Version 4 SHEET 1 1400 1252 WIRE -96 64 -128 64 WIRE 16 64 -16 64 WIRE 128 64 80 64 WIRE 160 64 128 64 WIRE 208 64 160 64 WIRE 320 64 272 64 WIRE 352 64 320 64 WIRE 432 64 352 64 WIRE 560 64 496 64 WIRE 128 112 128 64 WIRE 352 112 352 64 WIRE 560 112 560 64 WIRE -128 160 -128 64 WIRE 128 224 128 192 WIRE -128 320 -128 240 WIRE 128 320 128 304 WIRE 128 320 -128 320 WIRE 352 320 352 192 WIRE 352 320 128 320 WIRE 560 320 560 192 WIRE 560 320 352 320 WIRE -128 336 -128 320 FLAG -128 336 0 FLAG 560 64 out FLAG 160 64 1 FLAG -128 64 in0 FLAG 320 64 2 SYMBOL varactor 272 48 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value XSMV1234 SYMATTR Prefix X SYMBOL res 112 96 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL voltage 128 208 R0 SYMATTR InstName V1 SYMATTR Value 2 SYMBOL res -112 80 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 50 SYMBOL cap 432 80 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C1 SYMATTR Value 10n SYMBOL cap 16 80 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL res 336 96 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res 544 96 R0 SYMATTR InstName R4 SYMATTR Value 50 SYMBOL voltage -128 144 R0 WINDOW 3 23 98 Left 2 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 0 SYMATTR Value2 AC 2 TEXT -144 928 Left 2 ;.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 -128 -120 Left 2 !.OP TEXT -128 -80 Left 2 !.ac dec 100 1MEG 10G TEXT -144 424 Left 2 ;Datasheet: http://www.skyworksinc.com/uploads/documents/200058Q.pdf TEXT -144 880 Left 2 ;http://www.skyworksinc.com/uploads/documents/Varactor_SPICE_Model_AN_200315C.pdf TEXT -144 480 Left 2 !.subckt XSMV1234 1 2\nLS 1 3 1.7n\nCP 3 2 1.15p\nRS 3 4 0.8\nD1 4 2 D1234\n.model D1234 D(\n+ Is=1e-14 Rs=0 N=1 CJO=8.36p M=3.96 VJ=7.95\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 -128 -208 Left 2 ;Some SPICE model parameters are different between the datasheet \nand the general SPICE description document.