Analysis of noise and non-linearity of I-V characteristics of positive temperature coefficient chip thermistors

• Autorzy: Sita Z. , Sedlakova V. , Majzner J. , Sedlak P. , Sikula J. , Grmela L.
• Języki publikacji: EN

Abstrakty

EN

Noise spectroscopy and I-V characteristic non-linearity measurement were applied as diagnostic tools in order to characterize the volume and contact quality of positive temperature coefficient (PTC) chip sensors and to predict possible contact failure. Correctly made and stable contacts are crucial for proper sensing. I-V characteristics and time dependences of resistance were measured for studied sensors and, besides the samples with stable resistance value, spike type resistance fluctuation was observed for some samples. These spikes often disappear after about 24 hours of voltage application. Linear I-V characteristics were measured for the samples with stable resistance. The resistance fluctuation of burst noise type was observed for some samples showing the I-V characteristic dependent on the electric field orientation. We have found that the thermistors with high quality contacts had a linear I-V characteristic, the noise spectral density is of 1/f type and the third harmonic index is lower than 60 dB. The samples with poor quality contacts show non-linear I-V characteristics and excess noise is given by superposition of g-r and 1/fⁿ type noises, and the third harmonic index is higher than 60 dB.

Słowa kluczowe

EN

PTC chip sensors; noise spectroscopy; I-V characteristic non-linearity; quality evaluation

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2013
• Tom: Vol. 20, nr 4
• Strony: 635--644
• Opis fizyczny: Bibliogr. 16 poz., rys., wykr.

Twórcy

autor

Sita Z.

• EPCOS s.r.o. Šumperk, Feritová 1, 78705 Šumperk, Czech Republic

autor

Sedlakova V.

• Czech Noise Research Laboratory, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Physics, Technicka 8, 616 00 Brno, Czech Republic

autor

Majzner J.

• Czech Noise Research Laboratory, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Physics, Technicka 8, 616 00 Brno, Czech Republic

autor

Sedlak P.

• Czech Noise Research Laboratory, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Physics, Technicka 8, 616 00 Brno, Czech Republic

autor

Sikula J.

• Czech Noise Research Laboratory, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Physics, Technicka 8, 616 00 Brno, Czech Republic

autor

Grmela L.

• Czech Noise Research Laboratory, Brno University of Technology, Faculty of Electrical Engineering and Communication, Department of Physics, Technicka 8, 616 00 Brno, Czech Republic

Bibliografia

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Uwagi

EN

Research described in the paper was financially supported by the European Centres of Excellence CEITEC CZ.1.05/1.1.00/02.0068 and within the project GACR P102/11/0995 "Electron transport, Noise and Diagnostic of Schottky and Autoemission Cathodes".