Version 4
SHEET 1 1100 712
WIRE 256 -80 112 -80
WIRE 384 -80 256 -80
WIRE 544 -80 544 -96
WIRE 544 -80 384 -80
WIRE 256 -48 256 -80
WIRE 384 0 384 -80
WIRE 112 16 112 -80
WIRE 256 48 256 32
WIRE 320 48 256 48
WIRE 544 64 544 -80
WIRE 256 112 256 48
WIRE 384 112 384 96
WIRE 480 112 384 112
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 384 176 384 112
WIRE 544 176 544 160
WIRE 0 192 0 160
WIRE 112 192 112 160
WIRE -448 240 -448 224
WIRE -352 240 -352 224
WIRE 256 272 256 208
WIRE 272 272 256 272
WIRE 544 272 544 256
WIRE 544 272 352 272
WIRE 592 272 544 272
WIRE 688 272 656 272
WIRE 752 272 688 272
WIRE 848 272 752 272
WIRE 912 272 848 272
WIRE 0 288 0 272
WIRE 112 288 112 272
WIRE 544 288 544 272
WIRE 848 288 848 272
WIRE 256 304 256 272
WIRE 384 320 384 256
WIRE -448 336 -448 320
WIRE -352 336 -352 320
WIRE 544 384 544 368
WIRE 688 384 688 272
WIRE 752 384 752 272
WIRE 256 400 256 384
WIRE 848 416 848 368
WIRE 384 432 384 384
WIRE 480 432 384 432
WIRE 384 512 384 432
WIRE 688 512 688 464
WIRE 688 512 384 512
WIRE 752 512 752 464
WIRE 848 512 848 480
WIRE 848 512 752 512
WIRE 256 544 256 464
WIRE 544 544 544 480
WIRE 848 544 848 512
FLAG 112 288 0
FLAG 0 288 0
FLAG 256 544 0
FLAG 544 544 0
FLAG 848 544 0
FLAG 912 272 OUTPUT
FLAG -352 224 12V
FLAG -352 336 0
FLAG 544 -96 12V
FLAG -448 336 0
FLAG -448 224 INPUT
FLAG -48 160 INPUT
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 BC548A
SYMBOL res 240 -64 R0
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL pnp 320 96 M180
SYMATTR InstName Q2
SYMATTR Value BC558A
SYMBOL res 368 160 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL res 240 288 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL cap 240 400 R0
SYMATTR InstName C2
SYMATTR Value 2µ2
SYMBOL res 368 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 8k2
SYMBOL diode 368 320 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL pnp 480 480 M180
SYMATTR InstName Q3
SYMATTR Value BC327-40
SYMBOL npn 480 64 R0
SYMATTR InstName Q4
SYMATTR Value BC337-40
SYMBOL res 528 272 R0
SYMATTR InstName R8
SYMATTR Value 1
SYMBOL res 528 160 R0
SYMATTR InstName R9
SYMATTR Value 1
SYMBOL cap 656 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 470µ
SYMBOL res 672 368 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 -352 224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 736 368 R0
SYMATTR InstName R12
SYMATTR Value 8
SYMBOL voltage -448 224 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 24 44 Left 2
SYMATTR Value2 AC 0.001
SYMATTR InstName V2
SYMATTR Value SINE(0 0.8 10k)
TEXT -560 496 Left 2 !.OPTIONS plotwinsize=0 numdgt=15
TEXT -560 528 Left 2 !.four 10k V(OUTPUT)
TEXT -552 592 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 -560 440 Left 2 ;.step dec param freq 100 40k 5
TEXT -562 464 Left 2 !.ac dec 1000 1 40k