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352 752 WIRE 352 816 352 752 WIRE -2240 832 -2240 688 WIRE -1264 832 -2240 832 WIRE 16 832 16 -544 WIRE 16 832 -624 832 WIRE 352 960 352 896 WIRE 576 960 352 960 WIRE 352 992 352 960 WIRE -3584 1056 -3584 688 WIRE 352 1120 352 1072 WIRE 576 1120 352 1120 WIRE 352 1168 352 1120 FLAG -1264 832 VGND IOPIN -1264 832 In FLAG 208 -1072 V+ IOPIN 208 -1072 In FLAG 176 -816 AGND IOPIN 176 -816 In FLAG 400 -944 out1 FLAG 352 1168 0 FLAG 576 752 V+ IOPIN 576 752 Out FLAG 576 960 VGND IOPIN 576 960 Out FLAG 576 1120 AGND IOPIN 576 1120 Out FLAG 400 -576 AGND IOPIN 400 -576 In FLAG 240 -848 VGND IOPIN 240 -848 In FLAG -3584 1056 mains_gnd IOPIN -3584 1056 In FLAG -2464 -1472 ch1 FLAG -2464 -1040 ch2 FLAG -2464 -144 ch4 FLAG -2464 -560 ch3 FLAG -1392 -1376 0 FLAG -1136 -1312 0 FLAG -1392 -944 0 FLAG -1136 -880 0 FLAG -1392 -464 0 FLAG -1136 -400 0 FLAG -1392 -48 0 FLAG -1136 16 0 FLAG -1248 -1424 addr_0 FLAG -1248 -992 addr_1 FLAG -1248 -512 addr_2 FLAG -1248 -96 addr_3 FLAG 1680 -1408 0 FLAG 1936 -1344 0 FLAG 1680 -976 0 FLAG 1936 -912 0 FLAG 1680 -496 0 FLAG 1936 -432 0 FLAG 1680 -80 0 FLAG 1936 -16 0 FLAG 1824 -1456 seq1_b FLAG 1824 -1024 seq2_b FLAG 1824 -544 seq3_b FLAG 1824 -128 seq4_b FLAG 2448 -1296 AGND IOPIN 2448 -1296 Out FLAG 2448 -864 AGND IOPIN 2448 -864 Out FLAG 2448 -384 AGND IOPIN 2448 -384 Out FLAG 2448 32 AGND IOPIN 2448 32 Out FLAG -1824 -1264 VGND IOPIN -1824 -1264 Out FLAG -1824 -832 VGND IOPIN -1824 -832 Out FLAG -1824 -352 VGND IOPIN -1824 -352 Out FLAG -1824 64 VGND IOPIN -1824 64 Out FLAG -3152 -928 tss_10Hz_sine+bias FLAG -3072 -576 tss_8Hz_rectangular-bias FLAG 2608 -1504 ch1_demuxed IOPIN 2608 -1504 Out FLAG 2608 -1072 ch2_demuxed IOPIN 2608 -1072 Out FLAG 2608 -592 ch3_demuxed IOPIN 2608 -592 Out FLAG 2608 -176 ch4_demuxed IOPIN 2608 -176 Out FLAG 1216 -944 ADC0 FLAG -1824 480 VGND IOPIN -1824 480 Out SYMBOL Misc\\signal -3424 -1808 M270 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 29 20 VLeft 0 WINDOW 3 68 133 VLeft 0 SYMATTR InstName V_ac1 SYMATTR Value SINE(0 24mV 10) SYMBOL Opamps\\LT1168 208 -944 R0 SYMATTR InstName U3 SYMBOL res -128 -688 R0 SYMATTR InstName R8 SYMATTR Value 470 SYMBOL voltage 352 800 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 3.5V SYMBOL voltage 352 976 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 2V SYMBOL res 384 -752 R0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL res -2896 -1584 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_3 SYMATTR Value 18k SYMBOL voltage -3424 -1680 M270 WINDOW 0 -106 31 VTop 0 WINDOW 3 -36 57 VBottom 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_battery1 SYMATTR Value 1.5V SYMBOL res -2672 -1584 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_4 SYMATTR Value 270k SYMBOL Misc\\signal -3440 688 M270 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 29 20 VLeft 0 WINDOW 3 71 100 VLeft 0 SYMATTR InstName V_ac_line_hum SYMATTR Value SINE(0 0mV 50) SYMBOL res -3168 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_13 SYMATTR Value 18k SYMBOL res -3232 -1696 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_1 SYMATTR Value 1.8k SYMBOL res -3168 -1792 R0 SYMATTR InstName R_tss_2 SYMATTR Value 270k SYMBOL Misc\\signal -3424 -1376 M270 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 29 20 VLeft 0 WINDOW 3 72 117 VLeft 0 SYMATTR InstName V_ac2 SYMATTR Value PULSE(-24mV 24mV 0 1us 1us 62.5ms 125ms) SYMBOL res -2896 -1152 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_7 SYMATTR Value 18k SYMBOL voltage -3536 -1248 M90 WINDOW 0 69 66 VTop 0 WINDOW 3 74 56 VBottom 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_battery2 SYMATTR Value 1.5V SYMBOL res -2672 -1152 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_8 SYMATTR Value 270k SYMBOL res -3232 -1264 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_5 SYMATTR Value 1.8k SYMBOL res -3088 -1376 R0 SYMATTR InstName R_tss_6 SYMATTR Value 270k