Version 4 SHEET 1 1388 1008 WIRE 592 -32 592 -80 WIRE 864 -16 864 -80 WIRE 112 80 112 16 WIRE 592 80 592 48 WIRE 656 80 592 80 WIRE 864 80 864 64 WIRE 864 80 800 80 WIRE -144 96 -144 32 WIRE 592 128 592 80 WIRE 864 128 864 80 WIRE 496 176 368 176 WIRE 528 176 496 176 WIRE 960 176 928 176 WIRE 1072 176 960 176 WIRE -144 224 -144 176 WIRE -144 224 -208 224 WIRE 112 224 112 160 WIRE 368 224 368 176 WIRE 1072 224 1072 176 WIRE -208 240 -208 224 WIRE 320 240 256 240 WIRE 1168 240 1120 240 WIRE 1184 240 1168 240 WIRE -144 272 -144 224 WIRE 592 272 592 224 WIRE 720 272 592 272 WIRE 736 272 720 272 WIRE 864 272 864 224 WIRE 864 272 736 272 WIRE 320 336 320 288 WIRE 368 336 368 304 WIRE 480 336 368 336 WIRE 624 336 480 336 WIRE 1072 336 1072 304 WIRE 1072 336 624 336 WIRE 1120 336 1120 288 WIRE 720 368 720 272 WIRE 864 368 720 368 WIRE 480 400 480 336 WIRE 720 400 720 368 WIRE 864 400 864 368 WIRE -144 416 -144 352 WIRE 480 528 480 480 WIRE 720 528 720 480 WIRE 864 528 864 480 WIRE 864 528 720 528 WIRE 720 560 720 528 FLAG 592 -80 VCC FLAG 720 560 VEE FLAG -208 240 0 FLAG -144 32 VCC FLAG -144 416 VEE FLAG 736 272 E FLAG 864 -80 VCC FLAG 496 176 IN+ FLAG 960 176 IN- FLAG 480 528 0 FLAG 112 224 0 FLAG 320 336 0 FLAG 1120 336 0 FLAG 256 240 VD FLAG 1168 240 VD FLAG 624 336 VCM FLAG 800 80 OUT+ FLAG 656 80 OUT- FLAG 112 16 VD SYMBOL voltage -144 80 R0 SYMATTR InstName Vps1 SYMATTR Value 15V SYMBOL npn 528 128 R0 WINDOW 3 81 90 Left 2 SYMATTR Value npn_transistor1 SYMATTR InstName Q1 SYMBOL voltage -144 256 R0 SYMATTR InstName Vps2 SYMATTR Value 15V SYMBOL npn 928 128 M0 WINDOW 3 95 8 Left 2 SYMATTR Value npn_transistor2 SYMATTR InstName Q2 SYMBOL current 720 400 R0 SYMATTR InstName I1 SYMATTR Value 1mA SYMBOL voltage 480 384 R0 WINDOW 0 -55 14 Left 2 WINDOW 3 -53 96 Left 2 SYMATTR InstName Vcm SYMATTR Value 0V SYMBOL voltage 112 64 R0 WINDOW 0 -76 18 Left 2 WINDOW 3 -53 96 Left 2 WINDOW 123 -148 126 Left 2 SYMATTR InstName Vd SYMATTR Value 0V SYMATTR Value2 AC 1V 0deg SYMBOL e 368 208 R0 SYMATTR InstName EV+ SYMATTR Value 0.5 SYMBOL e 1072 208 M0 SYMATTR InstName EV- SYMATTR Value -0.5 SYMBOL res 576 -48 R0 SYMATTR InstName Rc1 SYMATTR Value {mc(10k,0.0)} SYMBOL res 848 -32 R0 SYMATTR InstName Rc2 SYMATTR Value {mc(10k,0.0)} SYMBOL res 848 384 R0 SYMATTR InstName Ro SYMATTR Value 200k TEXT -264 720 Left 2 !.model npn_transistor1 npn ( Is=14fA Bf={mc(100,0.05)} VAf=100V ) TEXT 792 752 Left 2 !.STEP param RUN 1 101 1 TEXT 896 712 Left 2 !.OP TEXT -256 768 Left 2 !.model npn_transistor2 npn ( Is=14fA Bf={mc(100,0.05)} VAf=100V ) TEXT 840 664 Left 2 ;Spice Directives TEXT 8 672 Left 2 ;Device Models