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

5.2 Occupied Bandwidth

Problem statement: Device is not transmitting within the permitted ISM occupied bandwidth.

Solution: Update signal bandwidth as needed

Deep Dive:

According to Draft ETSI EN 305 550 V2.1.0, occupied bandwidth is defined as the width of a frequency band such that, below the lower and above the upper frequency limits, the mean powers emitted are each equal to 0.5% of the total mean power of a given emission. This roughly corresponds to the –23 dBc bandwidth of the signal.

For larger bandwidth, such as the 4-GHz bandwidth, there is a large frequency jump from (64 GHz to 60 GHz) which results in undershoots, affects the settling time, and can result in failure of the –23 dBc bandwidth limit.

For example the 1300MHz use case in the bandwidth is determine as shown below, it can be changed by either changing the slope or chirp parmeter in the chirp config

Table 5-1 ProfileCFG
Bandwidth ProfileCFG
1300 MHz ar1.ProfileConfig(0, 60.25, 3.6, 3.5, 29.7,0, 0, 0, 0, 0, 0, 43.995, 1, 256, 10000, 0, 131072, 30)

Equation 14. Bandwidth = Frequency slope (MHz/uS) x Ramp end time(uS)
Equation 15. = 43.983 / 29.70
Equation 16. = 1306.3 MHz