* SPICE netlist
V1 N002 0 5
R1 N005 N008 962
R3 N006 N009 16.5k
V4 N011 0 2.048
V6 N014 0 1.024
R2 N012 0 24000
XU3 N014 N012 N013 N001 0 LTC2054 ;pnba IN+)IN-)OUT)VCC)VEE
V7 N001 0 3.3
Q1 N010 N013 N012 0 BC547B
XU1 N010 N005 N008 N001 0 0 N004 N002 AD8226 ;pnba IN-)RG1)RG2)IN+)VEE)REF)OUT)VCC
XU4 N011 N006 N009 N004 0 0 N007 N003 AD8226 ;pnba IN-)RG1)RG2)IN+)VEE)REF)OUT)VCC
V2 N019 0 15
R5 N022 N025 962
V5 N020 0 15
R6 N023 N026 16.5k
V8 N028 0 2.048
V9 N031 0 1.024
R7 N029 0 24000
XU2 N031 N029 N030 N018 0 LTC2054 ;pnba IN+)IN-)OUT)VCC)VEE
V10 N018 0 3.3
Q2 N027 N030 N029 0 BC547B
XU5 N027 N022 N025 N018 0 0 N021 N019 AD8220 ;pnba IN-)RG-)RG+)IN+)VEE)REF)OUT)VCC
XU6 N028 N023 N026 N021 0 0 N024 N020 AD8220 ;pnba IN-)RG-)RG+)IN+)VEE)REF)OUT)VCC
V3 N003 0 5
V11 N017 0 2.5
M1 N015 N017 0 0 BSP89
M2 NC_01 N016 0 0 BSP89
R9 N017 0 100k
V12 N016 0 2.5
R10 N016 0 100k
R4 N001 N010 {Pt1000}
R8 N018 N027 {Pt1000}
.tran 1ms
.step param Pt1000 980 1194 1

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 1136
WIRE -128 -552 -128 -568
WIRE 384 -552 384 -568
WIRE -384 -472 -464 -472
WIRE -128 -456 -128 -472
WIRE 384 -456 384 -472
WIRE -384 -440 -384 -472
WIRE -160 -440 -384 -440
WIRE 352 -440 80 -440
WIRE -384 -408 -384 -440
WIRE -160 -408 -224 -408
WIRE 352 -408 288 -408
WIRE -224 -392 -224 -408
WIRE 288 -392 288 -408
WIRE 80 -360 80 -440
WIRE 80 -360 16 -360
WIRE 672 -360 528 -360
WIRE -160 -312 -224 -312
WIRE 352 -312 288 -312
WIRE -512 -296 -512 -312
WIRE -464 -296 -464 -472
WIRE -464 -296 -512 -296
WIRE -384 -280 -384 -328
WIRE -160 -280 -384 -280
WIRE 352 -280 272 -280
WIRE -512 -264 -512 -296
WIRE -544 -248 -592 -248
WIRE -128 -248 -128 -264
WIRE 464 -248 464 -296
WIRE -448 -232 -480 -232
WIRE 272 -232 272 -280
WIRE 384 -232 384 -264
WIRE -544 -216 -656 -216
WIRE 432 -200 432 -232
WIRE -656 -184 -656 -216
WIRE -592 -168 -592 -248
WIRE -384 -168 -384 -184
WIRE -384 -168 -592 -168
WIRE -384 -152 -384 -168
WIRE -160 -152 -256 -152
WIRE -128 -152 -160 -152
WIRE -256 -136 -256 -152
WIRE -160 -136 -160 -152
WIRE 352 -120 256 -120
WIRE 384 -120 352 -120
WIRE 256 -104 256 -120
WIRE 352 -104 352 -120
WIRE -400 168 -480 168
WIRE -144 184 -144 152
WIRE 240 184 240 152
WIRE -400 200 -400 168
WIRE -176 200 -400 200
WIRE 208 200 64 200
WIRE -176 232 -240 232
WIRE 208 232 144 232
WIRE -400 248 -400 200
WIRE -240 248 -240 232
WIRE 144 248 144 232
WIRE 64 280 64 200
WIRE 64 280 0 280
WIRE 528 280 384 280
WIRE -176 328 -240 328
WIRE 208 328 144 328
WIRE -528 344 -528 328
WIRE -480 344 -480 168
WIRE -480 344 -528 344
WIRE -400 360 -400 328
WIRE -176 360 -400 360
WIRE 208 360 128 360
WIRE -528 376 -528 344
WIRE -560 392 -608 392
WIRE -464 408 -496 408
