[SOLVED] PSpice Error subcircuit node is floating

Status
Not open for further replies.
W

WFriedrich

Newbie level 3
Joined
Apr 5, 2016
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
24
Hello,
I have a simple circuit to test a varicap model in PSpice.
Inside the varicap model seems to be a floating node.
Any ideas how to fix this?
The circuit is this:



The varicap model is this:
Code: 
.SUBCKT VARICAP 1 2 CTRL
R1 1 3 1u
VC 3 4
EC 4 2 Value = { (1/v(ctrl))*v(int) }
GINT 0 INT Value = { I(VC) }
CINT INT 0 1
.ENDS

PSpice output with the error:
I think the internal node INT is driven only by a current source and might need a DC path (resistor) to GND.

Any ideas how to fix this would be greatly appreciated.
Thanks,
- Wolfgang.
 

The solution was the standard answer for floating notes (add a very high value resistor (100 Mega ohm or more) between that floating node and ground), just in PSpice SUBCKT syntax. The working model looks like this:

Code: 
.SUBCKT VARICAP2 1 2 CTRL
R1 1 3 1u
R2 2 INT 1G
VC 3 4
EC 4 2 Value = { (1/v(ctrl))*v(int) }
GINT 0 INT Value = { I(VC) }
CINT INT 0 1
.ENDS

Notice R2 is the high value resistor connected from INT (the internal node) to 2 (external node).

Cheers, Wolfgang.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…