Effect of Pulse Voltage Trimming on Different Characteristics of Polymer Thick Film Resistors

AbstractIn this work we study in more details the impact of pulse voltage trimming on different characteristics of thick film resistors based on (PVC-Graphite) resistor compositions. This study focuses on the change of resistivity, thermal coefficient of resistance and current noise. In order to realize a non cut trimming without damage to the resistor surface of thick film resistors for electronic devices, a pulse voltage trimming method (PVTM) has been developed. This trimming method having resistance adjustments are due to pulse peak voltage and the number of pulse group. TCR and current noise of trimmed resistors are considerably improved by this trimming technique in the case of higher resistivity materials and worsen in the case of lower resistivity materials and there is no loss in power handling capacity of trimmed resistors. We propose a description of pulse voltage trimming which can explain the observed changes in characteristics of the samples