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Continuous-Time Delta-Sigma Modulators Based on Passive RC Integrators.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Nov2018, Vol. 65 Issue 11, p3662-3674. 13p. - Publication Year :
- 2018
-
Abstract
- Due to the emerging systems with constraints in terms of power and costs, such as smart sensor interfaces for the Internet-of-Things, the design of the ADCs becomes very challenging. In this paper, energy and area efficient techniques for continuous-time (CT) delta-sigma modulators ($\Delta \Sigma $ Ms) are discussed. These techniques are based on increasing the contribution of the 1-bit comparator to the loop gain by using passive RC integrators together with low gain amplifiers in the $\Delta \Sigma \text{M}$ loop filter. A third-order CT $\Delta \Sigma \text{M}$ is designed using these techniques to demonstrate their validity, and it achieves 27.5 fJ/conv.-step of energy efficiency. Due to the many design issues, such as the tradeoff between RC variations and loop stability, the design of this modulator has been optimized using a genetic algorithm. The 65-nm CMOS $\Delta \Sigma \text{M}$ occupies only $0.013~\mathrm {mm^{2}}$ , dissipates 256 $\mu \text{W}$ from a 0.7-V supply and it achieves a peak SNDR of 69.1 dB in a 2-MHz bandwidth. The dynamic range reaches 76.2 dB, which corresponds to a $\mathrm {FoM_{Schreier}}$ of 175.1 dB. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CONTINUOUS-time filters
*INTEGRATORS
*ELECTRIC resistors
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 65
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 132209235
- Full Text :
- https://doi.org/10.1109/TCSI.2018.2855649