Version 4
SHEET 1 1220 680
WIRE 320 -176 80 -176
WIRE 80 -144 80 -176
WIRE 320 -144 320 -176
WIRE 320 -32 320 -64
WIRE -352 0 -464 0
WIRE -272 0 -288 0
WIRE -144 0 -144 -80
WIRE -144 0 -192 0
WIRE -32 0 -144 0
WIRE 80 0 80 -64
WIRE 80 0 32 0
WIRE 128 0 80 0
WIRE 240 0 192 0
WIRE -144 32 -144 0
WIRE -464 48 -464 0
WIRE -464 160 -464 128
WIRE -144 160 -144 112
WIRE 240 160 240 0
FLAG -144 160 0
FLAG 320 -32 0
FLAG 240 160 0
FLAG -464 160 0
FLAG -144 -80 out
SYMBOL res 64 -160 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -160 16 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res -288 -16 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL voltage -464 32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE(0 0.56 200Meg)
SYMBOL varactor -32 16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value XSMV1234
SYMATTR Prefix X
SYMBOL voltage 320 -160 R0
SYMATTR InstName VD
SYMATTR Value {VD}
SYMBOL cap -288 -16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap 192 -16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10n
TEXT -480 -200 Left 2 !.op
TEXT -96 -368 Left 0 !*Skyworks SMV1234 Figure1 Table2 with plastic package\n \n.subckt   XSMV1234 1 2\nLS 1 3 1.7n\nCP 3 2 1.2p\nRS 3 4 0.8\nD1 4 2 D1234\n.model D1234 D(\n+ Is=1e-14 Rs=0 N=1 CJO=8.75p M=1.1 VJ=2.3\n+ EG=1.11 XTI=3 KF=0 AF=1 FC=0.5 BV=16 IBV=1e-3\n+ ISR=0 NR=2 IKF=0 NBV=1 IBVL=0 NBVL=1 TBV1=0\n+ TNOM=27)\n* Parameter FFE=1 not supported in LTspice\n.ENDS
TEXT -480 -320 Left 2 !.step param VD 0.5 15 0.5
TEXT -480 -280 Left 2 !.tran 0 50n 0 50p
TEXT -480 -240 Left 2 !.options plotwinsize=0
TEXT -480 -368 Left 2 !.four 200Meg V(out)
TEXT -480 -416 Left 2 ;.FOUR Results:  View -> SPICE Error Log