* SPICE netlist
D2 0 N027 VARACTOR
R1 Vbias N027 10k
C1 N011 N027 {ceq}
L1 N010 N011 {leq}
V1 Vbias 0 {vdc}
V2 N009 P001 SINE(0 100u 433e6)
V3 P001 0 SINE(0 0.18 866e6 0 0 -90)
R2 N010 N009 50
D1 0 N001 VARACTOR
R3 Vbias N001 10k
C2 N012 N001 {ceq}
L2 N011 N012 {leq}
D3 0 N028 VARACTOR
R4 Vbias N028 10k
C3 N013 N028 {ceq}
L3 N012 N013 {leq}
D4 0 N002 VARACTOR
R5 Vbias N002 10k
C4 N014 N002 {ceq}
L4 N013 N014 {leq}
D5 0 N029 VARACTOR
R6 Vbias N029 10k
C5 N015 N029 {ceq}
L5 N014 N015 {leq}
D6 0 N003 VARACTOR
R7 Vbias N003 10k
C6 N016 N003 {ceq}
L6 N015 N016 {leq}
D7 0 N030 VARACTOR
R8 Vbias N030 10k
C7 N017 N030 {ceq}
L7 N016 N017 {leq}
D8 0 N004 VARACTOR
R9 Vbias N004 10k
C8 N018 N004 {ceq}
L8 N017 N018 {leq}
D9 0 N031 VARACTOR
R10 Vbias N031 10k
C9 N019 N031 {ceq}
L9 N018 N019 {leq}
D10 0 N005 VARACTOR
R11 Vbias N005 10k
C10 N020 N005 {ceq}
L10 N019 N020 {leq}
D11 0 N032 VARACTOR
R12 Vbias N032 10k
C11 N021 N032 {ceq}
L11 N020 N021 {leq}
D12 0 N006 VARACTOR
R13 Vbias N006 10k
C12 N022 N006 {ceq}
L12 N021 N022 {leq}
D13 0 N033 VARACTOR
R14 Vbias N033 10k
C13 N023 N033 {ceq}
L13 N022 N023 {leq}
D14 0 N007 VARACTOR
R15 Vbias N007 10k
C14 N024 N007 {ceq}
L14 N023 N024 {leq}
D15 0 N034 VARACTOR
R16 Vbias N034 10k
C15 N025 N034 {ceq}
L15 N024 N025 {leq}
D16 0 N008 VARACTOR
R17 Vbias N008 10k
C16 N026 N008 {ceq}
L16 N025 N026 {leq}
D17 0 N058 VARACTOR
R18 Vbias N058 10k
C17 N043 N058 {ceq}
L17 out N043 {leq}
D18 0 N035 VARACTOR
R19 Vbias N035 10k
C18 N044 N035 {ceq}
L18 N043 N044 {leq}
D19 0 N059 VARACTOR
R20 Vbias N059 10k
C19 N045 N059 {ceq}
L19 N044 N045 {leq}
D20 0 N036 VARACTOR
R21 Vbias N036 10k
C20 N046 N036 {ceq}
L20 N045 N046 {leq}
D21 0 N060 VARACTOR
R22 Vbias N060 10k
C21 N047 N060 {ceq}
L21 N046 N047 {leq}
D22 0 N037 VARACTOR
R23 Vbias N037 10k
C22 N048 N037 {ceq}
L22 N047 N048 {leq}
D23 0 N061 VARACTOR
R24 Vbias N061 10k
C23 N049 N061 {ceq}
L23 N048 N049 {leq}
D24 0 N038 VARACTOR
R25 Vbias N038 10k
C24 N050 N038 {ceq}
L24 N049 N050 {leq}
D25 0 N062 VARACTOR
R26 Vbias N062 10k
C25 N051 N062 {ceq}
L25 N050 N051 {leq}
D26 0 N039 VARACTOR
R27 Vbias N039 10k
C26 N052 N039 {ceq}
L26 N051 N052 {leq}
D27 0 N063 VARACTOR
R28 Vbias N063 10k
C27 N053 N063 {ceq}
L27 N052 N053 {leq}
D28 0 N040 VARACTOR
R29 Vbias N040 10k
C28 N054 N040 {ceq}
L28 N053 N054 {leq}
D29 0 N064 VARACTOR
R30 Vbias N064 10k
C29 N055 N064 {ceq}
L29 N054 N055 {leq}
D30 0 N041 VARACTOR
R31 Vbias N041 10k
C30 N056 N041 {ceq}
