* Z:\home\khalils\Downloads\files\data\raw_asc\59fc06c2d3f7_sense_amp.asc
* Generated by LTspice 26.0.1 for Windows.
* .tran 70u
* VREF control
* Temp compensation\nfor sense output
* Temp pre-compensation\nfor comparator threshold voltage
* Comparator
* Buffer (emitter follower \nwith saturation protection)
* Output inverter
* Output threshold setting\n(to ensure emitter follower can turn output off)
* I think the second stage should be a complementer design, \nthat should allow for closer-to-zero bias output to sense_out
R2 N021 N022 56
Q18 N013 N009 N002 0 2N3906
VINA INA 0 PWL file=ampl_train.pwl
R22 N017 N016 1k
R5 N012 N027 6.8k
Q1 N006 INA N020 0 2N3904
R30 N009 N008 100
R6 N026 N027 300
Q13 0 V_REF N002 0 2N3906
Q15 N001 SENSE_OUT N008 0 2N3904
R28 N027 V- 1m
Q4 N001 N006 N011 0 2N3904
R17 V_REF 0 3k
Q6 N003 N011 N015 0 2N3904
Q7 N004 N012 N014 0 2N3904
Q9 N001 N004 SENSE_OUT 0 2N3904
VP1 VCC 0 3.3
R24 V+ N001 1m
Q14 N023 N023 N026 0 2N3904
R18 N001 N002 1k
R20 N013 0 2k
R25 N016 0 200
R14 N005 N006 1k
R15 N001 N005 1.7k
VINB INB 0 0
R26 OUT1 0 100
D3 VCC N010 1N914
Q11 OUT1 N017 N010 0 2N3906
R3 N025 N027 600
VP V+ 0 12
R29 N008 0 1k
R1 N020 N022 56
Q2 N018 INB N021 0 2N3904
R16 N001 N023 2k
D4 OUT1 N017 BAT54
Q10 VCC N007 N016 0 2N3904
R12 N001 N004 1.2k
R4 N011 N027 6.8k
R10 SENSE_OUT 0 5k
VN 0 V- 12
D1 N013 N009 BAT54
R19 N001 V_REF 1.3k
I1 N024 N027 9m
D2 N007 VCC BAT54
R23 N007 N013 1k
Q3 N022 N023 N025 0 2N3904
R8 N014 N019 70
R13 N005 N018 1k
R7 N015 N019 70
R11 N001 N003 1.2k
Q5 N001 N018 N012 0 2N3904
Q8 N001 N003 SENSE_OUT 0 2N3904
R27 N010 0 100
R9 N019 N024 1k
.model D D
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.dio
.model NPN NPN
.model PNP PNP
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.bjt
.dc VINA -100m 100m 0.1m
.step temp -25 125 25
.backanno
.end

* LTspice schematic (.asc):
Version 4.1
SHEET 1 4868 1080
WIRE -224 -1328 -272 -1328
WIRE -176 -1328 -224 -1328
WIRE -64 -1328 -112 -1328
WIRE -32 -1328 -64 -1328
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WIRE 2944 -64 2864 -64
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WIRE 768 -32 768 -688
WIRE 1344 -16 1344 -80
WIRE 944 0 944 -80
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WIRE 832 544 832 -384
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RECTANGLE Normal 1952 -512 1776 -672 2
SYMBOL res 1840 192 R0
SYMATTR InstName R17
SYMATTR Value 3k
SYMBOL npn 880 -176 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL res 2448 240 R0
SYMATTR InstName R20
SYMATTR Value 2k
SYMBOL res 2352 -160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R30
SYMATTR Value 100
SYMBOL res 224 -352 R0
SYMATTR InstName R14
SYMATTR Value 1k
SYMBOL res 1664 96 R0
SYMATTR InstName R29
SYMATTR Value 1k
SYMBOL res 416 240 R0
SYMATTR InstName R2
SYMATTR Value 56
SYMBOL npn 976 -448 R0
SYMATTR InstName Q8
SYMATTR Value 2N3904
SYMBOL res 1840 -656 R0
SYMATTR InstName R19
SYMATTR Value 1.3k
SYMBOL res 336 720 R0
SYMATTR InstName R3
SYMATTR Value 600
SYMBOL schottky 3360 112 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D4
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky 2448 -80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 928 -608 R0
SYMATTR InstName R11
SYMATTR Value 1.2k
SYMBOL npn 416 496 M0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL npn 1408 -176 M0
SYMATTR InstName Q7
SYMATTR Value 2N3904
SYMBOL npn 624 -256 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL voltage -112 -1104 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName VN
SYMATTR Value 12
SYMBOL current 1136 544 R0
SYMATTR InstName I1
SYMATTR Value 9m
SYMBOL voltage 240 -1216 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName VINB
