LTspice simulator for circuit design

Thread Starter

whale

Joined Dec 21, 2008
110
HELLO EVERYONE,

Iam using LTspice for simulation of oscillator circuit and some how i got the right frequency and the out put is perfect. but the simulator displays the error message.

the message was "WARNING: Node N005 is floating"

please someone tell me whats it mean?

will it affect the circuit performance? and can i conform the output of circuit?
 

SgtWookie

Joined Jul 17, 2007
22,230
HELLO EVERYONE,

Iam using LTspice for simulation of oscillator circuit and some how i got the right frequency and the out put is perfect. but the simulator displays the error message.

the message was "WARNING: Node N005 is floating"
That means you have a portion of the circuit that is not connected to anything. It may just be a piece of wire that you forgot to connect to something.

In the Schematic Editor, click on View, then Zoom to Fit.

Look around for a piece of wire that isn't connected to anything.

will it affect the circuit performance? and can i conform the output of circuit?
That's hard to say without seeing the circuit. You forgot to post it.
 

SgtWookie

Joined Jul 17, 2007
22,230
Ahh, I see. You have capacitors in series.

SPICE "sees" the node between two capacitors in series as a floating node, as in an ideal component, there is no current path to ground.

In order to avoid these error messages, you can connect very high values of resistance across each capacitor. 99MEG should be high enough to not affect your circuit performance, yet will get rid of the error messages.
 

SgtWookie

Joined Jul 17, 2007
22,230
It should not affect a real-world circuit.

Go ahead and build it.

Remember that real components have tolerances; a 5% tolerance capacitor marked 10pF might be anywhere from 9.5 to 10.5pF.
 
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