MOSFET Level Shift Circuit With Self-Controlled Low-Power Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing level shift circuits face challenges in achieving high performance, reliability, and low power dissipation while maintaining a simplified and cost-effective design, often requiring complex control signals or high power consumption.
Innovation Solution
A level shift circuit comprising first and second voltage level transfer units and a control block circuit, utilizing NMOS and PMOS transistors to invert input signals and transfer voltage levels from one supply voltage to another, with a control block circuit generating output signals that adjust the voltage levels, thereby achieving low power dissipation and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current and resistance are used to generate voltage levels, then the level shift function is achieved, but power consumption increases and circuit complexity increases
Solution Approach 1:
The patent changes the operating parameters by using transistors in saturation and triode regions to control voltage level transfer, replacing the traditional current-resistance method. This allows the circuit to achieve level shifting through controlled transistor conduction states rather than continuous current flow, significantly reducing power dissipation while maintaining reliability
Solution Approach 2:
The patent employs dynamic control of transistor switching states to achieve level shifting. The transistors are switched between saturation and triode regions based on input signal levels, creating a dynamic response that transfers voltage levels without requiring continuous power consumption, unlike static current-resistance methods
2Reliability
If four control signals are generated to achieve level shifting, then the level shift function is achieved, but circuit complexity increases
Solution Approach 1:
The patent merges the functions of generating multiple control signals into a single transistor switching mechanism. By using the inherent switching behavior of transistors in response to input voltage levels, the circuit automatically generates the necessary control actions without requiring separate control signal generation circuits, thereby reducing overall circuit complexity
Solution Approach 2:
The transistor-based level shift circuit is self-controlling in that it automatically responds to input voltage levels and internally generates the appropriate output levels without external control signals. The transistors self-regulate their conduction states based on the input signals, eliminating the need for complex external control signal generation
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
The proposed solution effectively shifts voltage levels between different supply voltages with low power consumption and high reliability, ensuring efficient operation and simplified circuit design, suitable for driving audio devices.
Implementation Method 1
a first voltage level transfer unit, for transferring the voltage level of a first input signal from a first voltage level to a second voltage level and outputting a first level transferred control signal
Data Source
AI summary
In many high voltage circuits, it often needs to shift the logic voltage level to keep the circuit normal operation. In the class-D amplifier circuitry, it needs to shift the voltage level of pulse width modulation (PWM) signal to control the connecting of different power switches. In other applications, such as a driver to drive amplifier of an audio device, it also needs a level shift circuit to maintain the circuitry in normal voltage operation. Therefore, this invention is to provide a novel level shift circuit with high performance, low cost and low power dissipation characteristics.