On 21/03/2023 18:11, Eugene Grayver wrote:
Hello,
I want to use an external IQ mixer with an external LO. My signal is
160 MHz wide, which fits nicely into the nominal complex 200 MHz
Nyquist of the X310. Unfortunately the only daughterboards for direct
access to the ADCs are LFRX which maxes out at 30 MHz, and the
Basic-RX with a minimum of 1 MHZ.
I am thinking of spinning a custom daughter board derived from LFRX
with a wideband differential driver such as
https://www.analog.com/media/en/technical-documentation/data-sheets/6406fc.pdf or
alternatively just replacing the chip on an LFRX since these appear to
be footprint compatible.
Separately, I was looking at LFTX schematics and the part # for the
amplifier is not specified. Can somebody at Ettus/NI save me some
time and lookup that part #.
Comments?
Eugene.
I believe that it's an AD8318--which you can see in the schematics if
you zoom way in. It looks like someone typoed on the
part-number "back in the day", and it was "corrected" with the
insertion of a "3".
Anyway, I THINK the frequency response is set by the output resistor and
capacitor in that circuit. The 8138 itself has
good response out to about 100MHz--from the datasheets. So I think
the roll-off is implemented with that series R-C on
the output.
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