Graduate Thesis Or Dissertation
 

Characteristics of RC digital filters as bandpass circuits

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  • One of the most promising methods of constructing bandpass filters without inductors is the RC digital filter. It is simply a number of parallel RC branches which are sequentially switched between the source and the load. If the source signal is at the same frequency as the switching rate of the RC branches, it will pass through to the load, virtually unattenuated. As the frequencies begin to differ, there is a rapid increase in the amount of attenuation. The design relationships are very simple compared to LC circuits with comparable values of Q. The RC branches are designed for a low pass response in the conventional manner and it is then transposed to center around the switching frequency. As this switching frequency increases, the bandwidth remains constant, and large values of Q and thus obtained. Low pass and broad bandpass filters are normally required at the input and output of the digital filter, but their design is usually very simple and easy to construct. They are necessary to eliminate the undesirable harmonic properties of the digital filter. Digital filters will probably be constructed entirely by integrated circuit techniques in the future; at present, other techniques are required since the values of capacitance now obtainable by this process are limited. This paper will follow a derivation for the transfer function of a digital filter, show results of some laboratory tests, outline a design procedure, and briefly describe one presently in commercial use.
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