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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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