Sample Applications and Calculators
Diagrams show only the component positions used in the specified circuit. Unpopulated series positions may require 0 Ω jumpers. Diagrams showing all possible component positions are available here. Component values calculators are available here.
|DC Block/Coupling Cap||Y||Y||Y|
|AC Block/RF Choke||Y||Y||Y|
|Precision Shunt Termination||Y||Y||Y|
|Feed-through Decoupling Cap||Y||Y||Y|
Bandpass Filter Calculator by Raltron
High-pass/Low-pass/Bandpass/Bandstop/Notch Filter Calculator by Dale Heatherington, with frequency plots
L-C Filter Tutorial and Calculator by the late Prof. Tony Fisher (non-profit use only)
Minimum-Loss Attenuator Calculator by Ernie Kim
These calculators will provide schematics and ideal component values for a variety of filter types (e.g. Butterworth, Chebyshev/Tchebysheff, Bessel) and attenuator configurations. Some will also provide response curves.
To implement the desired design with standard components, it may be necessary to use multiple component values in series or parallel configurations to approximate the calculated values. For example, the design for a 6 dB 50 Ω attenuator calls for a 37.4 Ω resistor, a value that is not commonly available. The attenuator can instead be built with two 75 Ω resistors in parallel, producing a very good 6 dB attenuator from standard components:
|"Ideal" 6 dB Attenuator Design||Actual 6 dB Attenuator Implementation|
A more complete Attenuator Application Note describes these techniques in more detail, including examples of many commonly-required attenuation ratios, measured performance, and oscilloscope captures.