Embedded-Logic Level Shifter With Dummy Transistor Symmetry
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Solution Overview
Problem
Integrated circuits face challenges in managing power consumption, particularly as the number of transistors increases and operating frequency rises, leading to thermal management issues and reduced battery life in battery-powered devices. Existing level shifting techniques can result in inaccurate signal transmission when supply voltage is reduced, causing performance issues and potential damage to memory circuits.
Innovation Solution
A level shifter circuit with a shift stage that embeds transistors for logic operations and includes dummy transistors to improve symmetry, allowing for efficient voltage level shifting between different power domains, ensuring accurate signal transmission even when the supply voltage is powered down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the supply voltage is reduced to lower power consumption, then power consumption decreases, but signal transmission accuracy deteriorates and circuits may malfunction
Solution Approach 1:
The integrated circuit is divided into multiple voltage domains, each with its own supply voltage level. This segmentation allows different parts of the circuit to operate at different voltages, enabling low-voltage operation in some domains while maintaining high-voltage operation in others, thus resolving the contradiction between power consumption and signal accuracy
Solution Approach 2:
Level shifters are introduced as intermediary components between voltage domains of different levels. These level shifters accurately translate signals from one voltage domain to another, ensuring signal transmission accuracy even when supply voltages are reduced or differ between domains
2Duration of action of moving object
If the supply voltage is reduced to extend battery life, then battery life increases, but circuit performance and thermal management improve
Solution Approach 1:
By segmenting the circuit into voltage domains, critical performance-circuitry can operate at higher voltages for peak performance when needed, while non-critical circuits operate at lower voltages to extend battery life, resolving the contradiction between battery life and circuit performance
Solution Approach 2:
The voltage domains can be dynamically adjusted based on operational requirements. When peak performance is needed, voltage can be increased in specific domains; when battery life is prioritized, voltage can be reduced. This dynamic adjustment resolves the contradiction between battery life and circuit performance
3Adaptability or versatility
If voltage domains are introduced to manage power, then power management flexibility improves, but device complexity increases due to level shifting requirements
Solution Approach 1:
The level shifter design uses standardized, modular components that can be reused across multiple voltage domain interfaces. This universal approach reduces the overall complexity burden despite the need for multiple level shifters, resolving the contradiction between power management flexibility and device complexity
Data Source
AI summary
In one embodiment, a level shifter circuit may include a shift stage that also embeds transistors that implement a logic operation on two or more inputs to the level shifter. At least one of the inputs may be sourced from circuitry that is powered by a different power supply than the level shifter and circuitry that receives the level shifter output. Additionally, the level shifter includes one or more dummy transistors that match transistors the perform the logic operation, to improve symmetry of the level shifter circuit. In some embodiments, certain design and layout rules may be applied to the level shifter circuit to limit variation in the symmetry over various manufacturing variations.