A low-power 10MHz bandwidth continuous-time ΣΔ ADC with Gm-C filter

Author

Jin-Hua Hong ; Zong-Yi Chen

Author_Institution

Dept. of Electr. Eng., Nat. Univ. of Kaohsiung, Kaohsiung, Taiwan

fYear

2014

fDate

3-6 Aug. 2014

Firstpage

853

Lastpage

856

Abstract

In this paper, we design a high-speed and wide-bandwidth continuous-time sigma-delta modulator (CT-SDM). We emphasize the design of low power wide-bandwidth (10MHz) CT-SDM for WLAN Std. 802.11b receiver. In the application of wireless receiver, continuous-time sigma-delta ADC is more suitable than pipeline ADC. Instead of active-RC filter, we use Gm-C filter in our CT-SDM design because Gm-C filter consumes lower power and requires less limitation on op-amp. The CT-SDM is implemented with TSMC 0.35μm CMOS process. The proposed CT-SDM achieves a 43dB peak SNR and 48-db DR with a 10-MHz bandwidth at a 1GHz sampling rate for WLAN Std. 802.11b. The power consumption is 17.3mW with 3.3V power supply.

Keywords

CMOS integrated circuits; digital filters; low-power electronics; operational amplifiers; radio receivers; sigma-delta modulation; wireless LAN; Gm-C filter; TSMC CMOS process; WLAN Std. 802.11b receiver; bandwidth 10 MHz; continuous-time ΣΔ ADC; frequency 1 GHz; low power wide-bandwidth CT-SDM; op-amp; power 17.3 mW; sigma-delta modulator; size 0.35 mum; voltage 3.3 V; wireless receiver; Bandwidth; Modulation; Pipelines; Receivers; Sigma-delta modulation; Signal to noise ratio; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (MWSCAS), 2014 IEEE 57th International Midwest Symposium on

Conference_Location

College Station, TX

ISSN

1548-3746

Print_ISBN

978-1-4799-4134-6

Type

conf

DOI

10.1109/MWSCAS.2014.6908549

Filename

6908549