Waveform Parameters -
To generate a waveform, input the desired waveform parameters. The required parameters are described in this section.Define the Input Clock
Entering the correct input clock frequency is pivotal to correct waveform generation. The Start, Stop, and Step parameters are dependent upon the input clock frequency value. Notice that the frequency word in hexadecimal can represent various frequencies in Hz if the input clock frequency is altered. The maximum input clock that Euvis supports is 2.0 GHz.
Define the Marker
Specify the marker start position and the width of the marker. Please note that both parameters are specified in hexadecimal so if you wanted a marker length of "10" in decimal, then you would need to enter "A" in the Width box.
Define the Chirp Parameters
A linear chirp is characterized by its start frequency, stop frequency and step frequency.
Set the desired parameters in these fields to generate the desired chirping waveform.
The maximum frequency that the DSM202 module can chirp to is about 1 GHz with a input clock frequency of 2 GHz. Euvis does not support any input clock frequency above 2 GHz. Please note that due to fundamental sampling restrictions, the maximum output frequency (half of the input clock) corresponds to 0x7FFFFFFF. Anything above this will result in an aliased waveform and not the one you may expect.
The frequency update rate is 32 input clock periods. The DSM202 module is not able to generate waveforms that demand a higher frequency update rate.
If a higher frequency update rate is desired see the DSM303 or any of our AWG modules.
Select the Waveform Profile
Click on the corresponding radio button to select the desired waveform profile. Currently, there is
ramp and triangle to choose between. There is also an optional "level control" waveform type.
Ramp Waveform Profile
Toggle the Ramp radio button to select the ramp waveform profile. This is the default waveform profile.
The ramp waveform is a linear chirping waveform starting at the start frequency, and chirping up at intervals set by
the step frequency until it ends at the stop frequency.
Triangle Waveform Profile
Toggle the Triangle radio button to select the triangle waveform profile.
The triangle waveform starts at the start frequency, chirps up until in reaches the stop frequency, then
chirps down until it reaches the start frequency again.
Level Control Waveform Profile (Optional Add-On)
Toggle the Level radio button to select the level control waveform profile. The diagram below will help illustrate this waveform profile:
The level control waveform profile is a trigger controlled chirp waveform that chirps up when the trigger signal is high, and chirps down when the trigger signal is low. The parameters required are the "Start Frequency" (CHIRP1), "Step Frequency", and "Stop Frequency" (CHIRP2). The waveform will begin at the start frequency. The module will chirp up or down depending on the trigger signal. The module saturates at the start and stop frequencies. The chirp interval is defined by the step frequency. The module will not chirp up past the stop frequency, nor will it chirp down past the start frequency.
Generate the Waveform
Triangle Chirping Waveform in Burst Mode
Once the input clock frequency, the start frequency, the stop frequency, the step frequency, and the waveform profile is defined. The DSM202 will be ready to generate the new waveform. To run the new waveform in Free Run mode, click Abort then click Restart. To run the new waveform in Triggered Burst mode, click Abort and then Arm. The changes in the GUI are highly responsive and can be noticed through an immediate change in output.
Usage Notes
To output a single constant frequency, enter the desired frequency in the start and stop frequency parameters. Then, enter 0 for the step frequency.