Polarization Circuit Control for Low-Leakage Logic Inputs
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Solution Overview
Problem
Integrated circuits (ICs) face significant challenges in reducing static power dissipation due to high leakage current, which increases with smaller transistor dimensions, and existing techniques to mitigate this often impact circuit delay and area or provide insufficient reduction.
Innovation Solution
The implementation of a polarization circuit that receives a digital input signal and a standby signal, allowing the IC to switch to a low leakage state when the standby signal is activated, thereby reducing static power dissipation by controlling the digital logic circuit's inputs to achieve the lowest gate leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If transistors with longer channel lengths and higher threshold voltages are used to reduce leakage current, then static power dissipation is reduced, but circuit delay and area increase
Solution Approach 1:
The patent applies dynamics by making the transistor channel length variable rather than fixed. The channel length is dynamically adjusted based on the operating state: shorter channel length during active operation for high speed, and longer channel length during standby mode for low leakage current. This is achieved through specialized transistor structures and control circuits that can modify the effective channel length on-demand, resolving the contradiction between speed and power consumption.
Solution Approach 2:
The patent changes the physical parameter of channel length to control leakage current. By transitioning from a fixed channel length design to a variable channel length design, the system can optimize performance for different operating conditions. The channel length parameter is modified between active and standby states, allowing the circuit to achieve both low leakage current and acceptable circuit delay without permanently increasing area.
2Loss of energy
If transistors with longer channel lengths are used to reduce leakage current, then static power dissipation is reduced, but circuit area increases
Solution Approach 1:
The patent uses dynamic channel length adjustment to avoid permanently increasing circuit area. Instead of using long-channel transistors throughout the circuit, the system employs mechanisms that can extend the channel length only when needed (during standby mode). This dynamic approach allows the circuit to maintain a compact area while achieving low leakage current during idle periods.
Solution Approach 2:
The patent segments the channel into multiple controllable sections that can be independently adjusted. By dividing the channel length into segments that can be selectively activated or extended, the circuit can increase the effective channel length for leakage reduction without permanently occupying additional physical space. This segmentation allows flexible control of the channel length parameter based on operational requirements.
Data Source
AI summary
This disclosure relates to leakage current reduction in integrated circuits (ICs). In one aspect, an IC can include a digital logic circuit and a polarization circuit. The digital logic circuit can have a plurality of inputs and can include a plurality of logic gates. The polarization circuit can receive a standby signal and a digital input signal comprising a plurality of bits. When the standby signal is deactivated, the polarization circuit can control the plurality of inputs of the digital logic circuit based on the digital input signal. However, when the standby signal is activated the polarization circuit can control the plurality of inputs of the digital logic circuit to a low power state associated with a smaller leakage current of the plurality of logic gates relative to at least one other state of the digital logic circuit.