L30 N055 N056 {leq}
D31 0 N065 VARACTOR
R32 Vbias N065 10k
C31 N057 N065 {ceq}
L31 N056 N057 {leq}
D32 0 N042 VARACTOR
R33 Vbias N042 10k
C32 N026 N042 {ceq}
L32 N057 N026 {leq}
R34 out 0 50
.param leq = 900pH
.param ceq = 4pF
.param vdc = 8V
.tran 0 1000n 0 0.2n
.four 433e6Hz 4 V(n010) V(out)

* LTspice schematic (.asc)
Version 4
SHEET 1 4272 592
WIRE -1384 -232 -1480 -232
WIRE -952 -232 -1048 -232
WIRE -520 -232 -616 -232
WIRE -88 -232 -184 -232
WIRE 344 -232 248 -232
WIRE 776 -232 680 -232
WIRE 1208 -232 1112 -232
WIRE 1640 -232 1544 -232
WIRE -1992 -168 -2136 -168
WIRE -1800 -168 -1912 -168
WIRE -1560 -168 -1720 -168
WIRE -1368 -168 -1480 -168
WIRE -1128 -168 -1288 -168
WIRE -936 -168 -1048 -168
WIRE -696 -168 -856 -168
WIRE -504 -168 -616 -168
WIRE -264 -168 -424 -168
WIRE -72 -168 -184 -168
WIRE 168 -168 8 -168
WIRE 360 -168 248 -168
WIRE 600 -168 440 -168
WIRE 792 -168 680 -168
WIRE 1032 -168 872 -168
WIRE 1224 -168 1112 -168
WIRE 1464 -168 1304 -168
WIRE 2136 -168 1544 -168
WIRE -1624 -104 -1720 -104
WIRE -1192 -104 -1288 -104
WIRE -760 -104 -856 -104
WIRE -328 -104 -424 -104
WIRE 104 -104 8 -104
WIRE 536 -104 440 -104
WIRE 968 -104 872 -104
WIRE 1400 -104 1304 -104
WIRE -1192 104 -1288 104
WIRE -760 104 -856 104
WIRE -328 104 -424 104
WIRE 104 104 8 104
WIRE 536 104 440 104
WIRE 968 104 872 104
WIRE 1400 104 1304 104
WIRE 1832 104 1736 104
WIRE -1608 168 -1736 168
WIRE -1368 168 -1528 168
WIRE -1176 168 -1288 168
WIRE -936 168 -1096 168
WIRE -744 168 -856 168
WIRE -504 168 -664 168
WIRE -312 168 -424 168
WIRE -72 168 -232 168
WIRE 120 168 8 168
WIRE 360 168 200 168
WIRE 552 168 440 168
WIRE 792 168 632 168
WIRE 984 168 872 168
WIRE 1224 168 1064 168
WIRE 1416 168 1304 168
WIRE 1656 168 1496 168
WIRE 2136 168 2136 -168
WIRE 2136 168 1736 168
WIRE -1432 232 -1528 232
WIRE -1000 232 -1096 232
WIRE -568 232 -664 232
WIRE -136 232 -232 232
WIRE 296 232 200 232
WIRE 728 232 632 232
WIRE 1160 232 1064 232
WIRE 1592 232 1496 232
FLAG -1624 -40 0
FLAG -1544 -104 Vbias
FLAG -2136 120 Vbias
FLAG -2136 200 0
FLAG -2136 -8 0
FLAG -1384 -296 0
FLAG -1304 -232 Vbias
FLAG -1192 -40 0
FLAG -1112 -104 Vbias
FLAG -952 -296 0
FLAG -872 -232 Vbias
FLAG -760 -40 0
FLAG -680 -104 Vbias
FLAG -520 -296 0
FLAG -440 -232 Vbias
FLAG -328 -40 0
FLAG -248 -104 Vbias
FLAG -88 -296 0
FLAG -8 -232 Vbias
FLAG 104 -40 0
FLAG 184 -104 Vbias
FLAG 344 -296 0
FLAG 424 -232 Vbias
FLAG 536 -40 0
FLAG 616 -104 Vbias
FLAG 776 -296 0
