Potentiometer

Simulink controlled potentiometer

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Libraries:
RF Blockset / Circuit Envelope / Junctions

Description

The Potentiometer block models a variable resistor. The Potentiometer block uses Simulink^® signal as input control signal to vary the resistance between the positive and the negative terminals.

The equations for the potentiometer voltage–current relationships when the control signal varies between zero and one are:

$$\begin{array}{l}\text{Linear: }{V}_{pot}=I_{pot}.(R_{off}.Ctl+R_{on}.(1-Ctl))\\ \text{Logarithmic: }{V}_{pot}=I_{pot}.(C_1.\exp (C_2.Ctl)+C_3)\\ \text{Antilog: }{V}_{pot}=I_{pot}.(C_1.\log (1+C_2.Ctl)+C_3.Ctl+R_{on})\end{array}$$

• Linear, Logarithmic, Antilog — Electrical characteristic of the potentiometer.

• Ctl — Simulink signal

• Ron — Minimum resistance of the potentiometer

• Roff — Maximum resistance of the potentiometer

Parameters

Minimum resistance — Minimum input resistance of potentiometer

10 Ohm (default) | positive scalar

Minimum input resistance of the potentiometer, specified as a positive scalar in ohms.

Data Types: double

Maximum resistance — Maximum input resistance of potentiometer

1e6 Ohm (default) | positive scalar

Maximum input resistance of potentiometer, specified as a positive scalar in ohms. This value must be greater than the minimum resistance.

Data Types: double

Potentiometer type — Curve type of potentiometer

Linear (default) | Logarithmic | Antilog

Curve type of the potentiometer, specified as Linear, Logarithmic, Antilog.

Data Types: char

Percentage of resistance at half wiper — Maximum input resistance of potentiometer

positive scalar

Percentage of resistance at half wiper for logarithmic and antilog potentiometer types, specified as a positive scalar. The valid values depend on the potentiometer type:

• Logarithmic - Greater than 0 and less than 50. The default is 20.

• Antilog - Greater than 50 and less than 100. The default is 80.

Dependencies

To enable this parameter, select Logarithmic or Antilog in Potentiometer type.

Data Types: double

Version History

Introduced in R2015b