A Simple Digital VHDL QPSK Modulator Designed Using CPLD / FPGAs for Biomedical Devices Applications

we proposed a new simple design for a Quadrature Phase shift Keying (QPSK) modulator applied for implantable telemetry applications as demonstrated. VHDL programming code is used to generate QPSK digital signal. The input test signals data and carrier are interfaced to the CPLD and FPGAs board from Agilent function generator (E8408A). We used the local clock oscillator for test, which is operating at 25.175 MHz and used 12.5MHz for the carrier and 2Mbps reduced for data source. The modeled Modulator has been designed and simulated and performance was evaluated by measurements. The design has low power consumption and size for biomedical applications. Furthermore, the advantages of this modulator are it can be reconfigured and upgraded to enhance the data rate.

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