FLAG 856 -232 Vbias
FLAG 968 -40 0
FLAG 1048 -104 Vbias
FLAG 1208 -296 0
FLAG 1288 -232 Vbias
FLAG 1400 -40 0
FLAG 1480 -104 Vbias
FLAG 1640 -296 0
FLAG 1720 -232 Vbias
FLAG -1432 296 0
FLAG -1352 232 Vbias
FLAG -1192 40 0
FLAG -1112 104 Vbias
FLAG -1000 296 0
FLAG -920 232 Vbias
FLAG -760 40 0
FLAG -680 104 Vbias
FLAG -568 296 0
FLAG -488 232 Vbias
FLAG -328 40 0
FLAG -248 104 Vbias
FLAG -136 296 0
FLAG -56 232 Vbias
FLAG 104 40 0
FLAG 184 104 Vbias
FLAG 296 296 0
FLAG 376 232 Vbias
FLAG 536 40 0
FLAG 616 104 Vbias
FLAG 728 296 0
FLAG 808 232 Vbias
FLAG 968 40 0
FLAG 1048 104 Vbias
FLAG 1160 296 0
FLAG 1240 232 Vbias
FLAG 1400 40 0
FLAG 1480 104 Vbias
FLAG 1592 296 0
FLAG 1672 232 Vbias
FLAG 1832 40 0
FLAG 1912 104 Vbias
FLAG -1736 248 0
FLAG -1736 168 out
SYMBOL varactor -1608 -40 R180
SYMATTR InstName D2
SYMATTR Value VARACTOR
SYMBOL res -1528 -120 R90
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap -1736 -168 R0
SYMATTR InstName C1
SYMATTR Value {ceq}
SYMBOL ind -1816 -152 R270
SYMATTR InstName L1
SYMATTR Value {leq}
SYMBOL voltage -2136 104 R0
SYMATTR InstName V1
SYMATTR Value {vdc}
SYMBOL voltage -2136 -184 R0
SYMATTR InstName V2
SYMATTR Value SINE(0 100u 433e6)
SYMBOL voltage -2136 -104 R0
SYMATTR InstName V3
SYMATTR Value SINE(0 0.18 866e6 0 0 -90)
SYMBOL res -1896 -184 R90
SYMATTR InstName R2
SYMATTR Value 50
SYMBOL varactor -1368 -296 M0
SYMATTR InstName D1
SYMATTR Value VARACTOR
SYMBOL res -1288 -216 M270
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL cap -1496 -168 M180
SYMATTR InstName C2
SYMATTR Value {ceq}
SYMBOL ind -1576 -184 M90
SYMATTR InstName L2
SYMATTR Value {leq}
SYMBOL varactor -1176 -40 R180
SYMATTR InstName D3
SYMATTR Value VARACTOR
SYMBOL res -1096 -120 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL cap -1304 -168 R0
SYMATTR InstName C3
SYMATTR Value {ceq}
SYMBOL ind -1384 -152 R270
SYMATTR InstName L3
SYMATTR Value {leq}
SYMBOL varactor -936 -296 M0
SYMATTR InstName D4
SYMATTR Value VARACTOR
SYMBOL res -856 -216 M270
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL cap -1064 -168 M180
SYMATTR InstName C4
SYMATTR Value {ceq}
SYMBOL ind -1144 -184 M90
SYMATTR InstName L4
SYMATTR Value {leq}
SYMBOL varactor -744 -40 R180
SYMATTR InstName D5
SYMATTR Value VARACTOR
SYMBOL res -664 -120 R90
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL cap -872 -168 R0
SYMATTR InstName C5
SYMATTR Value {ceq}
SYMBOL ind -952 -152 R270
SYMATTR InstName L5
