AC and DC Data Acquisition Signal Chains Made Easy
Sampling phenomena in analog-to-digital converters (ADCs) induce the problems of aliasing and capacitive kickback. To solve these problems, designers use filters and driving amplifiers that introduce their own sets of challenges. This makes achieving precision DC and AC performance in medium bandwidth application areas a challenge, and designers end up trading off system goals to do so.
This article describes continuous-time sigma-delta (∑-Δ) ADCs that solve these sampling problems by simplifying signal chains. They remove the need for antialiasing filters and buffers, and they solve signal chain offset errors and drift issues associated with the additional components. These benefits shrink the solution size, ease solution design, and improve the phase matching and overall latency of the system.
In this whitepaper from Analog Devices, discover a comparison with discrete-time converters that highlights system benefits, as well as the constraints of using continuous-time sigma-delta ADCs.