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Abstract
A simple analysis is presented for obtaining an expression for the transfer function and hence the selectivity, QT, of a general parallel-T resistance capacitance network. The maximum value of QT obtainable by a suitable choice of elements is shown to be ½. A design procedure for approaching this maximum value is given.
An expression has been given for estimating the departure from linearity of the amplitude response characteristic at a particular frequency. This is used to find an optimum value of QT for best performance of the network as an F.M. discriminator at low frequencies. It is shown that the required value of QT is very near its maximum value.
An expression for the selectivity, QA, of an amplifier using a general parallel-T resistance capacitance network in the negative feedback line has been deduced and the advantages of having an increased QT explained.