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selectivity vs blocking-difference between selectivity and blocking

This page compares selectivity vs blocking and mentions difference between selectivity and blocking. It mentions links to difference between selectivity and sensitivity.


Definition: The ability to filter out interference from other RF devices operating in the same band i.e. nearby frequencies is known as selectivity.

The wireless transceiver having good RF selectivity maintains good RF coverage range. If the wireless system has poor selectivity than interfering RF systems need to be moved away physically.


selectivity vs blocking

Definition: The ability to filter out interference from RF devices operating in the other bands i.e. farther away in frequency is known as blocking.

The "blocking" ratio is expressed as ratio of level of unwanted signal to level of wanted signal. It is specified in unit of dB.

Example: Zigbee transceiver usually supports 65 dB of adjacent channel rejection at 12.5 KHz offset. This is selectivity specification. It supports 90 dB blocking specification.

Refer Receiver sensitivity vs selectivity>> which mentions basic definitions of receiver selectivity and sensitivity and mentions measurement setups for both of them.

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