SYMATTR Value {leq}
SYMBOL varactor -504 -296 M0
SYMATTR InstName D6
SYMATTR Value VARACTOR
SYMBOL res -424 -216 M270
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL cap -632 -168 M180
SYMATTR InstName C6
SYMATTR Value {ceq}
SYMBOL ind -712 -184 M90
SYMATTR InstName L6
SYMATTR Value {leq}
SYMBOL varactor -312 -40 R180
SYMATTR InstName D7
SYMATTR Value VARACTOR
SYMBOL res -232 -120 R90
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL cap -440 -168 R0
SYMATTR InstName C7
SYMATTR Value {ceq}
SYMBOL ind -520 -152 R270
SYMATTR InstName L7
SYMATTR Value {leq}
SYMBOL varactor -72 -296 M0
SYMATTR InstName D8
SYMATTR Value VARACTOR
SYMBOL res 8 -216 M270
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL cap -200 -168 M180
SYMATTR InstName C8
SYMATTR Value {ceq}
SYMBOL ind -280 -184 M90
SYMATTR InstName L8
SYMATTR Value {leq}
SYMBOL varactor 120 -40 R180
SYMATTR InstName D9
SYMATTR Value VARACTOR
SYMBOL res 200 -120 R90
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL cap -8 -168 R0
SYMATTR InstName C9
SYMATTR Value {ceq}
SYMBOL ind -88 -152 R270
SYMATTR InstName L9
SYMATTR Value {leq}
SYMBOL varactor 360 -296 M0
SYMATTR InstName D10
SYMATTR Value VARACTOR
SYMBOL res 440 -216 M270
SYMATTR InstName R11
SYMATTR Value 10k
SYMBOL cap 232 -168 M180
SYMATTR InstName C10
SYMATTR Value {ceq}
SYMBOL ind 152 -184 M90
SYMATTR InstName L10
SYMATTR Value {leq}
SYMBOL varactor 552 -40 R180
SYMATTR InstName D11
SYMATTR Value VARACTOR
SYMBOL res 632 -120 R90
SYMATTR InstName R12
SYMATTR Value 10k
SYMBOL cap 424 -168 R0
SYMATTR InstName C11
SYMATTR Value {ceq}
SYMBOL ind 344 -152 R270
SYMATTR InstName L11
SYMATTR Value {leq}
SYMBOL varactor 792 -296 M0
SYMATTR InstName D12
SYMATTR Value VARACTOR
SYMBOL res 872 -216 M270
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL cap 664 -168 M180
SYMATTR InstName C12
SYMATTR Value {ceq}
SYMBOL ind 584 -184 M90
SYMATTR InstName L12
SYMATTR Value {leq}
SYMBOL varactor 984 -40 R180
SYMATTR InstName D13
SYMATTR Value VARACTOR
SYMBOL res 1064 -120 R90
SYMATTR InstName R14
SYMATTR Value 10k
SYMBOL cap 856 -168 R0
SYMATTR InstName C13
SYMATTR Value {ceq}
SYMBOL ind 776 -152 R270
SYMATTR InstName L13
SYMATTR Value {leq}
SYMBOL varactor 1224 -296 M0
SYMATTR InstName D14
SYMATTR Value VARACTOR
SYMBOL res 1304 -216 M270
SYMATTR InstName R15
SYMATTR Value 10k
SYMBOL cap 1096 -168 M180
SYMATTR InstName C14
SYMATTR Value {ceq}
SYMBOL ind 1016 -184 M90
SYMATTR InstName L14
