Received signal strength indicator (RSSI) for ST25RU3993

PublishTime： 2022-05-16 Manufacturer： ST Type： Application note & Design Guide Language： English

The ST25RU3993 UHF RFID reader IC comprises an integrated received signal strength indicator (RSSI) for the received I and Q signals. Thanks to this feature it is possible to gauge the power level of an incoming transponder signal or to detect external RF signal levels in the vicinity of the carrier frequency.
The received tag signal is split into an in-phase (I) and a quadrature (Q) version (I, Q), which are fed to two 4-bit logarithmic A/D converters. The result is two logarithmic absolute values, proportional to the input power at the mixer input ports. With the I and Q values it is possible to calculate the phase relation between the carrier signal and the received signal.

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