Digital Single-Side Band Modulation Using Digital Signal Processor

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Provided by: AICIT
Topic: Hardware
Format: PDF
In this paper, the authors describe the design of a digital single-side band amplitude modulator with 40 kHz output using high-performance digital signal processor for ultrasonic transmitters. The baseband signal is converted to zero-IF signal by using quadrature frequency converter. Then zero-IF signal is filtered by two low-pass filter and converted to output frequency by frequency quadrature up-conversion. It is implemented by using single fixed-point digital signal processor. Experimental result shows that the digital modulation function is well operated, and performance of side-band rejection is better than 50 dB isolation.
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