* SPICE netlist
V1 N001 0 12
R1 N007 0 4.7k
R2 N001 N007 4.7k
RFA stage1 N006 7k
C1 N001 0 100n
RLA stage1 0 10k
V_thermo N008 0 V
XU3 N007 ref N001 0 ref level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=2.5 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU4 N005 N006 N001 0 stage1 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=70m Rail=2.5 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU5 stage1 N003 N001 0 stage2 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=2.5 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
R_1B N002 N001 933
RGB N003 N002 4.7k
RFB1 stage2 N003 18.8k
R_2B 0 N002 1.2k
RLB 0 stage2 10k
R8 stage2 out 8.2k
R9 out 0 4.7k
C2 N001 0 100n
R_1A N005 N008 4.7k
R_2A N005 N001 18.8k
C3 ref 0 100n
RGA N006 0 4.7k
.dc V_thermo -2m 18m 1m

* LTspice schematic (.asc)
Version 4
SHEET 1 2160 576
WIRE 568 -288 -1080 -288
WIRE -1080 -176 -1080 -288
WIRE 232 -176 -1080 -176
WIRE 360 -176 312 -176
WIRE 392 -176 360 -176
WIRE 504 -176 472 -176
WIRE 664 -176 504 -176
WIRE 904 -176 744 -176
WIRE 904 -144 904 -176
WIRE -1080 -128 -1080 -176
WIRE -744 -128 -1080 -128
WIRE -568 -128 -744 -128
WIRE -168 -128 -568 -128
WIRE 568 -96 568 -288
WIRE 568 -96 472 -96
WIRE -1080 -48 -1080 -128
WIRE -920 -48 -1080 -48
WIRE -648 -16 -824 -16
WIRE -616 -16 -648 -16
WIRE -568 -16 -568 -128
WIRE -504 -16 -568 -16
WIRE -248 -16 -424 -16
WIRE -120 -16 -232 -16
WIRE 88 -16 -40 -16
WIRE 568 -16 568 -96
WIRE 504 0 504 -176
WIRE 536 0 504 0
WIRE -920 16 -920 -48
WIRE 712 16 600 16
WIRE 760 16 712 16
WIRE 904 16 904 -64
WIRE 904 16 760 16
WIRE -168 32 -168 -128
WIRE -88 32 -168 32
WIRE 88 32 88 -16
WIRE 536 32 88 32
WIRE 904 64 904 16
WIRE -744 80 -744 -128
WIRE -168 80 -168 32
WIRE -1080 96 -1080 -48
WIRE -824 96 -824 -16
WIRE -776 96 -824 96
WIRE -232 96 -232 -16
WIRE -200 96 -232 96
WIRE 360 96 360 -176
WIRE -616 112 -616 -16
WIRE -616 112 -712 112
WIRE 24 112 -136 112
WIRE 56 112 24 112
WIRE 88 112 88 32
WIRE 88 112 56 112
WIRE 712 112 712 16
WIRE -920 128 -920 96
WIRE -776 128 -920 128
WIRE -360 128 -488 128
WIRE -248 128 -248 -16
WIRE -248 128 -280 128
WIRE -200 128 -248 128
WIRE 472 128 472 -96
WIRE -920 160 -920 128
WIRE -616 160 -616 112
WIRE -488 160 -488 128
WIRE -232 160 -232 96
WIRE -88 160 -88 32
WIRE 24 160 24 112
WIRE 904 160 904 144
WIRE 1048 160 904 160
WIRE 1080 160 1048 160
WIRE 904 176 904 160
WIRE 472 240 472 192
WIRE 568 240 568 48
WIRE 568 240 472 240
WIRE -168 256 -168 144
WIRE -88 256 -88 224
WIRE -88 256 -168 256
WIRE -1080 288 -1080 176
WIRE -920 288 -920 240
WIRE -744 288 -744 144
WIRE -616 288 -616 224
WIRE -488 288 -488 240
WIRE -232 288 -232 240
WIRE -168 288 -168 256
WIRE 24 288 24 240
WIRE 360 288 360 176
WIRE 568 288 568 240
WIRE 712 288 712 192
WIRE 904 288 904 256
FLAG -1080 288 0
FLAG -920 288 0
FLAG -744 288 0
FLAG -648 -16 ref
FLAG -168 288 0
FLAG 24 288 0
FLAG 56 112 stage1
FLAG -488 288 0
FLAG 360 288 0
FLAG 712 288 0
FLAG 760 16 stage2
FLAG 904 288 0
FLAG 1048 160 out
FLAG 568 288 0
FLAG -616 288 0
FLAG -232 288 0
SYMBOL voltage -1080 80 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL Res -936 144 R0
SYMATTR InstName R1
SYMATTR Value 4.7k
SYMBOL Res -936 0 R0
SYMATTR InstName R2
SYMATTR Value 4.7k
SYMBOL Res -24 -32 R90
SYMATTR InstName RFA
SYMATTR Value 7k
SYMBOL Cap -104 160 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL Res 8 144 R0
SYMATTR InstName RLA
SYMATTR Value 10k
SYMBOL voltage -488 144 R0
SYMATTR InstName V_thermo
SYMBOL OpAmps/UniversalOpAmp2 -744 112 R0
SYMATTR InstName U3
SYMATTR SpiceLine Ilimit=25m Rail=2.5 Vos=0
SYMBOL OpAmps/UniversalOpAmp2 -168 112 R0
SYMATTR InstName U4
SYMATTR SpiceLine Ilimit=70m Rail=2.5 Vos=0
SYMBOL OpAmps/UniversalOpAmp2 568 16 R0
SYMATTR InstName U5
SYMATTR SpiceLine Ilimit=25m Rail=2.5 Vos=0
SYMBOL Res 328 -192 R90
SYMATTR InstName R_1B
SYMATTR Value 933
SYMBOL Res 488 -192 R90
SYMATTR InstName RGB
SYMATTR Value 4.7k
SYMBOL Res 760 -192 R90
SYMATTR InstName RFB1
SYMATTR Value 18.8k
SYMBOL Res 376 192 R180
SYMATTR InstName R_2B
SYMATTR Value 1.2k
SYMBOL Res 728 208 R180
SYMATTR InstName RLB
SYMATTR Value 10k
SYMBOL Res 888 48 R0
SYMATTR InstName R8
SYMATTR Value 8.2k
SYMBOL Res 888 160 R0
SYMATTR InstName R9
SYMATTR Value 4.7k
SYMBOL Cap 456 128 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL Res -264 112 R90
SYMATTR InstName R_1A
SYMATTR Value 4.7k
SYMBOL Res -408 -32 R90
SYMATTR InstName R_2A
SYMATTR Value 18.8k
SYMBOL Cap -632 160 R0
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL Res -248 144 R0
SYMATTR InstName RGA
SYMATTR Value 4.7k
SYMBOL Res 888 -160 R0
SYMATTR InstName RFB2
SYMATTR Value 0