Products > Test Equipment
SDG6052X waveform memory size
suspension:
--- Quote from: TurboTom on October 29, 2024, 09:50:32 am ---
--- Quote from: tautech on October 29, 2024, 09:16:38 am ---From the datasheet:
maximum sample rate of 2.4 GSa/s and 16-bit vertical resolution.
Do the maths.
--- End quote ---
And this data rate can apparently be achieved via the Zynq SOC's high-speed connection to the Kintex "Sample Engine" FPGA, hence on more recent specimen of the AWG, the dedicated sample memory has been "economized" :o
Whatsoever, the performance of the AWG is good and it meets the manufacturer's spec sheet data, one only needs to read carefully and interpret the information correctly... 8)
--- End quote ---
This is great info! However, if I understand correctly, Zynq chip is used for the control system/UI/waveform point generation, pc communication etc. It is not in the datapath of the Kintex FPGA and DAC which are directly connected through 8 GTH lines. My guess is that the 4 DRAM chips are not needed to give the SFDR of the device. A sample memory of width N provides -6N db reduction from fundamental to the largest noise frequency. So in order to get say -80dB reduction, one need only 14bits in lookup memory (8K samples). This does not require an external DDR (block RAM is more than enough). But then, why did they have external DDR in earlier models?
egonotto:
Hello,
I just wanted to try it, but I can't get a connection from EasyWaveX to the SDG6000 and the SDS3000X HD.
The SDG6000 is connected via USB, the SDS3000X HD via LAN.
In TrueArb mode every point is scanned. At a maximum of 300 MHz, no more than 300,000,000 points can be scanned per second.
I also wanted to try whether 20 Mpts means 20 000 000 or 20 971 520, but first I need a connection to EasyWaveX.
Best regards
egonotto
PS: After I installed NI-Visa I get a connection again.
It is 20 971 520
egonotto:
Hello,
now I could try it. The frequency displayed is the highest frequency I could set.
Best regards
egonotto
gf:
--- Quote from: suspension on October 29, 2024, 08:43:24 am ---in trueARB, is 300 the max sampling rate (MSps) or maximum bandwidth of the signal fundamental?
--- End quote ---
It is the maximum "virtual" sampling rate. TrueArb is not DDS. It reproduces the given wavetable 1:1 (i.e. with phase increment of 1 sample) at a virtual sample rate of your choice (maximum 300MSa/s). The resulting discrete-time signal (stream of samples) is then resampled/interpolated by the engine from the virtual sample rate to the output sample rate of 1.2 GSa/s.
egonotto:
--- Quote from: gf on October 29, 2024, 12:10:43 pm ---
--- Quote from: suspension on October 29, 2024, 08:43:24 am ---in trueARB, is 300 the max sampling rate (MSps) or maximum bandwidth of the signal fundamental?
--- End quote ---
It is the maximum "virtual" sampling rate. TrueArb is not DDS. It reproduces the given wavetable 1:1 (i.e. with phase increment of 1 sample) at a virtual sample rate of your choice (maximum 300MSa/s). The resulting discrete-time signal (stream of samples) is then resampled/interpolated by the engine from the virtual sample rate to the output sample rate of 1.2 GSa/s.
--- End quote ---
Hello,
Why would you resample the signal? It certainly won't get any better.
Best regards
egonotto
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version