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高压高频率信号调理

Other Parts Discussed in Thread: INA157

        针对幅度0~±50V,频率0~1MHz模拟信号采集要求,需设计一款输入阻抗不低于200MΩ,放大倍数为0.2的信号调理电路,且调理电路工作电源不超过±15V。请教各位有没有好的实现方案。选择使用差动放大器(INA157)发现输入阻抗不足,且发现输入信号频率增加时导致输出相位与放大倍数发生严重变化。