The RF-DAC digital datapath is designed to trade off performance, flexibility, and power consumption. The maximum sampling rate and usable output bandwidth rely on certain datapath configurations. Combining different function blocks, the following table lists all available RF-DAC datapath modes.
Mode 1 | Mode 1 | Mode 2 | Mode 3 | Mode 4 | ||||
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Short Name | Full Nyquist DUC | IMR Low-pass | IMR High-pass | DUC-Bypass | ||||
IMR x2 | OFF | ON | ON | OFF | ||||
Mix-Mode | OFF | ON | OFF | ON | OFF | ON | OFF | ON |
Usable Bandwidth (Fs) | 0-0.45 | 0.55-0.95 | 0-0.2 | 0.8-0.95 | 0.3-0.45 | 0.55-0.7 | 0-0.45 | 0.55-0.95 |
Reconstruction Filter | Low-pass | Band-pass | Low-pass | Band-pass | Low-pass | Band-pass | Low-pass | Band-pass |
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When Zynq UltraScale+ RFSoC Gen 1/Gen 2 suggest using the DUC with complete Nyquist zone or its bypass corresponding respectively to Mode 1 and Mode 4, the addition of Mode 2 and Mode 3 in Gen 3/DFE will allow you to go up to the maximum sampling rate of the RF-DAC including the use of DUC signal processing. This enables the best trade-off of performance and power consumption thanks to the DUC running at half-speed of the sampling rate and the additional IMR filter enabled in the RF-DAC subsystem.