Abstract
Commercially available discrete operational transconductance amplifiers (OTAs) in current use possess a limited differential input voltage range. This requires that corresponding continuous-time active RC filters operate with small input voltages in order to avoid the appearance of nonlinear behaviour of the overall circuit. Since this leads to reduced signal-to-noise ratios this active element is used mainly in integrated continuous-time active filter design. The nonlinear operation of circuits using discrete elements, with the active elements being OTAs, is studied here both theoretically and experimentally by means of the jump phenomenon. This phenomenon appears in many experimental circuits and should be a cause of concern for those who intend to use OTAs in discrete active RC filter design.
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