SYMATTR Value {leq}
SYMBOL varactor 1416 -40 R180
SYMATTR InstName D15
SYMATTR Value VARACTOR
SYMBOL res 1496 -120 R90
SYMATTR InstName R16
SYMATTR Value 10k
SYMBOL cap 1288 -168 R0
SYMATTR InstName C15
SYMATTR Value {ceq}
SYMBOL ind 1208 -152 R270
SYMATTR InstName L15
SYMATTR Value {leq}
SYMBOL varactor 1656 -296 M0
SYMATTR InstName D16
SYMATTR Value VARACTOR
SYMBOL res 1736 -216 M270
SYMATTR InstName R17
SYMATTR Value 10k
SYMBOL cap 1528 -168 M180
SYMATTR InstName C16
SYMATTR Value {ceq}
SYMBOL ind 1448 -184 M90
SYMATTR InstName L16
SYMATTR Value {leq}
SYMBOL varactor -1416 296 R180
SYMATTR InstName D17
SYMATTR Value VARACTOR
SYMBOL res -1336 216 R90
SYMATTR InstName R18
SYMATTR Value 10k
SYMBOL cap -1544 168 R0
SYMATTR InstName C17
SYMATTR Value {ceq}
SYMBOL ind -1624 184 R270
SYMATTR InstName L17
SYMATTR Value {leq}
SYMBOL varactor -1176 40 M0
SYMATTR InstName D18
SYMATTR Value VARACTOR
SYMBOL res -1096 120 M270
SYMATTR InstName R19
SYMATTR Value 10k
SYMBOL cap -1304 168 M180
SYMATTR InstName C18
SYMATTR Value {ceq}
SYMBOL ind -1384 152 M90
SYMATTR InstName L18
SYMATTR Value {leq}
SYMBOL varactor -984 296 R180
SYMATTR InstName D19
SYMATTR Value VARACTOR
SYMBOL res -904 216 R90
SYMATTR InstName R20
SYMATTR Value 10k
SYMBOL cap -1112 168 R0
SYMATTR InstName C19
SYMATTR Value {ceq}
SYMBOL ind -1192 184 R270
SYMATTR InstName L19
SYMATTR Value {leq}
SYMBOL varactor -744 40 M0
SYMATTR InstName D20
SYMATTR Value VARACTOR
SYMBOL res -664 120 M270
SYMATTR InstName R21
SYMATTR Value 10k
SYMBOL cap -872 168 M180
SYMATTR InstName C20
SYMATTR Value {ceq}
SYMBOL ind -952 152 M90
SYMATTR InstName L20
SYMATTR Value {leq}
SYMBOL varactor -552 296 R180
SYMATTR InstName D21
SYMATTR Value VARACTOR
SYMBOL res -472 216 R90
SYMATTR InstName R22
SYMATTR Value 10k
SYMBOL cap -680 168 R0
SYMATTR InstName C21
SYMATTR Value {ceq}
SYMBOL ind -760 184 R270
SYMATTR InstName L21
SYMATTR Value {leq}
SYMBOL varactor -312 40 M0
SYMATTR InstName D22
SYMATTR Value VARACTOR
SYMBOL res -232 120 M270
SYMATTR InstName R23
SYMATTR Value 10k
SYMBOL cap -440 168 M180
SYMATTR InstName C22
SYMATTR Value {ceq}
SYMBOL ind -520 152 M90
SYMATTR InstName L22
SYMATTR Value {leq}
SYMBOL varactor -120 296 R180
SYMATTR InstName D23
SYMATTR Value VARACTOR
SYMBOL res -40 216 R90
SYMATTR InstName R24
SYMATTR Value 10k
SYMBOL cap -248 168 R0
SYMATTR InstName C23
SYMATTR Value {ceq}
SYMBOL ind -328 184 R270
SYMATTR InstName L23
SYMATTR Value {leq}
