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The theory of shadow filters, a new family of second-order filters recently introduced, is extended to class n filters, where n is a positive integer. It is shown that their centre frequency f0An is given by f0An=f0(1-A)n/2 where f0 is the centre frequency of the starting unity gain filter and A the gain of amplifiers. Simulation results of a practical example implemented for n=2 are given. They entirely...
Several communications techniques are currently being investigated: software radio, cognitive radio and encrypted communications are first of all presented in the first part of this paper. The second part makes the state of the art of research on agile and reconfigurable filters, passive as well as active, necessary for transceivers. Various tables for comparison are given.
A current processing filter with two transfer functions (bandpass and notch/allpass) directly available is described. It uses a first generation current conveyor and six passive components. It is demonstrated that the choice of the passive component values leads to low passive and active sensitivities. The frequency f/sub 0/, and the quality factor, Q, can be chosen independently as regards the notch/allpass...
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