A novel design of two-stage CMOS amplifier used for εΔ analog to digital converter

Author

Laajimi, Radwene ; Gueddah, Nawfil ; Masmoudi, Mohamed

Author_Institution

Dept. of Electr. Eng., Micro-Technol. & Commun. (EMC) Res. Group, Sfax, Tunisia

fYear

2012

fDate

16-18 May 2012

Firstpage

1

Lastpage

6

Abstract

Operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated discret-time filters used in analog to digital converter (ADC) for Sigma-delta converter. In this paper we designed a novel structure of two-stage CMOS amplifier in AMS 0.35μm technology. Simulation results confirm the proposed OTA circuit. In fact, we achieved a gain band width (GBW) equal to 80MHz, Cut-off frequency (f_b) of 95 KHz and 60 dB gain (A_v). In addition our new circuit allowed us to reduce settling time (S_t) to 30 ns and a slew rate (SR) of 50 ν/μs at ±1.5V supply voltage. Eventually we have also succeeded in reducing the static power consumption to 0.36 mW.

Keywords

CMOS analogue integrated circuits; discrete time filters; low-power electronics; operational amplifiers; sigma-delta modulation; εΔ analog to digital converter; AMS technology; bandwidth 80 MHz; cut-off frequency; frequency 95 kHz; gain 60 dB; gain bandwidth; integrated discret-time filter; operational transconductance amplifier; power 0.36 mW; sigma-delta converter; size 0.35 mum; static power consumption reduction; time 30 ns; two-stage CMOS amplifier design; Conferences; Nanoscale devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Design & Technology of Integrated Systems in Nanoscale Era (DTIS), 2012 7th International Conference on

Conference_Location

Gammarth

Print_ISBN

978-1-4673-1926-3

Type

conf

DOI

10.1109/DTIS.2012.6232946

Filename

6232946