* SPICE netlist
M1 N020 vgb vs_m1 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
C50f 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}
M21 out vd_m20 0 0 NMOS_VTL l=50n w=70n
I2 vdd out 20n
M22 vdd out N021 0 NMOS_VTL l=50n w=150n
V3 vdd 0 1
I3 N021 0 20n
R8 N021 vs_m1 20Meg
C1 vs_m1 0 0.5n
V2 vg 0 AC 1m 0
.param CL=25f
.param Cdec=25f
.param Rval=1Meg
.op
.param Vgb=0.26
.net V2

* LTspice schematic (.asc)
Version 4
SHEET 1 3360 2064
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WIRE 896 696 816 696
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WIRE 880 888 576 888
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WIRE -1248 904 -1248 856
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WIRE -736 984 -736 952
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FLAG 944 264 0
FLAG 944 472 0
FLAG 944 664 0
FLAG 944 856 0
FLAG 1136 152 0
FLAG 1088 648 0
FLAG 400 776 0
FLAG -1152 -888 0
FLAG -1152 -680 0
FLAG -1152 -488 0
FLAG -1152 -296 0
FLAG -960 -1000 0
FLAG -1008 -504 0
FLAG -1152 -1016 vd_m8
FLAG -1616 -200 vg
FLAG -1152 -168 vd_m4
FLAG 400 664 vgb
FLAG -1680 -488 vgb
FLAG -272 -888 0
FLAG -272 -680 0
FLAG -272 -488 0
FLAG -272 -296 0
FLAG -80 -1000 0
FLAG -128 -504 0
FLAG -272 -1016 vd_m12
FLAG -736 -200 vg
FLAG -272 -168 vd_m8
FLAG -800 -488 vgb
FLAG 608 -888 0
FLAG 608 -680 0
FLAG 608 -488 0
FLAG 608 -296 0
FLAG 800 -1000 0
FLAG 752 -504 0
FLAG 608 -1016 vd_m16
FLAG 144 -200 vg
FLAG 608 -168 vd_m12
FLAG 80 -488 vgb
FLAG 1488 -888 0
FLAG 1488 -680 0
FLAG 1488 -488 0
FLAG 1488 -296 0
FLAG 1680 -1000 0
FLAG 1632 -504 0
FLAG 1488 -1016 vd_m20
FLAG 1024 -200 vg
FLAG 1488 -168 vd_m16
FLAG 960 -488 vgb
FLAG 944 136 vd_m4
FLAG 944 984 vs_m1
FLAG -1248 904 0
FLAG -1248 808 0
FLAG -736 456 vdd
FLAG -1520 536 0
FLAG -1520 456 vdd
FLAG -736 984 0
FLAG -912 984 0
FLAG -1168 840 vd_m20
FLAG -736 568 0
FLAG -944 840 vs_m1
FLAG -1248 600 out
FLAG -1248 424 vdd
FLAG 480 888 vg
FLAG 480 1032 0
SYMBOL nmos4 896 808 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M1
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 616 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M2
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 424 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M3
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 216 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M4
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1072 120 R90
SYMATTR InstName 50f
SYMATTR Value {CL}
SYMBOL cap 1072 584 R0
SYMATTR Value {CL}
SYMATTR InstName C2
SYMBOL cap 720 360 R90
SYMATTR InstName C3
SYMATTR Value {Cdec}
SYMBOL cap 720 536 R90
SYMATTR InstName C4
SYMATTR Value {Cdec}
SYMBOL cap 720 744 R90
SYMATTR InstName C5
SYMATTR Value {Cdec}
SYMBOL res 736 648 R90
SYMATTR InstName R1
SYMATTR Value {Rval}
SYMBOL voltage 400 664 R0
SYMATTR Value {Vgb}
SYMATTR InstName V1
SYMBOL nmos4 -1200 -344 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M5
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -536 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M6
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -728 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M7
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -936 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M8
SYMATTR Value2 l=50n w=150n
SYMBOL cap -1024 -1032 R90
SYMATTR InstName C6
SYMATTR Value {CL}
SYMBOL cap -1024 -568 R0
SYMATTR Value {CL}
