| Both sides previous revisionPrevious revisionNext revision | Previous revision |
| university:tools:pluto:users:receive [10 Mar 2017 22:38] – add link Robin Getz | university:tools:pluto:users:receive [01 Feb 2021 13:33] (current) – Iulia Moldovan |
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| ===== Receive Architecture ===== | ===== Receive Architecture ===== |
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| The AD9363 receive chain is based on [[wp>Direct-conversion_receiver|Direct Conversion]] technique. | The AD9363 receive chain is based on [[wp>Direct-conversion_receiver|Direct Conversion]] technique. Although this block diagram is for the [[adi>AD9361]], it is also appropriate for the [[adi>AD9363]] found inside the ADALM-PLUTO. The difference between the two units is the tuning range, a minor missing features (DCXO, external LO are missing and the RF channel bandwidth is reduced). |
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| {{:resources:eval:user-guides:ad-fmcomms2-ebz:fmcomms2.svg?800x650|}} | {{:resources:eval:user-guides:ad-fmcomms2-ebz:ad9361.svg?950x650|}} |
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| Some things to think about: | Some things to think about: |
| * ACG is good. Please use it. | * AGC is good. Please use it. |
| * ACG needs to be set up properly so that it is good, defaults are just that - a best guess for generic waveforms. | * AGC needs to be set up properly so that it is good, defaults are just that - a best guess for generic waveforms. |
| * Half bands and FIR is there, you should use those. | * Half bands and FIR is there, you should use those. |
| * The best performance is normally running the ADC as fast as possible, and decimating as much as possible. | * The best performance is normally running the ADC as fast as possible, and decimating as much as possible. |
| * Input fidelity (how accurate is the reception) | * Input fidelity (how accurate is the reception) |
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| For the ADALM-PLUTO, the both the receiver sensitivity and input accuracy are both frequency dependent. For plots vs frequency, check out the detailed [[../devs/performance|performance section]]. | For the ADALM-PLUTO, both the receiver sensitivity and input accuracy are frequency dependent. For plots vs frequency, check out the detailed [[../devs/performance|performance section]]. |
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| This is a the output of the [[http://www.keysight.com/find/89600B|Keysight 89600 VSA software]], which is used to measure signal demodulation and complete vector signal analysis. In this case, we generate an LTE 10 (10MHz wide channel), and transmit it out the Tx port of the [[http://www.keysight.com/find/E4438C|E4438C ESG Vector Signal Generator]] and capture it on the ADALM-PLUTO's Rx port, and the save the data, and load it into the VSA software for analysis. We can measure the RF offset (frequency error = 67Hz), and how accurate the 64-QAM constellation is created (an EVM of -43 dB, or less than 0.6% RMS error) - which is pretty good (better than the AD9363 datasheet). | This is the output of the [[http://www.keysight.com/find/89600B|Keysight 89600 VSA software]], which is used to measure signal demodulation and complete vector signal analysis. In this case, we generate an LTE 10 (10MHz wide channel), and transmit it out the Tx port of the [[https://www.keysight.com/en/pd-1000004297%3Aepsg%3Apro/esg-vector-signal-generator|E4438C ESG Vector Signal Generator]] and capture it on the ADALM-PLUTO's Rx port, and then save the data, and load it into the VSA software for analysis. We can measure the RF offset (frequency error = 67Hz), and how accurate the 64-QAM constellation is created (an EVM of -43 dB, or less than 0.6% RMS error) - which is pretty good (better than the AD9363 datasheet). |
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| {{:university:tools:pluto:users:rev_b_rx_lte10.png?800|}} | {{:university:tools:pluto:users:rev_b_rx_lte10.png?800|}} |
| By changing the LO frequency, output power, output attenuation, these results will change. | By changing the LO frequency, output power, output attenuation, these results will change. |
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| | {{:university:tools:pluto:users:pluto_rx.svg?800|}} |
