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- Title
Behavioral and Electrical Modeling of a 0.5-V Third-Order Continuous-Time Sigma-Delta Modulator with FIR DAC for Audio Applications.
- Authors
Cortez, Matheus; Girardi, Alessandro G.; Compassi Severo, Lucas; de Aguirre, Paulo César C.
- Abstract
Most mobile and wearable devices present digital audio signal processing capabilities. Since the nature of audio signals is analog, there is a need to use analog-to-digital converters (ADCs) with high-resolution for a high signal-tonoise ratio audio acquisition. This paper presents the highlevel modeling and design of a continuous-time third-order sigma-delta modulator (CT-SDM) with an FIR DAC for audio devices, using a supply voltage of 0.5 V. The design is divided in three steps and is carried out using the Delta-sigma toolbox and a discrete-time to continuous-time (DT-CT) transformation. First, the schematic implementation with verilogA models is done to estimate the first-integrator amplifier specifications for the modulator to provide 14 bits of ENOB. Following, a two-stage inverter-based amplifier is designed and used to verify the design strategy. Finally, a transistor-level implementation of OTAs and comparator is done to evaluate the CTSDM performance. An in-depth analysis and discussion are presented to explain the achieved results with those transistorlevel circuits.
- Subjects
ELECTRONIC modulators; DIGITAL-to-analog converters; DIGITAL signal processing; PROCESS capability; ANALOG-to-digital converters; FIR; DIGITAL technology
- Publication
Journal of Integrated Circuits & Systems, 2023, Vol 18, Issue 1, p1
- ISSN
1807-1953
- Publication type
Article
- DOI
10.29292/jics.v18i1.664