* 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 N022 0 AC 1m 0
L1 vg 0 209n
C26 vg N022 {C}
.param CL=25f
.param Cdec=25f
.param Rval=1Meg
.param Vgb=0.26
.ac list 900Meg
.net V2
.step param C 145f 147f 1f

* LTspice schematic (.asc)
Version 4
SHEET 1 3360 2304
WIRE -1088 -1136 -1152 -1136
WIRE -960 -1136 -1024 -1136
WIRE -208 -1136 -272 -1136
WIRE -80 -1136 -144 -1136
WIRE 672 -1136 608 -1136
WIRE 800 -1136 736 -1136
WIRE 1552 -1136 1488 -1136
WIRE 1680 -1136 1616 -1136
WIRE -960 -1120 -960 -1136
WIRE -80 -1120 -80 -1136
WIRE 800 -1120 800 -1136
WIRE 1680 -1120 1680 -1136
WIRE -1152 -1056 -1152 -1136
WIRE -272 -1056 -272 -1136
WIRE 608 -1056 608 -1136
WIRE 1488 -1056 1488 -1136
WIRE -1200 -976 -1280 -976
WIRE -320 -976 -400 -976
WIRE 560 -976 480 -976
WIRE 1440 -976 1360 -976
WIRE -1440 -896 -1616 -896
WIRE -1152 -896 -1152 -960
WIRE -1152 -896 -1376 -896
WIRE -560 -896 -736 -896
WIRE -272 -896 -272 -960
WIRE -272 -896 -496 -896
WIRE 320 -896 144 -896
WIRE 608 -896 608 -960
WIRE 608 -896 384 -896
WIRE 1200 -896 1024 -896
WIRE 1488 -896 1488 -960
WIRE 1488 -896 1264 -896
WIRE -1152 -848 -1152 -896
WIRE -272 -848 -272 -896
WIRE 608 -848 608 -896
WIRE 1488 -848 1488 -896
WIRE -1200 -768 -1216 -768
WIRE -320 -768 -336 -768
WIRE 560 -768 544 -768
WIRE 1440 -768 1424 -768
WIRE -1616 -720 -1616 -896
WIRE -1440 -720 -1616 -720
WIRE -1280 -720 -1280 -976
WIRE -1280 -720 -1376 -720
WIRE -736 -720 -736 -896
WIRE -560 -720 -736 -720
WIRE -400 -720 -400 -976
WIRE -400 -720 -496 -720
WIRE 144 -720 144 -896
WIRE 320 -720 144 -720
WIRE 480 -720 480 -976
WIRE 480 -720 384 -720
WIRE 1024 -720 1024 -896
WIRE 1200 -720 1024 -720
WIRE 1360 -720 1360 -976
WIRE 1360 -720 1264 -720
WIRE -1152 -704 -1152 -752
WIRE -1008 -704 -1152 -704
WIRE -272 -704 -272 -752
WIRE -128 -704 -272 -704
WIRE 608 -704 608 -752
WIRE 752 -704 608 -704
WIRE 1488 -704 1488 -752
WIRE 1632 -704 1488 -704
WIRE -1008 -688 -1008 -704
WIRE -128 -688 -128 -704
WIRE 752 -688 752 -704
WIRE 1632 -688 1632 -704
WIRE -1008 -672 -1008 -688
WIRE -128 -672 -128 -688
WIRE 752 -672 752 -688
WIRE 1632 -672 1632 -688
WIRE -1152 -656 -1152 -704
WIRE -272 -656 -272 -704
WIRE 608 -656 608 -704
WIRE 1488 -656 1488 -704
WIRE -1520 -608 -1680 -608
WIRE -1456 -608 -1520 -608
WIRE -1280 -608 -1280 -720
WIRE -1280 -608 -1376 -608
WIRE -640 -608 -800 -608
WIRE -576 -608 -640 -608
WIRE -400 -608 -400 -720
WIRE -400 -608 -496 -608
WIRE 240 -608 80 -608
WIRE 304 -608 240 -608
WIRE 480 -608 480 -720
WIRE 480 -608 384 -608
WIRE 1120 -608 960 -608
WIRE 1184 -608 1120 -608
WIRE 1360 -608 1360 -720
WIRE 1360 -608 1264 -608
WIRE -1280 -576 -1280 -608
WIRE -1200 -576 -1280 -576
WIRE -400 -576 -400 -608
WIRE -320 -576 -400 -576
WIRE 480 -576 480 -608
WIRE 560 -576 480 -576
WIRE 1360 -576 1360 -608
WIRE 1440 -576 1360 -576
WIRE -1616 -512 -1616 -720
WIRE -1440 -512 -1616 -512
