Sampling Clock Generator for Discrete Filters

The Sampling Clock Generator for Discrete Filters generates the narrow pulse width TRIG signals for use with the discrete time filters. You can think of this device as a one-shot which triggers on every rising edge of the input clock. The output pulse is set by the Acquisition Time parameter.

The information in this topic refers to the latest Sampling Clock Generator for Discrete Filters which was introduced in version 8.10. In versions prior to 8.10, a similar Sampling Clock Generator exists and has the same behavior as the new version. The new version is implemented in a library file as opposed to a templatescript, but the electrical behavior is identical. If you require a clock generator for use in versions prior to 8.10, the old Sampling Clock Generator for Discrete Filters can be placed from the part selector location: Obsolete > Digital Functions > Sampling Clock Generator for Discrete Time Filters (Obsolete) .

Related topics:

In this topic:

Model Name: Sampling Clock Generator for Discrete Filters
Simulator: This device is compatible with the SIMPLIS simulator.
Parts Selector Menu Location: Digital Functions > Discrete Time Filters
Symbol Library: simplis_discrete_time_filters.sxslb
Model Library: simplis_discrete_time_filters.lb
Subcircuit Name: SIMPLIS_DTF_SCG_Y__V2
Symbol:
 
Multiple Selections: Only one device at a time can be edited.

Editing the Sampling Clock Generator for Discrete Filters

To configure the Sampling Clock Generator for Discrete Filters, follow these steps:

  1. Double click the symbol on the schematic to open the editing dialog to the Parameters tab.
  2. Make the appropriate changes to the fields described in the table below the image.
Label Parameter Description
Acquisition Time Filter acquisition time in seconds

Examples

The test circuit used to generate the waveform examples in the next section can be downloaded here: simplis_039_sclockgenerator_example.sxsch.

Waveforms

In the circuit example, the Acquisition Time for each Sampling Clock Generator is set to 1ns.

  • The CLK1 input is a 1MHz pulse source with a 50% duty cycle.
  • The CLK2 input is also a 1MHz pulse source with a 10ps pulse width.
  • The output of both sampling clock generators is a 1ns wide pulse triggered by the input clock edge, independent of the input clock pulse width.

Subcircuit Parameters

The subcircuit parameter names, data types, ranges, units, and descriptions are in the following table. The parameter names can be used to generate netlist entries for the device. For example, a valid Sampling Clock Generator for Discrete Filters netlist entry would be:

X$U1 25 24 0 SIMPLIS_DTF_SCG_Y__V2 vars: T_ACQ=1n
Parameter Name Label Data Type Range Units Parameter Description
T_ACQ Acquisition Time Number min: 1f s Filter acquisition time in seconds