High-Voltage Level Shifter Circuit for Low-Voltage Robust Operation
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Solution Overview
Problem
Existing level shifters face issues with operating at low supply voltages, high power dissipation, and errors due to missed signal changes, leading to system deadlocks and static current consumption.
Innovation Solution
A novel level shifter circuit design that includes switching elements and protection transistors, with adaptive control of protection transistors based on output supply voltage and reference voltage, using control voltages generated to ensure correct operation at low voltages and protect against high gate-source voltages, and incorporating auxiliary reference potential generators and diode-connected transistors to manage threshold voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If edge sensitive level shifters are used, then signal transformation speed is improved, but reliability deteriorates due to missed input edges causing system deadlocks
Solution Approach 1:
The patent implements a dynamic level-sensitive latching mechanism that adapts its sensitivity based on the voltage domain differences. The circuit transitions from static to dynamic operation modes, allowing it to respond to both level changes and edges while maintaining robustness against missed signals through the latch's memory function.
Solution Approach 2:
The patent introduces a voltage domain interface circuit as an intermediary between different voltage domains. This interface includes protection transistors and level shifters that mediate the signal transfer, preventing direct exposure to voltage domain mismatches and eliminating the deadlock issues of edge-sensitive designs.
2Use of energy by moving object
If static level shifters without static current consumption are used, then power consumption is reduced, but adaptability deteriorates as they cannot work at low supply voltages
Solution Approach 1:
The patent employs parameter-changing techniques by dynamically adjusting the operating parameters of the protection transistors based on the supply voltage level. The circuit includes voltage-dependent control mechanisms that modify transistor gate voltages and channel characteristics to maintain proper operation across a wide voltage range from low to high supply voltages.
Solution Approach 2:
The patent transitions from static to dynamic operation by implementing voltage-domain-dependent circuit behavior. The level shifter adapts its operating mode based on the input and output voltage domains, enabling it to function efficiently at both low and high supply voltages without static current consumption in idle states.
3Reliability
If protection transistors are used to protect against high gate-source voltages, then reliability is improved, but device complexity increases due to adaptive control requirements
Solution Approach 1:
The patent implements self-service protection mechanisms where the protection transistors automatically regulate their own gate-source voltages based on the operating conditions. The circuit uses intrinsic voltage feedback and body effect modulation to self-limit the gate-source voltage across protection transistors, eliminating the need for external complex control circuits.
Solution Approach 2:
The patent incorporates voltage feedback mechanisms that monitor the gate-source voltage across protection transistors and automatically adjust control signals to maintain safe operating levels. This feedback control is integrated into the existing level shifting architecture, providing protection without requiring separate complex control circuits.
4Adaptability or versatility
If level shifters are used to interface different voltage domains, then adaptability is improved, but power dissipation increases due to static current consumption
Solution Approach 1:
The patent applies local quality optimization by implementing protection mechanisms and level shifting only where voltage domain transitions occur, rather than throughout the entire circuit. The protection transistors and level shifters are strategically placed at critical interface points, reducing overall power dissipation while maintaining voltage domain interfacing capability.
Solution Approach 2:
The patent reduces power dissipation by dynamically changing operating parameters such as transistor threshold voltages and channel widths based on the active voltage domain. The circuit adjusts its electrical characteristics to minimize leakage currents and static power consumption while maintaining proper signal level translation between different voltage domains.
Data Source
AI summary
The present document relates to a level shifter circuit configured to transform an input voltage at an input of the level shifter circuit into an output voltage at an output of the level shifter circuit. The level shifter circuit may comprise a first switching element coupled between an output supply voltage and a positive output terminal, wherein a control terminal of the first switching element is coupled to a negative output terminal. The level shifter circuit may comprise a second switching element coupled between the output supply voltage and the negative output terminal, wherein a control terminal of the second switching element is coupled to the positive output terminal. The level shifter circuit may comprise a drive circuit configured to drive the control terminals of the first and the second switching element based on the input voltage at the input of the level shifter circuit.