Analog Circuits | 5. MOSFET Amplifiers by Pavan | Learn Smarter
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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.

Sections

  • 5

    Mosfet Amplifiers

    This section discusses the fundamentals and various configurations of MOSFET amplifiers, including their key performance metrics.

    Learning Practice

  • 5.1

    Amplifier Fundamentals

    Amplifiers convert small input signals to larger output signals with minimal distortion, quantified by key performance metrics.

    Learning Practice

  • 5.2

    Common-Source (Cs) Amplifier

    The Common-Source (CS) Amplifier is a critical amplifier type that provides significant voltage gain and is widely used in electronic circuits.

    Learning Practice

  • 5.2.1

    Basic Circuit

    This section provides an overview of the basic circuit of a common-source amplifier, highlighting its configuration and function.

    Learning Practice

  • 5.2.2

    Key Equations

    This section covers the essential equations for the Common-Source MOSFET amplifier, including voltage gain, input impedance, and output impedance.

    Learning Practice

  • 5.2.3

    Design Example

    This section covers a design example for a Common-Source (CS) amplifier, showcasing steps required to meet specific performance specifications.

    Learning Practice

  • 5.3

    Common-Drain (Source Follower)

    The Common-Drain or Source Follower configuration serves primarily as an impedance buffer with a voltage gain close to one.

    Learning Practice

  • 5.3.1

    Circuit Configuration

    This section discusses the circuit configuration of the Common-Drain (Source Follower) MOSFET amplifier, including its voltage gain and applications.

    Learning Practice

  • 5.3.2

    Characteristics

    This section discusses the characteristics of the common-drain (source follower) amplifier, including its voltage gain and applications.

    Learning Practice

  • 5.4

    Common-Gate (Cg) Amplifier

    The Common-Gate (CG) amplifier configuration provides a voltage gain coupled with a low input impedance, suitable for specific applications.

    Learning Practice

  • 5.4.1

    Circuit Topology

    This section introduces the circuit topology of the Common-Gate (CG) amplifier, focusing on its configuration and essential performance parameters.

    Learning Practice

  • 5.4.2

    Performance Parameters

    This section outlines the performance parameters of the Common-Gate (CG) amplifier, including its gain characteristics and impedance values.

    Learning Practice

  • 5.5

    Active Load Configurations

    Active Load Configurations utilize current mirror loads to enhance operational efficiency and voltage gain in MOSFET amplifiers.

    Learning Practice

  • 5.5.1

    Current Mirror Load

    The Current Mirror Load section discusses the configuration and advantages of using active load configurations in MOSFET amplifiers to achieve high DC gain without the need for additional resistor components.

    Learning Practice

  • 5.5.2

    Gain Enhancement

    The section discusses gain enhancement in MOSFET amplifiers, particularly through the use of a cascode stage, which can significantly boost the voltage gain.

    Learning Practice

  • 5.6

    Frequency Response

    This section discusses the frequency response of MOSFET amplifiers, focusing on dominant pole calculation and the Gain-Bandwidth Product (GBW).

    Learning Practice

  • 5.6.1

    Dominant Pole Calculation

    This section focuses on calculating the dominant pole in MOSFET amplifiers, exploring the effects of feedback capacitance and its implications in frequency response.

    Learning Practice

  • 5.6.2

    Gain-Bandwidth Product (Gbw)

    The Gain-Bandwidth Product (GBW) is a crucial parameter that combines the gain of an amplifier with its bandwidth, enabling the assessment of its performance.

    Learning Practice

  • 5.7

    Advanced Topologies

    This section outlines advanced amplifier topologies focusing on differential pairs and folded cascodes, emphasizing their benefits and applications.

    Learning Practice

  • 5.7.1

    Differential Pair

    The differential pair configuration is crucial for achieving high common-mode rejection and is a fundamental aspect of operational amplifiers.

    Learning Practice

  • 5.7.2

    Folded Cascode

    The Folded Cascode offers advantages such as wider output swing and improved power supply rejection ratio (PSRR) in amplifier designs.

    Learning Practice

References

ee4-ac-5.pdf

Class Notes

Memorization

What we have learnt

  • MOSFET amplifiers convert s...
  • Different amplifier configu...
  • Practical design considerat...

Final Test

Revision Tests