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Voltage-Controlled Current Source, Piecewise Linear

Voltage-Controlled Current Source, Piecewise Linear

Piecewise Linear VCCS Netlist Format

The format for a piecewise linear voltage-controlled current source (VCCS) is:

Gxxxx out+ out- [VCCS] PWL(1) in+ in-

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

[TC1=val] [TC2=val]

x1 y1 [... xK yK ]

Gxxxx out+ out- [VCCS] NPWL(1) in+ in-

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

[TC1=val] [TC2=val]

x1 y1 [... xK yK ]

Gxxxx out+ out- [VCCS] 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 current source. The entry VCCS is the default for the G element type. The entry PWL, NPWL, or PPWL is required to identify the piecewise linear VCVS type. NPWL simulates an N-type symmetrical bidirectional switch or transfer gate, 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 current 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 VCCS 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	Multiplier to simulate multiple elements	None	1.0
SCALE	Multiplier for current	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 VCCS Netlist Examples

Gpwl1 30 0 VCCS PWL(1) 21 0
+ 0.0 0.0
+ 0.5 0.1e-3
+ 1.0 0.2e-3
+ 4.0 4.5e-3
+ 4.5 4.75e-3
+ 5.0 5.0e-3

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