5. MOSFET Amplifiers
MOSFET amplifiers are crucial components in electronic circuits that amplify weak signals. Utilizing various configurations like common-source, common-drain, and common-gate, these amplifiers are defined by their voltage gain, input and output impedances, and frequency response. Special design considerations, including biasing techniques and layout guidelines, enhance the performance and reliability of these amplifiers in practical applications.
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What we have learnt
- MOSFET amplifiers convert small signals to larger outputs.
- Different amplifier configurations affect performance metrics like gain and impedance.
- Practical design considerations are key for effective amplifier deployment.
Key Concepts
- -- Voltage Gain (A_V)
- The ratio of the output voltage to the input voltage, indicating how much the signal has been amplified.
- -- Input Impedance (Z_in)
- The resistance an incoming signal sees when entering the amplifier circuit.
- -- CommonSource Amplifier
- A type of amplifier where the source terminal is common to both input and output, used for high voltage gain.
- -- CommonDrain (Source Follower)
- An amplifier configuration that provides impedance buffering with voltage gain close to 1.
- -- Current Mirror Load
- A load configuration that improves amplifier performance by providing a constant current irrespective of the output voltage.
- -- Miller Effect
- A phenomenon in amplifiers where feedback capacitance increases the input capacitance due to high voltage gain.
Additional Learning Materials
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