Power Switching Circuitry with Staged Transistor Activation
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Solution Overview
Problem
Conventional systems face challenges in designing components for efficient power reconnection in integrated circuits with minimal side effects, particularly in reducing heat, voltage droops, noise, and electro-migration during power switching operations.
Innovation Solution
The implementation of power switching circuitry with programmable digital codes that control the delivery of power to functional units, using transistors coupled in parallel and a resistive network to manage power supply nodes, thereby avoiding excessive heat and reducing voltage noise and electro-migration, and making the circuitry insensitive to process-voltage-temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power is quickly reconnected to functional units, then power delivery speed is improved, but heat generation and voltage droops increase
Solution Approach 1:
The power switching circuitry uses a ramped voltage signal to gradually turn on transistors in a staged, periodic manner rather than all at once. This controlled periodic activation distributes the power delivery over time, reducing instantaneous current spikes that cause heat generation and voltage droops, while still achieving relatively fast overall power reconnection.
2Device complexity
If power switching circuitry uses simple transistor control, then device complexity is reduced, but heat generation and voltage noise increase
Solution Approach 1:
The circuit introduces intermediary elements including a resistive network that generates multiple voltage levels and transmission gates that selectively connect these levels to transistor gates. This intermediary structure provides controlled voltage staging without requiring complex digital control logic, reducing voltage noise while maintaining relatively simple overall device complexity.
3Productivity
If transistors are turned on simultaneously, then power delivery efficiency is improved, but electro-migration and voltage droops worsen
Solution Approach 1:
The power switching circuitry segments the transistor activation process by dividing transistors into multiple groups that are turned on in sequential stages. The resistive network provides multiple voltage levels that correspond to different activation stages, segmenting the power delivery process to reduce instantaneous current density and prevent electro-migration, while maintaining overall power delivery efficiency through the coordinated staging.
4Ease of manufacture
If power switching circuitry lacks calibration mechanisms, then ease of manufacture is improved, but manufacturing precision and reliability worsen
Solution Approach 1:
The resistive network automatically generates the required multiple voltage levels for transistor gating without requiring external calibration or trimming circuits. The inherent physical properties of the resistive dividers provide self-adjusting voltage references that compensate for process variations, enabling easy manufacturing while maintaining power switching accuracy and reliability without post-fabrication calibration steps.
Data Source
AI summary
Some embodiments include apparatuses and methods using the apparatuses. One of the apparatuses includes a first power supply node, a second power supply node, transistors coupled in parallel between the first and second power supply nodes, and a controller to provide a first voltage, a second voltage, and a third voltage to gates of the transistors based on digital information. The first, second, and third voltages have different values based on values of the digital information.