A 1.5V Multirate Multibit Sigma Delta Modulator for GSM/WCDMA in a 90nm Digital CMOS Process

Low-power;Mixed-signal;Low voltage;Sigma delta modulators

Altun, Oguz ; Electrical and Computer Engineering

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: Low-power;    Mixed-signal;    Low voltage;    Sigma delta modulators;   

Others  :  https://smartech.gatech.edu/bitstream/1853/7104/1/altun_oguz_200508_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

A dual-mode second-order Multirate Multibit Sigma Delta (MM-SD) modulator is implemented in a 90nmdigital CMOS process for application in the baseband path of RF receivers. Low power consumption is achieved through a new integrator structure and a dedicated timing scheme along with aggressive capacitor scaling in the second stage of the modulator loop. Fabricated prototype achieves 68.6dB peak Signal-to-Noise and Distortion ratio (SNDR) in the 200 kHz GSM band and requires 1.1mA of total current from a1.5V supply. This dual-mode design also achieves 42.8dB SNDR in the 1.94 MHz WCDMA band with only1.9mA of total current consumption.