* SPICE netlist
A1 SIG1 0 0 0 0 0 N002 0 BUF ref={vcc1/2}
A11 COMP1 0 0 0 0 0 N009 0 BUF ref={vcc1/2}
M1 PC2 N041 0 0 MHCNEN W=250u L=2.5u
M2 PC2 N034 VCC VCC MHCPEN W=500u L=2.4u
A3 N003 0 0 0 0 N004 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A23 N007 0 0 0 0 0 N008 0 BUF td={tdel1} tripdt={tripdt1} ref=0.5 vhigh={vcc1}
A13 N010 0 0 0 0 N005 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A14 N005 0 0 0 0 N024 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A4 N004 0 0 0 0 N016 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A39 N020 0 0 0 0 N021 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A81 N027 0 0 0 0 N032 0 0 BUF td={tdel1} tripdt={tripdt1}
A82 N032 0 0 0 0 N033 0 0 BUF td={tdel1} tripdt={tripdt1} ref=0.5 Vhigh={vcc1}
A73 N035 0 0 0 0 N031 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A72 N036 0 0 0 0 N035 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A31 0 N011 0 N016 0 N012 0 0 AND td={tdel1} tripdt={tripdt1}
A32 0 N024 0 N020 0 N025 0 0 AND td={tdel1} tripdt={tripdt1}
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A35 0 N012 0 N018 0 N019 0 0 AND td={1.2*tdel1} tripdt={tripdt1}
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A36 0 N017 0 N025 0 N026 0 0 AND td={1.2*tdel1} tripdt={tripdt1}
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A38 0 N020 0 N026 0 N011 0 0 AND td={tdel1} tripdt={tripdt1}
A51 0 N016 0 N027 0 N028 0 0 AND td={tdel1} tripdt={tripdt1}
A52 0 N028 N031 N030 0 N027 0 0 AND td={tdel1} tripdt={tripdt1}
A53 0 N028 0 N029 0 N030 0 0 AND td={tdel1} tripdt={tripdt1}
A54 0 N030 0 N031 0 N029 0 0 AND td={tdel1} tripdt={tripdt1}
A61 0 N038 N031 N037 0 N039 0 0 AND td={tdel1} tripdt={tripdt1}
A64 0 N042 0 N037 0 N038 0 0 AND td={tdel1} tripdt={tripdt1}
A63 0 N031 0 N038 0 N042 0 0 AND td={tdel1} tripdt={tripdt1}
A62 0 N039 N024 0 0 N037 0 0 AND td={tdel1} tripdt={tripdt1}
A84 0 N027 0 N039 0 N043 0 0 AND td={tdel1} tripdt={tripdt1}
A71 N030 N028 0 N037 N038 N036 0 0 AND td={tdel1} tripdt={tripdt1}
A22 N006 0 0 0 0 N007 0 0 BUF td={tdel1} tripdt={tripdt1}
A2 N002 0 0 0 0 N003 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A12 N009 0 0 0 0 N010 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A41 N022 0 0 0 0 0 N023 0 BUF td={tdel1} tripdt={tripdt1} ref=0.5 vhigh={vcc1}
A86 N044 0 0 0 0 0 N045 0 BUF td={tdel1} tripdt={tripdt1} ref=0.5 vhigh={vcc1}
A85 N043 0 0 0 0 N044 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
A83 N039 0 0 0 0 N040 0 0 BUF td={2*tdel1} tripdt={tripdt1} ref=0.5 Vhigh={vcc1}
A18 nf 0 0 0 0 0 N015 0 MODULATOR mark={fmax} space={fmin}
A19 N015 0 0 0 0 0 N014 0 BUF ref=0 Vhigh={vcc1} vlow=0 td={tdel1} tripdt={tripdt1}
R10 N033 N034 1k
C6 VCC N034 10p
R11 N040 N041 1k
C7 N041 0 10p
A21 0 N004 0 N005 0 N006 0 0 XOR td={tdel1} tripdt={tripdt1}
A40 N021 0 0 0 0 N022 0 0 BUF td={0.5*tdel1} tripdt={tripdt1}
B1 nf 0 V=Table(V(VCOin), 0,0, 0.9, 0, {vcc1-0.9}, 1)
R7 VCOin 0 1G
R13 VCOout N013 100
A5 0 N014 0 INH 0 0 N013 0 OR ref={vcc1/2} Vhigh={vcc1} vlow=0
R4 INH 0 1G
R3 C1A 0 1G
R9 R2 0 1G
R15 R1 0 1G
R17 C1B 0 1G
R16 VCOin 0 1G
R18 C1A 0 1G
R19 R2 0 1G
R20 R1 0 1G
R21 C1B 0 1G
B2 SIG1 0 V=V(vcch,0)*(1-tanh(v(sig,vcch)))
B3 VCCH 0 V=0.5*V(vcc,0)
R23 SIG SIG1 1e6
B4 COMP1 0 V=V(vcch,0)*(1-tanh(v(comp,vcch)))
R24 COMP COMP1 1e6
R1 0 VSS 1G
R2 0 VSS 1G
R5 N008 PC1 100
R6 N023 PC3 100
R8 N045 PCP 100
B5 N001 0 V=limit(0,V(vcoin,0),{vcc1-2})
R12 N001 DEMout 50
+LEVEL = 3
+KP = 45.3E-6
+VTO = 0.72
+TOX = 51.5E-9
+NSUB = 2.8E15
+GAMMA = 0.94e-6
+PHI = 0.65
+VMAX = 150E3
+RS = 40
+RD = 40
+XJ = 0.11E-6
+LD = 0.52E-6
+DELTA = 0.315
+THETA = 0.054
+ETA = 0.025
+KAPPA = 0.0
+WD = 0.0 )
+LEVEL = 3
+KP = 22.1E-6
+VTO = -0.71
+TOX = 51.5E-9
+NSUB = 3.3E16
+GAMMA = 0.92e-6
+PHI = 0.65
+VMAX = 970E3
+RS = 80
+RD = 80
+XJ = 0.63E-6
+LD = 0.23E-6
+DELTA = 2.24
