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Variable Resistor

Model variable resistor

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  • Library:

  • RF Blockset / Circuit Envelope / Elements

  • Variable Resistor block

Description

TheVariable Resistorblock controls the output of RF Blockset™ feedback circuits using Simulink®controlled resistance in ohms. The minimum value of the resistance (Rmin) is an RF Blockset defined constant independent of the Simulink control signal. The block has two electrical terminals. One terminal is for the Simulink control signal and one terminal is for the RF Blockset signal.

Variable Resistorblock mask icons are dynamic and show the current state of the applied noise parameter. This table shows you how the icons on this block vary based on the state of theSimulate noiseparameter on the block.

Simulate noise:on Simulate noise:off

Variable Resistor block icon with Simulate noise is set to on.

Variable Resistor block icon with Simulate noise is set to off.

Ports

Input

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Simulink control signal, specified as a scalar.

Data Types:double

Parameters

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Select this parameter, to simulate thermal noise in the variable resistor. Then, in the配置block dialog box, also select theSimulate noisecheck box. By default, bothSimulate noisecheck boxes are selected.

This parameter inserts a current noise source with the single-sided power density of4kT/RA2/Hz, where:

  • k is the Boltzmann constant

  • T is the value of theTemperatureparameter, in degrees Kelvin. (Also located in the配置block.)

Version History

Introduced in R2017b

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Behavior changed in R2021b

See Also

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