Radio frequency power measurement

摘要

An unknown RF power is converted to a voltage by a detector ( 11 ). The voltage is converted to a number by a digitiser ( 12 ). A separate and fixed RF power reference ( 14 ) drives a second detector ( 15 ), whose voltage output is also converted to a number by the digitiser ( 12 ). The RF detectors are thermally coupled. Temperature variations in the RF power to voltage characteristic of the detector ( 11 ) are corrected by measuring the RF power reference ( 14 ) via the detector ( 15 ).