TIDUFD9 August   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Half-Bridge Topology
      2. 2.2.2 Power Dissipation Design Consideration
      3. 2.2.3 HPA Drain Capacitor Bank Design
      4. 2.2.4 Gate and Drain Pulsing Considerations
      5. 2.2.5 Additional Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 AFE20408
      2. 2.3.2 LMG2100R026
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
      1. 3.3.1 Initial Hardware Setup
      2. 3.3.2 Install HPA
    4. 3.4 Test Results
      1. 3.4.1 Bias Up and Down the HPA
      2. 3.4.2 HPA Drain Modulation
      3. 3.4.3 HPA Gate Modulation
  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

3.4.1 Bias Up and Down the HPA

To bias up the QPA1014 HPA on header J22, perform the following:

  • Launch the TIDA-010289 GUI
  • Go to the Manual Operation tab in the GUI
  • Change the values set by the DACA2 field from to –10V to –6V
  • Click on DRVEN0 Low button in the GUI to trigger the voltage change. Now the button reads DRVEN0 High.
  • 28V can be applied manually by turning on the 28V power supply.
  • Change the DACB0 field from –6V to around –2.7V until current reads 450mA on the power supply or measured using SENSE0 field. Be careful to ramp up slowly to avoid damaging the HPA.

To bias down the HPA, perform the bias down procedure in reverse. The same procedure can be followed for J24, J26 and J28 by modifying the DACA3, DACA1 and DACA0, respectively.

Figure 3-2 shows the results of the HPA bias up and bias down procedure by manually setting a drain voltage through a power supply.


TIDA-010289 Bias Up and Down the HPA

Figure 3-2 Bias Up and Down the HPA

To perform the biasing sequence using header J29, connect position 2 of J4–J6 and J10 to a MSPM0 or FT4232 SPI instead of the onboard FT4222 SPI and perform the following:

  • Launch the TIDA-010289 GUI
  • Set power supply voltage on J11 to the pinch-off voltage of the device (for example, –6V for the QPA1014)
  • In the GUI, go to the HPA Bias Operation tab
  • Select the end voltage to be around –2.7V
  • Set DRIVEN length field (where units are in µs) up to 1200
  • Click on the Start Sequence button

The same procedure can be followed for J23, J25 and J27 by modifying the DACB2, DACB3 and DACB1, respectively.

Figure 3-3 shows the results of the HPA bias up and bias down procedure leveraging a LMG2100R026 to bias up and down the HPA using a DRIVEN pulse of 1.2ms.


TIDA-010289 Bias Up and Bias Down HPA Sequence

Figure 3-3 Bias Up and Bias Down HPA Sequence