"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.