Version 4
SHEET 1 880 680
WIRE -128 80 -192 80
WIRE 0 80 -48 80
WIRE 112 80 0 80
WIRE 272 80 192 80
WIRE -192 160 -192 80
WIRE 80 192 80 176
WIRE 0 208 0 80
WIRE 48 208 0 208
WIRE 144 224 112 224
WIRE 272 224 272 80
WIRE 272 224 224 224
WIRE 336 224 272 224
WIRE 416 224 336 224
WIRE 48 240 0 240
WIRE 416 240 416 224
WIRE -192 272 -192 240
WIRE 0 272 0 240
WIRE 80 272 80 256
WIRE 416 352 416 320
WIRE -192 400 -192 384
WIRE -64 400 -64 384
WIRE -192 496 -192 480
WIRE -64 496 -64 480
FLAG 0 272 0
FLAG -192 272 0
FLAG 336 224 output
FLAG 416 352 0
FLAG 80 176 +V
FLAG 80 272 -V
FLAG -64 496 0
FLAG -192 496 0
FLAG -192 384 +V
FLAG -64 384 -V
SYMBOL res -32 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1.1k
SYMBOL res 208 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName feedback
SYMATTR Value 10k
SYMBOL res 240 208 R90
WINDOW 0 -14 27 VRight 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName z_out
SYMATTR Value 100
SYMBOL current 416 320 M180
WINDOW 0 24 88 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 24 -28 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value 0
SYMATTR Value2 AC 1
SYMBOL voltage -192 144 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 0
SYMATTR Value2 AC 0
SYMBOL Opamps\\UniversalOpamp2 80 224 R0
SYMATTR InstName U1
SYMATTR SpiceModel level.3a
SYMATTR Value2 Avol=1Meg GBW=1Meg Slew=1Meg
SYMBOL voltage -192 384 R0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage -64 384 R0
SYMATTR InstName V3
SYMATTR Value -12
TEXT -128 -56 Left 2 !.lib opamp.sub
TEXT -128 -24 Left 2 !.ac dec 100 1k 1e7
TEXT -128 -112 Left 2 ;Zout=V(output)/1A
TEXT -128 -160 Left 2 ;Plot V(output)/1A to get the ouput impedance.
RECTANGLE Normal 240 304 32 128 2