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Precision ADC Evaluation Using a Low Noise DC Source

应用文章

As the operating voltages of analog-to-digital converters (ADCs) continue to decrease, the voltage step associated with the least significant bit (LSB) also decreases. If the voltage step of the LSB becomes smaller than the ADC’s equivalent input noise, then a stable and low-noise test signal is essential for precise ADC evaluation. In these situations, a conventional DC power supply cannot be used to evaluate precision ADCs because its noise level is too high compared to the LSB step size. A solution for making these types of measurements is to use a dual-channel low noise power source, such as the Keysight Tecnologies, Inc. B2961A or B2962A 6.5 digit low noise power source.

This application note outlines the importance of, and the requirements for, low-noise DC signal sources for ADC evaluation, and explains why the Keysight B2961A/62A is the well-suited for this application.

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