5. MOSFET Amplifiers
MOSFET amplifiers are essential components in modern electronics due to their high input impedance and low power consumption. Various configurations, including Common Source, Common Drain, and Common Gate configurations, provide distinct characteristics suitable for different applications. Proper biasing techniques ensure the MOSFET operates efficiently within the saturation region, maintaining signal integrity and thermal stability.
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5.5Common Source Amplifier
The Common Source Amplifier is a crucial MOSFET configuration known for its...
What we have learnt
- MOSFETs amplify signals when biased in saturation region.
- Common Source configuration offers high gain with a 180° phase shift.
- Common Drain configuration acts as a unity gain buffer, while Common Gate configuration is suited for high-frequency applications.
Key Concepts
- -- MOSFET
- A type of field-effect transistor that is used for switching and amplifying signals.
- -- Common Source Amplifier
- A MOSFET configuration known for its high gain and moderate input/output impedance.
- -- Common Drain Amplifier
- Also known as a source follower, this configuration has a high input impedance and provides unity gain.
- -- Biasing Techniques
- Methods used to set the operating point (Q-point) of a MOSFET to ensure it functions effectively in the saturation region.
- -- Transconductance (gm)
- The ratio of the change in the drain current to the change in gate-to-source voltage, indicating the gain of the amplifier.
- -- Frequency Response
- The behavior of the amplifier's gain as a function of frequency, which is affected by internal capacitances and external components.
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