Level Shifter Current Limiting for Sub-Threshold Operation
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Solution Overview
Problem
Level shifters fail to operate effectively at sub-threshold voltages due to leakage currents, limiting their functionality in low-power designs.
Innovation Solution
Incorporating current limiters, such as diode-connected MOSFETs, between switches in the level shifter to reduce current flow and enable voltage adjustments, allowing the level shifter to function with sub-threshold voltages by providing sufficient voltage drops and reducing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If level shifters operate at lower power voltage to reduce power consumption, then energy efficiency is improved, but leakage currents cause operational failure
Solution Approach 1:
The patent introduces a current limiter circuit as an intermediary component between the level shifter and the signal path. This current limiter acts as a mediator that controls and restricts leakage currents to acceptable levels, allowing the level shifter to operate reliably at sub-threshold voltages without being directly affected by the harmful leakage effects
2Productivity
If conventional level shifters are used at sub-threshold voltages to enable low-power operation, then power efficiency is improved, but current leakage causes operation failure
Solution Approach 1:
The patent converts the harmful leakage current effect into a beneficial control mechanism by using the current limiter circuit to deliberately introduce controlled current restrictions. The current limiter transforms the uncontrolled harmful leakage into a controlled parameter that can be managed and utilized for reliable low-power operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the level shifter to successfully operate with sub-threshold voltages by reducing current flow and maintaining effective voltage adjustments, thereby expanding its operational range and reliability in low-power applications.
Implementation Method 1
Incorporating current limiters, such as diode-connected MOSFETs, between switches in the level shifter
Implementation Method 2
Incorporating current limiters, such as diode-connected MOSFETs, between switches in the level shifter to reduce current flow
Data Source
AI summary
A device is disclosed and includes a first transistor, a second transistor, and a first current limiter. First terminals of the first and second transistors are coupled to an output terminal, and gate terminals of the first and second transistors receive a first input signal. A first terminal of the first current limiter is coupled to a second terminal of the first transistor to output a first output signal, and a second terminal of the first current limiter is coupled to a second terminal of the second transistor to output a second output signal. A third output signal at the output terminal has a logic value different from that of the first input signal.