Independent-Driver Level Shifter for High-Swing Signal Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits face challenges in converting low voltage swing signals to high voltage swing signals due to the mismatch in transistor sizes and capabilities between core and I/O transistors, leading to inadequate driving capability in existing level shifting circuits.
Innovation Solution
A level shifting circuit comprising a level-shifting subcircuit and a driving circuit, where the subcircuit converts input voltage signals between power domains, and the driving circuit enhances the driving capability with controlled voltage pull-up and pull-down devices, utilizing appropriately designed transistor ratios to improve voltage level shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If core transistors are used for voltage level conversion, then the circuit occupies less die space, but the driving capability is insufficient for high voltage swing signals
Solution Approach 1:
The level shifting circuit is divided into two independent parts: a level-shifting subcircuit for voltage conversion and a driving circuit for signal enhancement. This segmentation allows each part to be optimized independently - the subcircuit uses small core transistors for compactness while the driving circuit uses large I/O transistors for high driving capability.
Solution Approach 2:
The level-shifting subcircuit acts as an intermediary between the low-voltage core domain and the high-voltage I/O domain. It converts the low-voltage swing signal to high-voltage levels, which are then amplified by the driving circuit with large I/O transistors to achieve the required driving capability for external circuits.
2Power
If I/O transistors are used for voltage level conversion, then the driving capability is sufficient for high voltage swing signals, but the circuit occupies more die space
Solution Approach 1:
The circuit is segmented into a compact level-shifting subcircuit using small core transistors and a driving circuit using large I/O transistors. This allows the majority of the circuit area to be minimized while preserving the necessary driving capability in the dedicated driving portion.
Solution Approach 2:
Different regions of the circuit have different transistor sizes optimized for their specific functions: the level-shifting subcircuit uses small transistors appropriate for voltage conversion, while the driving circuit uses large transistors appropriate for high-current drive applications.
3Use of energy by moving object
If core transistors are sized for low voltage swing, then they handle low voltage signals efficiently, but they cannot handle larger voltage swing signals
Solution Approach 1:
The circuit achieves multi-functionality by combining a level-shifting subcircuit that handles low-voltage signals efficiently with a driving circuit that handles high-voltage swing signals. This universal design allows the same circuit to process both low-voltage core signals and high-voltage I/O signals.
Solution Approach 2:
The level-shifting subcircuit serves as an intermediary that adapts low-voltage core signals to high-voltage levels, enabling them to be processed by the driving circuit with large I/O transistors. This intermediary function extends the voltage swing range while maintaining efficiency.
Data Source
AI summary
An integrated circuit is provided, which includes a level-shifting subcircuit and a driving circuit. The level-shifting subcircuit is configured to generate a first control signal within a first power domain and a second control signal within a second power domain in response to an input voltage signal. The driving circuit is configured to generate an output voltage signal within the first power domain in response to the first control signal and the second control signal. A voltage range of the first power domain differs from that of the second power domain.