Subthreshold slope is a characteristic of MOSFET current-voltage characteristics. In the subthreshold region, the drain current behavior – albeit controlled by the gate terminal – resembles the exponentially decreasing current of a forward-biased diode.

What is the importance of subthreshold swing?

Subthreshold swing is Important parameters for simulating weak inversion mechanismsespecially for high gain analog applications, imaging circuits and low voltage applications.

What does subthreshold swing mean?

The subthreshold swing (S) is The figure of merit that determines the behavior of transistors in the subthreshold region. The performance of metal-oxide-semiconductor field-effect transistors (MOSFETs) is fundamentally limited by thermal voltage (kT/q), which results in a theoretical minimum of S = 60mV/decade.

What is subthreshold swing in VLSI?

The subthreshold slope is Current-Voltage Characteristics of MOSFETs…at room temperature, the typical experimental subthreshold swing for scaling MOSFETs is around 70 mV/dec, with a slight decrease due to short-channel MOSFET parasitics. One dec (frequency of ten) corresponds to a 10-fold increase in drain current ID.

How do I find my subthreshold swing?

The general expression for the subthreshold slope (swing) is S= (d(log10Ids)/dVgs)-1. Or from the graph above, in the case of very low Vgs, take the derivative of the log value of Ids with respect to Vgs, and invert the resulting value.

6.3 Subthreshold Swing

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