TIDUF70 April   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 DAC39RF10-SEP
      2. 2.3.2 ADC12DJ5200-SEP
      3. 2.3.3 LMK04832-SEP
      4. 2.3.4 LMX2694-SEP
      5. 2.3.5 TPS7H4010-SEP
      6. 2.3.6 TPS7H1111
      7. 2.3.7 TPS7H1212-SEP
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
    4. 3.4 Test Procedure
    5. 3.5 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.5 Test Results

The test signal is a wideband OFDM (Orthogoanl Frequency Divistion Multiplexed) modulated signal operating at a 5GSPS data rate. The patterns are configured with a 2GHz and 4GHz signal bandwidth. Figure 3-2 and Figure 3-3 show the spectrum performance out of the transmitter.

GUID-20240406-SS0I-46JJ-TLG0-3P8RJTKTMJ2P-low.png Figure 3-2 DAC Output With 2GHz Wide OFDM Signal
GUID-20240406-SS0I-BQHW-VVK5-4FKTMQBHKHNR-low.png Figure 3-3 DAC Output with 4GHz Wide OFDM Signal

The modulated output signal is looped back to the transmitter through a 20dB attenuator to maintain that the receiver is not over-driven. Figure 3-4 and Figure 3-5 show the FFT spectrum of the captured waveform from the receiver.

GUID-20240406-SS0I-3TLC-C4RH-14ZSLDNNCN0D-low.jpg Figure 3-4 ADC Capture of 2GHz Wide OFDM Signal (Loopback)
GUID-20240406-SS0I-JWT3-DLHG-PMPRSGSKSD0H-low.jpg Figure 3-5 ADC Capture of 4GHz Wide OFDM Signal (Loopback)