* SPICE netlist
R1 N001 Vin_audio {10/x1}
R2 N001 0 {1/(20*x1)}
R3 N002 VBPF1 {20/x1}
C1 VBPF1 N001 {C}
C2 N002 N001 {C}
V1 Vin_audio 0 SINE(0 0.45 3.3k) AC 1 0
V2 VDD 0 5
V3 0 VSS 5
R4 N003 Vin_audio {10/x2}
R5 N003 0 {1/(20*x2)}
R6 N004 VBPF2 {20/x2}
C3 VBPF2 N003 {C}
C4 N004 N003 {C}
R7 VDD VCM 10
R8 VCM 0 10
XU1 VCM N002 VDD VSS VBPF1 level1 Avol=1Meg GBW=10Meg Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU2 VCM N004 VDD VSS VBPF2 level1 Avol=1Meg GBW=10Meg Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
;.ac dec 100 1 1G
.tran 0 1 uic
.param C 10n
.param fo1 1k
.param fo2 3k
.param x1 6.38e-5
.param x2 3*6.28e-5

* LTspice schematic (.asc)
Version 4
SHEET 1 1296 912
WIRE 264 -440 200 -440
WIRE 504 -440 328 -440
WIRE 392 -376 312 -376
WIRE 504 -376 504 -440
WIRE 504 -376 472 -376
WIRE -648 -280 -648 -296
WIRE -472 -280 -472 -296
WIRE 392 -248 392 -264
WIRE 88 -232 56 -232
WIRE 200 -232 200 -440
WIRE 200 -232 168 -232
WIRE 248 -232 200 -232
WIRE 312 -232 312 -376
WIRE 360 -232 312 -232
WIRE 504 -216 504 -376
WIRE 504 -216 424 -216
WIRE 632 -216 504 -216
WIRE 200 -200 200 -232
WIRE 360 -200 344 -200
WIRE -648 -184 -648 -200
WIRE -472 -184 -472 -200
WIRE -408 -184 -472 -184
WIRE -472 -168 -472 -184
WIRE 344 -168 344 -200
WIRE -648 -120 -648 -136
WIRE 200 -104 200 -120
WIRE 392 -104 392 -184
WIRE -472 -72 -472 -88
WIRE -648 -24 -648 -40
WIRE 264 120 200 120
WIRE 504 120 328 120
WIRE 392 184 312 184
WIRE 504 184 504 120
WIRE 504 184 472 184
WIRE -648 200 -648 184
WIRE -648 296 -648 280
WIRE 392 312 392 296
WIRE 88 328 56 328
WIRE 200 328 200 120
WIRE 200 328 168 328
WIRE 248 328 200 328
WIRE 312 328 312 184
WIRE 360 328 312 328
WIRE 504 344 504 184
WIRE 504 344 424 344
WIRE 648 344 504 344
WIRE 200 360 200 328
WIRE 360 360 344 360
WIRE 344 392 344 360
WIRE 200 456 200 440
WIRE 392 456 392 376
FLAG 200 -104 0
FLAG 392 -104 VSS
IOPIN 2752 560 In
FLAG 392 -264 VDD
IOPIN 2752 400 In
FLAG 56 -232 Vin_audio
IOPIN 2416 432 In
FLAG -648 184 Vin_audio
IOPIN 1712 848 Out
FLAG -648 296 0
FLAG -648 -184 0
FLAG -648 -296 VDD
IOPIN 1712 368 Out
FLAG -648 -136 0
FLAG -648 -24 VSS
IOPIN 1712 640 Out
FLAG 200 456 0
FLAG 392 456 VSS
IOPIN 2752 1120 In
FLAG 392 296 VDD
IOPIN 2752 960 In
FLAG 56 328 Vin_audio
IOPIN 2416 992 In
FLAG -472 -72 0
FLAG -472 -296 VDD
IOPIN 1888 368 In
FLAG -408 -184 VCM
IOPIN 1952 480 Out
FLAG 344 -168 VCM
IOPIN 2704 496 In
FLAG 344 392 VCM
IOPIN 2704 1056 In
FLAG 648 344 VBPF2
IOPIN 3008 1008 Out
FLAG 632 -216 VBPF1
IOPIN 2992 448 Out
SYMBOL res 184 -248 R90
SYMATTR InstName R1
SYMATTR Value {10/x1}
SYMBOL res 184 -216 R0
SYMATTR InstName R2
SYMATTR Value {1/(20*x1)}
SYMBOL res 376 -360 R270
SYMATTR InstName R3
SYMATTR Value {20/x1}
SYMBOL cap 328 -456 R90
SYMATTR InstName C1
SYMATTR Value {C}
SYMBOL cap 312 -248 R90
SYMATTR InstName C2
SYMATTR Value {C}
SYMBOL voltage -648 184 R0
SYMATTR Value SINE(0 0.45 3.3k)
SYMATTR InstName V1
SYMATTR Value2 AC 1 0
SYMBOL voltage -648 -296 R0
SYMATTR Value 5
SYMATTR InstName V2
SYMBOL voltage -648 -136 R0
SYMATTR Value 5
SYMATTR InstName V3
SYMBOL res 184 312 R90
SYMATTR InstName R4
SYMATTR Value {10/x2}
SYMBOL res 184 344 R0
SYMATTR InstName R5
SYMATTR Value {1/(20*x2)}
SYMBOL res 376 200 R270
SYMATTR InstName R6
SYMATTR Value {20/x2}
SYMBOL cap 328 104 R90
SYMATTR InstName C3
SYMATTR Value {C}
SYMBOL cap 312 312 R90
SYMATTR InstName C4
SYMATTR Value {C}
SYMBOL res -488 -296 R0
SYMATTR InstName R7
SYMATTR Value 10
SYMBOL res -488 -184 R0
SYMATTR InstName R8
SYMATTR Value 10
SYMBOL OpAmps\\UniversalOpAmp 392 -216 R0
SYMATTR InstName U1
SYMBOL OpAmps\\UniversalOpAmp 392 344 R0
SYMATTR InstName U2