Low voltage 2-path SC bandpass ΔΣ modulator without bootstrapper

Author

Wang, Lei ; Embabi, S.H.K.

Author_Institution

Maxim Integrated Products Boston Design Center, Chelmsford, MA, USA

Volume

1

fYear

2003

fDate

25-28 May 2003

Abstract

A 1.5V fully differential, 2-path fourth order switched capacitor bandpass Δ-Σ modulator was designed and fabricated in 1.2μm CMOS without using any on-chip voltage multiplier. The effective clock frequency is 10 MHz. The Basic building blocks of the modulator are auto-zeroed differentiators. The signal bandwidth is 50kHz centered at the intermediate frequency of 2.5MHz. Tested results demonstrated that SNR=65dB for the full-scale input of 1.1V_p. IM3=-75dB. The common mode input voltage is from rail to rail.

Keywords

CMOS integrated circuits; band-pass filters; differentiating circuits; sigma-delta modulation; switched capacitor networks; 1.1 V; 1.2 micron; 1.5 V; 10 MHz; 2.5 MHz; 50 kHz; CMOS; SC bandpass ΔΣ modulator; auto-zeroed differentiators; common mode input voltage; effective clock frequency; full-scale input; intermediate frequency; signal bandwidth; switched capacitor modulator; Artificial intelligence; Bandwidth; Capacitors; Circuit noise; Delay; Delta modulation; Low voltage; Signal to noise ratio; Switches; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on

Print_ISBN

0-7803-7761-3

Type

conf

DOI

10.1109/ISCAS.2003.1205718

Filename

1205718