* Z:\home\khalils\Downloads\files\data\raw_asc\0cfd185cfdfc_Front_End.asc
* Generated by LTspice 26.0.1 for Windows.
* 0.001Hz cutoff RC values:\n10mF 16K\nThis gives ~6nV/rtHz noise down to 10mHz\nAdditionally down to ~3.5nV/rtHz with 2x fully-diff amp gain
* Library below included based on ModelFile attribute of instance XU1, XU2 (C:\users\khalils\AppData\Local\LTspice\lib\sym\OpAmps\ADA4528-2.asy)
* Library below included based on ModelFile attribute of instance XU3 (C:\users\khalils\AppData\Local\LTspice\lib\sym\OpAmps\LTC6362.asy)
;noise V(diffout) V3 dec 100 0.01 10k
R1 ampout N002 330
XU1 N005 N001 +2.5 -2.5 filterout ADA4528 ;pnba In+)In-)V+)V-)OUT
V2 0 -2.5 2.5
V3 N007 0 1 AC 1
R5 filterout N001 330
R6 N001 0 1
R2 N005 0 16K
R7 N009 N008 2K
C2 N005 N004 10m
R3 N001 N004 16K
R8 N008 0 1K
V4 +5 0 5
V1 +2.5 0 2.5
R9 diffout N003 2K
XU3 N003 N006 +5 diffout N009 0 NC_01 N008 LTC6362 ;pnba IN-)VOCM)V+)OUT+)OUT-)V-)SHDN)IN+
R10 N003 ampout 1K
XU2 filterout N002 +2.5 -2.5 ampout ADA4528 ;pnba In+)In-)V+)V-)OUT
V6 N006 0 2.5V
C1 N004 N007 10m
R4 0 N002 1
.ac dec 100 0.01 10k
.lib ADI.lib
.lib LTC7.lib
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 2228 736
WIRE 256 -144 224 -144
WIRE 384 -144 336 -144
WIRE 416 -144 384 -144
WIRE 560 -144 496 -144
WIRE 576 -144 560 -144
WIRE 672 -144 656 -144
WIRE 784 -144 752 -144
WIRE 832 -144 784 -144
WIRE 976 -144 912 -144
WIRE 1024 -144 976 -144
WIRE 1136 -144 1104 -144
WIRE 1200 -144 1136 -144
WIRE 1328 -144 1280 -144
WIRE -192 -128 -240 -128
WIRE -416 -96 -480 -96
WIRE 656 -96 656 -144
WIRE -240 -80 -240 -128
WIRE 896 -64 848 -64
WIRE -480 -48 -480 -96
WIRE 496 -48 448 -48
WIRE 256 -32 208 -32
WIRE 384 -32 384 -144
WIRE 384 -32 336 -32
WIRE 1248 -32 1200 -32
WIRE 848 -16 848 -64
WIRE 448 0 448 -48
WIRE 784 0 784 -144
WIRE 816 0 784 0
WIRE 1200 0 1200 -32
WIRE 384 16 384 -32
WIRE 416 16 384 16
WIRE 976 16 976 -144
WIRE 976 16 880 16
WIRE -240 32 -240 0
WIRE -240 32 -304 32
WIRE 576 32 576 -144
WIRE 576 32 480 32
WIRE 816 32 576 32
WIRE -304 48 -304 32
WIRE 416 48 384 48
WIRE 1136 48 1136 -144
WIRE 1168 48 1136 48
WIRE 1328 48 1328 -144
WIRE -240 64 -240 32
WIRE -480 80 -480 32
WIRE 1168 80 1040 80
WIRE 96 96 32 96
WIRE 208 96 208 -32
WIRE 208 96 160 96
WIRE 256 96 208 96
WIRE 384 96 384 48
WIRE 384 96 320 96
WIRE 848 96 848 48
WIRE 896 96 848 96
WIRE 448 112 448 64
WIRE 496 112 448 112
WIRE 1040 112 1040 80
WIRE 1168 112 1136 112
WIRE 32 160 32 96
WIRE 384 160 384 96
WIRE -240 176 -240 144
WIRE -176 176 -240 176
WIRE 1200 208 1200 160
WIRE 1040 224 1040 192
WIRE 32 272 32 240
WIRE 384 272 384 240
WIRE 1024 336 992 336
WIRE 1136 336 1136 112
WIRE 1136 336 1104 336
WIRE 1200 336 1136 336
WIRE 1328 336 1328 112
WIRE 1328 336 1280 336
WIRE 992 368 992 336
SYMBOL voltage 32 144 R0
WINDOW 123 44 52 Left 2
WINDOW 39 0 0 Left 0
WINDOW 3 43 78 Left 2
WINDOW 0 43 26 Left 2
SYMATTR Value2 AC 1
SYMATTR Value 1
SYMATTR InstName V3
SYMBOL voltage -480 -64 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 5
SYMBOL OpAmps\\ADA4528-2 848 -48 R0
SYMATTR InstName U2
SYMBOL res 1120 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 1K
SYMBOL cap 320 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10m
SYMBOL res 352 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1
SYMBOL res 928 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 330
SYMBOL res 1296 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 2K
SYMBOL cap 160 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10m
SYMBOL res 512 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 330
SYMBOL voltage -240 -96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 2.5
SYMBOL OpAmps\\ADA4528-2 448 -32 R0
SYMATTR InstName U1
SYMBOL res 352 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 16K
SYMBOL res 1296 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 2K
SYMBOL res 1120 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 1K
SYMBOL res 368 144 R0
SYMATTR InstName R2
SYMATTR Value 16K
SYMBOL res 656 -128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 1
SYMBOL OpAmps\\LTC6362 1232 80 R0
WINDOW 3 115 25 Left 2
SYMATTR InstName U3
SYMBOL voltage 1040 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V6
SYMATTR Value 2.5V
SYMBOL voltage -240 48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 2.5
FLAG -304 48 0
FLAG 496 -48 +2.5
FLAG 496 112 -2.5
FLAG -176 176 -2.5
FLAG -192 -128 +2.5
FLAG 32 272 0
FLAG 384 272 0
FLAG 560 -144 filterout
FLAG 224 -144 0
FLAG -416 -96 +5
FLAG 896 -64 +2.5
FLAG 896 96 -2.5
FLAG 656 -96 0
FLAG 976 -144 ampout
FLAG 1040 224 0
FLAG 992 368 0
FLAG 1200 208 0
FLAG 1248 -32 +5
FLAG 1328 -144 diffout
FLAG -480 80 0
TEXT 1504 32 Left 2 !.ac dec 100 0.01 10k
TEXT 1504 0 Left 2 !;noise V(diffout) V3 dec 100 0.01 10k
TEXT 1504 -136 Left 2 ;0.001Hz cutoff RC values:\n10mF 16K\nThis gives ~6nV/rtHz noise down to 10mHz\nAdditionally down to ~3.5nV/rtHz with 2x fully-diff amp gain