Squelch in ISM-RF Receivers

Many industrial/scientific/medical (ISM) band radio frequency (RF) receivers use a simple external data slicer to generate the baseband digital output. These simple baseband systems can generate unwanted digital output when there are no active radio transmissions. This tutorial provides a basic description of squelch and gives examples for how to implement it in an amplitude-shift keying (ASK)/on-off keying (OOK) or frequency-shift keying (FSK) system.

Squelch is the process of removing unwanted background noise from a receiver in a way that allows for a strong signal to be decoded while weak signals near the level of the receiver's sensitivity are rejected.

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