Bipolar junction transistors (BJTs)

We've had several pages on FETs for a long time, now it's time for a page on bipolar junction transistors. Please write to us to add content to this page!

Bipolar tranistors have had a renaissance in microwave engineering lately. At the 2015 IEEE Compound Semicoductor IC Symposum there were may more silicon papers than GaAs, for example.

Transistor Sister, sung by Freddy "Boom Boom" Cannon back in 1961

Keysight video on modeling bipolar transistors

  Here's a video all about how to model a bipolar junction transistor from our friends at Keysight.  

Watch this video to learn:
  • The basics of bipolar junction transistor (BJT) modeling
  • A step-by-step procedure to extract the model parameters of the popular Gummel-Poon (GP) model.
  • Where you can download an example modeling project.
Not familiar with the Gummel-Poon (GP) model?  The download mentioned in the video contains a chapter from a modeling handbook just on the Gummel-Poon model. The GP model was introduced in the early 1970s and it is still widely used in electronic device modeling and is an excellent starting point for getting familiar with modeling in general.

Check it out, download the example files, and get a jumpstart on your own design!

Here's a Microwaves101 Rule of Thumb, contributed by John:

The minimum noise figure of a BJT varies quadratically with frequency, up until Fmax

This rule was quoted from Bahl, I. and Bhartia, P. 2003, Microwave Solid State Circuit Design, 2 Ed, John Wiley & Sons, New Jersey, p.377


Author : Unknown Editor