Contactless radio frequency transponder/identifier having transponder and reader with antennas with transponder having analogue circuit rectifier and clock extractor output variable level

摘要

The contactless transponder identification unit has a radio frequency transponder (12) and a reader (10) with an antenna (14). There is an analogue circuit (25) with a capacitor (32) producing a rectified current (34) and a clock extractor, modulator and demodulator. The clock extractor level is of a high type, that is the output level is variable.