* SPICE netlist
R1 PLUS12 Vod1 3k
R2 PLUS12 Vod2 3k
V3 VSINE 0 SINE(0 100m 1k) AC 1
XU1 0 N002 PLUS12 MINUS12 N001 LM741 ;pnba In+)In-)V+)V-)OUT
R3 VSINE N002 10k
R4 N002 N001 10k
V4 PLUS12 0 12
V5 0 MINUS12 12
Q1 Vod1 Vid1 N003 0 BC238
R5 N004 N003 225
R6 N005 N004 225
R7 N006 N006 {20k-Rp}
R8 0 N006 {Rp}
Q3 N006 N006 MINUS12 0 BC238
Q4 N003 N006 MINUS12 0 BC238
Q5 N005 N006 MINUS12 0 BC238
R9 VNOISE_SIMULATED Vid1 100
R10 Vid1 VSINE 100
R11 VNOISE_SIMULATED Vid2 100
R12 N001 Vid2 100
Q2 Vod2 Vid2 N005 0 BC238
B1 IGNORE_VNOISE_SIMULATED 0 V=(0.5*white(2e5*time)/10)
V1 VNOISE_SIMULATED 0 SINE(0 10m 10k)
.tran 0 4m 0 0.01
.param Rp=12.7k

* LTspice schematic (.asc)
Version 4
SHEET 1 2096 1296
WIRE 200 -536 200 -648
WIRE 200 -536 72 -536
WIRE 328 -536 200 -536
WIRE -616 -456 -616 -488
WIRE -88 -456 -88 -504
WIRE 72 -456 72 -536
WIRE 328 -456 328 -536
WIRE 456 -456 456 -504
WIRE -616 -344 -616 -376
WIRE -616 -344 -728 -344
WIRE 72 -344 72 -376
WIRE 104 -344 72 -344
WIRE 328 -344 328 -376
WIRE 328 -344 296 -344
WIRE 888 -344 840 -344
WIRE -728 -328 -728 -344
WIRE -1048 -312 -1048 -360
WIRE -616 -312 -616 -344
WIRE 72 -312 72 -344
WIRE 328 -312 328 -344
WIRE 840 -280 840 -344
WIRE 840 -280 792 -280
WIRE -296 -264 -408 -264
WIRE -88 -264 -88 -376
WIRE -88 -264 -216 -264
WIRE 8 -264 -88 -264
WIRE 456 -264 456 -376
WIRE 456 -264 392 -264
WIRE 488 -264 456 -264
WIRE 616 -264 568 -264
WIRE 728 -264 616 -264
WIRE 840 -248 792 -248
WIRE 888 -248 840 -248
WIRE 1048 -248 968 -248
WIRE -408 -216 -408 -264
WIRE -88 -216 -88 -264
WIRE 456 -216 456 -264
WIRE -1048 -200 -1048 -232
WIRE -616 -200 -616 -232
WIRE 72 -120 72 -216
WIRE 88 -120 72 -120
WIRE 232 -120 168 -120
WIRE 328 -120 328 -216
WIRE 328 -120 312 -120
WIRE -408 -88 -408 -136
WIRE 616 -72 616 -264
WIRE 680 -72 616 -72
WIRE 840 -72 840 -248
WIRE 840 -72 760 -72
WIRE -280 8 -296 8
WIRE -296 72 -296 8
WIRE -1048 184 -1048 136
WIRE -296 184 -296 152
WIRE -120 184 -296 184
WIRE -296 232 -296 184
WIRE -1048 296 -1048 264
WIRE -296 360 -296 312
WIRE -120 360 -120 184
WIRE -120 360 -296 360
WIRE -296 392 -296 360
WIRE 72 392 72 -120
WIRE 328 392 328 -120
WIRE -120 440 -120 360
WIRE -120 440 -232 440
WIRE 8 440 -120 440
WIRE 264 440 8 440
WIRE -296 616 -296 488
WIRE 72 616 72 488
WIRE 72 616 -296 616
WIRE 328 616 328 488
WIRE 328 616 72 616
WIRE 72 648 72 616
FLAG -1048 -200 0
FLAG -408 -88 0
FLAG 888 -344 0
FLAG -728 -328 0
FLAG -616 -488 PLUS12
FLAG -616 -200 MINUS12
FLAG 760 -296 MINUS12
FLAG 760 -232 PLUS12
FLAG -280 8 0
FLAG 72 648 MINUS12
FLAG 200 -648 PLUS12
FLAG -408 -264 VSINE
FLAG 1048 -248 VSINE
FLAG -1048 -360 IGNORE_VNOISE_SIMULATED
FLAG -88 -504 VNOISE_SIMULATED
FLAG 456 -504 VNOISE_SIMULATED
FLAG -1048 296 0
FLAG -1048 136 VNOISE_SIMULATED
FLAG 104 -344 Vod1
IOPIN 160 64 Out
FLAG 296 -344 Vod2
IOPIN 352 64 Out
FLAG -88 -216 Vid1
IOPIN -32 192 In
FLAG 456 -216 Vid2
IOPIN 512 192 In
SYMBOL res 56 -472 R0
SYMATTR InstName R1
SYMATTR Value 3k
SYMBOL res 312 -472 R0
SYMATTR InstName R2
SYMATTR Value 3k
SYMBOL voltage -408 -232 R0
SYMATTR Value SINE(0 100m 1k)
SYMATTR Value2 AC 1
SYMATTR InstName V3
SYMBOL OpAmps\\opamp2 760 -200 R180
SYMATTR InstName U1
SYMATTR Value LM741
SYMBOL res 984 -264 R90
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 776 -88 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL voltage -616 -472 R0
SYMATTR InstName V4
SYMATTR Value 12
SYMBOL voltage -616 -328 R0
SYMATTR InstName V5
SYMATTR Value 12
SYMBOL npn 8 -312 R0
SYMATTR InstName Q1
SYMATTR Value BC238
SYMBOL res 184 -136 R90
SYMATTR InstName R5
SYMATTR Value 225
SYMBOL res 328 -136 R90
SYMATTR InstName R6
SYMATTR Value 225
SYMBOL res -312 216 R0
SYMATTR InstName R7
SYMATTR Value {20k-Rp}
SYMBOL res -312 56 R0
SYMATTR InstName R8
SYMATTR Value {Rp}
SYMBOL npn -232 392 M0
SYMATTR InstName Q3
SYMATTR Value BC238
SYMBOL npn 8 392 R0
SYMATTR InstName Q4
SYMATTR Value BC238
SYMBOL npn 264 392 R0
SYMATTR InstName Q5
SYMATTR Value BC238
SYMBOL res -104 -472 R0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL res -200 -280 R90
SYMATTR InstName R10
SYMATTR Value 100
SYMBOL res 440 -472 R0
SYMATTR InstName R11
SYMATTR Value 100
SYMBOL res 584 -280 R90
SYMATTR InstName R12
SYMATTR Value 100
SYMBOL npn 392 -312 M0
SYMATTR InstName Q2
SYMATTR Value BC238
SYMBOL bv -1048 -328 R0
SYMATTR InstName B1
SYMATTR Value V=(0.5*white(2e5*time)/10)
SYMBOL voltage -1048 168 R0
SYMATTR InstName V1
SYMATTR Value SINE(0 10m 10k)