Question: How do I create a noiseless resistor?
Answer: In the model statement for a resistor, there is a parameter called NM that is a noise
multiplier. To edit the NM parameter in a schematic, go to the Attribute dialog box of the resistor.
Define the MODEL attribute if it is not already defined. Highlight the MODEL attribute. Once the model
name has been defined and the attribute is highlighted, the parameter fields at the bottom of the dialog
box will become active and available for editing. NM will be in the list. This parameter multiplies the
noise that the resistor produces by its defined value. Setting NM to 0 creates a noiseless resistor.
Question: I just received a circuit from another user and when I go into transient analysis and
try to run, I get an error stating that Micro-Cap can’t find a .TOP file. How do I resolve this
error?
Answer: The .TOP file is created by the State Variables Editor and is used to store the State
Variables that initialize the start of the transient simulation. You would need to get this file from
the other user, or in the Transient Analysis Limits dialog box, you can change the State Variables option
to Zero or Leave. Changing the State Variables option will most likely give you a different simulation
result than what the other user intended since you will be beginning the transient simulation at a
different initial point. Whenever the State Variables option is set to Read, there must be a
corresponding .TOP file present.
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