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Does ADRV9026 reach 450MHz ORX bandwidths by ADC stitching mode?

Category: Hardware
Product Number: ADRV9026

ADRV9009 allows an ADC stitching mode,which allows ORx1 and ORx2 digital paths combined to create 450MHz bandwidths.

Does ADRV9026 reach 450MHz ORX bandwidth by ADC stitching mode too?

If not,can i use ORx1 and ORx3 stitching to create 900MHz ORx bandwidths?

  • ADC stitching mode is not supported in ADRV9026. The maximum BW that can be supported by ORX path is 450MHz.

  • Thanks a lot!

    May I ask if I can understand your answer in this way?

    1. This shows that due to the stronger performance of ADRV9026, the ORx of ADRV9026 can physically reach 450MHz bandwidth without stitching.

    2. The "2 observation receivers with 2 inputs each" in the datasheet means that there are switch-like devices inside each ORX channel so that it can be used alternately by two inputs, and  they must use the receiver in turn and works at a maximum bandwidth of 450MHz.Therefore, it cannot choose to sacrifice ORX bandwidth for four-way simultaneous processing of ORX1-4. It is not like ADRV9009, which has two modes. I can choose to use ORX1 and ORX2 at the same time and work below 225MHz bandwidth, or the two channels can be connected to ORx1 through external switch to work at 450MHz through stitching.

    3. The difference in the internal implementation logic of the 450MHz bandwidth ORx channel of these two chips is because the ADC max rate of ADRV9026 is 4.915GHz, while ADRV9009 is 2GHz?

    4. Can I think that because there is no performance loss of stitching (I'm not sure if there is such loss?), if I need to analysis a ORx signal with 450MHz bandwidth, ADRV9026 has a better effect than ADRV9009?

    Ps: To add the background, I want to use ADRV9026 for a WIFI SDR system.The system needs to support at least 160MHz bandwidth (including DPD), and it would be better to support 320MHz bandwidth (maybe 320MHz DPD needs to look forward to ADI's future chips).

  • Please see our comments below:

    1. Yes, without ADC Stitching itself, the ORX path supports 450MHz of BW.

    2. Yes, there is an internal switch which switches between the external ORX1 /ORX2 RF inputs. The internal BB path is common for ORX1/ ORX2 RF inputs and similarly a separate BB path for ORX3/ ORX4 RF inputs

    3. Yes. The ADC in ADRV9026 can opearte at ~5GSPS Rate

    4. ADRV9026 by default as such supports 450MHz of BW, so there is no point of stitching here. 

    Ps: To add the background, I want to use ADRV9026 for a WIFI SDR system.The system needs to support at least 160MHz bandwidth (including DPD), and it would be better to support 320MHz bandwidth (maybe 320MHz DPD needs to look forward to ADI's future chips).

    ADRV9026 supports maximum of 200MHz TX and RX bandwidth with DPD. We have evaluated multiple PAs with different carier configurations and the reports are available here. You may have a look at the below link for more details:

     Power Amplifier Test Reports 

    Let us know if you have further questions.

  • Thanks again!

     Power Amplifier Test Reports 

    These files provide key information, which is very helpful for me to learn how to build ADI's DPD test system, and includes the selection of peripheral components.

    4. ADRV9026 by default as such supports 450MHz of BW, so there is no point of stitching here. 

    Sorry, there may be a problem with my expression, which has led to the misunderstanding of the meaning I want to express. What I want to say here is that although both ADRV9009 and ADRV9026 can achieve 450MHz ORX bandwidth, but ADRV9026 does not needs to do ADC stitching. So if I let them collect the same signal at the maximum bandwidth of 450MHz now, because ADRV9026 does not need to do ADC stitching, will ADRV9026's ORX signal processing performance be better than that of ADRV9009's through ADC stitching (for example, in the output spectrum, there will be fewer spurs when using ADRV9026)?

  • We do not have a comparison as such but i would expect ADRV9026 performance would be better as the ADC rate is higher and you will be able to use all 4 ORX channels and in case of ADRV9009, you can use only one ORX channel.

  • I will use ADRV9026,thanks a lot!