I am investigating chopping a signal with a fast track and hold to bring a microwave signal to baseband without relying on a mixer (I can explain why if needed but I'll skip this background part for the moment).
To achieve this result I would like to fit a BasicRX board installed in a X310 with a HMC760 [1] evaluation board, clocking the latter with the signal driving the ADC in order to use the upper Nyquist zones and aliasing on purpose. My questions: * I am confused between https://files.ettus.com/schematics/x300/x3xx.pdf page 4 which shows pin 11 of J3 as DB0_RX_CLK and pin13 which seems to be grounded (if I interpret the symbol correctly), and https://files.ettus.com/schematics/basic_dbs/BasicRX.pdf which seems to connect J2 pin 11 to clk_p and pin 13 to clk_n leading to J38 pins 2 and 3 I am connecting to => is this clock a balanced (differential) or unbalanced signal? Connecting 11-13 of the BasicRX to a Minicircuits T1-1T balun and watching the output signal is not very convincing, but neither is connecting a RF probe to pin 11 either, so I am confused with this signal (signal visible when the X310 is idle, a bit more noisy when the X310 is running an acquisition flowgraph) * I understand that the X310 is sampling at 200 MS/s, but it seems that this clock signal I am looking at is 100 MHz. Am I looking at the right signal for aliasing a signal synchronously to the sampling, or should I be looking elsewhere? Thanks, best wishes, Jean-Michel [1] https://www.analog.com/media/en/technical-documentation/data-sheets/hmc760.pdf _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
