ENVELOPE DETECTOR ARCHITECTURE WITH NOISE CANCELATION
Number of patents in Portfolio can not be more than 2000
United States of America
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Issued Date -
Apr 3, 2025
app pub date -
Oct 3, 2023
filing date -
Oct 3, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
According to an embodiment, an envelope detector circuit for detecting an envelope of a signal from a sensor in a pre-amplifier circuit of a hard disk drive is provided. The circuit includes a half-wave rectifier, a low-pass filter, and a differential full-wave rectifier. The half-wave rectifier receives a differential voltage from the sensor indicating a fly height of the hard disk drive and generates a pair of single-ended output waveforms based on the differential voltage. Each pair of single-ended output waveforms has a positive polarity for a half-cycle it passes through. The low-pass filter includes a first and a second low-pass filter. The low-pass filter allows low-frequency signals from the pair of single-ended output waveforms to pass through while attenuating or blocking higher-frequency signals. The differential full-wave rectifier reconstructs a differential signal from the low-pass filter while removing DC rectified components.
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