Return
A 109-dB SFDR Continuous-Time Delta-Sigma Modulator for Audio Using Bi-Directional Advancing Data Weighted Averaging
10.1109/TCSII.2025.3635133
2025-11-20
0
PRE
AI
Abstract
En 中文
This brief presents a high-linearity third-order 3-bit continuous-time delta-sigma modulator (CTDSM) with 109 dB spurious-free dynamic range (SFDR) for audio applications. The proposed modulator employs a cascade of integrators with feedforward structure using active RC integrators, a 3-bit flash quantizer, and resistor digital-to-analog converter (DAC) feedback. To address both DAC non-linearity and the tonal issues caused by conventional data weighted averaging (DWA), a new bi-directional advancing DWA (Bi-ADWA) with tone-suppressing and tone-transferring capabilities is introduced. Furthermore, the asymmetry in the rise/fall time of the DAC due to the additional paths introduced by Bi-ADWA is mitigated by optimizing the switch control circuitry and layout of the feedback DAC. Fabricated in a 180 nm CMOS technology, the modulator demonstrates a peak SNDR of 95.8 dB alongside a <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DR</i> of 102.5 dB, consuming 0.58 mW at 1.8 V within an active area of 0.8 mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>.
Keywords:
CMOS
audio
continuous-time
delta-sigma modulator
data weighted averaging
Journal
I
IF:
0
Papers: 153
・
Citations: 0
Researchers
A
Aoyun Sun
H-index:
0
Papers: 1
・
Citations: 0
L
Lingling Wei
H-index:
0
Papers: 1
・
Citations: 0
H
Hong Yang
H-index:
0
Papers: 1
・
Citations: 0
G
Gang Liu
H-index:
50
Papers: 266
・
Citations: 9.9K
Z
Zhang Zhang
H-index:
18
Papers: 170
・
Citations: 2.6K
Organization
H
hefei university of technology
Scholars:
2.5W
Papers: 1.7W
・
Citations: 27
S
sun yat-sen university
Scholars:
1.9W
Papers: 6.4K
・
Citations: 10
Cited Papers