Electronic Filters
Insertion loss is a figure of merit for an electronic filter and this data is generally specified with a filter. Insertion loss is defined as a ratio of the signal level in a test configuration without the filter installed (|V1|) to the signal level with the filter installed (|V2|). This ratio is described in dB by the following equation:
Note that, for most filters, |V2| will be smaller than |V1|. In this case, the insertion loss is positive and measures how much smaller the signal is after adding the filter.
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