An Excel Based High Frequency Transistor Amplifier Calculator

amplifier calculator

 

[Paulo] just tipped us about an Excel based high frequency transistor amplifier calculator he made. We’re guessing that some of our readers already are familiar with these class A amplifiers, commonly used to amplify small audio signals. Skipping over the fact that their efficiency is quite low — they are cheap to make, don’t require many components and usually are a great way to introduce transistors to new electronics enthusiasts. All you usually need to do is a few calculations to properly set your output signals and you’re good to go.

Things are however more complex when you are amplifying 200MHz+ signals, as all the components (complex) impedances have to be taken into account so you can get a nice amplification system. On a side note, at these frequencies your transmission lines impedances may even vary depending on how much solder and flux you left on your SMT pads along the way. [Paulo]‘s calculator will therefore compute most of the characteristics of two class A common emitter/collector amplifiers for specified loads.

 

Comments

  1. starhawk says:

    Awww, HaD already crushed his server. Anyone have a google-cached page?

  2. Todd K7TFC says:

    In addition to the virtues you mentioned for class-A amplifiers, it should be noted that they are the most linear of the amp classes, and for small-signal use, that is their most important value.

  3. tekkieneet says:

    I would like to see the amplifier that is calculated from this fed to LTSpice and get the AC analysis (transfer function plot) for checking the performance.

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