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   Voltage-Controlled Resistor, Linear       

Voltage-Controlled Resistor, Linear

 

Linear VCR Netlist Format

The format for a linear voltage-controlled resistor (VCR) is:

Gxxxx out+ out- VCR in+ in- [TRANS=]transfactor

[MAX=val] [MIN=val] [M=val]

[TC1=val] [TC2=val] [SCALE=val]

out+ is the positive node and out- is the negative node of the resistor. VCR is required for the G element voltage-controlled resistor type. in+ and in- are the positive and negative nodes for the control voltage. The label TRANS= is optional, but the transfactor must be given. transfactor is the conversion factor from input voltage to output resistance.

 


Linear VCR Instance Parameters

Parameter

Description

Unit

Default

M

Number of elements in parallel (divisor)

None

1.0

MAX

Maximum output resistance

Ohm

None

MIN

Minimum output resistance

Ohm

None

SCALE

Multiplier for resistance

None

1.0

TC1

Linear (1st-order) temperature coefficient

°K-1

0.0

TC2

Quadratic (2nd-order) temperature coefficient

°K-2

0.0

TRANS

Conversion factor from input voltage to output resistance

Ohm/Volt

0.0


Linear VCR Netlist Example

Gres1 22 23 VCR 32 33 200 MAX=1000 MIN=50

Notes

The functional equation for the linear VCR is:

R(n+, n-) = [transfactor ´ (V(in+) - V(in-)) ´ SCALE ´ (1 + DT ´ TC1 + DT2 ´ TC2)] / M

If the result is less than MIN,

R(n+, n-) = MIN

If the result is greater than MAX,

R(n+, n-) = MAX

 

 




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