"Filters and radio system design" article has been uploaded to the RF Design Guide page
As wireless technologies have become more widespread, there are increasing demands placed on the radio spectrum. As a result more and more channel allocations are being squeezed into narrower bands with greater and greater susceptibility of interference.
One of the challenges of radio receivers is to maximise sensitivity (and therefore range) to the desired channel while at the same time suppressing, as much as possible, signals from adjacent channels and bands. With more users being squeezed into limited spectrum space, this places a lot of demand on the design of filters. Since no ideal filter exists, there are different designs each with their own advantages and disadvantages.
In order that users understand the filter types described in Circuit Design datasheets and operation guides, this article aims to summarise the various filter technologies and their functions in the transmitter/receiver chain.