* SPICE netlist
M1 N020 vgb 0 0 NMOS_VTL l=50n w=150n
M2 N019 N017 N020 0 NMOS_VTL l=50n w=150n
M3 N018 vgb N019 0 NMOS_VTL l=50n w=150n
M4 vd_m4 N017 N018 0 NMOS_VTL l=50n w=150n
C1 0 vd_m4 {CL}
C2 N019 0 {CL}
C3 N018 vg {Cdec}
C4 N017 vg {Cdec}
C5 N020 vg {Cdec}
R1 N017 vgb {Rval}
V1 vgb 0 {Vgb}
M5 N013 vgb vd_m4 0 NMOS_VTL l=50n w=150n
M6 N009 N001 N013 0 NMOS_VTL l=50n w=150n
M7 N005 vgb N009 0 NMOS_VTL l=50n w=150n
M8 vd_m8 N001 N005 0 NMOS_VTL l=50n w=150n
C6 0 vd_m8 {CL}
C7 N009 0 {CL}
C8 N005 vg {Cdec}
C9 N001 vg {Cdec}
C10 N013 vg {Cdec}
R4 N001 vgb {Rval}
M9 N014 vgb vd_m8 0 NMOS_VTL l=50n w=150n
M10 N010 N002 N014 0 NMOS_VTL l=50n w=150n
M11 N006 vgb N010 0 NMOS_VTL l=50n w=150n
M12 vd_m12 N002 N006 0 NMOS_VTL l=50n w=150n
C11 0 vd_m12 {CL}
C12 N010 0 {CL}
C13 N006 vg {Cdec}
C14 N002 vg {Cdec}
C15 N014 vg {Cdec}
R5 N002 vgb {Rval}
M13 N015 vgb vd_m12 0 NMOS_VTL l=50n w=150n
M14 N011 N003 N015 0 NMOS_VTL l=50n w=150n
M15 N007 vgb N011 0 NMOS_VTL l=50n w=150n
M16 vd_m16 N003 N007 0 NMOS_VTL l=50n w=150n
C16 0 vd_m16 {CL}
C17 N011 0 {CL}
C18 N007 vg {Cdec}
C19 N003 vg {Cdec}
C20 N015 vg {Cdec}
R6 N003 vgb {Rval}
M17 N016 vgb vd_m16 0 NMOS_VTL l=50n w=150n
M18 N012 N004 N016 0 NMOS_VTL l=50n w=150n
M19 N008 vgb N012 0 NMOS_VTL l=50n w=150n
M20 vd_m20 N004 N008 0 NMOS_VTL l=50n w=150n
C21 0 vd_m20 {CL}
C22 N012 0 {CL}
C23 N008 vg {Cdec}
C24 N004 vg {Cdec}
C25 N016 vg {Cdec}
R7 N004 vgb {Rval}
V3 vg 0 0 AC 1m 0
.param CL=25f
.param Cdec=25f
.param Rval=1Meg
.param Vgb=0.14
.ac list 900Meg
.net V3

* LTspice schematic (.asc)
Version 4
SHEET 1 3360 2096
WIRE -1088 -1032 -1152 -1032
WIRE -960 -1032 -1024 -1032
WIRE -208 -1032 -272 -1032
WIRE -80 -1032 -144 -1032
WIRE 672 -1032 608 -1032
WIRE 800 -1032 736 -1032
WIRE 1552 -1032 1488 -1032
WIRE 1680 -1032 1616 -1032
WIRE -960 -1016 -960 -1032
WIRE -80 -1016 -80 -1032
WIRE 800 -1016 800 -1032
WIRE 1680 -1016 1680 -1032
WIRE -1152 -952 -1152 -1032
WIRE -272 -952 -272 -1032
WIRE 608 -952 608 -1032
WIRE 1488 -952 1488 -1032
WIRE -1200 -872 -1280 -872
WIRE -320 -872 -400 -872
WIRE 560 -872 480 -872
WIRE 1440 -872 1360 -872
WIRE -1440 -792 -1616 -792
WIRE -1152 -792 -1152 -856
WIRE -1152 -792 -1376 -792
WIRE -560 -792 -736 -792
WIRE -272 -792 -272 -856
WIRE -272 -792 -496 -792
WIRE 320 -792 144 -792
WIRE 608 -792 608 -856
WIRE 608 -792 384 -792
WIRE 1200 -792 1024 -792
WIRE 1488 -792 1488 -856
WIRE 1488 -792 1264 -792
WIRE -1152 -744 -1152 -792
WIRE -272 -744 -272 -792
WIRE 608 -744 608 -792
WIRE 1488 -744 1488 -792
WIRE -1200 -664 -1216 -664
WIRE -320 -664 -336 -664
WIRE 560 -664 544 -664
WIRE 1440 -664 1424 -664
WIRE -1616 -616 -1616 -792
WIRE -1440 -616 -1616 -616
WIRE -1280 -616 -1280 -872
WIRE -1280 -616 -1376 -616
WIRE -736 -616 -736 -792
WIRE -560 -616 -736 -616
WIRE -400 -616 -400 -872
WIRE -400 -616 -496 -616
WIRE 144 -616 144 -792
