Texas Instruments Incorporated Deutschland, Gmbh

Gerhard Eberth

Konstantin O Aslanidis

Adolf Baumann

Johann Hoffmann

Alfons Lichtenegger

Wolfgang Ramin

Heiner Brenninger

Christian Ecker

A method of tuning the resonance frequency of a transponder to a target frequency is described, wherein a transponder comprises a film antenna with an IC (IC) mounted to the film antenna (L) and an integrated resonance capacitor (C) is part of a IC. During testing of IC at chip probe to determine the pass/fail of the IC, the integrated resonance capacitor (C) is measured and the value is stored with the pass/fail data of the wafer map. Then after mounting a passed IC (IC) to a film antenna (L) with variable inductance, retrieve the integrated resonance capacitance value from the wafer map and calculate the amount of inductance necessary to achieve the target frequency. Tune the film antenna (L) to achieve the necessary inductance, measure the transponder resonance frequency, and compare the transponder resonance frequency to the target frequency.

Method of trimming film type antennas

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Eching, Germany

Gerhard Eberth