An analysis of wireless inductive coupling for High Data Rate biomedical telemetry using a new VHDL n-PSK modulator

We present in this work the analysis, investigation and experimental measurements for a high data rate (HDR), modulator design for biodevice telemetry over wireless inductive coupling. That has been achieving by programming a code description and implementation on an FPGA/CLPD. A new VHDL designed n-PSK modulator programmed with VHDL code generates digital BPSK, QPSK and 8PSK signals. However, comparing to the conventional analogue modulators, this type of modulator offers the flexibility to reconfigure and upgrade. The system has been designed to operate from inductively coupled RF power. Furthermore, we propose a modified a hybrid class E/F power amplifier system design, working at low radio frequency; in this work it is 135 KHz for modulated RF power with ASK modulator. The minimum magnetic field and powering range of the reader is considered in detail. The prototype system has been solved and performance simulated by using Matlab/ Simulink and was evaluated by lab measurement.