Stats

  • Locked Locked
  • Replies 12
  • Subscribers 131
  • Views 10770
  • 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

Modelling and design of an optical receiver

TUKA

Dear all,

I am working on the design of an optical receiver consisting of a Transimpedance amplifier (TIA), a two stage variable gain amplifier (VGA) and an output buffer.

I am initially modelling both the TIA and the VGA using a simple verilogA behavioral model to gain some insights. I have a question regarding my behavioral model:

The TIA gives me input referred noise current and the VGA gives me input referred noise voltage. Is there any formula to convert these input referred noise quantities into an equivalent noise figure for the whole system?

Thanks!

  • TUKA
    in reply to ShawnLogan

    Dear Shawn,

    ShawnLogan said:
    I just hope they help!

    Yes, it has worked. I have used the same old flicker_noise( ) function to plot shot noise that varies with f^2.

    As you mentioned, I plotted flicker noise that varies as 1/f^(-2). I can see the parabolic shape in my plot.

    Thank you so much for your elaborative suggestions throughout this post.

    Thanks,

    Tuka

  • Andrew Beckett
    in reply to ShawnLogan
    ShawnLogan said:
    I am not sure if this was Cadence's motivation for their definition of the flicker_noise() function

    Shawn,

    It's not really us - this is part of the Verilog-AMS standard. However, many device models have similar ability to control the exponent of flicker noise (see the ef model parameter of, say, mos3 in spectre).

    Andrew

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.