Vc端电压为正,不在正常范围内,于是调整R1 ,R2,减小其值(向小调),此时Vc会向负向移动一些,但是整个电路还是没法顺利的工作(820的调整作用大大减小),

还有那个圈出的电容取值对于信号频率是否有要求,

总体感觉就是820这部分对Vc 的控制作用有问题,

希望前辈给些R1,R2的参考值(V-=-5V时),谢谢