Version 4 SHEET 1 1340 680 WIRE -1024 -208 -1056 -208 WIRE -896 -208 -944 -208 WIRE -816 -208 -896 -208 WIRE -704 -208 -816 -208 WIRE -704 -176 -704 -208 WIRE -64 -128 -64 -160 WIRE -896 -96 -896 -208 WIRE -816 -96 -816 -208 WIRE 240 -80 192 -80 WIRE 352 -80 320 -80 WIRE 400 -80 352 -80 WIRE -704 -64 -704 -96 WIRE -592 -64 -704 -64 WIRE -512 -64 -592 -64 WIRE -416 -64 -512 -64 WIRE 656 -64 624 -64 WIRE 768 -64 736 -64 WIRE 800 -64 768 -64 WIRE -704 -32 -704 -64 WIRE -592 -32 -592 -64 WIRE -512 -32 -512 -64 WIRE -64 -16 -64 -48 WIRE 240 48 240 32 WIRE -32 64 -64 64 WIRE 0 64 -32 64 WIRE 80 64 64 64 WIRE 192 64 192 -80 WIRE 192 64 160 64 WIRE 224 64 192 64 WIRE 672 64 672 48 WIRE -896 80 -896 -32 WIRE -816 80 -816 -32 WIRE -816 80 -896 80 WIRE -704 80 -704 48 WIRE -704 80 -816 80 WIRE -592 80 -592 32 WIRE -592 80 -704 80 WIRE -512 80 -512 32 WIRE -512 80 -592 80 WIRE 352 80 352 -80 WIRE 352 80 288 80 WIRE 416 80 352 80 WIRE 512 80 480 80 WIRE 624 80 624 -64 WIRE 624 80 592 80 WIRE 656 80 624 80 WIRE 224 96 208 96 WIRE 768 96 768 -64 WIRE 768 96 720 96 WIRE 832 96 768 96 WIRE 944 96 896 96 WIRE 1040 96 944 96 WIRE 1072 96 1040 96 WIRE -512 112 -512 80 WIRE 656 112 640 112 WIRE 240 128 240 112 WIRE -64 144 -64 64 WIRE 672 144 672 128 WIRE 944 144 944 96 WIRE 1040 144 1040 96 WIRE 208 176 208 96 WIRE 208 176 176 176 WIRE 544 224 496 224 WIRE 640 224 640 112 WIRE 640 224 624 224 WIRE 656 224 640 224 WIRE 768 224 736 224 WIRE -64 256 -64 224 WIRE 944 256 944 208 WIRE 1040 256 1040 224 WIRE 1040 256 944 256 WIRE 768 272 768 224 WIRE 1040 288 1040 256 FLAG -1056 48 SIG+NOISE FLAG -64 -160 3.3V FLAG -64 -16 0 FLAG -1056 -208 3.3V FLAG -512 112 0 FLAG -416 -64 V_MID FLAG -64 256 0 FLAG 176 176 V_MID FLAG -32 64 SIG FLAG 400 -80 MIC FLAG 240 128 0 FLAG 240 32 3.3V FLAG 1040 288 0 FLAG 1072 96 MIC_LPF FLAG 496 224 3.3V FLAG 768 272 0 FLAG 672 144 0 FLAG 672 48 3.3V FLAG -1040 176 0 FLAG 800 -64 PD_IN SYMBOL Misc\\signal -1040 80 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PWL file=2mvpp_noise.txt SYMBOL voltage -64 -144 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 3.3 SYMBOL cap -912 -96 R0 SYMATTR InstName C1 SYMATTR Value 1uF SYMBOL cap -832 -96 R0 SYMATTR InstName C2 SYMATTR Value 100nF SYMBOL res -720 -192 R0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res -720 -48 R0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL ind -928 -224 R90 WINDOW 0 5 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName L1 SYMATTR Value 10uH SYMATTR SpiceLine Rser=10 SYMBOL cap -608 -32 R0 SYMATTR InstName C3 SYMATTR Value 1uF SYMBOL cap -528 -32 R0 SYMATTR InstName C4 SYMATTR Value 100nF SYMBOL Opamps\\LTC6255 256 80 R0 SYMATTR InstName U1 SYMBOL Misc\\signal -64 128 R0 WINDOW 123 24 132 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PWL file=sig.txt SYMATTR Value2 AC 1 SYMBOL cap 64 48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 10uF SYMBOL res 176 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL res 336 -96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 100k SYMBOL cap 480 64 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 1uF SYMBOL Opamps\\LTC6255 688 96 R0 SYMATTR InstName U2 SYMBOL res 608 64 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value {R_xa} SYMBOL res 752 -80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value {R_a} SYMBOL diode 832 112 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL cap 928 144 R0 SYMATTR InstName C7 SYMATTR Value 1uF SYMBOL res 1024 128 R0 SYMATTR InstName R7 SYMATTR Value 100k SYMBOL res 640 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL res 752 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 1k TEXT 158 -212 Left 2 !.tran 5e-2 TEXT 160 -184 Left 2 !.param a = 0.5, R = 10k, R_a = {{R}*{a}}, R_xa = {{R}*{1-{a}}} TEXT 160 -152 Left 2 ;.step param a list 0.3, 0.5, 0.9 TEXT 1128 176 Left 2 ;f_c = 1.59 Hz