Version 4
SHEET 1 1100 964
WIRE 256 -80 112 -80
WIRE 416 -80 256 -80
WIRE 592 -80 592 -96
WIRE 592 -80 416 -80
WIRE 720 -80 592 -80
WIRE 256 -48 256 -80
WIRE 720 -48 720 -80
WIRE 592 -16 592 -80
WIRE 416 0 416 -80
WIRE 112 16 112 -80
WIRE 256 48 256 32
WIRE 352 48 256 48
WIRE 720 48 720 32
WIRE 592 64 592 -16
WIRE 256 112 256 48
WIRE 416 112 416 96
WIRE 528 112 416 112
WIRE 416 144 416 112
WIRE 0 160 -48 160
WIRE 32 160 0 160
WIRE 112 160 112 96
WIRE 112 160 96 160
WIRE 192 160 112 160
WIRE 592 176 592 160
WIRE 0 192 0 160
WIRE 112 192 112 160
WIRE 256 272 256 208
WIRE 288 272 256 272
WIRE 448 272 368 272
WIRE 464 272 448 272
WIRE 560 272 544 272
WIRE 592 272 592 256
WIRE 592 272 560 272
WIRE 640 272 592 272
WIRE 736 272 704 272
WIRE 848 272 736 272
WIRE 976 272 848 272
WIRE 0 288 0 272
WIRE 112 288 112 272
WIRE 592 288 592 272
WIRE 848 288 848 272
WIRE 256 304 256 272
WIRE 416 320 416 224
WIRE 592 384 592 368
WIRE 736 384 736 272
WIRE 976 384 976 272
WIRE 256 400 256 384
WIRE -144 416 -144 400
WIRE 848 416 848 368
WIRE 416 432 416 384
WIRE 528 432 416 432
WIRE -144 512 -144 496
WIRE 416 512 416 432
WIRE 736 512 736 464
WIRE 736 512 416 512
WIRE 848 512 848 480
WIRE 976 512 976 464
WIRE 976 512 848 512
WIRE 256 544 256 464
WIRE 592 544 592 480
WIRE 848 544 848 512
FLAG 112 288 0
FLAG 0 288 0
FLAG 256 544 0
FLAG 592 544 0
FLAG 848 544 0
FLAG 976 272 OUTPUT
FLAG 720 48 0
FLAG 592 -96 12V
FLAG -144 512 0
FLAG -144 400 INPUT
FLAG -48 160 INPUT
FLAG 448 272 A
FLAG 560 272 B
DATAFLAG 592 -16 "round(Ic(Q4)*1e5)/1e5"
SYMBOL res 96 0 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 96 176 R0
SYMATTR InstName R2
SYMATTR Value 150k
SYMBOL res -16 176 R0
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL cap 96 144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL npn 192 112 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL res 240 -64 R0
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL pnp 352 96 M180
SYMATTR InstName Q2
SYMATTR Value BC557B
SYMBOL res 400 128 R0
SYMATTR InstName R5
SYMATTR Value {RU}
SYMBOL res 240 288 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL cap 240 400 R0
SYMATTR InstName C2
SYMATTR Value 2µ2
SYMBOL res 384 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 8k2
SYMBOL diode 400 320 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL pnp 528 480 M180
SYMATTR InstName Q3
SYMATTR Value 2N2907
SYMBOL npn 528 64 R0
SYMATTR InstName Q4
SYMATTR Value 2N2222
SYMBOL res 576 272 R0
SYMATTR InstName R8
SYMATTR Value 1
SYMBOL res 576 160 R0
SYMATTR InstName R9
SYMATTR Value 1
SYMBOL cap 704 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 470µ
SYMBOL res 720 368 R0
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL res 832 272 R0
SYMATTR InstName R11
SYMATTR Value 10
SYMBOL cap 832 416 R0
SYMATTR InstName C4
SYMATTR Value 0.1µ
SYMBOL voltage 720 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 960 368 R0
SYMATTR InstName R12
SYMATTR Value 8
SYMBOL voltage -144 400 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 29 87 Left 2
SYMATTR Value2 AC 0
SYMATTR Value SINE(0 0.8 10k)
SYMATTR InstName V2
SYMBOL voltage 560 272 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 60 56 VTop 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 0
SYMATTR Value2 AC 1
TEXT -168 664 Left 2 !.OPTIONS plotwinsize=0 numdgt=15
TEXT -168 696 Left 2 !.four 10k V(OUTPUT)
TEXT -160 760 Left 2 ;.step dec param x 11 40k 10\n.noise V(OUTPUT) V2 dec 1000 10 {x}\n.measure ns integ V(inoise)\n.measure snr param 20*log10(ns)
TEXT -168 608 Left 2 ;.step dec param freq 100 40k 5
TEXT -168 632 Left 2 !.ac dec 1000 1 10000k
TEXT -168 720 Left 2 ;.tran 0 10m 0 10u
TEXT 264 680 Left 2 !.step param RU list 100 150
TEXT 264 640 Left 2 !.param RU=150
TEXT 656 648 Left 2 ;RU = 100Ohm Iq=181uA\nRU = 150Ohm Iq=13.5mA
TEXT 600 0 Left 2 ;Iq
LINE Normal 592 48 576 32
LINE Normal 608 32 592 48
CIRCLE Normal 496 256 368 128 2
CIRCLE Normal 560 736 240 592 2