Abstract
ABSTRACT The ‘ total Q sensitivity ’, ΣQ, is presented as a useful figure of merit, for quantitative comparisons of the relative stability of different frequency-selective feedback networks. Physically, ΣQ gives the percentage change in Q which would result if each parameter of the network were changed by 1 % in a direction such that the effects are additive. A very simple selective feedback circuit using a distributed RC network is analysed and compared with other well-known selective networks. It is shown that ΣQ for this network (including the effects of the active element) is considerably less than that for other comparable active feedback networks (for which the active elements are not included). Therefore this network has significant advantages wherever it is not practical to use an LC tank circuit for tuning.
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