Find info on the basics of successive-approximation-register (SAR) analog-to-digital converters (ADCs). Review SAR ADC with pipeline, flash, and sigma-delta ADCs.

What is the ADC actually converting? How does the ADC control happen? How Does a SAR ADC Work? Digital filter architecture determines overall ADC response. Stabilizes op amp by isolating it from the capacitive load. In addition, the RC network slows the load transient seen by the op amp and provides noise and anti-aliasing filtering.

In following videos we will revisit this simplified view of the SAR ADC and use it to help with input drive and voltage reference drive topics. This figure compares the SAR conversion method on the left to the delta-sigma conversion method on the right.

The SAR ADC architecture is elegant, efficient, easy to understand, and ideally suited to modern fine-line CMOS processes. The lack of "pipeline" delay (or latency) makes it ideal for single-shot and multiplexed data acquisition applications.

This paper will explain how the SAR ADC operates by using a binary search algorithm to converge on the input signal. It also explains the heart of the SAR ADC, the capacitive DAC, and the high-speed comparator. Finally, the article will contrast the SAR architecture with pipeline, flash, and sigma-delta ADCs.

Jan 1, 2016 · Successive approximation register analog-to-digital converters, better known as SAR ADCs, are a versatile class of analog-to-digital converters that produce a digital (discrete time) representation of a continuous analog waveform.

The most popular and versatile Analog-to-Digital Converter (ADC) has a Successive Approximation Register (SAR) topology. These converters work by comparing an analog voltage signal to known fractions of the full-scale input voltage and then setting or clearing bits in the ADC’s data register.

SAR ADC摒弃了pipeline ADC中的高能耗运放，采用了更为简洁的架构，只包含比较器和CDAC，如 图1 所示。 这种设计不仅面积小，而且与数字化应用完美契合，特别适合用于先进的 CMOS技术。 同步SAR ADC存在两个效率问题：首先，1bit/cycle导致整体转换速度受限，迫使比较器的时钟频率必须远高于输入采样频率；其次，比较器可能在完成锁存后，仍需等待下一个时钟周期才能继续工作，这期间的时间没有得到有效利用。 异步SAR ADC架构巧妙地解决了同 …

Aug 20, 2024 · "An Overview of Noise-Shaping SAR ADC: From Fundamentals to the Frontier," in IEEE Open Journal of the Solid-State Circuits Society, vol. 1, pp. 149-161, 2021 [pdf]

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