Individual analogue switches can be grouped together into standard IC packages to form devices with multiple switching configurations of SPST (single-pole single-throw) and SPDT (single-pole double-throw) as well as multi channel multiplexers. The rapid switching between the “ON” and the “OFF” state is usually controlled by a digital signal applied to the control gate of the switch.Īn ideal analogue switch has zero resistance when “ON” (or closed), and infinite resistance when “OFF” (or open) and switches with R ON values of less than 1Ω are commonly available. Power Switches – Power Supplies and General “Standby Power” Switching Applications, Switching of Larger Voltages and Currents …etc.Īnalogue or “Analog” switches are those types that are used to switch data or signal currents when they are in their “ON” state and block them when they are in their “OFF” state.Digital Switches – High Speed Data Transmission, Switching and Signal Routing, Ethernet, LAN’s, USB and Serial Transmissions …etc.Analogue Switches – Used in Data Switching and Communications, Video and Audio Signal Switching, Instrumentation and Process Control Circuits …etc.They can basically be sub-divided into 3 different main groups for switching applications and in this combinational logic section we will only look at the Analogue type of switch but the principal is the same for all types including digital. Solid state switches come in a variety of different types and ratings, and there are many different applications for using solid state switches.
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