Jared Welz

A Fully Integrated Quad-Band GPRS/EDGE Radio in 0.13μm CMOS

This radio integrates all the receive and transmit functions required to support a quad-band GSM/GPRS/EDGE application into a single CMOS chip. Compared to the published work, this transceiver is implemented in low-cost digital 0.13 mum CMOS, achieves a superior receive and transmit performance, and yet has up to 2x lower receive power consumption, a key requirement in cellular applications.

Transmitter development for cellular integrated circuits

This article reviews transmitter topologies for radio transceivers with emphasis on cellular applications. In the first section it discusses different architectures and the challenges in practical implementations. Then it presents a transmitter as part of a fully integrated transceiver for GSM/GPRS/EDGE.

A 32-channel front-end for wireless HID using inverse-STF pre-filtering technique

A 32-channel front-end circuit for wireless Human Interface Devices (HID) is described. The front-end incorporates a Sigma-Delta ADC combined with an inverse-STF pre-filtering technique to achieve 10.8 ENOB at a conversion rate of 7.5µs per channel. Chopping and digital calibration are employed to achieve an offset voltage < 850µV and gain error < 0.17%. The HID front-end measures single-ended rail-to-rail inputs with 1.62V to 3.63V supply range, occupies 0.28mm2 in 65nm CMOS and consumes 1.8mW from 1.2V supply.