Plot graph in Virtuoso Schematic Editor...

[chlee]

I am currently doing an assignment using Virtuoso Schematic Editor using Spectre analysis and analog.lib - perform dc sweep analysis for a current mirror.

I can't plot the graph for the current flowing through the transistors. Whenever I click Results > Direct Plot > Main Form in analog environment, it keeps showing "There is currently no analysis data found or selected". I have tried Ouput > To be plotted and selected the transistor and it shown nothing.

Help me please as I am new in learning to use this software and looking into tutorials makes me blurrer...


Thanks in advance

Lee

 

[dedalus]

Hi,

By default Spectre doesn't save all currents. To save currents: Outputs > To Be Saved > Select On Schematic - click on terminals of interest. After simulation you'll be able to plot currents of selected terminals.

 

[chlee]

When I click plot output in analog environment, it only shows empty graph.

I have checked the output box, both 'plot' and 'save' column show 'yes', plotting mode is 'replace'.

Please help me solve this problem...

 

[dedalus]

Locks like you didn't simulate the circuit after you had selected the outputs. Choose Simulation > "Netlist and Run" and after that click "Plot Outputs".

 

[chlee]

Sigh~~ Actually I have done that many times before... It still shows empty graph...

 

[sarge]

Hi to all, sorry if my English bad

Step by step instruction for plot currents:

For tran analysis:
**broken link removed**

In DC analysis you can't plot graph, but:
1. in ADE window click Outputs -> To Be Saved -> Select On Schematic - click on terminals of interest
2. After simulation click Tools -> Calculator
3. In calculator window click idc and select terminal of interest, after that click button "print"

**broken link removed**

 

[dedalus]

Sigh~~ Actually I have done that many times before... It still shows empty graph...

I didn't noted that you are using transistors from analogLib. Currents of these transistors (nmos, pmos) indeed cannot be saved and plotted (I don't know why). But there is a simple solution to this problem: insert zero-valued voltage source in series with transistor and plot current that flow through this source.