. Electronic apparatus for biological research . URl2w^ 0^/? cye--V2ac;'/2 OTHER L-C FILTERS The subject of filters is a vast one, and we can do no more than mention some of the other types. Readers faced with particularly stringent filter problems should refer to a speciahst work on the subject (E. A. Guillemin, Communication Networks, New York; Wiley). The transmission characteristic of the classical filter is of the type known as Butterworth or maximally flat. It is possible to obtain a squarer character- istic by using a Tchebycheff type of filter, whose response is typically of the
. Electronic apparatus for biological research . URl2w^ 0^/? cye--V2ac;'/2 OTHER L-C FILTERS The subject of filters is a vast one, and we can do no more than mention some of the other types. Readers faced with particularly stringent filter problems should refer to a speciahst work on the subject (E. A. Guillemin, Communication Networks, New York; Wiley). The transmission characteristic of the classical filter is of the type known as Butterworth or maximally flat. It is possible to obtain a squarer character- istic by using a Tchebycheff type of filter, whose response is typically of the form shown in Figure ; evidently the transition between the horizontal 3 :i9 Tchebycheff ButtcrwortK U> Ol> ^»c' ^n Figure Figure and sloping parts of the curve is more abrupt. Tchebycheff filter sections are similar in configuration to the Butterworth type, but the component values are different. If the filter has to discriminate between two frequencies rather close together, a useful device is the m-derived section, which has—in the low-pass version— a characteristic like Figure This is a Butterworth response with a bottomless trough in the transition region; that is, it is a null-transmission network. If the frequency of null-transmission is to be cji).^, then to get an 90
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