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.4 LUTs for TX Phase Shifter Temperature Drift Mitigation

This appendix section tabulates several Look-Up-Tables (LUTs) referred to in the rest of this note. The LUTs have common values, but indices differ slightly for TX1 and TX2/3. The values listed below are with single TX ON at a time. With multiple TX ON the antenna coupling between the TX could cause a secondary impact on the phase.

Table 7-2 TX Phase Shift Calibration Temperature Correction LUT for AWR1843
Phase Shift Index for TX1 Phase Shift Index for TX2 and TX3 Temperature Correction LUT (-40°C) Temperature Correction LUT (25°C) Temperature Correction LUT (85°C) Temperature Correction LUT (110°C) Temperature Correction LUT (120°C)
0 32 0.00 0.00 0.00 0.00 0.00
1 33 0.73 0.00 -0.82 -1.28 -1.53
2 34 1.95 0.00 -2.21 -3.53 -4.07
3 35 2.81 0.00 -3.19 -5.06 -5.91
4 36 3.38 0.00 -3.81 -5.98 -6.91
5 37 3.63 0.00 -4.02 -6.29 -7.29
6 38 3.64 0.00 -3.99 -6.27 -7.18
7 39 3.45 0.00 -3.70 -5.82 -6.70
8 40 3.07 0.00 -3.10 -4.92 -5.70
9 41 2.82 0.00 -2.67 -4.32 -4.99
10 42 2.46 0.00 -2.15 -3.48 -4.11
11 43 2.18 0.00 -1.72 -2.79 -3.29
12 44 1.94 0.00 -1.46 -2.28 -2.69
13 45 1.72 0.00 -1.31 -2.11 -2.39
14 46 1.60 0.00 -1.30 -2.13 -2.37
15 47 1.50 0.00 -1.41 -2.31 -2.63
16 48 1.49 0.00 -1.85 -2.93 -3.38
17 49 1.65 0.00 -2.24 -3.55 -4.12
18 50 1.94 0.00 -2.86 -4.50 -5.25
19 51 2.23 0.00 -3.29 -5.29 -6.19
20 52 2.29 0.00 -3.60 -5.76 -6.75
21 53 2.26 0.00 -3.58 -5.78 -6.77
22 54 1.95 0.00 -3.34 -5.41 -6.30
23 55 1.64 0.00 -2.83 -4.61 -5.33
24 56 1.11 0.00 -1.90 -3.13 -3.71
25 57 0.78 0.00 -1.29 -2.19 -2.62
26 58 0.36 0.00 -0.51 -0.98 -1.23
27 59 -0.02 0.00 0.07 -0.04 -0.13
28 60 -0.26 0.00 0.44 0.57 0.59
29 61 -0.41 0.00 0.57 0.81 0.89
30 62 -0.36 0.00 0.50 0.74 0.81
31 63 -0.07 0.00 0.17 0.23 0.24
32 0 0.71 0.00 -0.61 -0.98 -1.19
33 1 1.48 0.00 -1.41 -2.19 -2.60
34 2 2.62 0.00 -2.68 -4.20 -4.88
35 3 3.42 0.00 -3.55 -5.54 -6.48
36 4 3.95 0.00 -4.05 -6.38 -7.42
37 5 4.16 0.00 -4.25 -6.67 -7.74
38 6 4.18 0.00 -4.23 -6.59 -7.64
39 7 4.02 0.00 -3.94 -6.11 -7.13
40 8 3.65 0.00 -3.39 -5.33 -6.26
41 9 3.39 0.00 -3.00 -4.78 -5.61
42 10 3.05 0.00 -2.46 -4.00 -4.74
43 11 2.80 0.00 -1.94 -3.18 -3.84
44 12 2.53 0.00 -1.63 -2.69 -3.20
45 13 2.29 0.00 -1.44 -2.37 -2.83
46 14 2.09 0.00 -1.31 -2.22 -2.65
47 15 1.95 0.00 -1.33 -2.29 -2.69
48 16 1.82 0.00 -1.55 -2.65 -3.13
49 17 1.95 0.00 -1.87 -3.13 -3.68
50 18 2.25 0.00 -2.39 -4.03 -4.63
51 19 2.39 0.00 -2.83 -4.77 -5.52
52 20 2.45 0.00 -3.12 -5.23 -6.13
53 21 2.32 0.00 -3.17 -5.31 -6.19
54 22 2.00 0.00 -2.91 -4.87 -5.66
55 23 1.68 0.00 -2.32 -3.97 -4.58
