SWRA577A October   2017  – November 2020 AWR1243 , AWR1443 , AWR1642 , AWR1843 , AWR1843AOP , AWR2243 , AWR6843 , IWR1443 , IWR1642 , IWR1843 , IWR6443 , IWR6843 , IWR6843AOP , LP87524B-Q1 , LP87524J-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Power Supply Ripple and Noise Specifications
  4. 3Reference Solution
  5. 4Low Cost LC Filter Solution
    1. 4.1 LDO vs LC Filter Scheme Comparison
      1. 4.1.1 Waveguide Loopback Tests
      2. 4.1.2 Spur/Noise Floor Level
      3. 4.1.3 Voltage Transient Behavior
    2. 4.2 System Tests
      1. 4.2.1 Sensor Configuration
      2. 4.2.2 System Test With Static Object
      3. 4.2.3 Spur/Noise Floor Level
  6. 5Summary

Power Supply Ripple and Noise Specifications

Out of the four Power supply rails mentioned above, the 1.0 V and the 1.8 V supplies are sensitive to the supply ripple and noise because these supplies feed the critical blocks in the device like PLL, baseband ADC, synthesizer, and so forth. For more details on the power supply rail and the logic that it feeds in the device, see the device-specific data sheet. Table 2-1 and Table 2-2 provide the ripple and noise spec for 1.0 V

Table 2-1 XWR1xx Supply Ripple (µVrms)
Sl. Number Frequency (KHz) XWR1xx Supply Ripple (µVrms)
1 17.1875
2 34.375
3 68.75
4 137.5
5 275
6 550
7 1100
8 2200
9 4400 35.48133892
10 6600
Table 2-2 XWR1xx Noise Spectral Density (µVrms/RtHz)
Sl. Number Frequency (KHz) XWR1xx Noise Spectral Density (µVrms/RtHz)
1 17.1875 0.01
2 34.375 0.01
3 68.75 0.01
4 137.5 0.015
5 275 0.02
6 550 0.02
7 1100 0.009
8 2200 0.002
9 4400 0.05
10 6600 0.002

Table 2-3 and Table 2-4 provide the ripple and noise spec for 1.8 V.

Table 2-3 XWR1xxx Supply Ripple (µVrms)
Sl Number Frequency (KHz) XWR1xxx Supply Ripple (µVrms)
1 17.1875
2 34.375
3 68.75
4 137.5
5 275
6 550
7 1100
8 2200
9 4400 35.48133892
10 6600
Table 2-4 XWR1xxx Noise Spectral Density (µVrms/RtHz)
Sl Number Frequency (KHz) XWR1xxx Noise Spectral Density (µVrms/RtHz)
1 17.1875 0.08
2 34.375 0.07
3 68.75 0.07
4 137.5 0.07
5 275 0.07
6 550 0.07
7 1100 0.07
8 2200 0.07
9 4400 0.07
10 6600 0.07