This paper presents a multi-standard reconfigurable
sigma-delta modulator, which is able to support the predictable
standards of fourth generation of mobile communication
systems (4G). Furthermore, the proposed architecture halves the
number of required analog-to-digital converters in parallel
receivers, by processing concurrently two different signals. The
major design issues are outlined and operation modes are
detailed. A system-level simulation is performed to demonstrate
the feasibility of the presented solution. The modulator is
implemented into switched-capacitor circuits and device level
simulations demonstrate the performance of the converter.