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How to simulate CMRR of full-differential amp

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m19851222

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I have recently made full-differential analog circuits.
However, a problem encountered.I can not simulate the value of Acm.
My netlist is as follows

.lib 'C:\spicemodel\XXXX.l' TT
.INC "PFULLYD.SPI"
.OPTION ACOUT=0

XPFULLYD VDD GND VIN1 VIN2 VO1 VO2 VCM PFULLYD

VDD VDD GND DC 3.3V
VCM VCM GND 1.3912V

VIN1 VIN1 GND DC 1.46 AC 0.5
VIN2 VIN2 GND DC 1.46 AC 0.5

.OP
.AC DEC 10 10N 100G
.PROBE AC VDB(VO1,VO2)
.END

Could somebody tell me the problem is where do?

Thanks a lot!!
 

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