Version 4
SHEET 1 880 748
WIRE -16 368 -16 352
WIRE 384 192 400 192
WIRE 432 192 432 208
WIRE 432 272 432 304
WIRE 400 192 432 192
WIRE 512 352 512 192
WIRE 512 192 432 192
WIRE 0 192 -16 192
WIRE 64 256 64 352
WIRE 272 192 288 192
WIRE 128 192 144 192
WIRE 288 192 304 192
WIRE 368 352 512 352
WIRE 240 352 64 352
WIRE -16 272 -16 192
FLAG -16 368 0
FLAG 432 304 0
FLAG 288 192 Vrcbf
FLAG 400 192 Vsbf
SYMBOL voltage -16 256 R0
WINDOW 3 -380 202 Left 0
WINDOW 123 -312 19 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 1 5m 1n 1n 10m 20m)
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMBOL res 400 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL cap 416 208 R0
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL SP_symb\\diff1 112 144 R0
WINDOW 3 -29 109 Left 0
SYMATTR InstName U1
SYMBOL SP_symb\\gain 256 144 R0
WINDOW 3 -91 46 Left 0
WINDOW 39 -110 111 Left 0
SYMATTR SpiceLine G={Gbo + 1}
SYMATTR InstName U2
SYMBOL SP_symb\\gain 256 304 M0
WINDOW 3 -91 49 Left 0
WINDOW 39 -44 86 Left 0
SYMATTR SpiceLine G=1-1/({Gbo + 1})
SYMATTR InstName U3
TEXT -328 240 Left 0 !.tran 0 20m 0 1u
TEXT -328 352 Left 0 !.include SP.lib
TEXT -328 416 Left 0 !.step param Gbo 0 10 5
TEXT -328 200 Left 0 !;ac dec 100 10 10k