Continuous GPS tracking devices always suffer short battery life when used by caregivers to reduce the risk of wandering to dangerous areas by dementia patients. Currently the best existing tracker ...

A quad-band GSM/GPRS/EDGE receiver front-end including I and Q ADCs designed in 90nm digital CMOS technology is presented. The low band receiver designed for GSM850/GSM900 achieves 33dB gain, 1.9dB ...