SYMATTR InstName C7
SYMBOL cap -1376 -792 R90
SYMATTR InstName C8
SYMATTR Value {Cdec}
SYMBOL cap -1376 -616 R90
SYMATTR InstName C9
SYMATTR Value {Cdec}
SYMBOL cap -1376 -408 R90
SYMATTR InstName C10
SYMATTR Value {Cdec}
SYMBOL res -1360 -504 R90
SYMATTR InstName R4
SYMATTR Value {Rval}
SYMBOL nmos4 -320 -344 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M9
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -536 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M10
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -728 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M11
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -936 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M12
SYMATTR Value2 l=50n w=150n
SYMBOL cap -144 -1032 R90
SYMATTR InstName C11
SYMATTR Value {CL}
SYMBOL cap -144 -568 R0
SYMATTR Value {CL}
SYMATTR InstName C12
SYMBOL cap -496 -792 R90
SYMATTR InstName C13
SYMATTR Value {Cdec}
SYMBOL cap -496 -616 R90
SYMATTR InstName C14
SYMATTR Value {Cdec}
SYMBOL cap -496 -408 R90
SYMATTR InstName C15
SYMATTR Value {Cdec}
SYMBOL res -480 -504 R90
SYMATTR InstName R5
SYMATTR Value {Rval}
SYMBOL nmos4 560 -344 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M13
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -536 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M14
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -728 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M15
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -936 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M16
SYMATTR Value2 l=50n w=150n
SYMBOL cap 736 -1032 R90
SYMATTR InstName C16
SYMATTR Value {CL}
SYMBOL cap 736 -568 R0
SYMATTR Value {CL}
SYMATTR InstName C17
SYMBOL cap 384 -792 R90
SYMATTR InstName C18
SYMATTR Value {Cdec}
SYMBOL cap 384 -616 R90
SYMATTR InstName C19
SYMATTR Value {Cdec}
SYMBOL cap 384 -408 R90
SYMATTR InstName C20
SYMATTR Value {Cdec}
SYMBOL res 400 -504 R90
SYMATTR InstName R6
SYMATTR Value {Rval}
SYMBOL nmos4 1440 -344 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M17
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -536 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M18
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -728 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M19
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -936 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M20
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1616 -1032 R90
SYMATTR InstName C21
SYMATTR Value {CL}
SYMBOL cap 1616 -568 R0
SYMATTR Value {CL}
SYMATTR InstName C22
SYMBOL cap 1264 -792 R90
SYMATTR InstName C23
SYMATTR Value {Cdec}
SYMBOL cap 1264 -616 R90
SYMATTR InstName C24
SYMATTR Value {Cdec}
SYMBOL cap 1264 -408 R90
SYMATTR InstName C25
SYMATTR Value {Cdec}
SYMBOL res 1280 -504 R90
SYMATTR InstName R7
SYMATTR Value {Rval}
SYMBOL nmos4 -1200 760 M0
SYMATTR Value NMOS_VTL
SYMATTR InstName M21
SYMATTR Value2 l=50n w=70n
SYMBOL current -1248 456 R0
SYMATTR InstName I2
SYMATTR Value 20n
SYMBOL nmos4 -784 520 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M22
SYMATTR Value2 l=50n w=150n
SYMBOL voltage -1520 440 R0
SYMATTR InstName V3
SYMATTR Value 1
SYMBOL current -736 872 R0
SYMATTR InstName I3
SYMATTR Value 20n
SYMBOL res -784 824 R90
SYMATTR InstName R8
SYMATTR Value 20Meg
SYMBOL cap -928 888 R0
SYMATTR InstName C1
SYMATTR Value 0.5n
SYMBOL voltage 480 936 R0
SYMATTR InstName V2
SYMATTR Value AC 1m 0