A 134-μW 99.4-dB SNDR Audio Continuous-Time Delta-Sigma Modulator With Chopped Negative-R and Tri-Level FIR-DAC
| Autor: | Moon-Hyung Jang, Changuk Lee, Youngcheol Chae |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Spurious-free dynamic range Dynamic range business.industry 020208 electrical & electronic engineering Electrical engineering 02 engineering and technology Delta-sigma modulation Noise (electronics) law.invention CMOS law Integrator Virtual ground 0202 electrical engineering electronic engineering information engineering Operational amplifier Electrical and Electronic Engineering business |
| Zdroj: | IEEE Journal of Solid-State Circuits. 56:1761-1771 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | This article presents a low-power audio continuous-time delta-sigma modulator (CTDSM) that employs a chopped negative-R and a tri-level finite impulse-response (FIR) DAC. The noise of the first opamp is mitigated by using a negative-R at the virtual ground of the first integrator, and the negative-R is then chopped to remove the intrinsic ${1/f}$ noise of the negative-R. The highly linear feedback DAC is realized with a 6-tap tri-level FIR-DAC whose inter-symbol interference (ISI) is kept less than −120 dB. The CTDSM fabricated in 65-nm CMOS technology occupies an active area of 0.28 mm2. It achieves 99.4-dB SNDR, 101-dB SNR, 102.8-dB dynamic range (DR), and 110.2-dB SFDR in a 24-kHz bandwidth, while consuming only $134~\mu \text{W}$ . This corresponds to a state-of-the-art figure-of-merit (FoM) of 185.3 dB. |
| Databáze: | OpenAIRE |
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