SYMBOL varactor 120 40 M0
SYMATTR InstName D24
SYMATTR Value VARACTOR
SYMBOL res 200 120 M270
SYMATTR InstName R25
SYMATTR Value 10k
SYMBOL cap -8 168 M180
SYMATTR InstName C24
SYMATTR Value {ceq}
SYMBOL ind -88 152 M90
SYMATTR InstName L24
SYMATTR Value {leq}
SYMBOL varactor 312 296 R180
SYMATTR InstName D25
SYMATTR Value VARACTOR
SYMBOL res 392 216 R90
SYMATTR InstName R26
SYMATTR Value 10k
SYMBOL cap 184 168 R0
SYMATTR InstName C25
SYMATTR Value {ceq}
SYMBOL ind 104 184 R270
SYMATTR InstName L25
SYMATTR Value {leq}
SYMBOL varactor 552 40 M0
SYMATTR InstName D26
SYMATTR Value VARACTOR
SYMBOL res 632 120 M270
SYMATTR InstName R27
SYMATTR Value 10k
SYMBOL cap 424 168 M180
SYMATTR InstName C26
SYMATTR Value {ceq}
SYMBOL ind 344 152 M90
SYMATTR InstName L26
SYMATTR Value {leq}
SYMBOL varactor 744 296 R180
SYMATTR InstName D27
SYMATTR Value VARACTOR
SYMBOL res 824 216 R90
SYMATTR InstName R28
SYMATTR Value 10k
SYMBOL cap 616 168 R0
SYMATTR InstName C27
SYMATTR Value {ceq}
SYMBOL ind 536 184 R270
SYMATTR InstName L27
SYMATTR Value {leq}
SYMBOL varactor 984 40 M0
SYMATTR InstName D28
SYMATTR Value VARACTOR
SYMBOL res 1064 120 M270
SYMATTR InstName R29
SYMATTR Value 10k
SYMBOL cap 856 168 M180
SYMATTR InstName C28
SYMATTR Value {ceq}
SYMBOL ind 776 152 M90
SYMATTR InstName L28
SYMATTR Value {leq}
SYMBOL varactor 1176 296 R180
SYMATTR InstName D29
SYMATTR Value VARACTOR
SYMBOL res 1256 216 R90
SYMATTR InstName R30
SYMATTR Value 10k
SYMBOL cap 1048 168 R0
SYMATTR InstName C29
SYMATTR Value {ceq}
SYMBOL ind 968 184 R270
SYMATTR InstName L29
SYMATTR Value {leq}
SYMBOL varactor 1416 40 M0
SYMATTR InstName D30
SYMATTR Value VARACTOR
SYMBOL res 1496 120 M270
SYMATTR InstName R31
SYMATTR Value 10k
SYMBOL cap 1288 168 M180
SYMATTR InstName C30
SYMATTR Value {ceq}
SYMBOL ind 1208 152 M90
SYMATTR InstName L30
SYMATTR Value {leq}
SYMBOL varactor 1608 296 R180
SYMATTR InstName D31
SYMATTR Value VARACTOR
SYMBOL res 1688 216 R90
SYMATTR InstName R32
SYMATTR Value 10k
SYMBOL cap 1480 168 R0
SYMATTR InstName C31
SYMATTR Value {ceq}
SYMBOL ind 1400 184 R270
SYMATTR InstName L31
SYMATTR Value {leq}
SYMBOL varactor 1848 40 M0
SYMATTR InstName D32
SYMATTR Value VARACTOR
SYMBOL res 1928 120 M270
SYMATTR InstName R33
SYMATTR Value 10k
SYMBOL cap 1720 168 M180
SYMATTR InstName C32
SYMATTR Value {ceq}
SYMBOL ind 1640 152 M90
SYMATTR InstName L32
SYMATTR Value {leq}
SYMBOL res -1752 152 R0
SYMATTR InstName R34
SYMATTR Value 50