**2.1 Proposed wireless medical telemetry**

Pacemaker microsystem typically embeds a controller, electrocardiogram (ECG) sensors and few analogue electronics blocs. In addition, the new generation device includes a wireless telemetry functionality which simplified bloc diagram is illustrated in Fig. 2. As the size of the final product should not be larger than its predecessor, it is necessary to tend towards a large scale integration of memory, controller, RF functionality including RF MEMS as well as analogue RF circuits.

Fig. 2. Simplified bloc diagram of the pacemaker's wireless telemetry

The proposed wireless telemetry system integrates transceivers operating respectively at the Medical Implant Communication Service (MICS) frequency band and at the 2.4 GHz Industrial Medical Scientist (ISM) frequency band. The MICS 402-405 MHz frequency band is used to transmit short range secured data and for emergency link because only the exclusive MICS band is acknowledge as safe for medical devices by Food and Drug Administration (FDA). The ISM 2.4 GHz transceiver is dedicated for the implementation of a needed ultra low power wake up system and for transmitting data under higher equivalent isotropically radiated power (EIRP) to achieve the demanded increased communication range. In addition to the bi-band transceiver, a Bulk Acoustic Wave (BAW) filter and naturally a miniaturized loop antenna are embedded into the medical microsystem.
