**2. Pacemaker telemetry overview**

Pacemaker industry is entering into the era of home monitoring technology. Home monitoring enables pacemaker's patients to be remotely followed-up via secured wireless or telephone networks as shown in Fig. 1. Depending on the patient's health status, the transfer of information could be done daily, weekly or monthly, and can be also triggered by the patient himself if he feels symptomatic. Home monitoring enhances patient safety and comfort, reduces pacing clinic visits and trips to the emergency room cutting down the overall healthcare costs and help the physicians better understand the patient's condition in less time.

Fig. 1. Pacemaker home monitoring telemetry system

Most of existing antenna-impedance tuning units [7-15] operates iteratively to successfully adapt source and load impedances. However, iterative methods generally spend several hundred milliseconds to calibrate the system and are not well suited to low power pacemaker applications where energy is lost during the calibration as the proper state

The design of an energy efficient antenna-impedance tuning units based on a single step calibration method is proposed in this chapter to achieve a low power automatic matching process. The proposed method aims to extract the antenna complex impedance value in order to calculate the parameters of the network that match the extracted antenna

In this chapter, we describe briefly the pacemaker telemetry system, the design constraints and the limitations in section II. Since the pacemaker antenna is easily detuned by tissues, we challenge to characterize the impedance of the antenna immersed into different realistic human model in section III. In section IV, we propose a novel antenna impedance tuning method based on a single step process calibration to adapt automatically the antenna

Pacemaker industry is entering into the era of home monitoring technology. Home monitoring enables pacemaker's patients to be remotely followed-up via secured wireless or telephone networks as shown in Fig. 1. Depending on the patient's health status, the transfer of information could be done daily, weekly or monthly, and can be also triggered by the patient himself if he feels symptomatic. Home monitoring enhances patient safety and comfort, reduces pacing clinic visits and trips to the emergency room cutting down the overall healthcare costs and help the physicians better understand the patient's condition in less time.

impedance to the impedance of the RF power module at a selected frequency.

impedance to the optimal impedance of the front-end radio.

Fig. 1. Pacemaker home monitoring telemetry system

configuration of the system is not yet obtained.

**2. Pacemaker telemetry overview** 

To allow home monitoring of the patient, it is necessary to integrate a wireless telemetry system into the medical device. Implantable pacemaker telemetry system provides a means for receiving downlink information from an external base station to the implanted medical device, and for transmitting uplink signals from the implanted device to the external unit.
