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The L-section is identical topology to the potential divider topology. The T-section is identical topology to the Y topology. The Π-section is identical topology to the Δ topology. All these topologies can be viewed as a short section of a ladder topology. Longer sections would normally be described as ladder topology. These kinds of circuits ...
Balanced bridged-T topology; Open-circuit L-section topology; Short-circuit L-section topology; Balanced open-circuit C-section topology; Balanced short-circuit C-section topology; The bridged-T topology is also used in sections intended to produce a signal delay but in this case no resistive components are used in the design.
Schematic circuit of a Π-pad attenuator. The Π pad (pi pad) is a specific type of attenuator circuit in electronics whereby the topology of the circuit is formed in the shape of the Greek capital letter pi (Π). Attenuators are used in electronics to reduce the level of a signal.
The simple conversion procedure shown in the previous section can only be applied in a limited set of conditions – generally, some form of bridged-T circuit is necessary. Many of the conversions require the inclusion of a 1:1 ideal transformer, [ 14 ] but there are some configurations which avoid this requirement, and one example is shown below.
Filters using passive filter and active filter technology can be further classified by the particular electronic filter topology used to implement them. Any given filter transfer function may be implemented in any electronic filter topology. Some common circuit topologies are: Cauer topology – passive; Sallen–Key topology – active
Lattice equivalent of a T-section high-pass filter Lattice equivalent of a Zobel bridge-T low-pass filter. It is possible to use the Bartlett transformation in reverse; that is, to transform a symmetrical lattice network into some other symmetrical topology. The examples shown above could just as equally have been shown in reverse.
Z i 2 is facing Z i 2 to provide matching impedances Showing how a 'Π' section is made from two cascaded 'L' half-sections. Z i 1 is facing Z i 1 to provide matching impedances. As an example, the derivation of the image impedances of a simple 'L' network is given below. The 'L' network consists of a series impedance, Z, and a shunt admittance, Y.
Here "L" should not be confused with the inductance L – in electronic filter topology, "L" refers to the specific filter shape which resembles inverted letter "L". The sections of the hypothetical infinite filter are made of series elements having impedance 2Z and shunt elements with admittance 2Y. The factor of two is introduced for ...