Instrumentation Amplifier

* op-amp subcircuit
.subckt ideal_opamp 1 2 3
* connections:      | | |
*              output | |
*             +ve input |
*               -ve input           
Eopamp 1 0 2 3 1e6
Iopen1 2 0 0A      ; redundant connection made at +ve input terminal
Iopen2 3 0 0A      ; redundant connection made at -ve input terminal
.ends ideal_opamp

** Main Circuit **
* signal sources 
Vcm 1 0 SIN (0 25V 60Hz)
Vdc1 1 2 DC 10mV
Vdc2 3 1 DC 10mV
* instrumentation amplifier
Xop_A1 6 2 5 ideal_opamp
Xop_A2 7 3 4 ideal_opamp
Xop_A3 10 9 8 ideal_opamp
R1 5 4 10k
R2 5 6 100k
R3 4 7 100k
R4 6 8 10k
R5 7 9 10k
R6 9 0 10k
R7 8 10 10k
** Analysis Requests **
.TRAN 0.1ms 66.68ms 0 0.1ms
** Output Requests **
.PRINT TRAN V(2) V(3) V(10) 
.probe
.end