SPRACP3C November   2019  – December 2021 AWR6843 , AWR6843AOP , IWR1443 , IWR1642 , IWR6443 , IWR6843 , IWR6843AOP

 

  1.   Trademarks
  2. 1Introduction
  3. 2Typical Certification Procedure
  4. 3Regulatory Compliance Overview
    1. 3.1 European Union Regulations - Radio Equipment directive (RED)
      1. 3.1.1 Efficient Use of the Radio Spectrum (EN 305 550)
      2. 3.1.2 RF Exposure Limit - EN 62311
      3. 3.1.3 Electrical Safety - EN 62368
      4. 3.1.4 ElectroMagnetic Compatibility (EMC) - EN 301 489-1
    2. 3.2 Federal Communications Commission (FCC)
      1. 3.2.1 End Equipment and FCC Clause
      2. 3.2.2 Fundamental Emmision levels
      3. 3.2.3 Spurious Emission
      4. 3.2.4 Frequency Stability
      5. 3.2.5 Radiation Exposure Requirement
      6. 3.2.6 FCC Waiver and Other Relevant Information
    3. 3.3 Applicable Terms and Equations
      1. 3.3.1 Duty Cycle Factor
      2. 3.3.2 Effective Isotropic Radiated Power (EIRP)
      3. 3.3.3 Friis Equation
      4. 3.3.4 Far-Field Boundary
  5. 4Tools and Setup
    1. 4.1 Hardware Setup
    2. 4.2 MMWAVESTUDIO
      1. 4.2.1 Running LUA Scripts
    3. 4.3 mmWave Visualizer
    4. 4.4 IWR6843ISK-ODS Test Case
  6. 5Common Issues and Resolutions
    1. 5.1 Peak Power
    2. 5.2 Occupied Bandwidth
    3. 5.3 Spurious Emissions
      1. 5.3.1 14.4-Ghz Harmonics
      2. 5.3.2 Suggested Resolution
        1. 5.3.2.1 Hardware Measures
        2. 5.3.2.2 Software Measures
    4. 5.4 Overshoot
    5. 5.5 Frequency Stability
      1. 5.5.1 Generating CW Signal
      2. 5.5.2 Frequency Stability Over Temperature and Voltage Range
  7. 6References
  8. 7Revision History

5.3 Spurious Emissions

Problem Statement: Spurious emissions measurements show spikes at certain frequencies, resulting in failure.

Solution: Add a metal shield over the device and ensure it is properly connected to ground.

Deep Dive:

An embedded system design usually consists of various clocks and clock sources running at different frequencies. Depending on layout, these clocks can introduce noise (emissions) at fundamental frequency or multiples of fundamental frequency. Adding a shield sufficiently connected to ground around the device and clock sources creates a Faraday cage that keeps the electromagnetic field enclosed.