Followup questions about the N310 > Currently, the tuning times are actually a bit slower than the B200/E310 > (~140 ms) because the frequency is adjusted via SW SPI commands to the > AD9371 transceiver. A future performance enhancement will be to implement > frequency tunes via GPIO lines from the FPGA.
Is the 'future performance enhancement' a matter of Ettus updating the N310 hardware or someone making a FPGA bitfile (or both)? >The fastest that the device will be ever be capable of tuning > without disabling this calibration is ~2 ms Is this ~2 ms for a small change in tuning frequency (~ 1 MHz)? Or for a large change? -Glenn Robin Coxe via USRP-users Tue, 06 Mar 2018 12:28:33 -0800 Hi Dave. The official product announcement of the USRP N310 was just posted today. The N310 is now orderable! On Mon, Mar 5, 2018 at 2:11 PM, Dave NotTelling via USRP-users < usrp-users@lists.ettus.com> wrote: > Just saw that the N310 is officially on the ettus.com website. Curious > about the following: > > - The product pages says that it's not for fast tuning. Should I > expect roughly the same tuning times as the B2x0 radios? > > Currently, the tuning times are actually a bit slower than the B200/E310 (~140 ms) because the frequency is adjusted via SW SPI commands to the AD9371 transceiver. A future performance enhancement will be to implement frequency tunes via GPIO lines from the FPGA. The AD9371 was not designed for fast frequency hopping. The AD9371 has an embedded ARM Cortex-M0 processor that orchestrates an on-chip quadrature error correction (i.e., I/Q imbalance calibration) that takes an appreciable amount of time to converge. The fastest that the device will be ever be capable of tuning without disabling this calibration is ~2 ms. -- Diftor heh smusma -Famous Vulcan Phrase ;)
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