SBAA635 July   2024 AFE7900 , AFE7901 , AFE7903 , AFE7950 , AFE7950-SP , AFE7951 , AFE7953 , AFE7954 , AFE7955 , AFE7958

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2AFE79XX TX Architecture
  6. 3Numerically Controlled Oscillator
  7. 4Configuring the AFE79XX for Multi-Band Jamming
    1. 4.1 Overview of Configurability
    2. 4.2 Jamming Related Latte Functions and Parameters
    3. 4.3 Results
  8. 5Summary
  9. 6References

3 Numerically Controlled Oscillator

The complex digital mixers in the AFE79XX DDC and DUC include digital quadrature modulator (DQM) blocks with independent Numerically Controlled Oscillator (NCO) or NCOs. The NCOs convert the complex input signal to a real output signal with flexible frequency placement between 0 and fDAC / 2, where fDAC is the DAC sampling clock frequency. The NCOs have a 32-bit frequency accumulator value that generates the sine and cosine terms for the complex mixing. Figure 3-1 shows the NCO block diagram.

NCO Block Diagram Figure 3-1 NCO Block Diagram