* SPICE netlist
L1 INPUT VOUT {L}
C1 VOUT 0 {C}
C2 VOUT 0 {C}
C3 VOUT 0 {C}
C4 VE_FIL N007 {C_ZF2}
C5 VE_FIL N010 {C_ZF1}
R1 N010 N007 {R_ZF}
C6 N007 N008 {C_ZI}
R2 N008 VOUT {R_ZI}
R3 N007 VOUT {R_DIV1}
R4 VIN VREF {RREF1}
R5 VREF 0 {RREF2}
R6 N007 0 {R_DIV2}
XU1 VREF N007 VCC 0 VE_FIL level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C7 VE N005 {C_ZF2}
C8 VE N009 {C_ZF1}
R7 N009 N005 {R_ZF}
C9 N005 N006 {C_ZI}
R8 N006 VIN {R_ZI}
R9 N005 VIN {R_DIV1}
R10 VIN VREF {RREF1}
R11 VREF 0 {RREF2}
R12 N005 0 {R_DIV2}
XU2 VREF N005 VCC 0 VE level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU3 VE TR VCC 0 CONTROL level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU4 N003 N001 VCC 0 TR level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU5 N004 N003 VCC 0 N002 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
C10 TR N001 {C_OSC}
R13 TR N004 {R_1}
R14 VCC N003 {R_DIVR1}
R15 N003 0 {R_DIVR2}
R16 N001 N002 {R_OSC}
R17 N004 N002 {R_F}
V1 VIN 0 AC 1 -180
V2 VCC 0 5
V3 INPUT 0 AC 1 0
.inc closeloop_mike.txt
.ac dec 10000 20 2Meg

* LTspice schematic (.asc)
Version 4
SHEET 1 1920 1264
WIRE 336 -632 256 -632
WIRE 688 -632 400 -632
WIRE 720 -632 688 -632
WIRE 960 -632 800 -632
WIRE 608 -568 608 -600
WIRE -48 -552 -48 -616
WIRE 688 -552 688 -632
WIRE 688 -552 640 -552
WIRE 16 -536 -16 -536
WIRE 256 -536 256 -632
WIRE 256 -536 16 -536
WIRE 576 -536 256 -536
WIRE -80 -520 -112 -520
WIRE 688 -520 640 -520
WIRE 48 -504 -16 -504
WIRE 608 -456 608 -504
WIRE 864 -456 864 -504
WIRE -48 -440 -48 -488
WIRE 688 -328 688 -520
WIRE 688 -328 544 -328
WIRE 864 -328 864 -376
WIRE 864 -328 688 -328
WIRE -112 -264 -112 -328
WIRE 32 -264 32 -328
WIRE 128 -264 128 -328
WIRE 608 -264 608 -280
WIRE 544 -248 544 -328
WIRE 576 -248 544 -248
WIRE 864 -248 864 -328
WIRE 752 -232 640 -232
WIRE 576 -216 544 -216
WIRE -608 -168 -640 -168
WIRE -480 -168 -528 -168
WIRE -384 -168 -480 -168
WIRE -304 -168 -384 -168
WIRE -272 -168 -304 -168
WIRE 608 -152 608 -200
WIRE -480 -136 -480 -168
WIRE -384 -136 -384 -168
WIRE -304 -136 -304 -168
WIRE -112 -120 -112 -184
WIRE 32 -120 32 -184
WIRE 128 -120 128 -184
WIRE 864 -104 864 -168
WIRE -480 -56 -480 -72
WIRE -384 -56 -384 -72
WIRE -384 -56 -480 -56
WIRE -304 -56 -304 -72
WIRE -304 -56 -384 -56
WIRE 752 -56 752 -232
WIRE 960 -56 960 -632
WIRE 960 -56 752 -56
WIRE -480 -40 -480 -56
WIRE 256 8 256 -536
WIRE 352 8 256 8
WIRE 544 8 544 -216
WIRE 544 8 432 8
WIRE 736 8 544 8
WIRE 960 8 960 -56
WIRE 960 8 816 8
WIRE 224 136 112 136
WIRE 416 136 288 136
WIRE 560 136 528 136
WIRE 752 136 624 136
WIRE 896 136 832 136
WIRE -816 152 -928 152
WIRE -624 152 -752 152
WIRE -480 152 -512 152
WIRE -288 152 -416 152
WIRE -144 152 -208 152
WIRE 112 264 112 136
WIRE 288 264 176 264
WIRE 416 264 416 136
WIRE 416 264 368 264
WIRE 528 264 528 136
WIRE 640 264 528 264
WIRE 896 264 896 136
WIRE 896 264 720 264
WIRE -928 280 -928 152
WIRE -752 280 -864 280
WIRE -624 280 -624 152
WIRE -624 280 -672 280
WIRE -512 280 -512 152
WIRE -400 280 -512 280
WIRE -144 280 -144 152
WIRE -144 280 -320 280
WIRE 896 312 896 264
WIRE -144 328 -144 280
WIRE 240 376 240 328
WIRE -800 392 -800 344
WIRE 416 392 416 264
WIRE 416 392 272 392
WIRE 528 392 528 264
WIRE 528 392 416 392
WIRE 896 392 528 392
WIRE -624 408 -624 280
WIRE -624 408 -768 408
WIRE -512 408 -512 280
WIRE -512 408 -624 408
WIRE -144 408 -512 408
WIRE 112 408 112 264
WIRE 112 408 80 408
WIRE 208 408 112 408
WIRE 896 408 896 392
WIRE -928 424 -928 280
WIRE -928 424 -960 424
WIRE -832 424 -928 424
WIRE -144 424 -144 408
