Title :
A 2-GHz analog-to-digital delta-sigma modulator for CDMA receivers with 79-dB signal-to-noise ratio in 1.23-MHz bandwidth
Author :
Dagher, Elias H. ; Stubberud, Peter A. ; Masenten, Wesley K. ; Conta, Matteo ; Dinh, Thang Victor
Author_Institution :
Ditrans Corp., Irvine, CA, USA
Abstract :
This paper presents the design of a second-order single-bit analog-to-digital continuous-time delta-sigma modulator (CT-ΔΣM) that can be used in wireless CDMA receivers. The CT-ΔΣM samples at 2 GHz, consumes 18 mW at 1.8 V and has a 79-dB signal-to-noise ratio (SNR) over a 1.23-MHz bandwidth. The CT-ΔΣM was fabricated in a 0.18-μm 1-poly 6-metal, CMOS technology and has an active area of approximately 0.892 mm2. The ΔΣM´s critical performance specifications are derived from the CDMA receiver specifications.
Keywords :
CMOS digital integrated circuits; UHF integrated circuits; analogue-digital conversion; code division multiple access; delta-sigma modulation; high-speed integrated circuits; integrated circuit design; radio receivers; 0.18 micron; 1.23 MHz; 1.8 V; 18 mW; 2 GHz; CMOS technology; analog-to-digital delta-sigma modulator; code division multiple access; continuous-time delta-sigma modulation; high-speed integrated circuit; wireless CDMA receivers; Bandwidth; Circuits; Delta modulation; Digital communication; Digital filters; Dynamic range; Filtering; Multiaccess communication; Receivers; Signal to noise ratio; Analog–digital conversion; CDMA; CMOS; code division multiple access; continuous-time delta-sigma modulation; high-speed integrated circuit;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2004.835831
