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RDBE Spurious Tones

This overview presents the challenges of spurious tones in RDBE systems, highlighting initial measurements and the implications of these spurious signals. We identify the internal issues of RDBE, including crucial indicators and deeper analysis using techniques like PFBG and DDC. Various mitigation attempts are discussed, including ground isolation, DC blocking, and future work focusing on RFI shielding and custom ADC interfaces. This document aims to provide insights for further advancements in RDBE technology.

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RDBE Spurious Tones

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  1. RDBE Spurious Tones Matt Luce/Jim Jackson October 2011

  2. Overview • The Problem • Initial Measurements • Mitigation Attempts • Future Work

  3. The Problem: RDBE Internals

  4. The Problem: First Indicators

  5. The Problem: First Indicators

  6. Looking Closer w/PFBG 1.4

  7. Looking Closer w/PFBG 1.4 (PCAL)

  8. Looking Closer w/DDC 832 MHz 896 MHz

  9. Looking Closer w/bpplotter

  10. Looking Closer w/bpplotter

  11. Looking Closer: Terminated ADC inputs

  12. Mitigation I: Ground Isolation

  13. Mitigation II: DC block on 1024MHz

  14. Future Work • RFI Shielding of iADC • Custom • Foil • KATADC • Requires a new adc_interface • Potentially removes ALC box.

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