Stats

  • Locked Locked
  • Replies 3
  • Subscribers 62
  • Views 16874
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Gt, Gp and Ga: Significance in LNA matching

engrvip

Hi

I want to understand how spectre calculates Gt(transducer gain , Gp( power gain) and Ga(available gain).


And what is their significance i.e. how they help in understanding matching of LNA?

Regards

Vipul

  • Vipul,

    The calculations in this case are actually performed by ADE as a post-process to the s-parameter results produced by Spectre. The equations used are in the Virtuoso® Spectre® Circuit Simulator and Accelerated Parallel Simulator RF Analysis User Guide, in the chapter called AnalogLib Components Used in RF Simulation (not exactly obvious from the name that it would be here), in a section headed Reference: S-Parameter Equations.

    How you'd use these quantities in design is probably best covered by standard text books - I'm sure others can reference those which they find useful, but one would be Microwave Transistor Amplifiers, Analysis and Design by Guillermo Gonzalez [Prentice Hall]. I think I have other good references at home but that was just one I pulled out from our office library. This is not really my field of design experience, so as I said, others can probably give you better advice.

    Regards,

    Andrew.

  • In addition to what Andrew mentioned in his post, another book that describes how to use GT, GP, GA (and other gain equations) in LNA design is "Microwave Circuit Design Using Linear and Nonlinear Techniques" by Vendelin, Pavio, and Rohde.  Specifically chapters 1-4.

    best regards,

    Tawna

  • Thanks Andrew and Wilsey for providing references to further explore this topic.

    Vipul

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.