Version 4
SHEET 1 880 680
WIRE -240 224 -160 224
WIRE -128 320 -128 352
WIRE -240 240 -240 224
WIRE -160 224 -128 224
WIRE -240 448 -240 432
WIRE -240 352 -240 336
WIRE -256 336 -240 336
WIRE -240 336 -240 320
WIRE -128 256 -128 224
FLAG -128 352 0
FLAG -160 224 a
FLAG -240 448 0
FLAG -256 336 b
SYMBOL voltage -240 224 R0
WINDOW 123 23 96 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL voltage -240 336 R0
WINDOW 0 29 30 Left 0
WINDOW 3 26 89 Left 0
SYMATTR InstName V2
SYMATTR Value {bias}
SYMBOL varactor -144 320 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value D1SV331
TEXT -272 488 Left 0 !.model D1SV331 D(Is=1.5p Cjo=50.72p Vj=0.862 M=1.353 Fc=0.5 Tt=.5u Rs=0.45)\n.step param bias 1 5 1\n.ac oct 3 10e6 10.1e6