Design method suitable for near-threshold and sub-threshold low electric leakage standard cell

Abstract

The invention discloses a design method suitable for a near-threshold and sub-threshold low electric leakage standard cell, and belongs to the technical field of digital integrated circuits. The design method comprises selecting standard devices of predetermined dimensions to build an inverter and calculating N / P electric leakage ratios of the standard devices; building a standard cell circuit and dividing leakage current and time delay of the standard cell circuit from sources thereof, calculating and obtaining N / P electric leakage coefficient ratios and N / P time delay coefficient ratios of the standard cell circuit, and therefore obtaining the optimal N / P electric leakage ratio of the standard cell circuit with minimum electric leakage energy consumption; and calculating adjusting parameters according to the N / P electric leakage ratios of the standard devices and the optimal N / P electric leakage ratio of the standard cell circuit, designing dimensions according to the adjusting parameters, and obtaining the optimal dimensions of NMOS transistors and PMOS transistors forming the standard cell circuit when the electric leakage energy consumption is minimum. The standard cell designed according to the method has low electric leakage characteristics, and therefore low-power digital circuits can be designed.

Description

technical field [0001] The invention relates to the technical field of digital integrated circuits, in particular to a design method for low-leakage standard cells suitable for near-threshold and sub-threshold. Background technique [0002] Digital integrated circuit semi-custom design is divided into two types based on standard cell library and gate array. Digital integrated circuit design based on standard cell refers to realizing the required circuit design by reusing the standard cells in the digital standard cell library. , the standard cell library contains basic logic units and some functional units required in circuit design, such as basic gate circuits, multi-way switches, flip-flops, full adders, encoders, etc. The standard cell library is designed and realized through the full custom design method according to the principle of the best design. It has been designed before the specific circuit design, which greatly reduces the cost and cycle of circuit design. But ...

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Problems solved by technology

[0009] It can be seen that the delay is inversely proportional to the leakage current, and has a negative exponential relationship with the voltage, so as the power supply voltage drops, the delay increases rapidly, and the leakage energy consumption will instead increase and even lead to an increase in total energy consumption.

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