WIRE 304 424 272 424
WIRE -736 440 -768 440
WIRE 240 488 240 440
WIRE -800 504 -800 456
WIRE 304 504 304 424
WIRE -736 520 -736 440
WIRE 896 552 896 488
WIRE -144 568 -144 504
WIRE 192 568 112 568
WIRE 304 568 304 504
WIRE 304 568 272 568
WIRE 384 568 304 568
WIRE -848 584 -928 584
WIRE -736 584 -736 520
WIRE -736 584 -768 584
WIRE -656 584 -736 584
WIRE 464 616 464 568
WIRE -576 632 -576 584
FLAG -480 -40 0
FLAG -144 568 0
FLAG -576 632 0
FLAG -800 504 0
FLAG -800 344 VCC
FLAG -928 584 VIN
IOPIN -432 832 In
FLAG -960 424 VE_FIL
FLAG -736 520 VREF
FLAG -144 328 VOUT
IOPIN 352 576 In
FLAG 896 552 0
FLAG 464 616 0
FLAG 240 488 0
FLAG 240 328 VCC
FLAG 112 568 VIN
IOPIN 608 816 In
FLAG 80 408 VE
FLAG 304 504 VREF
FLAG 896 312 VIN
IOPIN 1392 560 In
FLAG -112 -120 0
FLAG 608 -456 0
FLAG 608 -152 0
FLAG 864 -104 0
FLAG -48 -440 0
FLAG -48 -616 VCC
FLAG 48 -504 VE
FLAG -112 -520 CONTROL
FLAG 608 -600 VCC
FLAG 608 -280 VCC
FLAG 864 -504 VCC
FLAG 16 -536 TR
FLAG 32 -120 0
FLAG 32 -328 VCC
FLAG 128 -120 0
FLAG -640 -168 INPUT
IOPIN -144 80 In
FLAG -272 -168 VOUT
IOPIN 224 80 Out
FLAG -112 -328 VIN
IOPIN 384 -80 In
FLAG 128 -328 INPUT
IOPIN 624 -80 In
SYMBOL ind -624 -152 R270
SYMATTR InstName L1
SYMATTR Value {L}
SYMBOL cap -496 -136 R0
SYMATTR InstName C1
SYMATTR Value {C}
SYMBOL cap -400 -136 R0
SYMATTR InstName C2
SYMATTR Value {C}
SYMBOL cap -320 -136 R0
SYMATTR InstName C3
SYMATTR Value {C}
SYMBOL cap -816 168 R270
SYMATTR InstName C4
SYMATTR Value {C_ZF2}
SYMBOL cap -928 296 R270
SYMATTR InstName C5
SYMATTR Value {C_ZF1}
SYMBOL res -768 296 R270
SYMATTR InstName R1
SYMATTR Value {R_ZF}
SYMBOL cap -480 168 R270
SYMATTR InstName C6
SYMATTR Value {C_ZI}
SYMBOL res -304 168 R270
SYMATTR InstName R2
SYMATTR Value {R_ZI}
SYMBOL res -416 296 R270
SYMATTR InstName R3
SYMATTR Value {R_DIV1}
SYMBOL res -864 600 R270
SYMATTR InstName R4
SYMATTR Value {RREF1}
SYMBOL res -672 600 R270
SYMATTR InstName R5
SYMATTR Value {RREF2}
SYMBOL res -160 408 R0
SYMATTR InstName R6
SYMATTR Value {R_DIV2}
SYMBOL OpAmps\\UniversalOpAmp2 -800 424 M0
SYMATTR InstName U1
SYMBOL cap 224 152 R270
SYMATTR InstName C7
SYMATTR Value {C_ZF2}
SYMBOL cap 112 280 R270
SYMATTR InstName C8
SYMATTR Value {C_ZF1}
SYMBOL res 272 280 R270
SYMATTR InstName R7
SYMATTR Value {R_ZF}
SYMBOL cap 560 152 R270
SYMATTR InstName C9
SYMATTR Value {C_ZI}
SYMBOL res 736 152 R270
SYMATTR InstName R8
SYMATTR Value {R_ZI}
SYMBOL res 624 280 R270
SYMATTR InstName R9
SYMATTR Value {R_DIV1}
SYMBOL res 176 584 R270
SYMATTR InstName R10
SYMATTR Value {RREF1}
SYMBOL res 368 584 R270
SYMATTR InstName R11
SYMATTR Value {RREF2}
SYMBOL res 880 392 R0
SYMATTR InstName R12
SYMATTR Value {R_DIV2}
SYMBOL OpAmps\\UniversalOpAmp2 240 408 M0
SYMATTR InstName U2
SYMBOL OpAmps\\UniversalOpAmp2 -48 -520 M0
SYMATTR InstName U3
SYMBOL OpAmps\\UniversalOpAmp2 608 -536 M0
SYMATTR InstName U4
SYMBOL OpAmps\\UniversalOpAmp2 608 -232 R0
SYMATTR InstName U5
SYMBOL cap 336 -616 R270
SYMATTR InstName C10
SYMATTR Value {C_OSC}
SYMBOL res 336 24 R270
SYMATTR InstName R13
SYMATTR Value {R_1}
SYMBOL res 880 -472 M0
SYMATTR InstName R14
SYMATTR Value {R_DIVR1}
SYMBOL res 880 -264 M0
SYMATTR InstName R15
SYMATTR Value {R_DIVR2}
SYMBOL res 704 -616 R270
SYMATTR InstName R16
SYMATTR Value {R_OSC}
SYMBOL res 720 24 R270
SYMATTR InstName R17
SYMATTR Value {R_F}
SYMBOL voltage -112 -280 R0
SYMATTR InstName V1
SYMATTR Value ""
SYMATTR Value2 AC 1 -180
SYMBOL voltage 32 -280 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage 128 -280 R0
SYMATTR InstName V3
SYMATTR Value AC 1 0