"A 2G/3G Cellular Analog Baseband Based on a Filtering ADC"

A current-driven low-pass filter embedded in a sigma- delta analog-to-digital converter is presented. The implementation of a class-B feedback digital-to-analog converter, together with in-band noise reduction and passive filtering, gives the possibility to handle challenging wireless communication scenarios with low power consumption. The architecture is a suitable candidate to implement the entire baseband analog section of a Global System for Mobile Communications–Universal Mobile Telecommunications System (GSM–UMTS) reconfigurable receiver