A 15 BIT THIRD ORDER POWER OPTIMIZED CONTINUOUS TIME SIGMA DELTA MODULATOR FOR AUDIO APPLICATIONS

Soumya Shatakshi Panda

Abstract: Analog to Digital converters find a lot of usage in various receiver design architectures. Analog modules are found to be precise and quite resistant to various sources of noise and interference. Most of the highly accurate A/D converters involve the use of sigma-delta modulation which is associated with oversampling and noise shaping. The converters which make use of this modulation technique, find a high usage in applications which have the ability to tolerate offset and gain errors.The design of a 15 bit third order power optimized continuous time ?-? modulator has been presented in this paper. This modulator operates with 1.8 V supply and has been implemented using cadence 180nm technology. In this paper, the individual blocks of the modulator have been designed. Instead of the conventional comparator, a clamped push pull type comparator has been used which can drive large capacitive loads

Keywords: A to D converter, Clamped push-pull comparator, Noise shaping, Offset error, Oversampling, Sigma Delta modulation

DOI: https://doi.org/10.15623/ijret.2014.0327019