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

3.1.1 Efficient Use of the Radio Spectrum (EN 305 550)

GUID-A28532A3-EBD0-458E-94DE-3D22BB7BA3F3-low.pngFigure 3-1 OFR, Out of Band and Spurious Emission Frequency Limit

The following limits and tests apply:

  • Duty Cycle: The duty cycle is factored into mean power measurement when using a power meter; see section on duty cycle Section 3.3.1.
  • Permitted range of operating frequencies: See section 4.3.1 of EN 305 550 V2.1.0 ( section 7.3 EN 305 550-1 V1.2.1). This is the authorized frequency range devices are permitted to operate.
  • Operating frequency range (OFR): See section 4.3.2 of EN 305 550 V2.1.0 . This is the intentional operating frequency range of the device. The IWR6843 mmWave device falls in the 57 to 64 GHz band and can also be operated in the 61.0 GHz to 61.5 GHz bandwidth. The occupied bandwidth (OBW) is measured as the bandwidth occupying 99% of the total power in the operating frequency range.
Table 3-1 Operating Frequency Range
Bandwidth (GHz)FL (GHz)FH (GHz)
57 - 64> 57< 64
61.0 – 61.5> 61< 61.5
122 - 123> 122< 123
244 - 246> 244< 246
  • Mean Power: See section 4.3.3 of EN 305 550 V2.1.0 ( section 7.2 EN 305 550-1 V1.2.1) . Mean power is a measure of radiated power or mean equivalent isotropic Radiated power (EIRP); it refers to the highest transmitted power level during the transmission cycle. The limit for 57 to 64 GHz is 100 mW EIRP (20 dBm EIRP), same limit applies to 61.0 GHz to 61.5 GHz. When taking measurement using a signal analyzer the channel power function is used:
    Equation 1. 20dBM EIRP = 115.23 dBuV/m @ 3m
  • Mean Power spectral density: See section 4.3.4 of EN 305 550 V2.1.0 ( section 7.1 EN 305 550-1 V1.2.1). This is defined as the emitted power spectral density over the transmission bandwidth in the direction of maximum antenna gain. Limit for 57 GHz to 64 GHz is 13 dBm/MHz EIRP. No limit is defined for 61.0 GHz to 61.5 GHz.
  • Out of band (OOB) emissions: See section 4.3.5 of EN 305 550 V2.1.0 ( section 7.4 EN 305 550-1 V1.2.1). The OOB bandwidth is calculated as in Equation 2.
    Equation 2. Fsl = fc - 2.5 × OBW
Equation 3. Fsh = fc + 2.5 × OBW

Table 3-2 shows the limits and bandwidth for out of band and spurious emissions for the mmWave device operating at both the full 4-GHz bandwidth and 500-MHz bandwidth.

The occupied bandwidth (OBW) is the width of the intentional signal mean power containing 99% of the total mean power, power below and above this limit (the out of band emission) should be equal to 0.5% of the mean power. This equates to -23dBc bandwidth of the signal.

Table 3-2 Out of Band and Spurious Emissions Bandwidth
OBW/OFRPermitted operating frequency rangefslflfcfhfshOOB limit
4 GHz57 GHz to 64 GHz5260626472-20 dBm/Mhz
500 MHz(similar limits to 4 Ghz applies if operating outside of the 61 to 6.15 range )61.0 GHz to 61.5 GHz606161.2561.562.5-10 dBm/Mhz
  • Radiated spurious emissions: See section 4.3.6 of EN 305 550 V2.1.0 ( section 7.5 EN 305 550-1 V1.2.1). The spurious emission frequency range includes frequency beyond the OOB limit. The spurious emission is measured up to the 2nd harmonic of the fundamental frequency; the IWR6843 operates from 60-64 GHz, with second harmonic at 128 GHz.
  • Receiver spurious: See section 4.4.2 of EN 305 550 V2.1.0 (section 8 EN 305 550-1 V1.2.1). Per clause 4.4.2.1 the receiver spurious is only applicable when the equipment can work in receive-only mode. The test does not apply to mmWave devices as it operate in simultaneous transmit/receive mode.
  • Receiver interference signal handling: See section 4.4.3 of EN 305 550 V2.1.0. This measures the capability of the device to coexist with other radio applications transmitting within the in-band, OOB, and remote band frequency limit. The interference source should transmit at 10-dBm equivalent EIRP for in band frequency and 20-dBm equivalent EIRP for OOB and remote band frequency.
    Equation 4. In band frequency = center frequency  (fc)
    Equation 5. OOB = Fc ± OBW 
    Equation 6. Remote band = Fc ± 10 × OBW