Tim said:
Anyone know what the following XSPICE Hysteresis Block parameters do?
input_domain
fraction
The XSPICE Software User Manual (1992) does not describe these.
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Description: The Hysteresis block is a simple buffer stage that provides
hysteresis of the
output with respect to the input. The in low and in high parameter
values specify the
center voltage or current inputs about which the hysteresis effect
operates. The output
values are limited to out lower limit and out upper limit. The value of
``hyst'' is added
to the in low and in high points in order to specify the points at which
the slope of the
hysteresis function would normally change abruptly as the input
transitions from a low to
a high value. Likewise, the value of ``hyst'' is subtracted from the in
high and in low values
in order to specify the points at which the slope of the hysteresis
function would normally
change abruptly as the input transitions from a high to a low value. In
fact, the slope of
the hysteresis function is never allowed to change abruptly but is
smoothly varied whenever
the input domain smoothing parameter is set greater than zero.
Example SPICE Usage:
a11 1 2 schmitt1
..
..
..model schmitt1 hyst(in_low=0.7 in_high=2.4 hyst=0.5
+ out_lower_limit=0.5 out_upper_limit=3.0
+ input_domain=0.01 fraction=TRUE)
****************************
The code has:
********
IOP("fraction", 6, IF_FLAG, "smoothing percent/abs switch"),
****
if (private->param[6]->element[0].bvalue == MIF_TRUE) /* Set
range to absolute value */
input_domain = input_domain * (in_high - in_low);
Kevin Aylward
[email protected]
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
"quotes with no meaning, are meaningless" - Kevin Aylward.
