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Picotest

Measuring MOSFET Gate Resistance



The OMICRON Lab Bode 100 Network Analyzer, used in conjunction with the Picotest J2130A DC Bias Injector, is a perfect combination for measuring the internal gate resistance of a MOSFET. The Bias Injector allows the resistance to be measured with a DC voltage applied from the gate to the source of a MOSFET while leaving the drain floating or connected to the source. The Bode 100 then measures the vector impedance of the junction. This measurement is very sensitive, since the resistance is very small compared with the capacitive impedance. This measurement requires a very low noise floor and exceptional resolution, both of which are provided by the Bode 100.


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