Assume that Vin is either 0V or 5V.Ĭut-off Region When Vin = 0V, which is equal to VGS and is less than VT, the MOSFET acts like an open circuit. NMOS Inverter One way to analyse the operation of an NMOS inverter is to consider the MOSFET to be a switch. Usually their size is smaller than mechanical switch to allow the same amount of current to flow through the switch.The lifetime and reliability of an electrical switch is typically better than a mechanical switch.They are required in hazardous locations where sparks can ignite fires.Useful when switching is done remotely.Electrical – the conductivity of a component is changed from insulating to conducting and back again (visa versa).Debounce circuits may be needed if the switch makes intermittent contact as its position is changed.Mechanical – physical movement is require to make or break the connection.
Two common ways to connect or disconnect one part of a circuit with another:.Questions: What is the power dissipated by the Light? Why would putting the switch between the Light and ground be dangerous when changing the light bulb? The switch used in this case is a single pole, single throw (SPST). Here is a schematic for a circuit where the switch is used to connect a light bulb to the dc power supply. Operation of a Switch Typically, switches are used to connect and disconnect parts of one circuit with other parts of a circuit. However, the MOSFET has to move through the pinch-off/saturation region to get between these two regions of operation.The modes of operation are the cut-off and triode/saturation regions. In digital electronics as well as power electronics, the primary use of a MOSFET are as a switch that connect and disconnect the circuitry at the drain of the MOSFET with the circuitry at the source.They are found in high speed and/or high power amplifiers, oscillators, current sources, etc.In analogue electronics, the MOSFETs are designed to operation in the pinch-off or saturation region.
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