+THETA = 0.108
+ETA = 0.322
+KAPPA = 0.0
+WD = 0.0 )

* LTspice schematic (.asc)
Version 4
SHEET 1 1984 1568
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FLAG 992 -192 PC3
IOPIN 1376 384 Out
FLAG 880 144 VCC
IOPIN 1264 720 In
FLAG 880 384 PC2
IOPIN 1264 960 Out
FLAG 992 720 PCP
IOPIN 1376 1296 Out
FLAG -976 -512 SIG1
FLAG -976 -416 COMP1
FLAG 992 -480 PC1
IOPIN 1376 96 Out
FLAG -816 32 nf
FLAG -944 192 0
FLAG -992 304 VCOin
IOPIN -608 880 In
FLAG -992 -256 VCOout
IOPIN -608 320 Out
FLAG -960 -16 0
FLAG -992 -128 INH
IOPIN -608 448 In
FLAG -992 640 C1A
IOPIN -608 1216 In
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FLAG -992 528 R2
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FLAG -832 528 0
FLAG -992 416 R1
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FLAG -832 416 0
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IOPIN -608 1328 In
FLAG -832 752 0
FLAG -704 304 VCOin
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FLAG -816 -640 0
FLAG -976 -784 SIG
IOPIN -592 -208 In
FLAG -752 -784 SIG1
FLAG -352 -640 0
FLAG -512 -784 COMP
IOPIN -128 -208 In
FLAG -288 -784 COMP1
FLAG 880 608 0
FLAG 992 -656 VSS
IOPIN 1376 -80 Out
FLAG 800 -656 0
FLAG 800 -752 0
FLAG 112 -640 0
FLAG 288 -784 DEMout
IOPIN 672 -208 Out
SYMBOL Digital\\buf1 -912 -576 R0
SYMATTR Value ref={vcc1/2}
SYMATTR InstName A1
SYMBOL Digital\\buf1 -912 -480 R0
SYMATTR Value ref={vcc1/2}
SYMATTR InstName A11
SYMBOL nmos 736 432 R0
SYMATTR InstName M1
SYMATTR Value MHCNEN
SYMATTR Value2 W=250u L=2.5u
SYMBOL pmos 736 336 M180
SYMATTR InstName M2
SYMATTR Value MHCPEN
SYMATTR Value2 W=500u L=2.4u
SYMBOL Digital\\inv -640 -576 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A3
SYMBOL Digital\\buf1 768 -544 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR SpiceLine vhigh={vcc1}
SYMATTR InstName A23
SYMATTR Value2 ref=0.5
SYMBOL Digital\\inv -640 -480 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A13
SYMBOL Digital\\inv -448 -192 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A14
SYMBOL Digital\\inv -448 -288 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A4
SYMBOL Digital\\inv 576 -256 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A39
SYMBOL Digital\\inv 384 192 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A81
SYMBOL Digital\\inv 480 192 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A82
SYMATTR Value2 ref=0.5
SYMATTR SpiceLine Vhigh={vcc1}
SYMBOL Digital\\inv -160 368 M0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A73
SYMBOL Digital\\inv -48 368 M0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A72
SYMBOL Digital\\and -192 -304 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A31
SYMBOL Digital\\and -192 -176 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A32
SYMBOL Digital\\and 16 -304 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A33
SYMBOL Digital\\and 192 -304 R0
SYMATTR Value td={1.2*tdel1} tripdt={tripdt1}
SYMATTR InstName A35
SYMBOL Digital\\and 16 -176 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A34
SYMBOL Digital\\and 192 -144 R0
SYMATTR Value td={1.2*tdel1} tripdt={tripdt1}
SYMATTR InstName A36
SYMBOL Digital\\and 352 -272 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A37
SYMBOL Digital\\and 352 -144 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A38
SYMBOL Digital\\and -192 64 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A51
SYMBOL Digital\\and -192 192 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A52
SYMBOL Digital\\and 32 144 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A53
SYMBOL Digital\\and 32 272 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A54
SYMBOL Digital\\and -192 544 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A61
SYMBOL Digital\\and 32 592 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A64
