Part Number: ADC12DL1500
Hi,
We are working on a project with direct sampling sub-nyquist receiver.
Please guide on the following points for sub-Nyquist receiver covering 0.4-6 GHz using fixed 2.5 GSPS ADC sampling:
1. Zone Mapping Issue: 0.4-6 GHz spans Zones 1→5 at 2.5 GSPS. How to handle multi-zone aliasing in FPGA processing on multiple Nyquist zones using sub-nyquist sampling?
2. Zone Overlap Resolution: Multiple input frequencies (ex: 1.0 GHz Zone 1 vs 4.0 GHz Zone 4) both alias to same 1.0 GHz baseband. Can you suggest some digital disambiguation techniques?
3. RF Pre-Filtering: What filter bandwidth/roll-off needed before ADC to minimize adjacent zone leakage while preserving 1 GHz IBW?
4. Digital Processing: For mixed-zone signals reaching ADC simultaneously, how should FPGA prioritize/segment aliased spectrum?
5. Spurious Management: Expected intermodulation when signals coexist at 2.5 GSPS input? Mitigation in analog vs digital domain?
6. Timestamping: How to maintain timing accuracy when signals from different zones arrive with different aliasing delays?
7. Practical Approach: Is there an Industry-standard method for wideband (0.4-6 GHz) receiver using single 2.5 GSPS ADC - zone folding acceptance or preselective filtering?
8. Reference Design: Any TI app notes showing 6+ GHz coverage using <3 GSPS sampling with multi-zone digital reconstruction?
Need practical data handling strategy for this exact scenario.
Thanks,
Kiranjit
