Achieve Accurate RF Testing with a Raspberry Pi-Based DDS Signal Generator

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  • Author: Erbe D. Reyta, Valentin Beleca & Mihai Bancisor

One of the most important aspects to consider in hardware testing that involves radio frequency (RF) is choosing a configurable, calibrated, and reliable signal source. This article provides a complete implementation of a Raspberry Pi-based, highly integrated solution for a synthesized RF signal generator that outputs a single tone from DC up to 5.5 GHz with output power ranging from 0 dBm to –40 dBm. The proposed system is based on a direct digital synthesis (DDS) architecture and its output power vs. frequency characteristic is calibrated, ensuring the output power stays within ±0.5 dB on the desired power level over the entire operating frequency range.

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