WIRE 320 -616 144 -616
WIRE 480 -616 480 -872
WIRE 480 -616 384 -616
WIRE 1024 -616 1024 -792
WIRE 1200 -616 1024 -616
WIRE 1360 -616 1360 -872
WIRE 1360 -616 1264 -616
WIRE -1152 -600 -1152 -648
WIRE -1008 -600 -1152 -600
WIRE -272 -600 -272 -648
WIRE -128 -600 -272 -600
WIRE 608 -600 608 -648
WIRE 752 -600 608 -600
WIRE 1488 -600 1488 -648
WIRE 1632 -600 1488 -600
WIRE -1008 -584 -1008 -600
WIRE -128 -584 -128 -600
WIRE 752 -584 752 -600
WIRE 1632 -584 1632 -600
WIRE -1008 -568 -1008 -584
WIRE -128 -568 -128 -584
WIRE 752 -568 752 -584
WIRE 1632 -568 1632 -584
WIRE -1152 -552 -1152 -600
WIRE -272 -552 -272 -600
WIRE 608 -552 608 -600
WIRE 1488 -552 1488 -600
WIRE -1520 -504 -1680 -504
WIRE -1456 -504 -1520 -504
WIRE -1280 -504 -1280 -616
WIRE -1280 -504 -1376 -504
WIRE -640 -504 -800 -504
WIRE -576 -504 -640 -504
WIRE -400 -504 -400 -616
WIRE -400 -504 -496 -504
WIRE 240 -504 80 -504
WIRE 304 -504 240 -504
WIRE 480 -504 480 -616
WIRE 480 -504 384 -504
WIRE 1120 -504 960 -504
WIRE 1184 -504 1120 -504
WIRE 1360 -504 1360 -616
WIRE 1360 -504 1264 -504
WIRE -1280 -472 -1280 -504
WIRE -1200 -472 -1280 -472
WIRE -400 -472 -400 -504
WIRE -320 -472 -400 -472
WIRE 480 -472 480 -504
WIRE 560 -472 480 -472
WIRE 1360 -472 1360 -504
WIRE 1440 -472 1360 -472
WIRE -1616 -408 -1616 -616
WIRE -1440 -408 -1616 -408
WIRE -1152 -408 -1152 -456
WIRE -1152 -408 -1376 -408
WIRE -736 -408 -736 -616
WIRE -560 -408 -736 -408
WIRE -272 -408 -272 -456
WIRE -272 -408 -496 -408
WIRE 144 -408 144 -616
WIRE 320 -408 144 -408
WIRE 608 -408 608 -456
WIRE 608 -408 384 -408
WIRE 1024 -408 1024 -616
WIRE 1200 -408 1024 -408
WIRE 1488 -408 1488 -456
WIRE 1488 -408 1264 -408
WIRE -1152 -360 -1152 -408
WIRE -272 -360 -272 -408
WIRE 608 -360 608 -408
WIRE 1488 -360 1488 -408
WIRE -1520 -280 -1520 -504
WIRE -1216 -280 -1216 -664
WIRE -1216 -280 -1520 -280
WIRE -1200 -280 -1216 -280
WIRE -640 -280 -640 -504
WIRE -336 -280 -336 -664
WIRE -336 -280 -640 -280
WIRE -320 -280 -336 -280
WIRE 240 -280 240 -504
WIRE 544 -280 544 -664
WIRE 544 -280 240 -280
WIRE 560 -280 544 -280
WIRE 1120 -280 1120 -504
WIRE 1424 -280 1424 -664
WIRE 1424 -280 1120 -280
WIRE 1440 -280 1424 -280
WIRE -1616 -216 -1616 -408
WIRE -736 -216 -736 -408
WIRE 144 -216 144 -408
WIRE 1024 -216 1024 -408
WIRE -1152 -184 -1152 -264
WIRE -272 -184 -272 -264
WIRE 608 -184 608 -264
WIRE 1488 -184 1488 -264
WIRE 1008 120 944 120
WIRE 1136 120 1072 120
WIRE 1136 136 1136 120
WIRE 944 200 944 120
WIRE 896 280 816 280
WIRE 656 360 480 360
WIRE 944 360 944 296
WIRE 944 360 720 360
WIRE 944 408 944 360
WIRE 896 488 880 488
WIRE 480 536 480 360
WIRE 656 536 480 536
WIRE 816 536 816 280
WIRE 816 536 720 536
WIRE 944 552 944 504
WIRE 1088 552 944 552
WIRE 1088 568 1088 552
WIRE 1088 584 1088 568
WIRE 944 600 944 552
WIRE 576 648 400 648
WIRE 640 648 576 648
WIRE 816 648 816 536
WIRE 816 648 720 648
