* SPICE netlist
V1 N003 0 PULSE(0 20 100n 1n 1n 499n 1000n) AC 20
Rtip_a in_a N001 9Meg
Ri_a out_a 0 1Meg
T1 int_a 0 out_a 0 Td=10n Z0=50
Cadj_a N002 0 30p
Ctip_a in_a N001 28p
Rg_a N003 in_a 50
Ci_a out_a 0 20p
Rser_a out_a N002 100
V2 N005 0 PULSE(0 20 100n 1n 1n 499n 1000n) AC 20
Rtip_b in_b int_b 9Meg
Ri_b out_b 0 1Meg
Cadj_b N004 0 30p
Ctip_b in_b int_b 28p
Rg_b N005 in_b 50
Ci_b out_b 0 20p
Rser_b out_b N004 500
O1 int_b 0 out_b 0 LTRA1
Rt_a in_a 0 50
Rt_b in_b 0 50
V3 N007 0 PULSE(0 20 100n 1n 1n 499n 1000n) AC 20
Rtip_c in_c int_c 9Meg
Ri_c out_c 0 1Meg
Cadj_c N006 0 30p
Ctip_c in_c int_c 17p
Rg_c N007 in_c 50
Ci_c out_c 0 20p
Rser_c out_c N006 500
O2 int_c 0 out_c 0 LTRA2
Rt_c in_c 0 50
R1_a N001 int_a 270
.tran 0 1u 0 1n

* LTspice schematic (.asc)
Version 4
SHEET 1 2480 1536
WIRE -248 -704 -248 -768
WIRE -248 -768 -200 -768
WIRE -136 -768 -88 -768
WIRE -88 -768 -88 -704
WIRE 360 -672 360 -640
WIRE 360 -704 136 -704
WIRE 456 -704 664 -704
WIRE 1112 -704 1112 -672
WIRE 1112 -592 1112 -560
WIRE 808 -592 808 -560
WIRE -248 -704 -504 -704
WIRE -1240 -704 -1240 -656
WIRE -920 -704 -1240 -704
WIRE -1240 -576 -1240 -528
WIRE 1112 -704 968 -704
WIRE 1240 -704 1240 -672
WIRE 1240 -608 1240 -560
WIRE -248 -64 -248 -128
WIRE -248 -128 -200 -128
WIRE -136 -128 -88 -128
WIRE -88 -128 -88 -64
WIRE 280 -64 56 -64
WIRE 376 -64 632 -64
WIRE 1112 -64 1112 -32
WIRE 1112 48 1112 80
WIRE 776 32 776 80
WIRE -248 -64 -488 -64
WIRE -1240 -64 -1240 -16
WIRE -952 -64 -1240 -64
WIRE -1240 64 -1240 112
WIRE 1112 -64 968 -64
WIRE 1240 -64 1240 -32
WIRE 1240 32 1240 80
WIRE -488 -64 -632 -64
WIRE -632 -672 -632 -704
WIRE -632 -592 -632 -560
WIRE -632 -32 -632 -64
WIRE -632 48 -632 80
WIRE -248 592 -248 528
WIRE -248 528 -200 528
WIRE -136 528 -88 528
WIRE -88 528 -88 592
WIRE 280 592 40 592
WIRE 376 592 632 592
WIRE 1096 592 1096 624
WIRE 1096 704 1096 736
WIRE 776 688 776 736
WIRE -248 592 -488 592
WIRE -1240 592 -1240 640
WIRE -952 592 -1240 592
WIRE -1240 720 -1240 768
WIRE -88 656 -88 592
WIRE 1096 592 1224 592
WIRE 1224 592 1224 624
WIRE 1224 688 1224 736
WIRE -632 592 -872 592
WIRE -632 624 -632 592
WIRE -632 704 -632 736
WIRE 360 -640 264 -640
WIRE 264 -640 264 -560
WIRE 456 -672 456 -640
WIRE 456 -640 552 -640
WIRE 552 -640 552 -560
WIRE -632 -704 -840 -704
WIRE 1112 -704 1240 -704
WIRE -632 -64 -872 -64
WIRE -488 592 -632 592
WIRE 280 0 184 0
WIRE 184 0 184 80
WIRE 472 0 472 80
WIRE 280 656 184 656
WIRE 184 656 184 736
WIRE 472 656 472 736
WIRE 376 -32 376 0
WIRE 376 0 472 0
WIRE 280 -32 280 0
WIRE 376 624 376 656
WIRE 376 656 472 656
WIRE 280 624 280 656
WIRE 1112 -64 1240 -64
WIRE 968 592 1096 592
WIRE 696 -768 664 -768
WIRE 664 -768 664 -704
WIRE 664 -704 968 -704
WIRE 776 -768 808 -768
WIRE 808 -768 808 -656
WIRE -40 -704 -88 -704
WIRE -88 -704 -88 -640
WIRE -88 -640 -120 -640
WIRE -200 -640 -248 -640
WIRE -248 -640 -248 -704
WIRE 56 -64 -88 -64
WIRE 744 -128 776 -128
WIRE 776 -128 776 -32
WIRE 664 -128 632 -128
WIRE 632 -128 632 -64
WIRE 632 -64 968 -64
WIRE -88 -64 -88 0
WIRE -88 0 -120 0
WIRE -200 0 -248 0
WIRE -248 0 -248 -64