SYMATTR Value 0
SYMBOL res 3200 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R22
SYMATTR Value 1k
SYMBOL res 1328 -32 R0
SYMATTR InstName R8
SYMATTR Value 70
SYMBOL diode 2896 -144 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 416 -352 R0
SYMATTR InstName R13
SYMATTR Value 1k
SYMBOL voltage -272 -1216 R0
SYMATTR InstName VP
SYMATTR Value 12
SYMBOL npn 1264 -448 M0
SYMATTR InstName Q9
SYMATTR Value 2N3904
SYMBOL pnp 3344 48 M180
SYMATTR InstName Q11
SYMATTR Value 2N3906
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SYMATTR InstName Q2
SYMATTR Value 2N3904
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SYMATTR InstName Q14
SYMATTR Value 2N3904
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SYMATTR InstName R1
SYMATTR Value 56
SYMBOL voltage 64 -1216 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName VINA
SYMATTR Value PWL file=ampl_train.pwl
SYMBOL pnp 2032 -416 M180
SYMATTR InstName Q13
SYMATTR Value 2N3906
SYMBOL res 2992 288 R0
SYMATTR InstName R25
SYMATTR Value 200
SYMBOL res 1104 -256 R0
SYMATTR InstName R10
SYMATTR Value 5k
SYMBOL npn 176 112 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL res 336 -608 R0
SYMATTR InstName R15
SYMATTR Value 1.7k
SYMBOL pnp 2400 -96 M180
SYMATTR InstName Q18
SYMATTR Value 2N3906
SYMBOL res 816 -480 R0
SYMATTR InstName R16
SYMATTR Value 2k
SYMBOL res 752 688 R0
SYMATTR InstName R5
SYMATTR Value 6.8k
SYMBOL res 3200 224 R0
SYMATTR InstName R27
SYMATTR Value 100
SYMBOL res 672 688 R0
SYMATTR InstName R4
SYMATTR Value 6.8k
SYMBOL res 1328 -608 R0
SYMATTR InstName R12
SYMATTR Value 1.2k
SYMBOL npn 704 -32 R0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL diode 3392 -304 R0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL res 928 -16 R0
SYMATTR InstName R7
SYMATTR Value 70
SYMBOL res 2080 -688 R0
SYMATTR InstName R18
SYMATTR Value 1k
SYMBOL res 1120 240 R0
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res 3392 240 R0
SYMATTR InstName R26
SYMATTR Value 100
SYMBOL voltage 560 -1216 R0
SYMATTR InstName VP1
SYMATTR Value 3.3
SYMBOL npn 1616 -336 R0
SYMATTR InstName Q15
SYMATTR Value 2N3904
SYMBOL npn 2944 -112 R0
SYMATTR InstName Q10
SYMATTR Value 2N3904
SYMBOL res 2688 -80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R23
SYMATTR Value 1k
SYMBOL res 256 912 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R28
SYMATTR Value 1m
SYMBOL res 160 -672 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R24
SYMATTR Value 1m
SYMBOL res 480 784 R0
SYMATTR InstName R6
SYMATTR Value 300
FLAG 1456 -288 SENSE_OUT
FLAG -144 160 INA
FLAG -144 432 INB
FLAG 128 -688 V+
FLAG 112 928 V-
FLAG -272 -1120 0
FLAG 64 -1120 0
FLAG -112 -1120 0
FLAG 240 -1120 0
FLAG -224 -1328 V+
FLAG -64 -1328 V-
FLAG 144 -1328 INA
FLAG 304 -1264 INB
FLAG 1120 -48 0
FLAG 1856 96 V_REF
FLAG 3488 192 OUT1
FLAG 560 -1120 0
FLAG 608 -1328 VCC
FLAG 2464 400 0
FLAG 3008 416 0
FLAG 3280 -576 VCC
FLAG 3408 416 0
FLAG 1856 400 0
FLAG 2096 400 0
FLAG 3216 416 0
FLAG 1680 400 0
TEXT -304 976 Left 2 ;.tran 70u
TEXT -304 1008 Left 2 !.dc VINA -100m 100m 0.1m
TEXT -232 1064 Left 2 !.step temp -25 125 25
TEXT 1784 -720 Left 2 ;VREF control
TEXT 1440 -384 Left 2 ;Temp compensation\nfor sense output
TEXT 2120 -400 Left 2 ;Temp pre-compensation\nfor comparator threshold voltage
TEXT 2488 -208 Left 2 ;Comparator
TEXT 2680 -8 Left 2 ;Buffer (emitter follower \nwith saturation protection)
TEXT 3424 -96 Left 2 ;Output inverter
TEXT 3440 -272 Left 2 ;Output threshold setting\n(to ensure emitter follower can turn output off)
TEXT 856 -272 Left 2 ;I think the second stage should be a complementer design, \nthat should allow for closer-to-zero bias output to sense_out