Programming instructions

Source Components
Multisim Component Reference Guide 1-36 ni.com
As shown, the input triangle waveform rises from 0V and the output is at its lowest value (0V
in this case), as the input crosses +5V (the upper threshold in comparator terms) the output
changes to its highest value(+2V in this case). Internally in the hysteresis block the threshold
is now changed to -5V, (the lower threshold).
The output continues to rise to a peak and then starts to decrease.
Note The output changes only when the input crosses -5V. Internally, the threshold is
changed again to the upper threshold and the process repeats.
Hysteresis Block Parameters and Defaults
Symbol Parameter Name Default Unit
ViL Input low value 0 V
ViH Input high value 1 V
H Hysteresis 0.1 -
VoL Output lower limit 0 V
VoH Output upper limit 1 V
ISD Input smoothing domain % 1 -
ComponentRef.book Page 36 Thursday, December 7, 2006 10:12 AM