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Abstract
FPGA-BASED FM MODULATOR WITH CARRIER DERIVED FROM A MODIFIED SINGLE OP-AMP JERK CIRCUIT
Tchahou Tchendjeu Achille Ecladore*, Alombad Henry Njimboh, Noula Moungang Thomas, Tchitnga Robert, Fotsin Hillaire Bertrand
ABSTRACT
In this paper, a digital oscillator derived from a modified single op-amp jerky type circuit as carrier of an FM modulator and its FPGA implementation is proposed. We studied the dynamics of the modified oscillator circuit jerky type and we derived from this study a stable oscillator so that its frequency can be controlled by one of its parameters. The regular oscillator designed is used to build a digital FM modulator and its FPGA-based implementation. The proposed digital FM modulator is made of a digital solver and a digital-to-analog converter. The post-synthesis of the modulator described with VHDL with fixed-point operations as per IEEE754 standards to be deployedon cyclone IV-EEP4CE115F29C7N of the board DE2-115 presents the following results: 10 688 logic elements, 96 registers, 35 embedded multipliers and an estimated power consumption of 152.83mW. In general, the proposed modulator design presents low area and power consummation. From the experimental results, it can be seen clearly and concluded that the model could be used as a digital modulator.
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