This paper presents a low-power, high-performance continuous-time ΣΔ modulator for MEMS microphones front-end. The ΣΔ modulator 3rd-order loop filter has been implemented with a low-noise, power-optimized active-RC architecture that uses only two operational amplifiers. This solution, along with the use of a 15-level quantizer and of a feedback DAC with three-level current-steering elements, which minimizes the noise contribution for small input signals, allows achieving a DR larger than 100 dB, while consuming less than 0.5 mW, as required in always-running audio modules for portable devices. The proposed ΣΔ modulator, realized in 0.16 μm CMOS technology with an area of 0.21 mm2, achieves 106 dB A-weighted DR and 91.3 dB peak SNDR, consuming 390 μW from a 1.6 V power supply.
De Berti, C., Malcovati, P., Crespi, L., & Baschirotto, A. (2016). A 106 dB A-Weighted DR Low-Power Continuous-Time ΣΔ Modulator for MEMS Microphones. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 51(7), 1607-1618.
Citazione: | De Berti, C., Malcovati, P., Crespi, L., & Baschirotto, A. (2016). A 106 dB A-Weighted DR Low-Power Continuous-Time ΣΔ Modulator for MEMS Microphones. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 51(7), 1607-1618. |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | No |
Titolo: | A 106 dB A-Weighted DR Low-Power Continuous-Time ΣΔ Modulator for MEMS Microphones |
Autori: | De Berti, C; Malcovati, P; Crespi, L; Baschirotto, A |
Autori: | BASCHIROTTO, ANDREA (Ultimo) |
Data di pubblicazione: | 2016 |
Lingua: | English |
Rivista: | IEEE JOURNAL OF SOLID-STATE CIRCUITS |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1109/JSSC.2016.2540811 |
Appare nelle tipologie: | 01 - Articolo su rivista |