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Adam Farson, VA7OJ/AB4OJ: Evaluating Digital Receivers

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Published on Jul 11, 2016

The second and third-order intercept points (IP2 and IP3) are figures of merit for TRX specifications and allow distortion products to be computed for various signal amplitudes. Advanced SDR designs employing the ADC close to the antenna, require modified test methods to characterize strong signal performance. Terms like IP3 or intermodulation-free dynamic range fail and also terms like dither or random noise get meaning. Noise Power Ratio (NPR) an old test procedure can be very useful to benchmark SDRs and legacy analogue concepts as well. Adam will explain some fundamentals and test results.

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