Analog Circuits | 11. Two-Port Network Design - Filter Networks by Pavan | Learn Smarter
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11. Two-Port Network Design - Filter Networks

Filter networks are designed to selectively pass or block signals based on frequency, utilizing key parameters such as cutoff frequency, insertion loss, and roll-off rate. Different filter types like low-pass, high-pass, band-pass, and band-stop are categorized based on their frequency response and implementation. The chapter also covers the design principles for both passive and active filters, advanced filter responses, practical considerations, and filter realizations.

Sections

  • 11

    Two-Port Network Design - Filter Networks

    This section discusses the principles of filter networks, detailing the classifications, designs, and practical considerations essential for filtering signals based on frequency.

    Learning Practice

  • 11.1

    Introduction To Filter Networks

    This section introduces filter networks, key parameters, and their purpose in selectively passing or blocking signals based on frequency.

    Learning Practice

  • 11.2

    Filter Classification

    This section categorizes filters based on their frequency response and implementation methods, detailing low-pass, high-pass, band-pass, and band-stop filters.

    Learning Practice

  • 11.2.1

    By Frequency Response

    This section categorizes filters based on their frequency response, detailing low-pass, high-pass, band-pass, and band-stop filters along with their respective applications.

    Learning Practice

  • 11.2.2

    By Implementation

    This section discusses two main types of filter networks: passive and active filters.

    Learning Practice

  • 11.3

    Passive Filter Design

    This section details the design principles for passive filters, focusing on low-pass, high-pass, and band-pass prototypes using resistors, capacitors, and inductors.

    Learning Practice

  • 11.3.1

    Lpf Prototype (Butterworth)

    This section discusses the Low-Pass Filter (LPF) prototype based on the Butterworth design, highlighting its transfer function and characteristics.

    Learning Practice

  • 11.3.2

    Hpf Prototype

    This section introduces the High-Pass Filter (HPF) Prototype design, focusing on its circuit configuration and transfer function.

    Learning Practice

  • 11.3.3

    Band-Pass (Lc Tank)

    This section covers the design and fundamental characteristics of a Band-Pass filter using an LC tank circuit.

    Learning Practice

  • 11.4

    Active Filter Design

    Active filter design focuses on using active components like operational amplifiers to create filters with defined characteristics such as cutoff frequency and gain.

    Learning Practice

  • 11.4.1

    Sallen-Key Topology (2nd-Order)

    The Sallen-Key topology is a popular method for designing 2nd-order active filters, primarily used for low-pass filtering applications.

    Learning Practice

  • 11.4.2

    Multiple Feedback (Mfb) Filter

    The MFB filter design allows for a higher roll-off rate and stability for applications where Q < 20.

    Learning Practice

  • 11.5

    Advanced Filter Responses

    This section discusses the characteristics and behaviors of advanced filter responses, focusing on Butterworth, Chebyshev, and Elliptic filters.

    Learning Practice

  • 11.5.1

    Butterworth

    The Butterworth filter is characterized by its maximally flat passband and a specific roll-off rate depending on its order.

    Learning Practice

  • 11.5.2

    Chebyshev

    The Chebyshev filter is characterized by a sharper roll-off compared to Butterworth filters but has ripple in the passband, representing a trade-off decision in filter design.

    Learning Practice

  • 11.5.3

    Elliptic (Cauer)

    Elliptic filters, also known as Cauer filters, are characterized by ripples in both the passband and stopband, providing the fastest roll-off among filter types.

    Learning Practice

  • 11.6

    Filter Realizations

    This section discusses different realizations of filter networks, specifically highlighting LC ladder networks and surface acoustic wave (SAW) filters.

    Learning Practice

  • 11.6.1

    Lc Ladder Networks

    This section covers the concept of LC Ladder Networks, specifically focusing on their structure and applications as low-pass filters.

    Learning Practice

  • 11.6.2

    Saw/baw Filters

    This section introduces Surface Acoustic Wave (SAW) and Bulk Acoustic Wave (BAW) filters, focusing on their frequency ranges and applications.

    Learning Practice

  • 11.7

    Practical Considerations

    This section emphasizes the impact of component tolerances and parasitic elements in filter network design.

    Learning Practice

  • 11.7.1

    Component Tolerances

    This section discusses the importance of component tolerances in filter network design, particularly focusing on capacitors and inductors.

    Learning Practice

  • 11.7.2

    Parasitics

    This section defines parasitic elements resulting from PCB traces, which can introduce inductance into electronic circuits.

    Learning Practice

References

ee4-ac-11.pdf

Class Notes

Memorization

What we have learnt

  • Filters are categorized as ...
  • Passive filters utilize onl...
  • Advanced filters, such as C...

Final Test

Revision Tests