WIRE 128 408 128 360
WIRE -560 424 -672 424
WIRE -672 456 -672 424
WIRE -608 472 -608 392
WIRE -400 472 -400 456
WIRE -400 472 -608 472
WIRE -400 488 -400 472
FLAG -128 -568 0
FLAG 272 -152 0
FLAG -384 -72 0
FLAG -512 -392 0
FLAG -512 -200 0
FLAG -656 -104 0
FLAG -144 376 0
FLAG -144 72 0
FLAG 320 344 0
FLAG 240 376 0
FLAG 240 72 0
FLAG 128 488 0
FLAG -64 344 0
FLAG -400 568 0
FLAG -528 248 0
FLAG -528 440 0
FLAG -672 536 0
FLAG 384 -568 0
FLAG 432 -104 0
FLAG 256 -24 0
FLAG -80 -136 0
FLAG 352 -24 0
FLAG -256 -56 0
FLAG -160 -56 0
FLAG -128 -248 0
FLAG -48 -296 0
FLAG 384 -232 0
FLAG 464 -248 0
SYMBOL voltage -128 -456 R180
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res -240 -408 R0
SYMATTR InstName R1
SYMATTR Value 962
SYMBOL res 272 -408 R0
SYMATTR InstName R3
SYMATTR Value 16.5k
SYMBOL voltage 272 -248 R0
SYMATTR InstName V4
SYMATTR Value 2.048
SYMBOL voltage -656 -200 R0
SYMATTR InstName V6
SYMATTR Value 1.024
SYMBOL res -400 -168 R0
SYMATTR InstName R2
SYMATTR Value 24000
SYMBOL OpAmps\\LTC2055 -512 -232 R0
SYMATTR InstName U3
SYMBOL voltage -512 -296 R180
SYMATTR InstName V7
SYMATTR Value 3.3
SYMBOL npn -448 -280 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL OpAmps\\AD8226 -128 -360 R0
SYMATTR InstName U1
SYMBOL OpAmps\\AD8226 384 -360 R0
SYMATTR InstName U4
SYMBOL voltage -144 168 R180
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL res -256 232 R0
SYMATTR InstName R5
SYMATTR Value 962
SYMBOL voltage 240 168 R180
SYMATTR InstName V5
SYMATTR Value 15
SYMBOL res 128 232 R0
SYMATTR InstName R6
SYMATTR Value 16.5k
SYMBOL voltage 128 392 R0
SYMATTR InstName V8
SYMATTR Value 2.048
SYMBOL voltage -672 440 R0
SYMATTR InstName V9
SYMATTR Value 1.024
SYMBOL res -416 472 R0
SYMATTR InstName R7
SYMATTR Value 24000
SYMBOL OpAmps\\LTC2055 -528 408 R0
SYMATTR InstName U2
SYMBOL voltage -528 344 R180
SYMATTR InstName V10
SYMATTR Value 3.3
SYMBOL npn -464 360 R0
SYMATTR InstName Q2
SYMATTR Value BC547B
SYMBOL OpAmps\\AD8220 -144 280 R0
SYMATTR InstName U5
SYMBOL OpAmps\\AD8220 240 280 R0
SYMATTR InstName U6
SYMBOL voltage 384 -456 R180
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL voltage 256 -120 R0
SYMATTR InstName V11
SYMATTR Value 2.5
SYMBOL nmos 384 -200 R0
SYMATTR InstName M1
SYMATTR Value BSP89
SYMBOL nmos -128 -232 R0
SYMATTR InstName M2
SYMATTR Value BSP89
SYMBOL res 336 -120 R0
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL voltage -256 -152 R0
SYMATTR InstName V12
SYMATTR Value 2.5
SYMBOL res -176 -152 R0
SYMATTR InstName R10
SYMATTR Value 100k
SYMBOL res -400 -424 R0
SYMATTR InstName R4
SYMATTR Value {Pt1000}
SYMBOL res -416 232 R0
SYMATTR InstName R8
SYMATTR Value {Pt1000}