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Voltage-Controlled Resistor, Piecewise Linear

Voltage-Controlled Resistor, Piecewise Linear

Piecewise Linear VCR Netlist Format

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

Gxxxx out+ out- VCR PWL(1) in+ in-

[DELTA=val] [SCALE=scale] [M=val]

[TC1=val] [TC2=val]

x1 y1 [... xK yK ]

Gxxxx out+ out- VCR NPWL(1) in+ in-

[DELTA=val] [SCALE=scale] [M=val]

[TC1=val] [TC2=val]

x1 y1 [... xK yK ]

Gxxxx out+ out- VCR PPWL(1) in+ in-

[DELTA=val] [SCALE=scale] [M=val]

[TC1=val] [TC2=val]

x1 y1 [... xK yK ]

out+ is the positive node and out- is the negative node of the resistor. The entry VCR is required to select the voltage-controlled resistor element type. The entry PWL, NPWL, or PPWL is required to identify the piecewise linear VCR type. NPWL simulates an N-type device, PPWL simulates the P-type device. in+ and in- are the positive and negative nodes for the control voltage.

The x y pairs are the input voltage values and the corresponding output resistance values. For intermediate values that are not in the list of x values, the simulator calculates the corresponding output by interpolation from the given values. The use of the DELTA parameter allows you to control the curvature of the interpolation to guarantee that the 1st derivative of the curve is continuous.

**Piecewise Linear VCR Instance Parameters**
Parameter	Description	Unit	Default
DELTA	Distance over which curvature is applied in the interpolation function Zero produces linear interpolation, positive values produce continuous curvature over the waveform Maximum is one-half of the smallest difference between control (input) values	None	One-fourth of the smallest difference between control (input) values
M	Divisor to simulate multiple elements	None	1.0
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

Piecewise Linear VCR Netlist Examples

GRES 30 0 VCR PWL(1) 21 0
+ 0.0 0.0
+ 0.5 10
+ 1.0 50
+ 4.0 100
+ 4.5 500
+ 5.0 1000

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