Version 4 SHEET 1 1480 1096 WIRE 720 -48 272 -48 WIRE 272 16 272 -48 WIRE 272 160 272 96 WIRE -64 224 -128 224 WIRE 80 224 16 224 WIRE -272 304 -288 304 WIRE -128 304 -128 224 WIRE -128 304 -272 304 WIRE 80 304 80 224 WIRE 160 304 80 304 WIRE 272 304 272 224 WIRE 272 304 160 304 WIRE 496 304 272 304 WIRE 720 304 720 -48 WIRE 720 304 576 304 WIRE 976 304 720 304 WIRE 576 336 576 304 WIRE 496 352 496 304 WIRE 528 352 496 352 WIRE -128 384 -128 304 WIRE -64 384 -128 384 WIRE 80 384 80 304 WIRE 80 384 0 384 WIRE 528 400 496 400 WIRE -288 416 -288 304 WIRE 496 432 496 400 WIRE 496 432 272 432 WIRE 576 432 576 416 WIRE 272 528 272 432 WIRE 432 528 272 528 WIRE 720 528 720 304 WIRE 720 528 512 528 WIRE -288 608 -288 496 WIRE 384 640 336 640 WIRE 496 640 448 640 WIRE 272 688 272 528 WIRE 336 688 336 640 WIRE 336 688 272 688 WIRE 496 688 496 640 WIRE 560 688 496 688 WIRE 720 688 720 528 WIRE 720 688 640 688 WIRE 272 736 272 688 WIRE 336 736 336 688 WIRE 384 736 336 736 WIRE 496 736 496 688 WIRE 496 736 448 736 WIRE 272 848 272 816 FLAG -288 608 0 FLAG 160 304 Fdbk_bar FLAG -272 304 IN FLAG 976 304 OUT FLAG 576 432 0 FLAG 272 848 0 DATAFLAG 848 304 "$" DATAFLAG 432 304 "$" DATAFLAG -176 304 "$" SYMBOL cap 256 160 R0 SYMATTR InstName C1 SYMATTR Value 16nF SYMBOL cap 0 368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 16nF SYMBOL res 256 0 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -80 240 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL voltage -288 400 R0 WINDOW 123 -157 115 Left 2 WINDOW 0 -70 28 Left 2 WINDOW 3 -72 81 Left 2 SYMATTR Value2 AC 1V 0deg SYMATTR InstName Vs SYMATTR Value 0V SYMBOL diode 448 720 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 384 624 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL res 256 720 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res 656 672 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName Rlimit SYMATTR Value 100k SYMBOL e 576 320 R0 SYMATTR InstName E1 SYMATTR Value 1e6 SYMBOL res 528 512 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value {R4_value} TEXT -608 856 Left 2 ;.AC DEC 10000 1Hz 100MegHz TEXT -688 1016 Left 2 ;.STEP param R4_value LIST 15k 20k 23k 25k TEXT -568 968 Left 2 !.PARAM R4_value=23k TEXT -520 712 Left 2 ;Spice Directives TEXT -600 904 Left 2 !.TRAN 100us 100ms 0 100us TEXT -456 752 Left 2 !.OP TEXT -536 792 Left 2 !.IC V(Fdbk_bar)=1V