What do you mean by subthreshold conduction?
Subthreshold conduction or subthreshold leakage or subthreshold drain current is the current between the source and drain of a MOSFET when the transistor is in subthreshold region, or weak-inversion region, that is, for gate-to-source voltages below the threshold voltage.
What causes subthreshold current?
Subthreshold leakage current is mainly due to drain-induced barrier lowering or DIBL. The source is then able to inject charge carriers into the surface of the channel resulting in subthreshold leakage current. DIBL is pronounced in high drain voltages and short channel devices.
What is the subthreshold region?
subthreshold region is the region where a MOS is being operated below the threshold voltage. There are three operating region for MOS : subthreshold region, linear region and saturation region.
What is leakage current in MOSFET?
leakage current is defined as the current that “leaks” between drain and source (D/S) of a MOSFET when the device is OFF, i.e, its Vgs is below the device threshold voltage.
What is a subthreshold?
Definition of subthreshold : inadequate to produce a response subthreshold dosage a subthreshold stimulus.
What is a subthreshold change in membrane potential?
Subthreshold membrane potential oscillations are membrane oscillations that do not directly trigger an action potential since they do not reach the necessary threshold for firing. Neurons produce action potentials when their membrane potential increases past a critical threshold.
What is the significance of subthreshold slope on the performance of the circuit?
The subthreshold slope is a feature of a MOSFET’s current–voltage characteristic. In the subthreshold region, the drain current behaviour – though being controlled by the gate terminal – is similar to the exponentially decreasing current of a forward biased diode.
How can subthreshold current be reduced?
Unlike gate leakage, subthreshold leakage cannot be solved by MOS structures nor by introducing new material. One of the feasible solutions is by combinational use of Low- Vt transistors for its high-speed capability and High- Vt transistors for very small leakage current.
What is subthreshold warfare?
Arguably a new character on the stage is sub-threshold warfare, a type of warfare where open armed conflict is avoided yet confrontation is clearly happening. Examples of this could be the Salisbury attacks, Chinese activities along the 9 Dash Line or western interventions in Iraq and Syria.
What is a subthreshold action potential?
What is subthreshold psychology?
adjective Psychology, Physiology. (of a stimulus) too weak to produce a response.
How to study subthreshold conduction effect in more detail?
To study subthreshold conduction effect in more detail let us redraw the curve of on logarithmic scale as shown in Figure below. From the IDS-VGS curve in log scale it is clear that current does not drop to zero immediately for VGS < VTH but actually decays in an exponential fashion.
Why subthreshold current is not present in digital circuit design?
• In digital circuit designs the presence of subthreshold current is not desirable because it deviates the transistor from its ideal switch like behaviour which require that current should drop as fast as possible once the gate to source voltage falls below VTH.
What is the sub-threshold region of a gate?
The sub-threshold region corresponds to having the device biased with v. BS ≤ 0, v. DS ≥ 0, and v. GS near, but below threshold, V. T. gate is biased positively and a bit less than threshold. At the source end of the gate, electrons will spill into the region under the gate as we have just calculated.