Calculating Loop Transmission Of 2nd Order Active Filter (K=1)

** Circuit Description **
* input signal source 
Vt 1 0 AC 1V 180degrees
* filter circuit
Egain 2 0 1 0 1
Inull 1 0 0 ; redundant connection
* feedback network
C1 2 3 1uF
R1 3 0 159.15
R2 3 4 159.15
C2 4 0 1uF
** Analysis Requests
.AC DEC 10 1Hz 1MegHz
** Output Requests **
.PLOT AC VdB(4) Vp(4)
.PROBE
.end