WIRE -1152 -512 -1152 -560
WIRE -1152 -512 -1376 -512
WIRE -736 -512 -736 -720
WIRE -560 -512 -736 -512
WIRE -272 -512 -272 -560
WIRE -272 -512 -496 -512
WIRE 144 -512 144 -720
WIRE 320 -512 144 -512
WIRE 608 -512 608 -560
WIRE 608 -512 384 -512
WIRE 1024 -512 1024 -720
WIRE 1200 -512 1024 -512
WIRE 1488 -512 1488 -560
WIRE 1488 -512 1264 -512
WIRE -1152 -464 -1152 -512
WIRE -272 -464 -272 -512
WIRE 608 -464 608 -512
WIRE 1488 -464 1488 -512
WIRE -1520 -384 -1520 -608
WIRE -1216 -384 -1216 -768
WIRE -1216 -384 -1520 -384
WIRE -1200 -384 -1216 -384
WIRE -640 -384 -640 -608
WIRE -336 -384 -336 -768
WIRE -336 -384 -640 -384
WIRE -320 -384 -336 -384
WIRE 240 -384 240 -608
WIRE 544 -384 544 -768
WIRE 544 -384 240 -384
WIRE 560 -384 544 -384
WIRE 1120 -384 1120 -608
WIRE 1424 -384 1424 -768
WIRE 1424 -384 1120 -384
WIRE 1440 -384 1424 -384
WIRE -1616 -320 -1616 -512
WIRE -736 -320 -736 -512
WIRE 144 -320 144 -512
WIRE 1024 -320 1024 -512
WIRE -1152 -288 -1152 -368
WIRE -272 -288 -272 -368
WIRE 608 -288 608 -368
WIRE 1488 -288 1488 -368
WIRE 1008 16 944 16
WIRE 1136 16 1072 16
WIRE 1136 32 1136 16
WIRE 944 96 944 16
WIRE 896 176 816 176
WIRE 656 256 480 256
WIRE 944 256 944 192
WIRE 944 256 720 256
WIRE 944 304 944 256
WIRE -1248 336 -1248 304
WIRE 896 384 880 384
WIRE -736 400 -736 336
WIRE 480 432 480 256
WIRE 656 432 480 432
WIRE 816 432 816 176
WIRE 816 432 720 432
WIRE 944 448 944 400
WIRE 1088 448 944 448
WIRE 1088 464 1088 448
WIRE -1248 480 -1248 416
WIRE -784 480 -1248 480
WIRE 1088 480 1088 464
WIRE 944 496 944 448
WIRE 576 544 400 544
WIRE 640 544 576 544
WIRE 816 544 816 432
WIRE 816 544 720 544
WIRE 400 560 400 544
WIRE 816 576 816 544
WIRE 896 576 816 576
WIRE -1248 640 -1248 480
WIRE 480 640 480 432
WIRE 656 640 480 640
WIRE 944 640 944 592
WIRE 944 640 720 640
WIRE 400 656 400 640
WIRE 944 688 944 640
WIRE -1168 720 -1200 720
WIRE -912 720 -944 720
WIRE -880 720 -912 720
WIRE -736 720 -736 496
WIRE -736 720 -800 720
WIRE -736 752 -736 720
WIRE -912 768 -912 720
WIRE 480 768 480 640
WIRE 576 768 576 544
WIRE 880 768 880 384
WIRE 880 768 576 768
WIRE 896 768 880 768
WIRE -1248 784 -1248 736
WIRE 112 848 -64 848
WIRE 304 848 176 848
WIRE 480 848 480 768
WIRE 480 848 304 848
WIRE -912 864 -912 832
WIRE -736 864 -736 832
WIRE 944 864 944 784
WIRE 304 880 304 848
WIRE 304 992 304 960
WIRE -64 1024 -64 848
WIRE -64 1152 -64 1104
FLAG 944 144 0
FLAG 944 352 0
FLAG 944 544 0
FLAG 944 736 0
FLAG 1136 32 0
FLAG 1088 528 0
FLAG 400 656 0
FLAG -1152 -1008 0
FLAG -1152 -800 0
FLAG -1152 -608 0
FLAG -1152 -416 0
FLAG -960 -1120 0
FLAG -1008 -624 0
FLAG -1152 -1136 vd_m8
FLAG -1616 -320 vg
FLAG -1152 -288 vd_m4
FLAG 400 544 vgb
FLAG -1680 -608 vgb
FLAG -272 -1008 0
FLAG -272 -800 0
FLAG -272 -608 0
FLAG -272 -416 0
FLAG -80 -1120 0
FLAG -128 -624 0
FLAG -272 -1136 vd_m12
FLAG -736 -320 vg
FLAG -272 -288 vd_m8
