Stats

  • Locked Locked
  • Replies 5
  • Subscribers 125
  • Views 19811
  • 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

Create ideal buffer with verilogA

BaaB

Hi,

With the help of Andrew last time relating to dependent sources, yesterday I tried a similar approach to create an ideal buffer.

I tried it and tested. Everything is OK. However, I have some questions relating to the code. Could you help me clarify it?

Here is the code I used to create an ideal buffer:

subckt ibuff (in out gnd)
V1 (out gnd) bsource v=v(in,gnd)
ends ibuff


It works as expected. But how input impedance of infinity and zero output impedance is realized from the code?

I see that the ideal buffer has infinite input impedance and zero output impedance too

Parents

  • Simplest way would be to create the view in Virtuoso (File->New->CellView and then set the Type to "VerilogA"; paste in the code there). Then when you instantiate the symbol (it should prompt you to create a symbol when you exit the editor) in your schematic, it will automatically add the ahdl_include line in the netlist.

    You appear to have just specified the Verilog-A as a model file - you can't do that, because it's not in spectre syntax. It has to be included via an ahdl_include statement.

    Regards,

    Andrew.

Reply

  • Simplest way would be to create the view in Virtuoso (File->New->CellView and then set the Type to "VerilogA"; paste in the code there). Then when you instantiate the symbol (it should prompt you to create a symbol when you exit the editor) in your schematic, it will automatically add the ahdl_include line in the netlist.

    You appear to have just specified the Verilog-A as a model file - you can't do that, because it's not in spectre syntax. It has to be included via an ahdl_include statement.

    Regards,

    Andrew.

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.