1. Fully passive third‐order noise shaping SAR ADC
- Author
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Pedram Payandehnia, Hossein Mirzaie, Hamidreza Maghami, Gabor C. Temes, and J. Muhlestein
- Subjects
Comparator ,Computer science ,020208 electrical & electronic engineering ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,020206 networking & telecommunications ,Successive approximation ADC ,Topology (electrical circuits) ,Hardware_PERFORMANCEANDRELIABILITY ,02 engineering and technology ,Noise (electronics) ,Noise shaping ,Third order ,Hardware_INTEGRATEDCIRCUITS ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electrical and Electronic Engineering ,Electronic filter - Abstract
In this Letter, an opamp-free noise shaping successive-approximation register (SAR) ADC is proposed. Third-order noise shaping is achieved by implementing a second-order passive filter and a passive error feedback topology. In the proposed scheme, the SAR error signals (including quantisation noise, comparator thermal noise, DAC thermal noise and settling error) are subjected to third-order noise shaping. Therefore, the thermal noise specifications of the comparator can be relaxed. Also, since no active element is used, the proposed scheme achieves a higher power efficiency than earlier SAR ADCs.
- Published
- 2017
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