电路如 图所示功能为:给电容充放电形成电流,再经跨组放大器将电流转换为电压,最后再差分。跨组值选为1K,反馈电容根据公式计算为318p。实验测试,输入端电容的电流为正负4mA,经跨组放大之后应该是正负4伏啊,为什么测试结果是正负2伏?
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