Re: multiple elements in parallel

[skmin]

 I am working on a bandgap reference circuit as a test case using Electric schematic and net listing. I have some questions occuring in a real design environment.

1. How can I change the model name of a component? For example, NMOS has 'N' as model name when netlisted. I would like to have 'nch' instead. (The spice model file has 'nch' as a name and I would not like to modify it. And I would not like to change netlist file all the time.)

2. Is it possible that I have real transistor dimension (like 0.2u or 0.2) instead of multiples of lambdas (1 when lambda is 0.2u) of technology?

3. Is it possible to display the instance name of a component (like MN1, address@hidden) in the schematic?

- SK Min

 

-----Original Message-----
From: address@hidden
To: address@hidden
Cc: address@hidden
Sent: Tue, 26 Sep 2006 9:06 PM
Subject: Re: multiple elements in parallel

At 08:01 PM 9/26/2006, you wrote: 
>How can I use multiple multiple parallel elements in the schematic? >For example, I have 20 mosfets in parallel and the net list would be >like below; 
>MN1 1 2 0 0 N L=0.8U W=20U M=20 
>20 is too many to be placed in the schematic without using 'M' >factor. Making M=400U would result in inaccuracy in current mirror >or high impedance circuits. 
 
Electric does give you control over the "M" factor in Spice. Use "Tool / Simulation (Spice) / Add Multiplier". 
 
  -Steven Rubin 
 

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