Subthreshold swing is a critical parameter in field-effect transistors (FETs) that quantifies the gate voltage required to increase the drain current by one decade in the subthreshold region. It is a key indicator of how efficiently a transistor can switch from off to on, with lower values indicating better performance and energy efficiency in low-power applications.

Subthreshold Swing

Field-effect transistors (FETs) are semiconductor devices that control the flow of current by applying an electric field, making them essential components in modern electronics for amplifying or switching signals. Their operation is based on the modulation of charge carriers in a channel, which is controlled by a voltage applied to a gate terminal, offering high input impedance and low power consumption.

Field-effect Transistors

FETs

Gate voltage is a crucial parameter in field-effect transistors (FETs) that controls the conductivity of the channel between the source and drain terminals, effectively switching the device on or off. By modulating the gate voltage, the FET can operate in different regions, impacting its current-voltage characteristics and overall performance in electronic circuits.

Gate Voltage

Drain current is the flow of charge carriers through the channel of a field-effect transistor (FET) from the drain to the source terminal, controlled by the gate voltage. It is a fundamental parameter in determining the transistor's operating region and overall performance in electronic circuits.

Drain Current

One decade

The subthreshold region, also known as the weak inversion region, is where a MOSFET operates below the threshold voltage, allowing for exponential current-voltage characteristics that are useful for low-power applications. This region is characterized by a small current flow that is exponentially related to the gate voltage, making it critical for designing energy-efficient circuits in modern electronics.

Subthreshold Region

Indicator of performance

Energy efficiency refers to using less energy to perform the same task or produce the same outcome, thereby reducing energy waste and lowering energy costs. It is a crucial component in combating climate change and enhancing energy security by minimizing the environmental impact of energy consumption.

Concepts

Your Lessons