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English: A typical characteristic curve of a current-controlled (CCNR or "S" type) negative differential resistance device, showing stable, unstable, and bistable load line regions. A DC bias current Ibias sets the operating point (Q1) in the middle of the negative resistance region where the device has differential resistance Δv/Δi = -r, as shown by the DC load line (DCL). The AC load line, set by the AC impedance Z facing the device, passes through the Q point at a different angle depending on Z. Increasing Z causes the load line to rotate counterclockwise.
  • if Z > r (green region) the load line intersects the curve once at Q1 so the circuit is stable.
  • if Z = r (line L2) the net resistance of the circuit, R+r = 0, so the circuit is unstable and will oscillate.
  • If Z < r (red region) the load line intersects the curve three times, at Q1, Q2, and Q3. The middle point Q1 is unstable, but the two outer operating points are stable, so the circuit is bistable. This biasing can be used to make flip-flops.
Since the device is stable for load resistances above r, current controlled negative resistances are called open-circuit stable. Devices with this type of negative resistance include IMPATT diodes, unijunction transistors, SCRs, and gas discharge tubes like fluorescent lights and neon lights.
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Author Chetvorno
Other versions File:Negative resistance stability regions VCNR.svg

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Date/TimeThumbnailDimensionsUserComment
current20:08, 13 May 2013Thumbnail for version as of 20:08, 13 May 2013611 × 586 (27 KB)ChetvornoChanged red and green stability region color gradients back to solid color sectors, minor label adjustments
04:09, 13 May 2013Thumbnail for version as of 04:09, 13 May 2013611 × 586 (28 KB)ChetvornoAdded example load lines L1, L2, and L3, changed red and green stability regions from sectors to radial color gradients, and changed some labels
20:06, 26 December 2012Thumbnail for version as of 20:06, 26 December 2012662 × 575 (18 KB)ChetvornoUser created page with UploadWizard

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