Version 4 SHEET 1 2784 1856 WIRE 1296 176 1296 144 WIRE 1616 176 1616 144 WIRE 1296 288 1296 256 WIRE 1344 288 1296 288 WIRE 1616 288 1616 256 WIRE 1616 288 1568 288 WIRE 1296 336 1296 288 WIRE 1616 336 1616 288 WIRE 1024 384 992 384 WIRE 1072 384 1024 384 WIRE 1232 384 1152 384 WIRE 1760 384 1680 384 WIRE 592 432 592 352 WIRE 992 432 992 384 WIRE 1760 432 1760 384 WIRE 1296 480 1296 432 WIRE 1328 480 1296 480 WIRE 1456 480 1408 480 WIRE 1504 480 1456 480 WIRE 1616 480 1616 432 WIRE 1616 480 1584 480 WIRE 992 560 992 512 WIRE 1456 576 1456 480 WIRE 592 608 592 512 WIRE 1456 720 1456 656 FLAG 592 608 0 FLAG 592 352 VCC FLAG 1344 288 OUT2+ FLAG 1296 144 VCC FLAG 1616 144 VCC FLAG 1456 720 0 FLAG 1760 432 0 FLAG 992 560 0 FLAG 1024 384 S2 FLAG 1568 288 OUT2- SYMBOL voltage 592 416 R0 SYMATTR InstName Vps1 SYMATTR Value 10V SYMBOL npn 1232 336 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL npn 1680 336 M0 SYMATTR InstName Q4 SYMATTR Value 2N3904 SYMBOL res 1424 496 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName RE1 SYMATTR Value {RE_value} SYMBOL res 1600 496 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName RE2 SYMATTR Value {RE_value} SYMBOL res 1280 160 R0 SYMATTR InstName RC3 SYMATTR Value 10k SYMBOL res 1600 160 R0 SYMATTR InstName RC4 SYMATTR Value 10k SYMBOL current 1456 576 R0 SYMATTR InstName Ibias2 SYMATTR Value 1mA SYMBOL res 1168 400 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName RS2 SYMATTR Value 10k SYMBOL voltage 992 416 R0 WINDOW 123 24 118 Left 2 SYMATTR Value2 AC 1V 0 SYMATTR InstName Vs SYMATTR Value 0V TEXT 1392 864 Left 2 ;Spice Directive TEXT 536 856 Left 2 ;Power Supplies TEXT 1360 936 Left 2 !.AC DEC 10 1Hz 0.1GHz TEXT 1288 1000 Left 2 ;.STEP param RE_value LIST 1u 100 200 300 TEXT 1408 1056 Left 2 !.PARAM RE_value=100 TEXT 1152 928 Left 2 ;.OP