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Low Complexity Digital Quadrature Oscillators for Variable Frequency Applications
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  • Arkadeb Sengupta ,
  • vihan shahu ,
  • Utsab Kundu ,
  • Vinod John
Arkadeb Sengupta
Kiel University

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vihan shahu
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Utsab Kundu
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Vinod John
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Switching frequency is utilized as a degree of freedom in digital control strategies for power converters. In addition to carrier-based schemes, quadrature oscillators offer an alternative method for the generation of variable frequency switching pulses. In this paper, amplitude instability in a computationally simple digital quadrature oscillator is analyzed. Algorithms for stabilizing the oscillator are developed based on this. Further implementation issues arising are addressed and a systematic comparison to carrier-based schemes is executed. It is shown that the proposed approach can be implemented with only 4 additions and 4 comparison steps without resorting to multiplication. The studies are validated in system simulation and experiments on a commercial FPGA board.