FLAG -800 -608 vgb
FLAG 608 -1008 0
FLAG 608 -800 0
FLAG 608 -608 0
FLAG 608 -416 0
FLAG 800 -1120 0
FLAG 752 -624 0
FLAG 608 -1136 vd_m16
FLAG 144 -320 vg
FLAG 608 -288 vd_m12
FLAG 80 -608 vgb
FLAG 1488 -1008 0
FLAG 1488 -800 0
FLAG 1488 -608 0
FLAG 1488 -416 0
FLAG 1680 -1120 0
FLAG 1632 -624 0
FLAG 1488 -1136 vd_m20
FLAG 1024 -320 vg
FLAG 1488 -288 vd_m16
FLAG 960 -608 vgb
FLAG 944 16 vd_m4
FLAG 944 864 vs_m1
FLAG -1248 784 0
FLAG -1248 688 0
FLAG -736 336 vdd
FLAG -1520 416 0
FLAG -1520 336 vdd
FLAG -736 864 0
FLAG -912 864 0
FLAG -1168 720 vd_m20
FLAG -736 448 0
FLAG -944 720 vs_m1
FLAG -1248 480 out
FLAG -1248 304 vdd
FLAG 480 768 vg
FLAG -64 1152 0
FLAG 304 992 0
SYMBOL nmos4 896 688 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M1
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 496 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M2
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 304 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M3
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 896 96 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M4
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1072 0 R90
SYMATTR InstName 50f
SYMATTR Value {CL}
SYMBOL cap 1072 464 R0
SYMATTR Value {CL}
SYMATTR InstName C2
SYMBOL cap 720 240 R90
SYMATTR InstName C3
SYMATTR Value {Cdec}
SYMBOL cap 720 416 R90
SYMATTR InstName C4
SYMATTR Value {Cdec}
SYMBOL cap 720 624 R90
SYMATTR InstName C5
SYMATTR Value {Cdec}
SYMBOL res 736 528 R90
SYMATTR InstName R1
SYMATTR Value {Rval}
SYMBOL voltage 400 544 R0
SYMATTR Value {Vgb}
SYMATTR InstName V1
SYMBOL nmos4 -1200 -464 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M5
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -656 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M6
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -848 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M7
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -1200 -1056 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M8
SYMATTR Value2 l=50n w=150n
SYMBOL cap -1024 -1152 R90
SYMATTR InstName C6
SYMATTR Value {CL}
SYMBOL cap -1024 -688 R0
SYMATTR Value {CL}
SYMATTR InstName C7
SYMBOL cap -1376 -912 R90
SYMATTR InstName C8
SYMATTR Value {Cdec}
SYMBOL cap -1376 -736 R90
SYMATTR InstName C9
SYMATTR Value {Cdec}
SYMBOL cap -1376 -528 R90
SYMATTR InstName C10
SYMATTR Value {Cdec}
SYMBOL res -1360 -624 R90
SYMATTR InstName R4
SYMATTR Value {Rval}
SYMBOL nmos4 -320 -464 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M9
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -656 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M10
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -848 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M11
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 -320 -1056 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M12
