Version 4 SHEET 1 1388 968 WIRE 592 128 592 48 WIRE 864 128 864 64 WIRE -208 160 -208 96 WIRE 496 176 368 176 WIRE 528 176 496 176 WIRE 960 176 928 176 WIRE 1072 176 960 176 WIRE 96 224 96 160 WIRE 368 224 368 176 WIRE 1072 224 1072 176 WIRE 256 240 240 240 WIRE 320 240 256 240 WIRE 1168 240 1120 240 WIRE 1184 240 1168 240 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 -208 288 -208 240 WIRE -208 288 -272 288 WIRE -272 304 -272 288 WIRE -208 336 -208 288 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 96 368 96 304 WIRE 480 400 480 336 WIRE 720 400 720 272 WIRE -208 480 -208 416 WIRE 720 512 720 480 WIRE 480 528 480 480 FLAG 592 48 VCC FLAG 720 512 VEE FLAG -272 304 0 FLAG -208 96 VCC FLAG -208 480 VEE FLAG 736 272 E FLAG 864 64 VCC FLAG 496 176 IN+ FLAG 960 176 IN- FLAG 480 528 0 FLAG 320 336 0 FLAG 1120 336 0 FLAG 256 240 VD FLAG 1168 240 VD FLAG 624 336 VCM FLAG 96 368 0 FLAG 96 160 VD SYMBOL voltage -208 144 R0 SYMATTR InstName Vps1 SYMATTR Value 15V SYMBOL npn 528 128 R0 WINDOW 3 81 90 Left 2 SYMATTR Value npn_transistor SYMATTR InstName Q1 SYMBOL voltage -208 320 R0 SYMATTR InstName Vps2 SYMATTR Value 15V SYMBOL npn 928 128 M0 WINDOW 3 95 8 Left 2 SYMATTR Value npn_transistor 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 e 368 208 R0 SYMATTR InstName E1 SYMATTR Value 0.5 SYMBOL e 1072 208 M0 SYMATTR InstName E2 SYMATTR Value -0.5 SYMBOL voltage 96 208 R0 WINDOW 0 -62 21 Left 2 WINDOW 3 -61 97 Left 2 SYMATTR InstName Vd SYMATTR Value 0V TEXT 464 880 Left 2 ;.OP TEXT 120 616 Left 2 !.model npn_transistor npn ( Is=14fA Bf=100 VAf=100V ) TEXT 320 688 Left 2 !.DC Vcm -5V +5V 100mV TEXT 320 840 Left 2 ;.DC Vd -500mV +500mV 10mV