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Keywords: Active negative differential resistances.svg characteristic curves of active negative differential resistances voltage controlled or N-type left and current controlled or S-type right Amplifying devices such as transistors vacuum tubes and op amps with positive feedback have this type of negative resistance and are used in feedback oscillators and active filters 2014-05-03 19 17 32 own Chetvorno cc-zero Uploaded with UploadWizard Negative resistance |