Version 4 SHEET 1 1024 704 WIRE -336 16 -448 16 WIRE -448 32 -448 16 WIRE -336 48 -336 16 WIRE 32 80 -96 80 WIRE 128 80 32 80 WIRE 240 80 128 80 WIRE 352 80 240 80 WIRE 464 80 352 80 WIRE 480 80 464 80 WIRE -96 112 -96 80 WIRE 32 112 32 80 WIRE -336 160 -336 128 WIRE -240 160 -336 160 WIRE -176 160 -240 160 WIRE -160 160 -176 160 WIRE 128 160 128 80 WIRE 240 160 240 80 WIRE 480 160 480 80 WIRE -240 176 -240 160 WIRE 352 176 352 80 WIRE -96 240 -96 208 WIRE -64 240 -96 240 WIRE 32 240 32 176 WIRE 32 240 -64 240 WIRE 32 256 32 240 WIRE -240 272 -240 240 WIRE -96 288 -96 240 WIRE -336 304 -336 160 WIRE 32 352 32 320 WIRE 128 352 128 240 WIRE 128 352 32 352 WIRE 240 352 240 240 WIRE 240 352 128 352 WIRE 352 352 352 240 WIRE 352 352 240 352 WIRE 480 352 480 240 WIRE 480 352 352 352 WIRE -464 384 -464 352 WIRE 32 384 32 352 WIRE -96 400 -96 368 WIRE -464 528 -464 464 WIRE -336 528 -336 384 WIRE -336 528 -464 528 WIRE -96 528 -96 480 WIRE -96 528 -336 528 FLAG -176 160 b FLAG -448 32 0 FLAG -64 240 e FLAG 32 384 0 FLAG -464 352 0 FLAG 464 80 Vout FLAG -240 272 0 SYMBOL voltage -464 368 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 39 56 Left 0 SYMATTR InstName Vee SYMATTR Value 10 SYMBOL res -352 288 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -352 32 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL cap -256 176 R0 WINDOW 0 44 18 Left 0 SYMATTR InstName C3 SYMATTR Value 0.01µ SYMATTR SpiceLine Lser={LS} SYMBOL ind -80 272 M0 WINDOW 3 -27 82 Left 0 WINDOW 0 -29 38 Left 0 SYMATTR Value 5µ SYMATTR InstName L2 SYMBOL res -80 384 M0 WINDOW 0 -38 43 Left 0 WINDOW 3 -51 79 Left 0 SYMATTR InstName R3 SYMATTR Value 4.3k SYMBOL cap 16 112 R0 WINDOW 0 36 32 Left 0 WINDOW 123 24 92 Left 0 SYMATTR InstName C1 SYMATTR Value 2p SYMATTR SpiceLine Lser={LS} SYMBOL cap 16 256 R0 WINDOW 0 39 31 Left 0 SYMATTR InstName C2 SYMATTR Value 33p SYMATTR SpiceLine Lser={LS} SYMBOL ind 112 144 R0 SYMATTR InstName L1 SYMATTR Value 15.8n SYMBOL res 224 144 R0 SYMATTR InstName Rres SYMATTR Value 1.59k SYMBOL cap 336 176 R0 SYMATTR InstName Cd SYMATTR Value 7.56p SYMATTR SpiceLine Lser={LS} SYMBOL res 464 144 R0 SYMATTR InstName R4 SYMATTR Value 1.59k SYMBOL npn -160 112 R0 SYMATTR InstName Q1 SYMATTR Value XQN344 SYMATTR Prefix X TEXT -912 -264 Left 0 ;.include model344.txt ; If the model is in this file. TEXT -912 -304 Left 0 !.tran 0 1u 100n 0.1n TEXT -920 -224 Left 0 !.options method=trap TEXT -912 -104 Left 0 !.subckt XQN344 c1 b1 e1\n*\n* 2SC3302 (Toshiba RF BJT)\n*\nLb b1 b 0.858n \nLc c1 c 1.5n\nLe e1 e 750p\nCpkg_be b e 0.35p \nCpkg_ce c e 0.35p\nQ1 c b e QN344\n* \n*\n.MODEL QN344 NPN (\n+ BF = 80 \n+ VAF = 50\n+ ISE = 2e-14 \n+ NE = 1.55 \n+ NF = 0.9953 \n+ TF = 30p\n+ RB = 23 \n+ CJE = 1.3p\n+ MJE = 0.33\n+ CJC = 1p\n+ MJC = 0.33\n+ IKF = 400m ) \n*+ NKF = 0.6)\n*\n*\n.ends TEXT -664 -304 Left 0 ;.tran 0 10u 100n 0.2n uic TEXT -912 -360 Left 0 !.param LS=1nH ; Series inducatnce of each capacitor TEXT -96 -384 Left 0 ;COLPITTS OSCILLATOR (400MHZ)\n \nThe maximum possible value of C2 depends on the transistor\ngain and the series inductance of the capacitors. Keep its \nvalue as high as possible, but with some reserve.\n \nThe value of Cd has to be adjusted to reach the target frequency.\n \nThe normal symbol "npn" can be used with one small \nmodification for subcircuits too. Move the cursor over transistor.\nThen press right-mouse-button and change Prefix QN to X .\nThe model can be included either with .include filename\nor just placed into the schematic as any command line. TEXT -920 -192 Left 0 !.options plotwinsize=0 ; Needed for lowest distortion in a simulation LINE Normal -64 208 -64 208 LINE Normal -64 208 -64 208 LINE Normal -64 208 -64 208 LINE Normal -64 208 -64 208 LINE Normal -64 144 -64 144