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PSpice 9.1 Current Controlled Current Source (F)

This ought to be easy, so I'm embarrased. But, can anyone clear up how to use a current-controlled current source (part "F") in PSpice 9.1? To get it to measure the controlling current, I have to connect the two measuring terminals with a resistor in between them. However, it then looks like PSpice treats the path through the CCCS as a short-circuit. So, I guess I have to attach a resistor someplace in that path. But, what value resistor? The same as the one between the two connection points? Or, do I have to come up with a combination of two parrallel resistors with an equivalent resistance equal to the resistance originally between the two connection points?

Reply to
DaveLessnau
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No resistor needed in the sensing path... it's a zero-volt voltage source.

The _output_ is a current source (selectable gain), but you need to load it with something to avoid floating node issues.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
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Reply to
Jim Thompson

Dave, The inputs don't actually exist as a pin connection in 9.1, they are just sense points. What you need the resistor for is two-fold. First, it provides a second connection point, so you don't get an unconnected pin warning. Second, if the other end is grounded, it provides a DC path to ground to prevent floating nodes. Usually, a very high value resistor prevents any loading effects.

Charlie

Reply to
Charlie Edmondson

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