page_title: Lattice and bridged-T equalizers
section_title: An example
hierarchical_section_title: Lattice and bridged-T equalizers / Amplitude correction / Deriving compensation networks by means of an experimental test jig / An example
caption_attribution_description: The plot shows the frequency response of the typical equalizer;Other information: To be used in an article on equalizers.
context_page_description: Lattice and bridged-T equalizers are circuits which are used to correct for the amplitude and/or phase errors of a network or transmission line. Usually, the aim is to achieve an overall system performance with a flat amplitude response and constant delay over a prescribed frequency range, by the addition of an equalizer.
  In the past, designers have used a variety of techniques to realize their equalizer circuits. These include the method of complementary networks; the method of straight line asymptotes; using a purpose built test-jig; the use of standard circuit building blocks, or with the aid of computer programs. In addition, trial and error methods have been found to be surprisingly effective, when performed by an experienced designer.
  In video or audio channels, equalization results in waveforms that are transmitted with less degradation and have sharper transient edges with reduced overshoots than before. In other applications, such as CATV distribution systems or frequency multiplexed telephone signals where multiple carrier signals are being passed, the aim is to equalize the transmission line so that those signals have much the same amplitude.
context_section_description: An example of a “waveform corrector” for a coaxial cable section for video frequencies is shown.   The shunt impedance Z2 is not shown in detail.  It is the dual of Z1, so whereas Z1 contains a series resonant circuit and an R-C ladder network, Z2 contains a shunt resonant circuit and an R-L ladder network.
  The plot of vout/vin (in dBs) versus frequency, for this circuit, using the component values proposed in the reference is also shown, on the right.
caption: Insertion loss of waveform corrector
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