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Don Tuite
January 12, 2006
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Still the architecture of choice for "near-dc" sampling and greater than 20-bit resolution, delta-sigmas built using fine-geometry process technologies are moving in on the pipeline ADC's turf.
Companies are innovating with other architectures, too. The folding/ interpolating architecture made a comeback in 2005, and other types of paralleled interleaving pipelines and SARs are in the works.
The preferred process geometry for pipelines and SARs is 0.25μm, but the new delta-sigmas are exploiting finer geometries to squeeze die size and power in post-conversion digital filtering.
Techniques borrowed from high-speed serial-IO are successfully attacking clock jitter.
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