Products > Test Equipment
RD JDS6600 25MHz 2-Channel DDS AW Function Signal Generator
qq354813374:
Sine wave is not 14bit, waveform data only 2048 points, the resolution is only 11bit, the waveform is very rough
pantelei4:
--- Quote from: qq354813374 on July 20, 2017, 03:33:31 am ---JDS6600 Phase does not sync
--- End quote ---
Yes :horse:
Messtechniker:
Does the JDS6600 carry a CE mark?
I'm asking, because without it German customs may
have me return the unit or scrap it at my cost which is not funny.
Yes, I know the CE story. It basically means China Export :-DD
Kleinstein:
Having 11 Bit resolution is already quite good from an simple R2R chain at the FPGA. For me it looks surprisingly good.
Medium grade DDS chips like the AD9850 only use an 10 Bit ADC, though they use a longer table (e.g. 4096 points). With just 2048 points for a period, there is limited use of more than 10 Bit resolution though.
The staircase like waveform with quite some ringing suggests that there is no good reconstruction filter. So one can expect quite some high frequency images. The fast output amplifier also has some disadvantages here.
Some jitter in the square wave is normal for directly generating the square from the FPGA.
qq354813374:
R2R resistor network to achieve 11bit resolution is indeed very good, I do not know if you have not observed 14bit signal generator, the waveform is much better than this good, the use of R2R resistor network there is a drawback, that is, noise Problem, do not know if you have not found a small signal noise is very large, because the digital signal is grounded and the analog signal ground will not be separated, so the noise in the digital signal will interfere with the analog signal. I bought the JD6600 signal generator when the seller introduced a resolution of 14bit, but the actual waveform is only 11bit, I think I was cheated, and this business with the integrity and honesty have a great relationship. |O |O |O |O
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