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Air Force

Multi-Function Reconfigurable Delta Sigma Digital-to-Analog Converter

High speed DAC for direct-digital-to-RF synthesis, improved bandwidth, and increased maximum frequency

Communications Electronics
The US Air Force’s reconfigurable, multi-function delta sigma digital-to-analog converter enables improved bandwidth and increased maximum frequency by combining low-, band-, and high-pass capabilities to overcome traditional delta sigma device limitation
The US Air Force’s reconfigurable, multi-function delta sigma digital-to-analog converter enables improved bandwidth and increased maximum frequency by combining low-, band-, and high-pass capabilities to overcome traditional delta sigma device limitation

The US Air Force Research Laboratory’s Sensors Directorate (AFRL/RY) has developed and tested an interleaved delta sigma DAC that can synthesize frequencies from near DC (0 Hz) to near the sampling frequency (fs) by switching among low-, band-, and high-pass noise transfer functions. The technology overcomes inherent trade-offs between bandwidth and maximum output frequency without sacrificing the benefits of an all-digital architecture.

The Air Force’s technology is suited for highly integrated silicon systems-on-chip and offers considerable benefits to compound semiconductor applications, including lower part counts that reduce complexity, weight, size, and power requirements, in addition to simplifying digital adjustment and calibration. AFRL/RY’s delta sigma DAC enables the potential for multi-standard (e.g. communications and radar) devices through on-the-fly reconfiguration of power and transmission requirements.

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