Type of Document	Dissertation
Author	Altun, Oguz
Author's Email Address	oguz_altun@yahoo.com
URN	etd-04012005-104833
Title	A 1.5V Multirate Multibit Sigma Delta Modulator for GSM/WCDMA in a 90nm Digital CMOS Process
Degree	Doctor of Philosophy
Department	Electrical and Computer Engineering
Advisory Committee	Advisor Name Title Allen, Phillip E. Committee Chair Ayazi, Farrokh Committee Member Laskar, Joy Committee Member Leach, Marshall W. Committee Member Morley, Tom Committee Member
Keywords	low power mixed signal low voltage sigma delta modulators
Date of Defense	2005-03-17
Availability	unrestricted
Abstract A dual-mode second-order Multirate Multibit Sigma Delta (MM-SD) modulator is implemented in a 90nm digital 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 a 1.5V supply. This dual-mode design also achieves 42.8dB SNDR in the 1.94 MHz WCDMA band with only 1.9mA of total current consumption.
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