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Application Notes
The easiest and most intuitive method for determining the quality of a digital transmitter is to observe the time domain waveform. This is typically done using an oscilloscope. When measuring high-speed digital communications, there are two main choices for oscilloscopes: A real-time oscilloscope and an equivalent time ‘sampling’ oscilloscope. There are distinct advantages for each oscilloscope architecture when compared to the other.
Real-time oscilloscopes:
Sampling oscilloscopes:
No oscilloscope can provide an exact replica of a waveform. This would require the instrument to have infinite bandwidth, zero residual jitter, and no internal noise. However, there are scenarios where it is important to achieve the most accurate waveform possible:
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