SYMBOL res -2880 704 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R_tss_14 SYMATTR Value 18k SYMBOL res -2880 -272 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_11 SYMATTR Value 18k SYMBOL res -2656 -272 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_12 SYMATTR Value 270k SYMBOL res -2896 -672 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_9 SYMATTR Value 18k SYMBOL res -2672 -672 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_10 SYMATTR Value 270k SYMBOL sw -1424 -1472 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S1 SYMATTR Value analog_sw SYMBOL voltage -1136 -1440 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -92 199 Left 0 SYMATTR Value PULSE(0 5 0ms 1ns 1ns {t_sample} {t_period}) SYMATTR InstName V_sequence1 SYMBOL sw -1424 -1040 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S2 SYMATTR Value analog_sw SYMBOL voltage -1136 -1008 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -130 203 Left 0 SYMATTR Value PULSE(0 5 {delay2} 1ns 1ns {t_sample} {t_period}) SYMATTR InstName V_sequence2 SYMBOL sw -1424 -560 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S3 SYMATTR Value analog_sw SYMBOL voltage -1136 -528 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -132 202 Left 0 SYMATTR Value PULSE(0 5 {delay3} 1ns 1ns {t_sample} {t_period}) SYMATTR InstName V_sequence3 SYMBOL sw -1424 -144 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S4 SYMATTR Value analog_sw SYMBOL voltage -1136 -112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 3 -129 203 Left 0 SYMATTR Value PULSE(0 5 {delay4} 1ns 1ns {t_sample} {t_period}) SYMATTR InstName V_sequence4 SYMBOL cap -1696 -1488 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C_hp_1 SYMATTR Value 200nF SYMBOL cap -1696 -1056 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C_hp_2 SYMATTR Value 200nF SYMBOL cap -1696 -576 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C_hp_3 SYMATTR Value 200nF SYMBOL cap -1696 -160 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C_hp_4 SYMATTR Value 200nF SYMBOL res -384 -1008 R0 SYMATTR InstName R_hp SYMATTR Value 10meg SYMBOL sw 1648 -1504 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S5 SYMATTR Value analog_sw SYMBOL voltage 1936 -1472 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_sequence5 SYMATTR Value PULSE(0 5 0ms 1ns 1ns {t_sample} {t_period}) SYMBOL sw 1648 -1072 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S6 SYMATTR Value analog_sw SYMBOL voltage 1936 -1040 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_sequence6 SYMATTR Value PULSE(0 5 {delay2} 1ns 1ns {t_sample} {t_period}) SYMBOL sw 1648 -592 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S7 SYMATTR Value analog_sw SYMBOL voltage 1936 -560 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_sequence7 SYMATTR Value PULSE(0 5 {delay3} 1ns 1ns {t_sample} {t_period}) SYMBOL sw 1648 -176 R270 WINDOW 0 30 -19 VRight 0 WINDOW 3 37 102 VRight 0 SYMATTR InstName S8 SYMATTR Value analog_sw SYMBOL voltage 1936 -144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V_sequence8 SYMATTR Value PULSE(0 5 {delay4} 1ns 1ns {t_sample} {t_period}) SYMBOL res 1520 -960 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R27 SYMATTR Value 1k SYMBOL cap 2432 -1456 R0 SYMATTR InstName C5 SYMATTR Value 100nF SYMBOL cap 2432 -1024 R0 SYMATTR InstName C6 SYMATTR Value 100nF SYMBOL cap 2432 -544 R0 SYMATTR InstName C7 SYMATTR Value 100nF SYMBOL cap 2432 -128 R0 SYMATTR InstName C8 SYMATTR Value 100nF SYMBOL res -2896 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_tss_asym SYMATTR Value 5k SYMBOL res -2112 -1488 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_lp_1 SYMATTR Value 10k SYMBOL res -2112 -1056 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_lp_2 SYMATTR Value 10k SYMBOL res -2112 -576 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_lp_3 SYMATTR Value 10k SYMBOL res -2112 -160 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_lp_4 