A 90.9 dB SNDR 95.3 dB DR Audio Delta–Sigma Modulator with FIA-Assisted OTA

Author:

Huang Gongxing1,Wei Cong1,Wei Rongshan1ORCID

Affiliation:

1. College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China

Abstract

This paper presents a low-power, high-gain integrator design that uses a cascode operational transconductance amplifier (OTA) with floating inverter–amplifier (FIA) assistance. Compared to a traditional cascode, the proposed integrator can achieve a gain of 80 dB, while reducing power consumption by 30%. Upon completing the analysis, the value of the FIA drive capacitor and clock scheme for the FIA-assisted OTA were obtained. To enhance the dynamic range (DR) and mitigate quantization noise, a tri-level quantizer was employed. The design of the feedback digital-to-analog converter (DAC) was simplified, as it does not use additional mismatch shaping techniques. A third-order, discrete-time delta–sigma modulator was designed and fabricated in a 0.18 μm complementary metal-oxide semiconductor (CMOS) process. It operated on a 1.8 V supply, consuming 221 µW with a 24 kHz bandwidth. The measured SNDR and DR were 90.9 dB and 95.3 dB, respectively.

Publisher

MDPI AG

Reference28 articles.

1. Berti, C.D., Malcovati, P., Crespi, L., and Baschirotto, A. (2015, January 14–18). A 106.7-dB DR, 390-μW CT 3rd-order ΣΔ modulator for MEMS microphones. In Proceedings of the ESSCIRC Conference 2015—41st European Solid-State Circuits Conference (ESSCIRC), Graz, Austria.

2. Analysis and Design of a High Speed Continuous-time ΔΣ Modulator Using the Assisted Opamp Technique;Jain;EEE J. Solid-State Circuits,2012

3. Incremental Delta-Sigma ADCs: A Tutorial Review;Tan;IEEE Trans. Circuits Syst. I Regul. Pap.,2020

4. A 6 μ W 95 dB SNDR Inverter Based ΣΔ Modulator with Subtractive Dithering and SAR Quantizer;Zhang;IEEE Trans. Circuits Syst. II Express Briefs,2019

5. Slewing Mitigation Technique for Switched Capacitor Circuits;Kareppagoudr;IEEE Trans. Circuits Syst. I Regul. Pap.,2020

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