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

System Test With Static Object

The test involves detecting an object at approximately 1m from the sensor. Both captures with LDO and LC filter schemes are shown below. No major degradation in the signal power is detected as shown below.

GUID-09913243-C72C-4F5A-B321-19FBACE06440-low.gifFigure 4-2 Capture With LDO Scheme, RX Gain-48dB
GUID-849D67E5-EE47-4D72-8074-2D3932A75AB7-low.gifFigure 4-3 Capture With LDO Scheme, RX Gain-30dB
GUID-F81F6E03-2090-405C-A3E3-FB5C0784F72E-low.gifFigure 4-4 Capture With LC Filter Scheme, RX Gain-48dB
GUID-E067698C-2130-4259-A3EB-4E1EF9E9DC35-low.gifFigure 4-5 Capture With LC Filter Scheme, RX Gain-30dB
Table 4-6 SNR Comparison Between LDO and LC Filter Scheme for RX Gain = 30 and 48
PM SchemeRX Gain(dB)SNR(dB)-RBW 152.6Hz
LDO3081.93
4883.9
LC Filter3079.6
4881.9