What is an analog switch?
Sometimes it is also referred to as a bilateral switch or gear gateway, an analog switch is an electronic device that selectively passes or blocks the signal level from the input to the output. The semiconductor component in solid state is endangered by the transistor of the NMOS and the PMOS transistor. Its control gates are configured in a way that both transistors are turned on or off. Common applications for analog switches include instrumentation, process control, data collection, communication systems and video systems. It acts as a separate circuit and has the ability to insulate one or more components from live signals during the removal or insertion of hot. When used in security applications, it can selectively prevent sensitive signals or data without valid hardware permission.
The ideal analog switch has endless resistance when it is turned off and zero resistance when it is turned on. It also has flawless linear characteristics of the ampere when transmitting analog signals. But the truth is that mostAnalog switches are not ideal. This may be true, because they are essentially semiconductor components in a solid state and tend to show non -zero resistance when it is turned on, the final resistance when it is turned off, and non -linear characteristics of the ampere.
Like the mechanical switch, the analog switch comes in many forms, which is largely depending on the number of feasts and poles it has. Although it is often used to describe the mechanical switch , one -pound one hour (SPST) and single -pole double throw (SPDT) are among the most common of these switches. One integrated circuit (IC) may also contain multiple analog switches, each corresponding to a specific analog channel.
The gateway for an analog switch can be created and the circuit configuration. Some of these configurations are very simple and often consist of numerous resistors and only diodes. SentencesHowever, the shine of commercial switches uses field effects (FET), highly advanced bipolar transistors or a combination of both to facilitate the passage or blocking of analog signals. FET is used in analog switchboards more often due to their low closed resistance and high open resistance.
Analog switch behaves a lot like a relay. The main difference is that it has no moving parts and does not provide insulation between the analog signal and the control signal. For this reason, it is not recommended for use in high -level circuits where electrical insulation is required. It is also important to note that because there is a low path between the input and the output, the maximum current is able to pass an analog switch usually less than the average relay.