SPRACV2 November   2020 AWR1843 , AWR2243

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background – Simple Single-Chip Applications
  3. 2Cascade Incoherence Sources and Mitigation Strategies
    1. 2.1 PCB Routing Imbalances and Device Processes
    2. 2.2 Temperature Drifts
    3. 2.3 Scheduling of Run Time Calibrations
  4. 3Enabling Cascade Coherence and Improved Phase Performance
    1. 3.1 High-Level Summary
      1. 3.1.1 Sequence of Proposed Steps and Introductory Flow Diagrams
    2. 3.2 Saving RF INIT Calibration Results at Customer Factory
      1. 3.2.1 Note on LODIST Calibration
      2. 3.2.2 TX Phase Shifter Calibration and Saving Results at Customer Factory
    3. 3.3 Corner Reflector-Based Offsets Measurement at Customer Factory
      1. 3.3.1 Corner Reflector-Based Inter-Channel Imbalances
      2. 3.3.2 Corner Reflector-Based TX Phase Shifter Errors
    4. 3.4 Restoring Customer Calibration Results In-Field
      1. 3.4.1 Restore RF INIT Calibrations Results In-Field
      2. 3.4.2 Restore TX Phase Shift Calibration Results In-Field
    5. 3.5 Host-Based Temperature Calibrations In-Field
      1. 3.5.1 Disabling AWR Devices’ Autonomous Run Time Calibrations
      2. 3.5.2 Enabling Host-Based Temperature Calibrations of Inter-Channel Imbalances
      3. 3.5.3 Switching of DSP Imbalance Data
      4. 3.5.4 Enabling TX Phase Shifter’s Host-Based Temperature Calibrations
        1. 3.5.4.1 Estimating TX Phase Shift Values at Any Temperature
        2. 3.5.4.2 Temperature Correction LUTs for AWR1843TX Phase Shifter
        3. 3.5.4.3 Temperature Correction LUTs for AWR2243 TX Phase Shifter
        4. 3.5.4.4 Restoring TX Phase Shift Values – Format Conversion
        5. 3.5.4.5 Restoring TX Phase Shift Values – Transition Timing and Constraints
        6. 3.5.4.6 Typical Post-Calibration TX Phase Shifter Accuracies
        7. 3.5.4.7 Correcting for Temperature Drift While Sweeping Across Phase Settings
        8. 3.5.4.8 Amplitude Stability Across Phase Shifter Settings
        9. 3.5.4.9 Impact of Customer PCB’s 20-GHz Sync Path Attenuation on TX Phase Shifters
      5. 3.5.5 Ambient and Device Temperatures
  5. 4Concept Illustrations
  6. 5Miscellaneous (Interference, Gain Variation, Sampling Jitter)
    1. 5.1 Handling Interference In-Field
    2. 5.2 Information on TX Power and RX Gain Drift with Temperature
    3. 5.3 Jitter Between Chirp Start and ADC Sampling Start
  7. 6Conclusion
  8.   A Appendix
    1.     A.1 Terminology
    2.     A.2 References
    3.     A.3 Flow Diagrams for Proposed Cascade Coherence Scheme
    4.     A.4 LUTs for TX Phase Shifter Temperature Drift Mitigation
    5.     A.5 Circular Shift of TX Phase Shifter Calibration Data Save and Restore APIs

A.5 Circular Shift of TX Phase Shifter Calibration Data Save and Restore APIs

As mentioned in the ICD, there is a circular shift of phase shift values needed in the saving and restoring of the phase correction codes to overcome some minor limitations inside the device’s data storage and phase shifter circuits. This behavior is different across TXs. They are described here for each TX.

For TX2 and TX3, for phase shifter setting/index n=0 to 63 corresponding to functional APIs (e.g. Profile Config, Per Chirp Phase Shifter, and so forth), the calibration data must be retrieved from/restored to following byte locations of TX2 and TX3 phase calibration data save/restore API.

Table 7-5 Circular Shift for TX2 and TX3 Phase Shift Cal Data Save/Restore API
n Desired Phase Shift Byte Locations in the Save and Restore API Data Packets
49 49*5.625deg Byte[1], byte[0]
50 50*5.625deg Byte[3], byte[2]
51 51*5.625deg Byte[5], byte[4]
: : :
62 62*5.625deg Byte[27], byte[26]
63 63*5.625deg Byte[29], byte[28]
0 0*5.625deg Byte[31], byte[30]
1 1*5.625deg Byte[33], byte[32]
2 2*5.625deg Byte[35], byte[34]
: : :
47 47*5.625deg Byte[125], byte[124]
48 48*5.625deg Byte[127], byte[126]

For TX1, for phase shifter setting/index n=0 to 63 corresponding to functional APIs (e.g. Profile Config, Per Chirp Phase Shifter, and so forth), the calibration data must be retrieved from/restored to following byte locations of TX1 phase calibration data save/restore API.

Table 7-6 Circular Shift for TX1 Phase Shift Cal Data Save/Restore API
n Desired phase shift Byte locations in the Save and Restore API data packets
17 17*5.625deg Byte[1], byte[0]
18 18*5.625deg Byte[3], byte[2]
19 19*5.625deg Byte[5], byte[4]
: : :
62 62*5.625deg Byte[91], byte[90]
63 63*5.625deg Byte[93], byte[92]
0 0*5.625deg Byte[95], byte[94]
1 1*5.625deg Byte[97], byte[96]
2 2*5.625deg Byte[99], byte[98]
: : :
15 15*5.625deg Byte[125], byte[124]
16 16*5.625deg Byte[127], byte[126]