What is subthreshold slope factor?
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. Its slope is the subthreshold slope.
How do you find the subthreshold slope?
The general expression for subthreshold slope (swing) is S= (d(log10Ids)/dVgs)-1. Or from the above plot, at very low Vgs, take the derivative of log values of Ids with respect to Vgs and then invert the resulted value.
How does the subthreshold current vary with the gate voltage?
That reduction means less gate voltage swing below threshold to turn the device off, and as subthreshold conduction varies exponentially with gate voltage (see MOSFET: Cut-off Mode), it becomes more and more significant as MOSFETs shrink in size.
What is meant by subthreshold swing?
The subthreshold swing is defined as the gate voltage required. to change the drain current by one order of magnitude, one. decade. In the MOSFET, the subthreshold swing is limited. to (kT/q) ln10 or 60 mV/dec at room temperature, and with.
What does subthreshold mean?
: inadequate to produce a response subthreshold dosage a subthreshold stimulus.
What is body effect?
Body effect refers to the change in the transistor threshold voltage (VT) resulting from a voltage difference between the transistor source and body. Body bias involves connecting the transistor bodies to a bias network in the circuit layout rather than to power or ground.
How do you reduce subthreshold leakage current in NMOS?
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 causes subthreshold current?
Subthreshold leakage current is mainly due to drain-induced barrier lowering or DIBL. In short channel devices, the depletion region of drain and source interact with each other and reduce the potential barrier at the source. DIBL is pronounced in high drain voltages and short channel devices.
Why subthreshold swing is important?
The subthreshold swing is an important parameter in modeling the weak inversion regime, especially for high-gain analog applications, imaging circuits, and low-voltage applications.
What is subthreshold threshold and Suprathreshold?
If you drop a pebble in a lake to create one wave, that’s like your threshold stimulus. If you drop a heavy rock, you could get several ripples and that’s like a suprathreshold stimulus. Another Analogy: If something tickles your nose but it’s not enough to make you sneeze, that’s a subthreshold stimulus.
What is a subthreshold symptom?
Subthreshold symptoms were defined for depressive, anxiety, panic, obsessive-compulsive, drug, and alcohol symptoms.
What is hot electron effect?
The hot electron (or short channel) effect is described in as occurring when a high voltage is applied across the source and drain of a device, the electric field is high, and the electrons are accelerated in the channel.