Estimate of measurement uncertainty using analog switches in electronic test

− An analog switch is a component, which can be used in testing analog and mixed-signal units. Analog switches offer the potential to sense nodes on printed board assemblies without physical contact. Generators and analyzers are connected to edge connectors on printed board assemblies and routed via analog switches to the appropriate nodes that are to be measured. The concept of using analog switches in an analog test is introduced in this paper. Measurements of on-resistance dependence on input voltage, supply voltage and temperature are presented. Simulations are presented which show that the use of analog switches, in some cases, increases the uncertainty of measurement. How this can be treated in a manufacturing test is discussed in this paper.