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VCA821_AGC模块电路中OPA820输出不能调零

Other Parts Discussed in Thread: VCA821, OPA820, OPA695

VCA821_AGC模块电路中OPA820输出不能调零,按照手册上的电路做了两块板子,其他功能正常,但是就是OPA820同相输入端接地时OPA820输出还有大概是0.5V的直流电导致AGC最后输出波形一直无法减小(正负5V供电,频率大概10M-100M)。换成其他低噪声IC可以工作,但是就是速度太慢,调整速度跟不上。电路图如附件所示,麻烦老师们指导一下,谢谢