SYMBOL Digital\\and 32 464 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A63
SYMBOL Digital\\and -192 672 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A62
SYMBOL Digital\\and 496 640 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A84
SYMBOL Digital\\and 208 352 M0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A71
SYMBOL Digital\\inv 672 -544 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A22
SYMBOL Digital\\inv -752 -576 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A2
SYMBOL Digital\\inv -752 -480 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A12
SYMBOL Digital\\buf1 768 -256 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR SpiceLine vhigh={vcc1}
SYMATTR InstName A41
SYMATTR Value2 ref=0.5
SYMBOL Digital\\buf1 752 656 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR SpiceLine vhigh={vcc1}
SYMATTR InstName A86
SYMATTR Value2 ref=0.5
SYMBOL Digital\\inv 640 656 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A85
SYMBOL Digital\\inv 480 448 R0
SYMATTR Value td={2*tdel1} tripdt={tripdt1}
SYMATTR InstName A83
SYMATTR Value2 ref=0.5
SYMATTR SpiceLine Vhigh={vcc1}
SYMBOL SpecialFunctions\\modulate -784 32 R0
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SYMATTR InstName A18
SYMBOL Digital\\buf1 -640 -320 M0
SYMATTR Value ref=0 Vhigh={vcc1} vlow=0
SYMATTR InstName A19
SYMATTR Value2 td={tdel1} tripdt={tripdt1}
SYMBOL res 592 272 R270
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL cap 688 160 R0
SYMATTR Value 10p
SYMATTR InstName C6
SYMBOL res 592 528 R270
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL cap 688 528 R0
SYMATTR Value 10p
SYMATTR InstName C7
SYMBOL Digital\\xor 224 -560 R0
SYMATTR Value td={tdel1} tripdt={tripdt1}
SYMATTR InstName A21
SYMBOL Digital\\inv 672 -256 R0
SYMATTR Value td={0.5*tdel1} tripdt={tripdt1}
SYMATTR InstName A40
SYMBOL bv -944 80 R0
SYMATTR Value V=Table(V(VCOin), 0,0, 0.9, 0, {vcc1-0.9}, 1)
SYMATTR InstName B1
SYMBOL res -960 320 R270
SYMATTR InstName R7
SYMATTR Value 1G
SYMBOL res -944 -240 R270
SYMATTR InstName R13
SYMATTR Value 100
SYMBOL Digital\\or -784 -304 M0
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SYMATTR InstName A5
SYMBOL res -976 -128 R0
SYMATTR InstName R4
SYMATTR Value 1G
SYMBOL res -960 656 R270
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SYMATTR Value 1G
SYMBOL res -960 544 R270
SYMATTR InstName R9
SYMATTR Value 1G
SYMBOL res -960 432 R270
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SYMATTR Value 1G
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SYMATTR InstName R17
SYMATTR Value 1G
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SYMATTR InstName R16
SYMATTR Value 1G
SYMBOL res -672 656 R270
SYMATTR InstName R18
SYMATTR Value 1G
SYMBOL res -672 544 R270
SYMATTR InstName R19
SYMATTR Value 1G
SYMBOL res -672 432 R270
SYMATTR InstName R20
SYMATTR Value 1G
SYMBOL res -672 768 R270
SYMATTR InstName R21
SYMATTR Value 1G
SYMBOL bv -816 -768 R0
SYMATTR InstName B2
SYMATTR Value V=V(vcch,0)*(1-tanh(v(sig,vcch)))
SYMBOL bv 528 -768 R0
SYMATTR InstName B3
SYMATTR Value V=0.5*V(vcc,0)
SYMBOL res -960 -768 R270
SYMATTR InstName R23
SYMATTR Value 1e6
SYMBOL bv -352 -768 R0
SYMATTR InstName B4
SYMATTR Value V=V(vcch,0)*(1-tanh(v(comp,vcch)))
SYMBOL res -480 -768 R270
SYMATTR InstName R24
SYMATTR Value 1e6
SYMBOL res 816 -640 R270
SYMATTR InstName R1
SYMATTR Value 1G
SYMBOL res 816 -736 R270
SYMATTR InstName R2
SYMATTR Value 1G
SYMBOL res 848 -464 R270
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL res 832 -176 R270
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL res 832 736 R270
SYMATTR InstName R8
SYMATTR Value 100
SYMBOL bv 112 -768 R0
SYMATTR InstName B5
SYMATTR Value V=limit(0,V(vcoin,0),{vcc1-2})
SYMBOL res 144 -768 R270
SYMATTR InstName R12
SYMATTR Value 50