Negative Resistance

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negative resistance

[′neg·əd·iv ri′zis·təns]
The resistance of a negative-resistance device.

Negative Resistance


a property of certain electric circuit elements that is manifested by a reduction of the voltage drop U across the elements when the current I flowing through them is increased (or vice versa). Negative resistance is defined as the quantity.

R- = (ΔUI) < 0

An element with a negative resistance does not consume electric energy but supplies such energy to the circuit; that is, it is an active element. This situation arises because the element contains a source that supplements the energy supply of the circuit.

A negative resistance can be obtained only in a certain region of current and voltage values; outside of that region, (ΔUU) > 0. A negative resistance indicates the existence of a decreasing section AB in the element’s volt-ampere characteristic (see Figure 1).

Figure 1

The nature of negative resistance is different in different active elements. If the absolute value of the negative resistance in an element is less than the sum of the positive resistances in the other elements of a circuit, the negative resistance simply provides partial compensation for the circuit losses. If the negative resistance exceeds this sum, the state of the circuit is unstable; there can occur a transition to a state of stable equilibrium or the production of oscillations.


References in periodicals archive ?
Then the design, nonlinearity, stability, and noise considerations of the Q-enhanced technique using negative resistances to compensate resistive losses of inductors will be investigated.
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Paul, "Aspects of the Design of Low Noise, Negative Resistance Reflection Mode Transistor Amplifiers," IEEE Transactions on Microwave Theory and Techniques, Vol.
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CCCIIs with negative resistance realizations were introduced in [11], [12].
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Chapter 8 considers voltage-controlled oscillators, including different methods of generating a negative resistance, basic differential oscillator topologies, tunability and amplitude control circuits.

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