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| Keywords: Tunnel diode amplifier.svg tunnel diode can amplify a signal using negative differential resistance The DC voltage V<sub>b</sub> biases the tunnel diode TD into its negative resistance region and also supplies the power used in amplifying the signal For stability the resistor R must be less than the diodes negative resistance r Therefore the total resistance of both devices in series r - R is a small negative value Therefore a small increase in the input voltage V<sub>i</sub> causes a large decrease in the current causing a large increase in the voltage across the diode Using the equation for a voltage divider the AC output voltage is <math>V_o \frac r r - R V_i \ </math><br /> Since the denominator is smaller than the numerator the circuit has positive gain<br /> <math>G \frac r r - R \ </math><br /> 2012-09-27 08 59 10 own Chetvorno cc-zero Uploaded with UploadWizard Tunnel diode diagrams Negative resistance Resistor schemas | ||||
