What is variable resistance called?
A variable resistor is a resistor of which the electric resistance value can be adjusted. When a variable resistor is used as a potential divider by using 3 terminals it is called a potentiometer. When only two terminals are used, it functions as a variable resistance and is called a rheostat.
How is current measured in LT Spice?
To measure voltage across a component, click on the positive node to be measured, drag the mouse to the negative node and release the mouse. Measure current – To measure the current through a component, move the mouse cursor over the component and click.
How can I model such a variable resistor in spice?
This load is modeled by a resistance that can go from a high value (thereby sinking low current) to a very low resistance that can draw a large amount. How can I model such a variable resistor (w.r.t time) in SPICE ? if a precise curve of the resistor vs time doesn’t matter .step param, which is supported in PSpice, is a good way.
How do you calculate resistance in SPICE circuit?
If MNAME is specified, then the resistance may be calculated from the process information in the model MNAME and the given LENGTH and WIDTH. If VALUE is not specified, then MNAME and LENGTH must be specified. If WIDTH is not specified, then it is taken from the default width given in the model.
How is the current controlled in a spice switch?
For the current controlled switch, the controlling current is that through the specified voltage source. The direction of positive controlling current flow is from the positive node, through the source, to the negative node. The switch model allows an almost ideal switch to be described in SPICE.
How are voltage sources used in a SPICE circuit?
A current source of positive value forces current to flow out of the N+ node, through the source, and into the N- node. Voltage sources, in addition to being used for circuit excitation, are the ‘ammeters’ for SPICE, that is, zero valued voltage sources may be inserted into the circuit for the purpose of measuring current.