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Negative resistance
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In electronics, negative resistance is a property of some electrical circuits and devices in which an increase in voltage across the device's terminals results in a decrease in electric current throug
Fluorescent lamp, a device with negative differential resistance. In operation, an increase in current through the fluorescent tube causes a drop in v
Fluorescent lamp, a device with negative differential resistance. In operation, an increase in current through the fluorescent tube causes a drop in voltage across it. If the tube were connected directly to the power line, the falling tube voltage would cause more and more current to flow, causing it to arc flash and destroy itself. To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current.
A Gunn diode, a semiconductor device with negative differential resistance used in electronic oscillators to generate microwaves. While a positive res
A Gunn diode, a semiconductor device with negative differential resistance used in electronic oscillators to generate microwaves. While a positive resistance consumes power from current passing through it, a negative resistance produces power.
An oscillator consisting of a Gunn diode inside a cavity resonator. The negative resistance of the diode excites microwave oscillations in the cavity,
An oscillator consisting of a Gunn diode inside a cavity resonator. The negative resistance of the diode excites microwave oscillations in the cavity, which radiate through the aperture into a waveguide (not shown).
8–12 GHz microwave amplifier consisting of two cascaded tunnel diode reflection amplifiers
8–12 GHz microwave amplifier consisting of two cascaded tunnel diode reflection amplifiers
Tunnel diode
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A tunnel diode or Esaki diode is a type of semiconductor diode that has effectively "negative resistance" due to the quantum mechanical effect called tunneling. It was invented in August 1957 by Leo E
Negative resistance
…also have hysteresis and be bistable, and so are used in switching and memory circuits. Examples of devices with negative differential resistance are tunnel diodes, Gunn diodes, and gas discharge tubes such as neon lamps, and fluorescent lights. In addition, circuits containing amplifying devices such as transistors…
1N3716 tunnel diode (with 0.1" jumper for scale)
1N3716 tunnel diode (with 0.1" jumper for scale)
10 mA germanium tunnel diode mounted in test fixture of Tektronix 571 curve tracer
10 mA germanium tunnel diode mounted in test fixture of Tektronix 571 curve tracer
I vs. V curve of 10 mA germanium tunnel diode, taken on a Tektronix model 571 curve tracer.
I vs. V curve of 10 mA germanium tunnel diode, taken on a Tektronix model 571 curve tracer.