how to understand the test bench of fully differential Opmap

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hi,
I just read "FUNCTIONAL VERIFICATION OF A DIFFERENTIAL OPERATIONAL AMPLIFIER.pdf" from cadence.com before testing my circuits. but i can't clearly understand the function of "acOpendiff" which is written in verilog-A.
who can tell me in details?

Best Regards
jeff
 

it is just a switch
which is closed when dc analysis and opened when ac analysis
 

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