56 24 1.05 0.00 -1.29 -2.33 -2.72
57 25 0.61 0.00 -0.63 -1.25 -1.51
58 26 0.08 0.00 0.18 0.07 0.01
59 27 -0.38 0.00 0.83 1.13 1.29
60 28 -0.71 0.00 1.22 1.79 2.08
61 29 -0.94 0.00 1.36 2.09 2.44
62 30 -0.97 0.00 1.22 1.94 2.29
63 31 -0.74 0.00 0.91 1.45 1.70
Table 7-3 Factory Measured Phase Shift Array at 25C for AWR2243
Phase Shift Index Factory Measured Phase Shift Array at TFactory = 25C
TX1 TX2 and TX3 76-77 GHz Band 77-81 GHz Band
0 32 0.00 0.00
1 33 8.97 8.98
2 34 17.88 17.77
3 35 25.67 25.04
4 36 32.66 31.68
5 37 38.97 37.75
6 38 44.71 43.18
7 39 50.06 48.15
8 40 55.06 52.86
9 41 60.02 57.41
10 42 64.69 61.93
11 43 69.38 66.49
12 44 74.20 71.09
13 45 79.75 75.94
14 46 84.92 81.34
15 47 90.80 87.24
16 48 97.26 93.67
17 49 104.68 100.97
18 50 111.28 107.55
19 51 117.04 113.37
20 52 122.33 118.76
21 53 127.20 123.75
22 54 132.11 128.38
23 55 136.30 132.80
24 56 140.08 137.21
25 57 144.28 141.39
26 58 148.44 145.71
27 59 152.64 150.23
28 60 157.17 154.87
29 61 162.02 159.84
30 62 167.43 165.41
31 63 173.44 171.59
32 0 180.23 178.61
33 1 188.25 186.52
34 2 195.58 193.98
35 3 202.61 200.59
36 4 208.16 206.47
37 5 213.73 211.70
38 6 218.76 216.51
39 7 223.63 221.11
40 8 228.68 225.45
41 9 232.61 229.50
42 10 236.79 233.56
43 11 240.95 237.74
44 12 245.26 241.95
45 13 249.87 246.49
46 14 254.93 251.41
47 15 260.59 256.92
48 16 266.96 263.38
49 17 274.53 271.07
50 18 282.01 278.27
51 19 287.73 284.56
52 20 293.27 290.42
53 21 298.63 296.05
54 22 303.61 301.29
55 23 308.49 306.35
56 24 313.18 311.19
57 25 317.76 315.91
58 26 322.49 320.97
59 27 327.42 326.12
60 28 332.57 331.51
61 29 338.08 337.42
62 30 344.39 343.85
63 31 351.40 351.02
Table 7-4 TX Phase Shift Calibration Temperature Correction LUT for AWR2243
Phase shift index Correction LUTs for 76-77 GHz Band Correction LUTs for band 77-81 GHz Band
TX1 TX2 & TX3 Temperature Correction LUT (-40C) Temperature Correction LUT (25C) Temperature Correction LUT (85C) Temperature Correction LUT (130C) Temperature Correction LUT (-40C) Temperature Correction LUT (25C) Temperature Correction LUT (85C) Temperature Correction LUT (130C)
0 32 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1 33 0.31 0.00 -0.60 -0.93 0.29 0.00 -0.58 -0.77
2 34 0.54 0.00 -0.89 -1.52 0.52 0.00 -1.22 -1.86
3 35 0.77 0.00 -1.12 -1.93 0.63 0.00 -1.67 -2.67
4 36 0.94 0.00 -1.33 -2.20 0.59 0.00 -1.88 -3.09
5 37 1.06 0.00 -1.45 -2.28 0.43 0.00 -1.91 -3.14
6 38 1.12 0.00 -1.43 -2.13 0.22 0.00 -1.77 -2.90
7 39 1.08 0.00 -1.24 -1.76 0.04 0.00 -1.53 -2.42
8 40 0.95 0.00 -0.93 -1.20 -0.13 0.00 -1.22 -1.78
9 41 0.81 0.00 -0.56 -0.56 -0.28 0.00 -0.88 -1.05
