A new generuilired approach to the study of tho variable frequency sine-wave oscillators in active RC filters having o ainglo.element control facility is presented. The oonetraints on the filter functions which are amenablo for genoration of such oscillations with feedback are derived and o number of exemplary circuits are given and also their frequency and gain limits in tables. The oacillotion atobility ia also studied following Loeb's criterion of limit cyolo stability for syetema having ~aturation oharacteriatics in the active parts. Tho circuits om also shown to yield VCO' s with voltage controlled F E T ns tho frequency controlling pnmmater. Tho possiblo configurations of tho amplifier circuits with operntional amplifiers aa the building blook are considered inoluding s discussion on bandwidth limitation.
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