Analog Electronics — question 7 of 10
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You sample a sensor signal at fs = 1kHz, expecting a clean 10Hz waveform, but your captured data shows a slowly drifting sinusoid near 100Hz that shouldn't physically exist in the sensor. You suspect aliasing from an unfiltered interferer. What is the lowest frequency, above your signal band, that could fold down and appear as a 100Hz alias, and how would you fix the front end?
This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.