WIRE 400 664 400 648
WIRE 816 680 816 648
WIRE 896 680 816 680
WIRE 480 744 480 536
WIRE 656 744 480 744
WIRE 944 744 944 696
WIRE 944 744 720 744
WIRE 400 760 400 744
WIRE 944 792 944 744
WIRE 576 872 576 648
WIRE 880 872 880 488
WIRE 880 872 576 872
WIRE 896 872 880 872
WIRE 480 888 480 744
WIRE 480 952 480 888
WIRE 944 968 944 888
WIRE 480 1048 480 1032
FLAG 944 968 0
FLAG 944 248 0
FLAG 944 456 0
FLAG 944 648 0
FLAG 944 840 0
FLAG 1136 136 0
FLAG 1088 632 0
FLAG 400 760 0
FLAG -1152 -904 0
FLAG -1152 -696 0
FLAG -1152 -504 0
FLAG -1152 -312 0
FLAG -960 -1016 0
FLAG -1008 -520 0
FLAG -1152 -1032 vd_m8
FLAG -1616 -216 vg
FLAG -1152 -184 vd_m4
FLAG 400 648 vgb
FLAG -1680 -504 vgb
FLAG -272 -904 0
FLAG -272 -696 0
FLAG -272 -504 0
FLAG -272 -312 0
FLAG -80 -1016 0
FLAG -128 -520 0
FLAG -272 -1032 vd_m12
FLAG -736 -216 vg
FLAG -272 -184 vd_m8
FLAG -800 -504 vgb
FLAG 608 -904 0
FLAG 608 -696 0
FLAG 608 -504 0
FLAG 608 -312 0
FLAG 800 -1016 0
FLAG 752 -520 0
FLAG 608 -1032 vd_m16
FLAG 144 -216 vg
FLAG 608 -184 vd_m12
FLAG 80 -504 vgb
FLAG 1488 -904 0
FLAG 1488 -696 0
FLAG 1488 -504 0
FLAG 1488 -312 0
FLAG 1680 -1016 0
FLAG 1632 -520 0
FLAG 1488 -1032 vd_m20
FLAG 1024 -216 vg
FLAG 1488 -184 vd_m16
FLAG 960 -504 vgb
FLAG 944 120 vd_m4
FLAG 480 1048 0
FLAG 480 888 vg
SYMBOL nmos4 896 792 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M1
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 600 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M2
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 408 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M3
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 200 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M4
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1072 104 R90
SYMATTR InstName C1
SYMATTR Value {CL}
SYMBOL cap 1072 568 R0
SYMATTR Value {CL}
SYMATTR InstName C2
SYMBOL cap 720 344 R90
SYMATTR InstName C3
SYMATTR Value {Cdec}
SYMBOL cap 720 520 R90
SYMATTR InstName C4
SYMATTR Value {Cdec}
SYMBOL cap 720 728 R90
SYMATTR InstName C5
SYMATTR Value {Cdec}
SYMBOL res 736 632 R90
SYMATTR InstName R1
SYMATTR Value {Rval}
SYMBOL voltage 400 648 R0
SYMATTR Value {Vgb}
SYMATTR InstName V1
SYMBOL nmos4 -1200 -360 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M5
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -552 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M6
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -744 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M7
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -952 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M8
SYMATTR Value2 l=50n w=150n
SYMBOL cap -1024 -1048 R90
SYMATTR InstName C6
SYMATTR Value {CL}
SYMBOL cap -1024 -584 R0
SYMATTR Value {CL}
SYMATTR InstName C7
SYMBOL cap -1376 -808 R90
SYMATTR InstName C8
SYMATTR Value {Cdec}
