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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> The Pwl file is empty. https://designers-guide.org/forum/YaBB.pl?num=1109780639 Message started by kamesh419 on Mar 2nd, 2005, 8:23am |
Title: The Pwl file is empty. Post by kamesh419 on Mar 2nd, 2005, 8:23am Dear all, I have modified many things compared to my last post. That is the reason i am posting a new thread. The schematic that iam working on now is http://www.cyd.liu.se/users/~kamva881/temp/circuit.jpg I tried to simulate it. It gives me an error saying (This is a part of my output.log file) Quote:
But my pwlFile5 is not empty. a part of my pwlFile5 is as follows. Quote:
I do not understand where the problem is. every thing that i do depends on this small test circuit which iam developing now. Plz help me. Thanks in advance, kamesh. |
Title: Re: The Pwl file is empty. Post by Ken Kundert on Mar 2nd, 2005, 9:41am What you included in your waveform file is a netlist description of a PWL waveform. What Spectre expects in a waveform file is simple time-value pairs, and they must consist of simple numbers, not expressions. Thus, the file should contain something like the following. 0 3 10e-9 3 10.3e-9 0 20e-9 0 ... -Ken |
Title: Re: The Pwl file is empty. Post by kamesh419 on Mar 2nd, 2005, 10:14am Thank you ken for the reply. I know that your suggestion works. by using your method i get the digital wave form and not the analog one i believe. Modelling a digital waveform can also be done by using a simple verilog testbench instead of using vpwlf sources. But the problem is i cannot model the transitions from 1-->0 and from 0-->1, like using raising and falling times. Can i make use of my netlist description of PWL waveform in any way so that i get the analog description of a wave and not a digital one ? or can i use your method to do this in any different way ? Thanks in advance, kamesh. |
Title: Re: The Pwl file is empty. Post by Ken Kundert on Mar 2nd, 2005, 10:14pm The waveform I showed is a PWL waveform, so it does transition smoothly between specified values. In this case it takes 300ps to transition between levels. -Ken |
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