SLAAED5 june   2023 AFE11612-SEP , OPA4H199-SEP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 LDMOS and GaN Power Amplifier FET PA Basics
  5. 2 VGS Compensation
  6. 3 Sequencing
  7. 4 An Integrated PA Biasing Solution
  8. 5 Negative GaN Biasing
  9. 6 VDRAIN Switching Circuit
  10. 7 Controlled Gate Sequencing Circuit
  11. 8 VDRAIN Monitoring
  12. 9 IDQ Monitoring
  13. 10External Negative Power Supply Monitoring
  14. 11PA Temperature Monitoring
  15. 12Summary
  16. 13References

4 An Integrated PA Biasing Solution


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Figure 4-1 AFE11612-SEP Typical Application

The AFE11612-SEP is an integrated power-amplifier biasing solution that features precision Digital-to-Analog Converters (DACs) to allow for VGS control of up to twelve LDMOS PAs and supports GaN PAs with additional circuitry. The device also features robust PA monitoring and protection with programmable thresholds for two remote temperature sensors and four out of the sixteen Analog-to-Digital Converter (ADC) inputs.

Additional devices used in the application are an operational amplifier with a 40 V bipolar supply range (OPA4H199-SEP), and a current-sense instrumentation amplifier with a common mode voltage range of -4 V to 80 V (INA240-SEP).