西楼
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Thank you for your kindness. You are right.As you said,W,L must be small as much as possible.When I change the W and L(randomly but of course be small),the ac response is much more better(simulation graph pasted below with R2/plus input signal;R0/plus,R1/plus output signals).It is 10:10 ratio. However,the input current is also pull down.I have to tradeoff.Normally,input current can reach 20.8uA without any load. The output signal,R1/plus,has a little ripple(the zoom in graph of R1/plus pasted below). Besides,loose-electron,would you like to explain how to get the bandwidth of my design in detail? I can't quite follow you.Thank you again.
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