SYMATTR Value 10k SYMBOL cap -1840 -1392 R0 SYMATTR InstName C_lp_1 SYMATTR Value 15pF SYMBOL cap -1840 -960 R0 SYMATTR InstName C_lp_2 SYMATTR Value 15pF SYMBOL cap -1840 -480 R0 SYMATTR InstName C_lp_3 SYMATTR Value 15pF SYMBOL cap -1840 -64 R0 SYMATTR InstName C_lp_4 SYMATTR Value 15pF SYMBOL res -2112 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R_lp_5 SYMATTR Value 10k SYMBOL cap -1840 352 R0 SYMATTR InstName C_lp_5 SYMATTR Value 15pF TEXT 1928 1008 Left 0 !.lib opamp.sub TEXT 240 520 Left 0 ;power supply unit, simplified\n(only batteries or DCDC converter\nallowed. Else parts of the \nEEG circuit will malfunction) TEXT -3696 -1944 Left 0 ;EEG test subject simulator (internal parts index: tss) TEXT 1928 912 Left 0 !.tran 500ms TEXT 1928 864 Left 0 ;.ac dec 100 1m 10meg TEXT 320 -248 VLeft 0 ;simulation convergence aid for LT1168\nmay or may not be required in reality TEXT -192 -1264 Left 0 ;input stage\nG=100 TEXT 1904 800 Left 0 ;LTSPICE simulation control TEXT 1936 1488 Left 0 ;Author of simulation:\nJoerg Hansmann, 2-2007 TEXT -2912 -1744 Left 0 ;1:16 voltage divider\nca. 18k source resistance TEXT -3280 -1832 Left 0 ;ca. 1:150 divider TEXT -2488 656 Left 0 ;patient_gnd_or_DRL TEXT -2488 168 Left 0 ;common_ref \n(e.g. electrodes\non A1and/or A2) TEXT -3560 912 Left 0 ;common gnd\nof mains powered \nfunction generators\n(and oscilloscopes) TEXT 1928 1056 Left 0 !.model analog_sw SW(Ron=300 Roff=1000Meg Vt=1) TEXT -1568 -1760 Left 0 ;4 : 1 Multiplexer TEXT 272 1224 Left 0 ;simulation gnd TEXT -3456 728 Left 0 ;line hum\namplitude = 200mV (400mVp-p)\nnormally TEXT 1936 1144 Left 0 !.param\n+ t_sample = 1ms\n+ t_guard = t_sample / 100000\n+ delay2 = t_sample + t_guard\n+ delay3 = 2 * (t_sample + t_guard)\n+ delay4 = 3 * (t_sample + t_guard)\n+ t_period = 4 * (t_sample + t_guard) TEXT -192 -1488 Left 0 ;JFET or CMOS input stage inst amp.\nINA114 / Ad620 / LT1168 type will not \ngive good results \ndue to high noise current through input side\nHP filter TEXT 1272 -1776 Left 0 ;AtmegaXX TEXT 856 688 Left 0 ;Warning!\n \nDo _not_ connect \n"mains_gnd"\nwith "AGND" or "V-"\n \nIn other words: Do not connect an \noscilloscope GND or power supply \nGND with AGND\n \nThis would disable the \nbenchmark test simulators \ncommon mode source\n(V_ac_line_hum) TEXT -3104 0 Left 0 ;* short R_tss_asym out \n to get perfect electrode balance\n* let R_tss_asym as it is \n for some imbalance challenge\n (more realistic) TEXT -2040 -1544 VLeft 0 ;ESD protection circuit TEXT 560 -1976 Left 0 ;2 bit mux control address line TEXT 1392 -1680 Left 0 ;software demux and s&h TEXT -1784 240 Left 0 ;DC coupled for inst amp bias return path TEXT -400 -1136 VLeft 0 ;R_hp is effectively \nmultiplied by the mux ratio (e.g. x4 )\nfor calculation of the fc of HP TEXT -1344 528 Left 0 ;DRL circuit TEXT 704 -1224 Left 0 ;2nd gain stage LINE Normal 1600 -1920 1600 -1744 LINE Normal -976 -1920 1600 -1920 LINE Normal -976 -1728 -976 -1920 LINE Normal -976 -1728 -976 -1728 LINE Normal 688 -1904 720 -1936 LINE Normal 256 -1920 288 -1936 LINE Normal 288 -1904 256 -1920 LINE Normal 288 -1904 288 -1904 RECTANGLE Normal 800 1328 240 672 1 RECTANGLE Normal -2512 832 -3696 -1904 1 RECTANGLE Normal 464 -224 288 -880 1 RECTANGLE Normal 528 -144 -192 -1184 1 RECTANGLE Normal 1912 1456 2992 832 RECTANGLE Normal 1912 1680 2992 1456 RECTANGLE Normal 2992 1680 -3808 -2992 RECTANGLE Normal -768 -1264 -1472 -1584 1 RECTANGLE Normal -768 -832 -1472 -1152 1 RECTANGLE Normal -768 -352 -1472 -672 1 RECTANGLE Normal -768 64 -1472 -256 1 RECTANGLE Normal -464 176 -1568 -1728 1 RECTANGLE Normal 2304 -1296 1600 -1616 1 RECTANGLE Normal 2304 -864 1600 -1184 1 RECTANGLE Normal 2304 -384 1600 -704 1 RECTANGLE Normal 2304 32 1600 -288 1 RECTANGLE Normal 2960 224 1272 -1744 1 RECTANGLE Normal -1888 432 -2064 -1536 1 RECTANGLE Normal 2896 176 1392 -1648 1 RECTANGLE Normal -512 1088 -1344 560 1 RECTANGLE Normal 1104 -576 704 -1184 1