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How can I use HSPICE calculate the gaim of different OP

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tony_wu_ad

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Dear all:

I use hspice to calculate the gaim of different OP. But there are some problem.The circuit has been shown below.

Now I have a problem. If I just calculate the one output gain, for example:：.AC gain Find Vdb(out1) at =1
It is OK, the gain =40dB

But if I calculate the different voltage between output, the gain si very small.for example: .AC gain Find Vdb(out1,out2) at =1
the gain is very small

Can not hspice calculate the different gain?

Please help me, thank you
 

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