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System Simulator >
System Component Models >
Miscellaneous >
Schmitt Trigger Nonlinear (SCHMIT)

Schmitt Trigger Nonlinear (SCHMIT)

Property	Description	Units	Default	Range/Type
VIL	Lower input trigger voltage	Volt	0	(-Inf, Inf)/Real
VIH	Higher input trigger voltage	Volt	0	(-Inf, Inf)/Real
VOL	Lower output voltage	Volt	0	(-Inf, Inf)/Real
VOH	Higher output voltage	Volt	0	(-Inf, Inf)/Real
RIN	Input impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input	Input signal (real)
Output	Output signal (real)

Limits

VIL <= VIH

VOL <= VOH

Notes

1. This element is a Schmitt trigger with programmable levels. The output of this element is always a baseband signal.

2. The input voltage must actually cross the threshold before the output voltage changes. For example, a trigger VIL=0 and VIH=2, whose output is currently the ‘low’ value, will not change its output on the input sequence, 1.7V, 1.8V, 1.9V, 2.0V, 1.9V, etc.

3. The initial value of the output is VOH if the initial input is greater than VIH. The initial value of the output is VOL otherwise.

4. Example: Input and output waveforms are shown for a Schmitt trigger with the following parameters: VIL = 2, VIH = 5.6, VOL = 0, and VOH = 2.5.

Netlist Form

SCHMIT:Name n1 n2 VIL=val VIH=val VOL=val VOH=val [Rin=val][Rout=val]

Netlist Example

SCHMIT:1 1 2 VIL=13.5mv VIH=15mv VOL=0 VOH=1

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