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光电转换电路中有一级电路叫frequency compensation circuit不是很懂,求指教

下面附上三篇文章中的电路图:每个电路图中的第二级电路的输入电阻上面都并联一个电容,这个以前没见过,说是频率补偿电路,求指教。

三个电路用来做光检测,前级的反馈电阻都很大,并联反馈电容,把带宽限制了,然后第二级把带宽在拓展。