Open AccessDesign of Higher Order Delta Segma Modulator for ADC and CMOS Sensors
Publication year - 2019
Publication title -
international journal of innovative technology and exploring engineering
Language(s) - English
Resource type - Journals
ISSN - 2278-3075
DOI - 10.35940/ijitee.k1154.09811s19
Subject(s) - integrator , cmos , operational transconductance amplifier , delta sigma modulation , operational amplifier , electronic engineering , transconductance , amplifier , cascade , electrical engineering , computer science , engineering , voltage , transistor , chemical engineering
This paper presents a 4th-order incremental deltasigma ADC for CMOS image sensors. The ADC employing a cascade of integrators with feed forward (CIFF) architecture uses only one operational transconductance amplifier (OTA) by sharing the OTA between 1st and 2nd stages of the modulator. by using a proposed self-biasing amplifier ,which allows active signal summation at the quantizer input node without using an additional OTA, thus power and area savings are achieved. Fabricated in 90nm technology, the 4th orderdsm consumes 32.5 µW from a 1.2V supply.