SYMBOL cap -1376 -632 R90
SYMATTR InstName C9
SYMATTR Value {Cdec}
SYMBOL cap -1376 -424 R90
SYMATTR InstName C10
SYMATTR Value {Cdec}
SYMBOL res -1360 -520 R90
SYMATTR InstName R4
SYMATTR Value {Rval}
SYMBOL nmos4 -320 -360 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M9
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -552 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M10
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -744 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M11
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -952 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M12
SYMATTR Value2 l=50n w=150n
SYMBOL cap -144 -1048 R90
SYMATTR InstName C11
SYMATTR Value {CL}
SYMBOL cap -144 -584 R0
SYMATTR Value {CL}
SYMATTR InstName C12
SYMBOL cap -496 -808 R90
SYMATTR InstName C13
SYMATTR Value {Cdec}
SYMBOL cap -496 -632 R90
SYMATTR InstName C14
SYMATTR Value {Cdec}
SYMBOL cap -496 -424 R90
SYMATTR InstName C15
SYMATTR Value {Cdec}
SYMBOL res -480 -520 R90
SYMATTR InstName R5
SYMATTR Value {Rval}
SYMBOL nmos4 560 -360 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M13
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -552 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M14
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -744 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M15
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -952 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M16
SYMATTR Value2 l=50n w=150n
SYMBOL cap 736 -1048 R90
SYMATTR InstName C16
SYMATTR Value {CL}
SYMBOL cap 736 -584 R0
SYMATTR Value {CL}
SYMATTR InstName C17
SYMBOL cap 384 -808 R90
SYMATTR InstName C18
SYMATTR Value {Cdec}
SYMBOL cap 384 -632 R90
SYMATTR InstName C19
SYMATTR Value {Cdec}
SYMBOL cap 384 -424 R90
SYMATTR InstName C20
SYMATTR Value {Cdec}
SYMBOL res 400 -520 R90
SYMATTR InstName R6
SYMATTR Value {Rval}
SYMBOL nmos4 1440 -360 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M17
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -552 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M18
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -744 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M19
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -952 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M20
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1616 -1048 R90
SYMATTR InstName C21
SYMATTR Value {CL}
SYMBOL cap 1616 -584 R0
SYMATTR Value {CL}
SYMATTR InstName C22
SYMBOL cap 1264 -808 R90
SYMATTR InstName C23
SYMATTR Value {Cdec}
SYMBOL cap 1264 -632 R90
SYMATTR InstName C24
SYMATTR Value {Cdec}
SYMBOL cap 1264 -424 R90
SYMATTR InstName C25
SYMATTR Value {Cdec}
SYMBOL res 1280 -520 R90
SYMATTR InstName R7
SYMATTR Value {Rval}
SYMBOL voltage 480 936 R0
SYMATTR Value 0
SYMATTR Value2 AC 1m 0
SYMATTR InstName V3