We are using AD9361 in our projects in aselsan, turkey. We want to use AD9371 in our new projects. We have the datasheet and user guide, but could not be sure about the below questions. Thank you for the answers. So that we will decide to use AD9371 or AD9361 in our new projects.

1-What is the analog filter BW for the AD9371 RX input side before the downconverter? The 3-dB BW seems to be defined as 20 MHz minimum and 100 MHz Maximum, is this correct. What is the stopband attenuation of the analog filters at the minimum and maximum 3dB BW settings?

2-What is the minimum RX inpute analog filtre bandwidths (3dB BW) of observation receivers and sniffer receivers?

3-We want to use sniffer receiver all the time, this means that the calibration on LO and I/Q can not be done. Normally, is the calibration done periodically and if yes, what is its period? Is working without calibration a problem? What could be the degradation in specifications?

4-According to the given specifications, maximum input signal level can be -14dbm (absolute maximum recommended). What is the sensistivity level? From what we can discern of the specifications, analog AGC has a 30dB range. (If is all attenuation, than ADC input would be between -14dBm and -44 dBm, but it is higher and there is the TIA in front, so we assume there is some actual gain, as weel as attenuation. Is there some attenuation (range?) as well as 30 dB amplification?

If total range due gain/attenuation is 30dB, then assuming a pessimistic EBNO (Effective Number of Bits) of 10 bits for the ADC (which is 12 bits, a typical 12 bit ADC having somewhere around 10.5 bits ENOB), we have a 30+60 dB dynamic range. Are we reading it right? If there is only attenaution and no amplification then the dynamic range is [-14dBm -104 dBm]?

Thank you. Best regards

Güzin Kurnaz

Aselsan INC.

Ankara/TURKEY

1. Yes correct , LPF BW is Between 20MHz and 100MHz. You can use the filter Wizard to simulate and check for filter rejections..

2. Observation path LPF 3dB bandwidth ranges from 20MHz to 100MHz same as main receive. Sniffer max bandwidth is 20MHz. (5MHz to 20MHz)

3. Initialization calibrations can be performed but tracking cannot be run. Performance degradation depends on many parameters like frequency change , temperature etc. Tracking is performed periodically and please see UG-992 section ORX path control (page 103 ) for more details.

4. AGC gain range is 30 dB with 17 dB gain. LNA is not part of AD9371 , Noise figure of AD9371 is provided. You can calculate cascaded NF and from that sensitivity as per your front end design (LNA, Filters S/W Etc).

ADC is a 14 bit Σ-Δ ADC.

Correction : ADC is a 16 bit Σ-Δ ADC.