Analog-to-Digital Converter Design and Performance Optimization

Analog-to-digital converters (ADCs) transcribe continuous signals into digital form, underpinning applications from telecommunications and biomedical imaging to instrumentation. Key ADC architectures span flash, pipelined, successive approximation register (SAR), sigma–delta and time-interleaved designs, each offering distinct trade-offs between speed, resolution, power consumption and complexity. Performance is quantified by metrics such as effective number of bits (ENOB), signal-to-noise-and-distortion ratio (SNDR), spurious-free dynamic range (SFDR) and energy per conversion step (FoM). Design optimisations target noise-reduction, linearity enhancement and mismatch calibration through techniques including system-level noise-shaping, foreground and background digital calibration, advanced DAC switching schemes and comparator innovations. Recent advances leverage process scaling, digital assistance and algorithmic correction to push the boundaries of high-speed, low-power and high-accuracy conversion for emerging demands in wireless communication, sensor networks and data-acquisition systems.

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Analog-to-Digital Converter Design and Performance Optimization publication trend

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Technical terms

Successive approximation register (SAR): An ADC architecture that converts analog inputs by successive binary-weighted approximations via a capacitive DAC and comparator.
Time-interleaved ADC: A high-speed system using multiple ADC channels in parallel, each sampling in a staggered fashion to increase overall throughput.
Noise-shaping: A technique that shapes quantisation noise spectrum away from the band of interest, often using feedback loops or digital filters.
Differential nonlinearity (DNL): The deviation between actual and ideal step sizes between adjacent digital codes, affecting monotonicity and linearity.
Signal-to-noise-and-distortion ratio (SNDR): A metric combining noise and harmonic distortion levels to quantify overall converter fidelity.
Effective number of bits (ENOB): A measure of ADC resolution that accounts for noise and distortion, representing the equivalent bits of an ideal converter.
Spurious-free dynamic range (SFDR): The ratio between the amplitude of the fundamental signal and the largest spurious tone, indicating spectral purity.

References

1. A Mismatch Calibration Technique for SAR ADCs Based on Deterministic Self-Calibration and Stochastic Quantization. IEEE Transactions on Circuits and Systems I Regular Papers (2020).
2. An Overview of Noise-Shaping SAR ADC: From Fundamentals to the Frontier. IEEE Open Journal of the Solid-State Circuits Society (2021).
3. Automatic Calibration Method of Channel Mismatches for Wideband TI-ADC System. Electronics (2019).