Abstract

Recent efforts in the design of wireless RF transceivers focus on high integration and multi-standard operation. Higher integration can be obtained by using receiver architectures, such as wide-band IF with double conversion (WIF), that perform channel select filtering on-chip at baseband. Performing this baseband channel select filtering in the digital domain allows for the programmability necessary to adapt to the different channel bandwidths, sampling rates, and CNR requirements of multiple communication standards. At the back of a wide-dynamic range sigma-delta modulator, a decimation filter can select a desired channel in the presence of both strong adjacent channel interferers and quantization noise from the digitization process. A low-power decimation filter that performs channel select filtering for the GSM (European cellular) and DECT (European cordless) standards is presented. Automatic gain control is used within the filter to reduce the dynamic range and power consumption. Since the two standards have different blocking profiles and CNR i

Citations