My name is Meir and I am DFAE.
One of my castomers is interested in AD9361 - RF Agile Transceiver.
I have a following question:
What is a compression point of each part of the Rx and Tx chain in RF and IF ranges?
We do not characterize individual blocks within Rx and Tx signal chains.
The device is characterized and specified as a system.
Thanks for response.
What is a compression point of the device as a system?
Tx signal chain does not compress by design.
Rx signal chain IP1dB is approximately -65dBm at maximum gain. Gain range is 90dB. 1dB compression point is a function of frequency and programmed gain table. Rx input maximum single ended input signal amplitude is +2.5dBm (referenced to 50ohms).
Could you send the data sheet that describes these parameters and major RF parameters?
In Addition, could you send the table or graph with 1dB compression point parameter vs. frequency and programmed gain?
Datasheet and other supporting documentation is available for download on Analog Devices website.
Our recommendation for obtaining 1dB compression performance data vs frequency and gain is to measure it using AD9361 evaluation platform for your exact configuration.
Thanks for the response.
Is the P1db of -65dBm is at minimum Rx chain gain?
What is the meaning of the Rx input signal of +2.5dBm? - is it absolute maximum rating?
The level is at maximum receiver gain.
Yes, it is an absolute maximum rating that should not be exceeded.
In order to better understand the performance of this component, we would like to know as follows:
1. How much gain it has on the RF part and how much on the IF part.
2. In addition, what is the dynamic range of the RF gain and the one of the IF gain?
3. For last - are the IF LPF implemented only the the output of the IF VGAs?
4. How is it possible to achieve out of band interference rejection this way?
For example: assuming that our signal BW is 200KHz, and we have an interference out of band, let's say at offset of 1MHz from our signal:
5. What would be then the P1dB at the input chain of the interference signal?
6. Do we have any filtering between the mixers output and the first level of the IF VGA?
I tried to look for this data in the datasheet, but I couldn't find any reference for that.
Thanks and Best Regards,
Could you please response?
Sorry for the delay. My initial response for some reason did not go through.
Gain can be customized by using different gain tables. The maximum gain available is 90dB.
The breakdown of gain vs signal chain block gain index is available on page 21 of AD9361 Gain control and RSSI User Guide. The document can be downloaded from ADI website.
Dynamic range can be determined by using NF from the datasheet and bandwidth the part is configured for.
NF ranges from about 2dB at lower frequencies up to approximately 4dB at the high end of the operating frequency range. Recommended input peak level for the ADC is 0.5Vpk (which determines the top of the dynamic range). AD9361 is characterized as a signal chain and there is no separate specification for the RF and IF portions of the Rx signal chain.
Selectivity is provided by a TIA single pole, low pass filter (3rd order) and digital filtering. Out of band interference is attenuated by analog filtering and handled by the ADC dynamic range.
There is no filtering between the mixer and TIA.
Our recommendation would be to use AD9361 evaluation platform configured for you exact application to determine the performance.
Thanks and Happy New Year !
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