I am attempting to set up the AWG on my PS2204 using the function: ps2000_set_sig_gen_arbitrary
I do not need any sweeping of the frequency so the value of startdeltaphase and stopdeltaphase must be equal, and the value for deltaphaseincrement and dwelltime must both be 0, am I correct?
Having said that I am finding it cannot manage to calculate of the deltaphase necessary to abtain my desired frequency. I am using the equation as instructed:
outputFrequency = dacFrequency × ( d e l ta P h a s e /phaseAccumulatorSize)× (awgBufferSize/arbitraryWaveformSize)
With the value for the constants given in the documentation:
phaseAccumulatorSize 2^32
awgBufferSize 4096
dacFrequency 2 MHz
Is it possible that these constants are not correct for my model?
I am sure that in my arbitrary waveform file I have a single oscillation and therefore that is certainly not the source of the error.
I am obtaining a frequency 25 times larger than it should be.
How to obtain the desired frequency for the AWG

 Newbie
 Posts: 0
 Joined: Tue Nov 12, 2013 5:49 pm
Re: How to obtain the desired frequency for the AWG
Hi Fabian,
There was an error found in the delta phase calculation in the Programmer's Guide. You need to use the DDS Frequency of 48MHz (not DAC Frequency of 2MHz). A new version of the Programmer's Guide will be released in the future.
Below is the information that you need:
The formula for delta phase should be:
where
AWG_PHASE_ACCUMULATOR = 2^32
awgBufferSize = 4096
AWG_DDS_FREQUENCY = 48 MHz
I hope this helps.
There was an error found in the delta phase calculation in the Programmer's Guide. You need to use the DDS Frequency of 48MHz (not DAC Frequency of 2MHz). A new version of the Programmer's Guide will be released in the future.
Below is the information that you need:
The formula for delta phase should be:
Code: Select all
delta = ((frequency * waveformSize) / awgBufferSize) * AWG_PHASE_ACCUMULATOR * (1/AWG_DDS_FREQUENCY);
AWG_PHASE_ACCUMULATOR = 2^32
awgBufferSize = 4096
AWG_DDS_FREQUENCY = 48 MHz
I hope this helps.
Hitesh
Software Dev. Engineer
Software Dev. Engineer