Products > Test Equipment
REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
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Carrington:
Great  :)
  Marmad, you know if someone has tried to establish a BW of 300MHz by SPI command?
  And this BW was verified?
Thanks
Wim13:

--- Quote from: Carrington on July 05, 2013, 02:18:15 pm ---Great  :)
  Marmad, you know if someone has tried to establish a BW of 300MHz by SPI command?
  And this BW was verified?
Thanks

--- End quote ---

If you look at the datsheet, you must see that for the 233 Mhz bandwidth of the 2202,
the 350 Mhz options is already used. The datasheet is showing a diagram measured on
the best possible situation. I dont think you can get more out of it.
The 200 Mhz line is to narrow for the 2202.

Also because the entry of the DS 2000 is made for 1 Mohm

Carrington:
Perhaps, and -3dB @ 233MHz is due to the combination of LMH6518 @ 350MHz and the response of the stages before the LMH6518.
In such case would interesting change the MMBFJ309, N-Chanel RF Amplifier, by another similar with better frequency response.
We only need sniff the SPI of the LMH6518 to check it. Has anyone done that yet?
tinhead:

--- Quote from: Carrington on July 05, 2013, 05:00:15 pm ---Perhaps, and -3dB @ 233MHz is due to the combination of LMH6518 @ 350MHz and the response of the stages before the LMH6518.
In such case would interesting change the MMBFJ309, N-Chanel RF Amplifier, by another similar with better frequency response.
We only need sniff the SPI of the LMH6518 to check it. Has anyone done that yet?

--- End quote ---

for what? when you wish to imporve something, draw first the schmatic of the inpustage, then do some simulations and THEN (and only then) check if something can be improved. Simply "replacing" something by what so ever wonder part will not imporve anything but probably make the whole frequency response worse.
Carrington:
Hi tinhead!

I've also thought draw the schematic, but I do not know when I can do it.
And only with a picture (that is the only that I have for now) is complicated.

I think there are similarities with this:
http://elinux.org/images/c/c6/Das_oszi_schematic.pdf
See Q01_1 at page 2, and other small changes to get 200MHz of BW.
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