With this issue, go/semi begins a new, monthly publishing schedule. Each month, we will feature a technical note, some fundamentals and “how to” articles, and a Q&A. The technology focus will rotate between consumer electronics (digital, mixed signal); high-speed and structural test, and wireless. Watch for more exciting changes over the next few months!
And always, your feedback is welcome. Email go/semi editor with your comments!
Application Note - Method for calculating SNR for Non-integer Cycle Sine Wave
Sine waves are the most fundamental waveform used in analog tests. In the mixed-signal IC testers which use DSP (digital signal processing), they are used to calculate test parameters such as THD (total harmonic distortion), SNR (signal-to-noise ratio) and frequency characteristics with FFT (fast Fourier transform). However, if the frequency of the measured sine wave is slightly different from expected frequency, and the number of cycles of the captured waveform ceases to be an integer, then FFT processing will cause leakage and the measurement accuracy will decline. |
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