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MAKE A MEME View Large Image $Negative resistance vs loop gain.svg amplifier with positive feedback for different values of feedback loop gain <math>A\beta </math> showing it has negative resistance when <math> A\beta\;>\;1</math> <br /> <math>A\ </math> is the voltage ...$

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Keywords: Negative resistance vs loop gain.svg amplifier with positive feedback for different values of feedback loop gain <math>A\beta </math> showing it has negative resistance when <math> A\beta\;>\;1</math> <br /> <math>A\ </math> is the voltage gain of the amplifier<br /> <math>\beta j\omega \ </math> is the tranfer function of the feedback loop<br /> <math>R_i\ </math> is the input resistance of the amplifier <br /> The slope of the central linear segment of the graph is <math>R_f R_i \over 1 - A\beta \ </math> In electronic oscillator the negative resistance of a feedback amplifier is used to cancel the positive resistance in a tuned circuit to excite oscillations in the tuned circuit 2014-06-08 own Chetvorno cc-zero Uploaded with UploadWizard Negative resistance Device current-voltage characteristics