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how to define a pins floating status?

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Areky_qin

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hi, guys, when u simulation your schematics, how to define a pins floating status?
you know, if a pins is floating, then hspice can report error information for there is no dc path from this pin to GND, then how to define this status? used a large resistors or cap?and what's the status of this pin? or an uncertain status? how do this status influence the circuit system?

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Areky Qin
 

niklas.zhu

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None DC path doesn't because of floating pins in most cases.
for DC path problem, i always put 1Gohm resistance to ground, however, in some cases, you should be careful with this connection, since it may lead to strange results.

i don't think it is a big problem for floating pins, because simulator can tolerate floating pins if it doesn't affect the circuit
 

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