WIRE -200 656 -248 656
WIRE -248 656 -248 592
WIRE -88 656 -120 656
WIRE 632 592 968 592
WIRE 776 624 776 512
WIRE 776 512 744 512
WIRE 664 512 632 512
WIRE 632 512 632 592
WIRE 40 592 -88 592
WIRE 136 -704 40 -704
WIRE -504 -704 -632 -704
FLAG 264 -560 0
FLAG 552 -560 0
FLAG -1240 -528 0
FLAG 808 -560 0
FLAG 1112 -560 0
FLAG 1240 -560 0
FLAG 968 -704 out_a
FLAG -504 -704 in_a
FLAG 136 -704 int_a
FLAG -1240 112 0
FLAG 776 80 0
FLAG 1112 80 0
FLAG 1240 80 0
FLAG 968 -64 out_b
FLAG -488 -64 in_b
FLAG 56 -64 int_b
FLAG -632 -560 0
FLAG -632 80 0
FLAG -1240 768 0
FLAG 776 736 0
FLAG 1096 736 0
FLAG 1224 736 0
FLAG 968 592 out_c
FLAG -488 592 in_c
FLAG 40 592 int_c
FLAG -632 736 0
FLAG 184 80 0
FLAG 472 80 0
FLAG 184 736 0
FLAG 472 736 0
SYMBOL voltage -1240 -672 R0
SYMATTR Value PULSE(0 20 100n 1n 1n 499n 1000n)
SYMATTR Value2 AC 20
SYMATTR InstName V1
SYMBOL res -216 -624 R270
SYMATTR InstName Rtip_a
SYMATTR Value 9MEG
SYMBOL res 1096 -688 R0
SYMATTR InstName Ri_a
SYMATTR Value 1MEG
SYMBOL tline 408 -688 R0
SYMATTR Value Td=10n Z0=50
SYMATTR InstName T1
SYMBOL cap 792 -656 R0
SYMATTR InstName Cadj_a
SYMATTR Value 30p
SYMBOL cap -200 -752 R270
SYMATTR InstName Ctip_a
SYMATTR Value 28p
SYMBOL res -936 -688 R270
SYMATTR InstName Rg_a
SYMATTR Value 50
SYMBOL cap 1224 -672 R0
SYMATTR InstName Ci_a
SYMATTR Value 20p
SYMBOL res 680 -752 R270
SYMATTR InstName Rser_a
SYMATTR Value 100
SYMBOL voltage -1240 -32 R0
SYMATTR Value PULSE(0 20 100n 1n 1n 499n 1000n)
SYMATTR Value2 AC 20
SYMATTR InstName V2
SYMBOL res -216 16 R270
SYMATTR InstName Rtip_b
SYMATTR Value 9MEG
SYMBOL res 1096 -48 R0
SYMATTR InstName Ri_b
SYMATTR Value 1MEG
SYMBOL cap 760 -32 R0
SYMATTR InstName Cadj_b
SYMATTR Value 30p
SYMBOL cap -200 -112 R270
SYMATTR InstName Ctip_b
SYMATTR Value 28p
SYMBOL res -968 -48 R270
SYMATTR InstName Rg_b
SYMATTR Value 50
SYMBOL cap 1224 -32 R0
SYMATTR InstName Ci_b
SYMATTR Value 20p
SYMBOL res 648 -112 R270
SYMATTR InstName Rser_b
SYMATTR Value 500
SYMBOL ltline 328 -48 R0
SYMATTR InstName O1
SYMATTR Value LTRA1
SYMBOL res -648 -688 R0
SYMATTR InstName Rt_a
SYMATTR Value 50
SYMBOL res -648 -48 R0
SYMATTR InstName Rt_b
SYMATTR Value 50
SYMBOL voltage -1240 624 R0
SYMATTR Value PULSE(0 20 100n 1n 1n 499n 1000n)
SYMATTR Value2 AC 20
SYMATTR InstName V3
SYMBOL res -216 672 R270
SYMATTR InstName Rtip_c
SYMATTR Value 9MEG
SYMBOL res 1080 608 R0
SYMATTR InstName Ri_c
SYMATTR Value 1MEG
SYMBOL cap 760 624 R0
SYMATTR InstName Cadj_c
SYMATTR Value 30p
SYMBOL cap -200 544 R270
SYMATTR InstName Ctip_c
SYMATTR Value 17p
SYMBOL res -968 608 R270
SYMATTR InstName Rg_c
SYMATTR Value 50
SYMBOL cap 1208 624 R0
SYMATTR InstName Ci_c
SYMATTR Value 20p
SYMBOL res 648 528 R270
SYMATTR InstName Rser_c
SYMATTR Value 500
SYMBOL ltline 328 608 R0
SYMATTR InstName O2
SYMATTR Value LTRA2
SYMBOL res -648 608 R0
SYMATTR InstName Rt_c
SYMATTR Value 50
SYMBOL res -56 -688 R270
SYMATTR InstName R1_a
SYMATTR Value 270
ARC Normal 704 32 800 160 758 133 765 16 2
ARC Normal 624 672 720 800 678 773 685 656 2
ARC Normal 624 1328 720 1456 678 1429 685 1312 2