page_title: Electronic filter
section_title: Image impedance analysis
hierarchical_section_title: Electronic filter / Classification by design methodology / Image impedance analysis
caption_attribution_description: Zobel network (constant resistance) filter. 5 sections. Scaled for comparability with other plots in Electronic filters article
context_page_description: Electronic filters are a type of signal processing filter in the form of electrical circuits. That is, using components and interconnections that, in analysis, can be considered to exist at a single point. These components can be in discrete packages or part of an integrated circuit.
  Electronic filters remove unwanted frequency components from the applied signal, enhance wanted ones, or both. They can be:
  passive or active
  analog or digital
  high-pass, low-pass, band-pass, band-stop, or all-pass.
  discrete-time or continuous-time
  linear or non-linear
  infinite impulse response or finite impulse response
  The most common types of electronic filters are linear filters, regardless of other aspects of their design. See the article on linear filters for details on their design and analysis.
context_section_description: This approach analyses the filter sections from the point of view of the filter being in an infinite chain of identical sections.  It has the advantages of simplicity of approach and the ability to easily extend to higher orders.  It has the disadvantage that accuracy of predicted responses relies on filter terminations in the image impedance, which is usually not the case.
caption: Zobel network (constant R) filter, 5 sections
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