FPGA - based soft radio transmitter

Abstract

FPGA technology contains both memory and logic elements along with an intellectual property (IP) processor core to implement a computer and custom hardware for system-on-chip (SOC) applications. This approach has been termed system-on-programmable-chip (SOPC). This project carriers out a sophisticated design of a digital system using techniques, along with a variety of digital and analog interface technologies to build a device. I have implemented a soft radio transmitter using AM modulation techniques. The Video

Graphics Array (VGA) Digital-to-Analog converter (DAC) can process sampling rates above 50

Msamples/sec. It is therefore possible to directly generate an amplitude modulation radio signal in the standard AM band of 530 kHz to 1700 kHz. I will have used direct digital synthesis (DDS) to generate a 1.0-MHz sine wave for a carrier, then multiplied the carrier by an audio signal consisting of either a 400-Hz direct digital synthesis unit or audio from the audio codec. With this project, I have implemented the AM modulator with the directly synthesized carrier and the audio baseband signal on an FPGA. As the high-frequency output, the VGA output with the ADV7123 330-MHz triple 10-bit high-speed video DAC is used.