SIMPLIS Parts

Digital Pulse Source

The Digital Pulse Source provides a single bit periodic digital signal. This device is most often used to generate digital clocks.

For generating multi-bit signals see the Digital Signal Source.

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Editing the Digital Pulse Source
Examples
Waveforms
Subcircuit Parameters

Model Name:	Digital Pulse Source
Simulator:		This device is compatible with the SIMPLIS simulator.
Parts Selector Menu Location:	Digital Functions \| Sources
Symbol Library:	None - the symbol is automatically generated when placed or edited.
Model File:	SIMPLIS_DIGI1.lb
Subcircuit Name:	SIMPLIS_DIGI1_D_PULSE_N_N: Without Inverted output, without Ground Reference SIMPLIS_DIGI1_D_PULSE_N_Y: Without Inverted output, with Ground Reference SIMPLIS_DIGI1_D_PULSE_Y_N: With Inverted output, without Ground Reference SIMPLIS_DIGI1_D_PULSE_Y_Y: With Inverted output, with Ground Reference
Symbol:
Multiple Selections:	Only one device at a time can be edited.

Editing the Digital Pulse Source

To configure the Digital Pulse Source, double click on the symbol to open the parameter editing dialog:

Label	Parameter Description
Period (0 for single pulse)	Pulse generator oscillation period.
Pulse Width	Time interval between the rising edge and falling edge of a the non-inverted output.
Start Delay	Delay time at which the non-inverting output transitions from a logic low to a logic high and the complementary input pin transitions from a logic high to a logic low.
Show Compl. Output Pin?	Determines whether or not a device has a complementary output.
Ground Ref	Determines whether or not a device has a ground reference pin. Any digital component that has an input or output pin connected to an analog circuit node must have its Ground Ref pin connected to an analog node. This is usually ground on the schematic. Click on the Help button for more information.

Clicking on the Interface tab displays the Analog - Digital interface parameters:

Label	Parameter Description
Output Resistance	Output resistance of each output pin
Output High Voltage	Output high voltage for each output pin
Output Low Voltage	Output low voltage for each output pin

Examples

The test circuit used to generate the waveform examples in the next section can be downloaded here: simplis_021_digitalpulsesource_example.sxsch.

Waveforms

The waveforms below were taken from the state machine example described in the SIMPLIS Lookup Table with Don't Care Input Definitions.

Subcircuit Parameters

The subcircuit parameters, parameter names, data types, ranges, units, and descriptions are in the following table. The parameter names can be used to directly generate netlist entries for the device. For example, a Digital Signal Source netlist entry without inverted output and without ground reference would be:
X$U1 5 SIMPLIS_DIGI1_D_PULSE_N_N vars: PERIOD=100n WIDTH=50n DELAY=0 ROUT=10 VOL=0 VOH=5 COMP='N' GNDREF='N'

Parameter Name	Label	Data Type	Range	Units	Parameter Description
VOH	Output High Voltage			V	Output high voltage for each output pin
VOL	Output Low Voltage			V	Output low voltage for each output pin
ROUT	Output Resistance		min: 1m	Ω	Output resistance of each output pin
PERIOD	Period (0 for single pulse)		min: 0	s	Pulse generator oscillation period.
WIDTH	Pulse Width		min: 0	s	Time interval between the rising edge and falling edge of a the non-inverted output.
DELAY	Start Delay		0 to 1024	s	Delay time at which the non-inverting output transitions from a logic low to a logic high and the complementary input pin transitions from a logic high to a logic low.