A 75 MHz BW 68dB DR CT-ΣΔ modulator with single amplifier biquad filter and a broadband low-power common-gate summing technique

Author

Briseno-Vidrios, Carlos ; Edward, Alexander ; Shafik, Ayman ; Palermo, Samuel ; Silva-Martinez, Jose

Author_Institution

Analog & Mixed Signal Center, Texas A&M Univ., College Station, TX, USA

fYear

2015

fDate

17-19 June 2015

Abstract

A wide bandwidth, power efficient continuous-time ΣΔ modulator (CTΣΔM) is presented. The modulator introduces a 3^rd order filter implemented with a lossless integrator and a multiple-feedback (MFB) single-amplifier biquad (SAB) with embedded loop stability compensation. An active summing block is implemented with a common-gate amplifier followed by a transimpedance amplifier (TIA) that achieves optimum bandwidth (BW) vs power consumption tradeoff, making it suitable for over GHz operation. Fabricated in 40 nm CMOS, and clocked at 3.2 GHz, the CTΣΔM achieves a signal-to-noise and distortion ratio (SNDR) of 64.9 dB over 75 MHz BW while consuming 22.8 mW of power. The obtained Walden´s Figure of Merit (FoM) is 106 fJ/conv-step.

Keywords

CMOS digital integrated circuits; biquadratic filters; circuit feedback; compensation; continuous time systems; embedded systems; integrated circuit manufacture; low-power electronics; operational amplifiers; power consumption; sigma-delta modulation; BW DR CT-ΣΔ modulator; CMOS; FoM; MFB; SAB filter; SNDR; TIA; Walden´s figure of merit; broadband low-power common-gate summing technique; common-gate amplifier; continuous-time ΣΔ modulator; frequency 3.2 GHz; frequency 75 MHz; loop stability compensation; lossless integrator; multiple-feedback; optimum bandwidth; power 22.8 mW; power consumption; power efficiency; sigma-delta modulator; signal-to-noise and distortion ratio; single amplifier biquad filter; size 40 nm; third order filter; transimpedance amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits (VLSI Circuits), 2015 Symposium on

Conference_Location

Kyoto

Print_ISBN

978-4-86348-502-0

Type

conf

DOI

10.1109/VLSIC.2015.7231277

Filename

7231277