ElectronicsI_L11 - Lecture 11 Amplifiers and Switches Now...

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Lecture 11
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Amplifiers and Switches • Now that we have the operational modes of the MOSFET and some DC circuit behavior under our belt, we can take a look at the useful functions of the MOSFET: as an amplifier or switch. • Looking at amplifiers first, we already saw an example of how a MOSFET could be used as an amplifier. – In the saturation region, the MOSFET acts as a voltage controlled current source (ignoring channel length modulation) – But we also saw that the current followed a square law relationship to the gate voltage, not at all close to the linear behavior we want. • The way around this is to consider small signals approaches again, much like what we did in the diode • But first, let’s look at the large signal response.
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Large Signal A very common configuration for a MOSFET is called a common-source (cs) circuit. This circuit can be operated in two different modes: – Small signal amplifier – Switch We will explore over what values of inputs the circuit will act as one or
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ElectronicsI_L11 - Lecture 11 Amplifiers and Switches Now...

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