10 42 0.63 0.00 -0.20 0.05 -0.44 0.00 -0.55 -0.33
11 43 0.50 0.00 0.08 0.54 -0.58 0.00 -0.28 0.28
12 44 0.41 0.00 0.24 0.83 -0.71 0.00 -0.09 0.69
13 45 0.36 0.00 0.25 0.87 -0.79 0.00 0.00 0.86
14 46 0.37 0.00 0.11 0.66 -0.81 0.00 -0.01 0.76
15 47 0.45 0.00 -0.12 0.24 -0.76 0.00 -0.12 0.42
16 48 0.62 0.00 -0.42 -0.31 -0.64 0.00 -0.30 -0.09
17 49 0.84 0.00 -0.74 -0.92 -0.47 0.00 -0.51 -0.69
18 50 1.10 0.00 -1.01 -1.48 -0.29 0.00 -0.71 -1.26
19 51 1.35 0.00 -1.20 -1.92 -0.11 0.00 -0.87 -1.72
20 52 1.56 0.00 -1.29 -2.18 0.03 0.00 -0.95 -1.98
21 53 1.69 0.00 -1.26 -2.22 0.11 0.00 -0.95 -2.01
22 54 1.73 0.00 -1.13 -2.05 0.11 0.00 -0.85 -1.79
23 55 1.68 0.00 -0.92 -1.68 0.04 0.00 -0.67 -1.37
24 56 1.54 0.00 -0.65 -1.18 -0.08 0.00 -0.43 -0.79
25 57 1.34 0.00 -0.37 -0.62 -0.24 0.00 -0.16 -0.14
26 58 1.11 0.00 -0.12 -0.08 -0.39 0.00 0.09 0.48
27 59 0.89 0.00 0.07 0.37 -0.51 0.00 0.31 0.98
28 60 0.72 0.00 0.19 0.67 -0.58 0.00 0.45 1.29
29 61 0.62 0.00 0.21 0.78 -0.57 0.00 0.50 1.37
30 62 0.61 0.00 0.14 0.68 -0.48 0.00 0.46 1.21
31 63 0.68 0.00 0.00 0.39 -0.31 0.00 0.33 0.83
32 0 0.84 0.00 -0.21 -0.05 -0.09 0.00 0.12 0.28
33 1 1.04 0.00 -0.44 -0.58 0.16 0.00 -0.12 -0.36
34 2 1.27 0.00 -0.66 -1.11 0.42 0.00 -0.37 -0.99
35 3 1.49 0.00 -0.85 -1.58 0.64 0.00 -0.59 -1.53
36 4 1.66 0.00 -0.97 -1.92 0.81 0.00 -0.75 -1.91
37 5 1.76 0.00 -1.02 -2.06 0.90 0.00 -0.82 -2.06
38 6 1.76 0.00 -0.97 -2.00 0.91 0.00 -0.80 -1.98
39 7 1.68 0.00 -0.85 -1.74 0.84 0.00 -0.68 -1.67
40 8 1.52 0.00 -0.66 -1.30 0.71 0.00 -0.49 -1.17
41 9 1.30 0.00 -0.44 -0.76 0.53 0.00 -0.24 -0.56
42 10 1.07 0.00 -0.21 -0.19 0.33 0.00 0.03 0.07
43 11 0.84 0.00 0.00 0.31 0.13 0.00 0.28 0.63
44 12 0.67 0.00 0.15 0.67 -0.03 0.00 0.47 1.03
45 13 0.57 0.00 0.23 0.82 -0.13 0.00 0.57 1.22
46 14 0.57 0.00 0.22 0.73 -0.18 0.00 0.57 1.16
47 15 0.66 0.00 0.13 0.41 -0.15 0.00 0.46 0.86
48 16 0.83 0.00 -0.03 -0.10 -0.06 0.00 0.26 0.36
49 17 1.06 0.00 -0.22 -0.72 0.09 0.00 0.00 -0.26
50 18 1.31 0.00 -0.41 -1.33 0.27 0.00 -0.29 -0.90
51 19 1.55 0.00 -0.57 -1.84 0.48 0.00 -0.55 -1.46
52 20 1.73 0.00 -0.66 -2.14 0.69 0.00 -0.74 -1.85
53 21 1.83 0.00 -0.67 -2.18 0.88 0.00 -0.82 -2.01
54 22 1.85 0.00 -0.58 -1.95 1.01 0.00 -0.78 -1.89
55 23 1.77 0.00 -0.43 -1.51 1.07 0.00 -0.62 -1.53
56 24 1.61 0.00 -0.23 -0.95 1.02 0.00 -0.35 -0.97
57 25 1.39 0.00 -0.03 -0.39 0.86 0.00 -0.03 -0.32
58 26 1.13 0.00 0.14 0.06 0.62 0.00 0.29 0.33
59 27 0.85 0.00 0.25 0.36 0.30 0.00 0.55 0.86
60 28 0.56 0.00 0.32 0.59 0.10 0.00 0.69 1.17
61 29 0.32 0.00 0.37 0.71 -0.11 0.00 0.68 1.20
62 30 0.15 0.00 0.40 0.66 -0.18 0.00 0.57 0.98
63 31 0.15 0.00 0.31 0.27 -0.12 0.00 0.45 0.66