ABSTRACT

The degree of inversion of a transistor can be characterized by the inversion coefficient Integrated circuits. The very low power is possible in weak inversion because the supply voltage can be reduced to a very small value. The weak inversion, the channel is equipotential and the current is carried by diffusion. The weak inversion logic represents the ultimate limit of the present trend to lower the supply voltage in order to reduce the power consumption and/or to limit the electric fields in scaled-down processes. The limited drain current density available in weak inversion, the maximum frequency of operation may reach several hundred MHz for a deep submicron process. In large digital circuits, the inputs of most gates are outputs of other gates. If all gates have same fan-in and approximately same capacitive load, then they all tend to the same transition behavior.