Using LTSPICE simulate CMOS function

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Discussion Overview

The discussion revolves around simulating a CMOS function using LTSPICE, specifically focusing on the output function F for various input combinations. Participants are addressing a homework problem that involves both schematic design and truth table construction.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant has drawn a schematic in LTSPICE but reports difficulties in obtaining the correct output.
  • Another participant suggests that constructing a truth table might be a simpler approach than using LTSPICE.
  • A participant clarifies that the professor requires the function to be synthesized in SPICE, indicating that the waveforms produced are incorrect.
  • There is a question raised about the formulation of F, with one participant suggesting an alternative expression for F.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the best approach to the problem, with differing opinions on whether to use LTSPICE or a truth table, as well as uncertainty regarding the correct formulation of the output function F.

Contextual Notes

There may be limitations related to the clarity of the schematic, the interpretation of the output function, and the specific requirements set by the professor. The discussion does not resolve these issues.

kiz
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Homework Statement



write the output F for different combinations of input using

F= abc
F= ((ab)’+c)’


Homework Equations





The Attempt at a Solution



I've tried and have drawn the schematic but I can't get correct output righ, I am using LTspice which is not very intuitive... I have attached my schematics. thx
 

Attachments

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I haven't looked at your circuit, but why go to that trouble? Why not simply construct a truth table?
 
The professor wants it synthesized in SPICE. My waveforms look incorrect.
 
Isn't F = ((ab)' + c')'?
 

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