Alias Rejection in CT Delta-Sigma ADCs Using Virtual-Ground-Switched Resistor Feedback

Autor:	Shanthi Pavan, Raviteja Theertham
Rok vydání:	2022
Předmět:	Alias law Computer science Virtual ground Electronic engineering Resistive feedback Electrical and Electronic Engineering Resistor Delta-sigma modulation Cmos process law.invention Degradation (telecommunications)
Zdroj:	IEEE Transactions on Circuits and Systems II: Express Briefs. 69:1991-1995
ISSN:	1558-3791 1549-7747
Popis:	High-resolution continuous-time delta-sigma modulators use resistive feedback DACs for low-noise operation. Such DACs have conventionally been switched at the reference end. It turns out that reference-path resistance degrades the performance of these DACs. This problem can be addressed by the virtual-ground-switched resistor DAC. However, moving the switches to the virtual-ground-side degrades alias-rejection of the modulator. This brief analyzes the mechanism of degradation and develops a model to estimate alias rejection. Our theory is supported by simulations and measurements from a prototype modulator designed in a 180 nm CMOS process. We then describe a way to address this problem, and demonstrate its efficacy using layout-extracted simulations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8baa9d19d144a8c06d7e8fd4f2a3e5da https://doi.org/10.1109/tcsii.2021.3089914 Zobrazit plný text záznamu