pwl_func :
A piecewise-linear (PWL) function for xreal-typed signals.

The pwl_func primitive defines a piecewise-linear function of xreal-typed signals. With this primitive, one can define an arbitrary DC transfer function.

The piecewise-linear function is described by a set of PWL data points, which can be specified either inline using the parameter data or within a file of which name is given by the parameter ‘filename’.

The parameter data is formatted as a real array of (input, output) pairs with at least two data points: ‘{in1, out1, in2, out2, …}. For instance, if the value of data is provided as ‘{-1.0, -10.0, 1.0, 10.0}, the pwl_func primitive realizes a function of which output is:

-10.0       for input < -1.0
10*input    for -1.0 <= input < 1.0
+10.0       for input >= 1.0

When the parameter filename is defined, the primitive reads the named file that defines the parameter values in Python format. For instance, for the parameter data, its real-typed array value can be defined as following:

data = [ in1, out1,
         in2, out2,
         in3, out3,
         ...       ]

Input/Output Terminals

Name	I/O	Type	Description
out	output	xreal	output signal
in	input	xreal	input signal

Parameters

Name	Type	Default	Unit	Description
data	real array	‘{-1.0, -1.0, 1.0, 1.0}	None	PWL data points
filename	string	“”	None	parameter definition file