File:Negative resistance stability regions VCNR.svg

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English: A typical characteristic curve of a voltage-controlled negative differential resistance (VCNR or N type) device, showing regions of stable, unstable, and bistable load lines. A DC bias voltage Vbias 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, example load line L1) 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, example load line L3) 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 resistances below r, voltage controlled negative resistances are called short-circuit stable. Devices with this type of negative resistance include tunnel diodes and Gunn diodes.
Date
Source Own work
Author Chetvorno
Other versions File:Negative resistance stability regions CCNR.svg

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26 December 2012

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current20:05, 13 May 2013Thumbnail for version as of 20:05, 13 May 2013627 × 597 (24 KB)wikimediacommons>ChetvornoChanged red and green stability region color gradients back to solid color sectors, minor label adjustments

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