Products > Test Equipment

JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)

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TheDefpom:
Yep, I did a teardown video segment too, I noticed the same things as you with all the IC's lazered off apart from a couple.

I didn't identify the FPGA oscillator frequency as I couldn't read it at the time without getting it under a microscope.

radiolistener:
here is fpga oscillator

mawyatt:
That's a nice looking AWG and the interior looks well done!! Hopefully the waveform performance is also as good!!

Maybe those that have these can do some tests that show the waveform spectral purity and possibly a 2 tone test at a few frequencies?

Best,

radiolistener:

--- Quote from: mawyatt on September 16, 2020, 05:16:56 pm ---Maybe those that have these can do some tests that show the waveform spectral purity

--- End quote ---

Here is spectrum measurement for sine 7 kHz 4 Vpp captured with PC sound card "line in" input at 192 kHz sample rate.
Main spectrum window RBW = 0.7 Hz.

The first picture is background noise of installation (sound card + cable connected to PSG9080, PSG9080 is physically disconnected from mains).


The second picture is 96 kHz span with second harmonic in the receiver bandwidth (2.7 kHz).


The third picture is zoom with first harmonic in the receiver bandwidth (2.7 kHz).

TurboTom:
Thanks @radiolistener for the teardown and the tests. Considering the price, this "Junktek" thing is really disappointing. Cheap as cheap can...

No dedicated sample memory, R-2R discrete D/A converter, (probably) marginal reconstruction filtering and no shielding at all. The power supply , especially the transformer, doesn't look too trustworthy regarding creepage distances, and performance-wise, -40dBc for the second harmonic is really less than stellar!

This generator may be okay-ish for hobby applications, but if I had to spend 170+ EUR plus possibly import VAT/taxes, I'ld rather spend 60 EUR more (all taxes included) and get Rigol's DG811 and hack it. Despite the size and the toy-like appearance, this will get you a much more mature instrument which can be considered to be the entry into the professional segment. Have a look here for a set of teardown photos of my DG811. It becomes directly obvious that this generator plays in a different league.

If you don't want to spend that kind of money, the Feeltech generators are available for about half the money that the Junktek will set you back, and are pretty well characterized on this forum and, as the common opinion goes, are pretty useful as an entry level hobby AWG (with a mod applied or two...).

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