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Low-Pass Filtering SC-DAC for Reduced Jitter and Slewing Requirements on CTSDMs.
- Source :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers; Apr2019, Vol. 66 Issue 4, p1369-1381, 13p
- Publication Year :
- 2019
-
Abstract
- In this paper, a technique is introduced that improves the performance of one-bit continuous-time sigma delta modulators (CTSDMs) using a low-pass filtering switched capacitor digital to analog converter (LPSC-DAC). This DAC effectively combines an infinite impulse response filter with a switched capacitor resistor DAC (SCR-DAC). The resulting DAC is inherently immune toward inter-symbol interference. Moreover, by filtering the feedback signal in the discrete-time domain, the jitter robustness of the modulator is greatly improved and most importantly the slewing requirements on the OpAmps in the modulator’s loop filter are greatly relaxed up to a level that the OpAmps can be scaled down toward their ultimate noise limited power level. Furthermore, this LPSC-DAC does not suffer from the SCR-DAC’s disadvantageous trade-off between the modulator’s jitter, slewing, and anti-aliasing performance. We also show how to compensate for the extra pole of the LPSC-DAC, such that the CTSDM’s loop filter, noise- and signal-transfer function remains unchanged. As a result, this technique is completely transparent to the system level designer and established system-level design techniques for sigma delta modulators remain applicable. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 66
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 135443083
- Full Text :
- https://doi.org/10.1109/TCSI.2018.2882746