SYMATTR Value2 l=50n w=150n
SYMBOL cap -144 -1152 R90
SYMATTR InstName C11
SYMATTR Value {CL}
SYMBOL cap -144 -688 R0
SYMATTR Value {CL}
SYMATTR InstName C12
SYMBOL cap -496 -912 R90
SYMATTR InstName C13
SYMATTR Value {Cdec}
SYMBOL cap -496 -736 R90
SYMATTR InstName C14
SYMATTR Value {Cdec}
SYMBOL cap -496 -528 R90
SYMATTR InstName C15
SYMATTR Value {Cdec}
SYMBOL res -480 -624 R90
SYMATTR InstName R5
SYMATTR Value {Rval}
SYMBOL nmos4 560 -464 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M13
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -656 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M14
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -848 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M15
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 560 -1056 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M16
SYMATTR Value2 l=50n w=150n
SYMBOL cap 736 -1152 R90
SYMATTR InstName C16
SYMATTR Value {CL}
SYMBOL cap 736 -688 R0
SYMATTR Value {CL}
SYMATTR InstName C17
SYMBOL cap 384 -912 R90
SYMATTR InstName C18
SYMATTR Value {Cdec}
SYMBOL cap 384 -736 R90
SYMATTR InstName C19
SYMATTR Value {Cdec}
SYMBOL cap 384 -528 R90
SYMATTR InstName C20
SYMATTR Value {Cdec}
SYMBOL res 400 -624 R90
SYMATTR InstName R6
SYMATTR Value {Rval}
SYMBOL nmos4 1440 -464 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M17
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -656 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M18
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -848 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M19
SYMATTR Value2 l=50n w=150n
SYMBOL nmos4 1440 -1056 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M20
SYMATTR Value2 l=50n w=150n
SYMBOL cap 1616 -1152 R90
SYMATTR InstName C21
SYMATTR Value {CL}
SYMBOL cap 1616 -688 R0
SYMATTR Value {CL}
SYMATTR InstName C22
SYMBOL cap 1264 -912 R90
SYMATTR InstName C23
SYMATTR Value {Cdec}
SYMBOL cap 1264 -736 R90
SYMATTR InstName C24
SYMATTR Value {Cdec}
SYMBOL cap 1264 -528 R90
SYMATTR InstName C25
SYMATTR Value {Cdec}
SYMBOL res 1280 -624 R90
SYMATTR InstName R7
SYMATTR Value {Rval}
SYMBOL nmos4 -1200 640 M0
SYMATTR Value NMOS_VTL
SYMATTR InstName M21
SYMATTR Value2 l=50n w=70n
SYMBOL current -1248 336 R0
SYMATTR InstName I2
SYMATTR Value 20n
SYMBOL nmos4 -784 400 R0
SYMATTR Value NMOS_VTL
SYMATTR InstName M22
SYMATTR Value2 l=50n w=150n
SYMBOL voltage -1520 320 R0
SYMATTR InstName V3
SYMATTR Value 1
SYMBOL current -736 752 R0
SYMATTR InstName I3
SYMATTR Value 20n
SYMBOL res -784 704 R90
SYMATTR InstName R8
SYMATTR Value 20Meg
SYMBOL cap -928 768 R0
SYMATTR InstName C1
SYMATTR Value 0.5n
SYMBOL voltage -64 1008 R0
SYMATTR InstName V2
SYMATTR Value AC 1m 0
SYMBOL ind 288 864 R0
SYMATTR InstName L1
SYMATTR Value 209n
SYMBOL cap 176 832 R90
SYMATTR InstName C26
SYMATTR Value {C}