Version 4
SHEET 1 1000 680
WIRE 160 -128 112 -128
WIRE 272 -128 224 -128
WIRE 32 -32 -48 -32
WIRE 112 -32 112 -128
WIRE 112 -32 32 -32
WIRE 160 -32 112 -32
WIRE 272 -32 272 -128
WIRE 272 -32 240 -32
WIRE -48 0 -48 -32
WIRE 32 16 32 -32
WIRE 272 16 272 -32
WIRE 272 32 272 16
WIRE -48 112 -48 80
WIRE 32 112 32 80
WIRE 192 128 192 112
WIRE 112 144 112 -32
WIRE 160 144 112 144
WIRE 272 160 272 112
WIRE 272 160 224 160
WIRE 352 160 272 160
WIRE 400 160 352 160
WIRE 480 160 400 160
WIRE 512 160 480 160
WIRE -16 176 -48 176
WIRE 160 176 -16 176
WIRE -48 208 -48 176
WIRE 192 208 192 192
WIRE 400 208 400 160
WIRE 480 224 480 160
WIRE -48 320 -48 288
WIRE 400 320 400 288
WIRE 480 320 480 288
WIRE -48 432 -48 416
WIRE 80 432 80 416
WIRE -48 528 -48 512
WIRE 80 528 80 512
FLAG 192 112 V+
FLAG 192 208 V-
FLAG 80 528 0
FLAG -48 528 0
FLAG -48 416 V+
FLAG 80 416 V-
FLAG -48 320 0
FLAG -48 112 0
FLAG 32 112 0
FLAG 272 16 y
FLAG 512 160 out
IOPIN 512 160 Out
FLAG 400 320 0
FLAG -16 176 in
FLAG 480 320 0
DATAFLAG 352 160 ""
SYMBOL voltage -48 416 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 80 416 R0
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL voltage -48 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 0 1n 1n 10u 20u)
SYMBOL Misc\\EuropeanResistor 144 -16 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rf
SYMATTR Value 100k
SYMBOL Misc\\EuropeanResistor -64 96 M180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R1
SYMATTR Value 33k
SYMBOL cap 160 -112 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName Cf
SYMATTR Value {CF}
SYMBOL cap 16 16 R0
SYMATTR InstName Ce
SYMATTR Value 33p
SYMBOL voltage 272 16 R0
SYMATTR InstName V4
SYMATTR Value ac 1
SYMBOL res 384 192 R0
SYMATTR InstName RL
SYMATTR Value 2k
SYMBOL cap 464 224 R0
SYMATTR InstName CL
SYMATTR Value 20p
SYMBOL Opamps\\LT1122 192 96 R0
SYMATTR InstName U2
TEXT -56 -392 Left 2 !.ac dec 100 1k 10meg
TEXT -64 -344 Left 2 !.step param CF list 1f 6p  12p
TEXT -56 -280 Left 2 ;.tran 0 20u 0 .01u
TEXT -56 -424 Left 2 ;Plot -V(out)/V(y) to get the loopgain
TEXT -56 -248 Left 2 !.options plotwinsize=0
TEXT 240 -536 Left 2 ;You can get the previous plot setup with\nPlot Setting -> Reload Plot Settings
TEXT -72 -536 Left 5 ;Loopgain
RECTANGLE Normal 248 -232 -72 -296 2
RECTANGLE Normal 376 -376 -72 -440 2
CIRCLE Normal 256 -80 128 -192 2