SPICE Resistor

Model SPICE-compatible resistor

Libraries:
Simscape / Electrical / Additional Components / SPICE Passives

Description

The SPICE Resistor block represents a SPICE-compatible resistor. You can specify the resistance in one of the following ways:

As a resistance value
As process information that the block uses to calculate a resistance value

The block models temperature dependence. There are two ways to specify the resistor temperature:

When you select Device temperature for the Model temperature dependence using parameter, the resistor temperature is

$T = T_{C} + T_{O}$
where:
- T_C is the Temperature parameter value from the Environment Parameters block. If this block doesn't exist in the circuit, T_C is the default value of this parameter.
- T_O is the Offset local circuit temperature, TOFFSET parameter value.
When you select Fixed temperature for the Model temperature dependence using parameter, the resistor temperature is the Fixed circuit temperature, TFIXED parameter value.

The block adjusts the specified or calculated resistance value for temperature using the following equation:

R = R₀(1+TC1(T–T_nom)+TC2(T–T_nom)²)

Where

R₀ is the specified or calculated resistance value.
TC1 is the First order temperature coefficient, TC1 parameter value.
TC2 is the Second order temperature coefficient, TC2 parameter value.
T_nom is the Parameter extraction temperature, TMEAS parameter value.

Ports

Conserving

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+ — Positive terminal
electrical

Electrical conserving port associated with the SPICE resistor positive voltage terminal

- — Negative terminal
electrical

Electrical conserving port associated with the SPICE resistor negative voltage terminal

Parameters

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Resistance

Device scale factor, SCALE — Device scale factor
`1.0` (default)

Number of parallel resistors that the block represents. This value multiplies the output current.

Resistor parameterization — Parameterization options
`Use specified resistance` (default) | `Calculate from process information`

Select one of the following options for specifying the resistor value:

Use specified resistance — Provide the resistance value directly.
Calculate from process information — Provide process parameters that the block uses to calculate the resistance value.
When you select this option, the block calculates the resistance using the following equation:

$R = R S H * \frac{(L E N G T H - N A R R O W)}{(W I D T H - N A R R O W)}$
where:
- RSH is the Sheet resistance, RSH parameter value.
- LENGTH is the Resistor length, LENGTH parameter value.
- WIDTH is the Resistor width, WIDTH parameter value.
- NARROW is the Etch narrowing, NARROW parameter value.

Resistance, R — Resistance
`0` `Ohm` (default)

Resistance value.

Dependencies

This parameter is visible only when you select Use specified resistance for the Resistor parameterization parameter.

Sheet resistance, RSH — Resistance per square
`0` `Ohm` (default)

Resistance per square of the resistor.

Dependencies

This parameter is visible only when you select Calculate from process information for the Resistor parameterization parameter.

Resistor length, LENGTH — Resistor length
`1e-6` `m` (default)

Length dimension of the resistor.

Dependencies

This parameter is visible only when you select Calculate from process information for the Resistor parameterization parameter.

Resistor width, WIDTH — Resistor width
`1e-6` `m` (default)

Width dimension of the resistor.

Dependencies

This parameter is visible only when you select Calculate from process information for the Resistor parameterization parameter.

Etch narrowing, NARROW — Etch narrowing
`0` `m` (default)

Amount by which the resistor length and width are reduced due to side etching.

Dependencies

This parameter is visible only when you select Calculate from process information for the Resistor parameterization parameter.

Temperature

Model temperature dependence using — Temperature dependance parameterization
`Device temperature` (default) | `Fixed temperature`

Select one of the following options for modeling the resistor temperature dependence:

Device temperature — Use the device temperature, which is the Temperature parameter value (from the Environment Parameters block, if one exists in the circuit, or the default value for this block otherwise) plus the Offset local circuit temperature, TOFFSET parameter value.
Fixed temperature — Use a temperature that is independent of the circuit temperature to model temperature dependence.

First order temperature coefficient, TC1 — First order temperature coefficient
`0` `1/K` (default)

Coefficient for the linear term in the equation that the block uses to adjust the specified or calculated resistance value for temperature.

Second order temperature coefficient, TC2 — Second order temperature coefficient
`0` `1/K^2` (default)

Coefficient for the quadratic term in the equation the block uses to adjust the specified or calculated resistance value for temperature.

Offset local circuit temperature, TOFFSET — Offset local circuit temperature
`0` `K` (default)

The amount by which the resistor temperature differs from the circuit temperature.

Dependencies

This parameter is visible only when you select Device temperature for the Model temperature dependence using parameter.

Fixed circuit temperature, TFIXED — Fixed circuit temperature
`300.15` `K` (default)

The temperature at which to simulate the resistor.

Dependencies

This parameter is visible only when you select Fixed temperature for the Model temperature dependence using parameter.

SPICE Resistor

Description