• Skip to main content
  • Skip to search
  • Skip to footer
Cadence Home
  • This search text may be transcribed, used, stored, or accessed by our third-party service providers per our Cookie Policy and Privacy Policy.

  1. Community Forums
  2. Custom IC Design
  3. Constant Power Source

Stats

  • Locked Locked
  • Replies 2
  • Subscribers 125
  • Views 16340
  • 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

Constant Power Source

ssarkar
ssarkar over 10 years ago

Hi,

I have searched extensively for this problem but was unable to get a related post.

Suppose I have a diode-connected mosfet connected on the drain side by a constant power source (port cell in analogLib of Virtuoso); and on the source side to a capacitor and a current-source load, like a half-wave rectifier. The constant power source ("port" cell in analogLib) takes the value of source resistance, source type (sine), source frequency, and power amplitude of the source (in dBm).

I wanted to model the whole system, which is not achievable until I know how the voltage and current behaves at the output of the constant power source. The presence of a MOSFET makes it more non-linear. It would be of great help if someone can help me with this.

Thanks in advance,

Regards,

Soumik

  • Cancel
Parents
  • ssarkar
    ssarkar over 10 years ago

    Thanks for the reply. This is really helpful, especially the "help" command. The misconceptions that got cleared:

    1) I was trying to think of the port as an antenna, and hence assumed that I am receiving the specified power at the input. According to your reply, the power that we specify in the "port" parameters only determines the voltage at the source depending on the source resistor.

    2) Initially, I thought the amplitude that I specify inside the "port" parameters is that of the internal source. According to your reply, this is the amplitude at the output during perfect matching. So I think I should calculate the source amplitude using the formula, and then consider it as fixed. Now the current should in turn depend on the load. (Earlier I was forcing the condition in my model that (voltage*current) should be equal to the input power)

    I haven't read the documentation yet, but this is what I understood from your reply.

    Thanks again,

    Regards,

    Soumik.

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
Reply
  • ssarkar
    ssarkar over 10 years ago

    Thanks for the reply. This is really helpful, especially the "help" command. The misconceptions that got cleared:

    1) I was trying to think of the port as an antenna, and hence assumed that I am receiving the specified power at the input. According to your reply, the power that we specify in the "port" parameters only determines the voltage at the source depending on the source resistor.

    2) Initially, I thought the amplitude that I specify inside the "port" parameters is that of the internal source. According to your reply, this is the amplitude at the output during perfect matching. So I think I should calculate the source amplitude using the formula, and then consider it as fixed. Now the current should in turn depend on the load. (Earlier I was forcing the condition in my model that (voltage*current) should be equal to the input power)

    I haven't read the documentation yet, but this is what I understood from your reply.

    Thanks again,

    Regards,

    Soumik.

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
Children
No Data

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.

© 2025 Cadence Design Systems, Inc. All Rights Reserved.

  • Terms of Use
  • Privacy
  • Cookie Policy
  • US Trademarks
  • Do Not Sell or Share My Personal Information