2n3866
I am going to design a RF power amplifier operating in 433 MHz and giving 1 W output power with 2n3866.
I am a little new to the field of RF design and amplifiers, so I have some problems in the way of design I hope you can help me about.
first I would really appreciate it if any of you had any step by step guideline for RF PA design.
Second I guess I need to know S-parameters of 2n3866 to build my amplifier but I couldn't find this
characteristic anywhere. Can anybody tell me where can I find S-parameters of the amplifier on
the web?
at last, I am a little confused about the modulation I need to use in 433 MHz frequency and
which class I have to design (A,B,C,...)
Thank you all, I hope someone can kindly help me through this
Cheers!
Modulation type doesn’t have anything with frequency used.
Modulation type depends by your communication needs (voice, video, data rate, etc)
S-parameters are for low signal and they are useless for medium-power (nonlinear) simulation.
I am attaching the Spice model of 2N3866 that you can use.
..model 2N3866 NPN (
+ IS = 9.798605E-15
+ BF = 145.568899
+ NF = 1.007933
+ VAF = 64.3030691
+ IKF = 0.3661244
+ ISE = 1.806705E-14
+ NE = 1.6207001
+ BR = 10.471
+ NR = 1.0003673
+ VAR = 8.322
+ IKR = 0.1449443
+ ISC = 3.326752E-15
+ NC = 1.1076801
+ RB = 15.986
+ IRB = 2.530217E-3
+ RBM = 0.01
+ RE = 0.02604
+ RC = 1.0359
+ CJE = 9.055532E-12
+ VJE = 0.6761546
+ MJE = 0.2754969
+ TF = 1.25476E-10
+ XTF = 13.0616413
+ VTF = 0.4699
+ ITF = 0.2828
+ PTF = 18.9645325
+ CJC = 7.054363E-12
+ VJC = 0.5769848
+ MJC = 0.3139067
+ XCJC = 1
+ TR = 5.698362E-8
+ CJS = 0
+ VJS = .75
+ MJS = 0
+ XTB = 1.831
+ EG = 1.11
+ XTI = 5.0205
+ KF = 0
+ AF = 1
+ FC = 0.9
+ )
Have you built it? I need the same....if you could make this plz contact me- buetsss@yahoo.com
Thanks vfone
buetsss, I found a very useful datasheet on some other topic which I think would help you too. If you have 2n3866A from motorola, its and old datasheet for 2n3866 containing small signal S-parameters and also large signal input and output impedances!:D all you need to do is to find the matching networks for these impedances.
Good Luck!
My problem is, I am not clear about the pin to pin connection watching the schematic diagram. Can you mail some images to my mail address please?