Blocker Tolerant Sigma Delta ADC

Abstract

This thesis illustrates an overview of blocker tolerant analog to digital converters and shows the need of this type of modulator in the communication system and its benefit of reducing the analog receiver complexity. The new technique enables the sigma-delta analog to digital converters (SDADC) to withstand blockers at certain frequency, without saturation. The technique relies on adding a notch filter within the SDADC that affects the signal transfer function (STF) without affecting the noise transfer function (NTF). Different topologies of the blocker tolerant modulator are illustrated. A new approach is studied in the discrete time which is characterized by its filtering property of the blocker at specific frequency, then implemented in the continuous time.