Version 4
SHEET 1 1812 1120
WIRE -32 720 -32 752
WIRE -32 624 -32 640
WIRE 640 624 688 624
WIRE 272 624 352 624
WIRE 208 800 208 688
WIRE 512 624 480 624
WIRE 736 624 768 624
WIRE 768 624 768 640
WIRE 768 720 768 800
WIRE 144 624 96 624
WIRE 96 624 -32 624
WIRE 208 800 368 800
WIRE 496 800 688 800
WIRE 688 800 688 624
WIRE 688 624 736 624
FLAG -32 752 0
FLAG 768 800 0
FLAG 736 624 vs
FLAG 96 624 Ve
SYMBOL res 784 736 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R1
SYMATTR Value 1K
SYMBOL voltage -32 624 R0
WINDOW 123 2 -40 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 2 -73 Left 0
SYMATTR Value2 AC 1
SYMATTR Value PULSE(0 1 2m 1n 1n 40m  80m)
SYMATTR InstName V1
SYMBOL SP_symb\\diff1 256 576 R0
SYMATTR InstName U3
SYMBOL SP_symb\\retardpur 576 624 R0
WINDOW 39 -50 69 Left 0
WINDOW 38 -48 31 Left 0
SYMATTR SpiceLine tau=2m
SYMATTR InstName U5
SYMBOL SP_symb\\gain 384 752 M0
WINDOW 39 -94 49 Left 0
SYMATTR SpiceLine G={h}
SYMATTR InstName U2
SYMBOL SP_symb\\gain 464 576 R0
WINDOW 39 -114 115 Left 0
SYMATTR SpiceLine G={gain}
SYMATTR InstName U1
TEXT -64 968 Left 0 !.include SP.lib
TEXT -64 904 Left 0 !.ac dec 1000 10 1k
TEXT -64 936 Left 0 !;tran 0 80m 0 10u
TEXT -64 800 Left 0 !.param h  0
TEXT -64 832 Left 0 !.step param gain list 0.8 1 1.1
TEXT -64 864 Left 0 !;.param gain 0.8