Level Shifter With Adjusting Circuits For Low Voltage Operation
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Solution Overview
Problem
Existing semiconductor level shifters face limitations in circuit dimension and reliability due to thick gate oxides, and they struggle to operate efficiently at low voltages required by high-speed semiconductor memory devices, especially in terms of power consumption and noise.
Innovation Solution
A level shifter design incorporating a current mirror, multiple adjusting circuits, and switching elements with thin gate oxide transistors, which adjusts voltage levels using bias and compensation voltages to maintain node voltage differences and prevent leakage currents, allowing operation at lower voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick gate oxides are used in transistors for level shifters, then reliability is improved, but circuit dimensions increase and operation speed decreases
Solution Approach 1:
The patent changes the gate oxide thickness parameter from thick to thin to reduce circuit dimensions while maintaining reliability through voltage level adjustment mechanisms. The thin gate oxide enables smaller transistor dimensions while the level shifter compensates for potential reliability issues through controlled voltage translation.
Solution Approach 2:
The level shifter acts as an intermediary circuit between different voltage domains, using adjustable voltage levels to bridge the gap between low-voltage memory devices and higher-voltage control circuits, enabling reliable operation without requiring thick gate oxides in all circuits.
2Reliability
If thick gate oxides are used in transistors for level shifters, then reliability is improved, but operation speed decreases
Solution Approach 1:
The patent changes the gate oxide thickness to thin to increase operation speed while maintaining reliability through the level shifter's voltage adjustment capability. The thin gate oxide reduces transistor delay, and the level shifter ensures reliable voltage translation between domains.
3Use of energy by moving object
If low operation voltage is used for high-speed memory devices, then power consumption is reduced, but level shifter reliability deteriorates
Solution Approach 1:
The level shifter uses dynamic voltage adjustment through adjustable circuits that can adapt voltage levels in real-time. This allows the system to maintain reliable operation at low voltages by dynamically optimizing the voltage translation ratio based on operating conditions.
Solution Approach 2:
The level shifter incorporates feedback mechanisms through adjustable circuits that monitor and respond to voltage levels, ensuring reliable operation by compensating for voltage drops and maintaining appropriate voltage margins even at low operating voltages.
4Object-affected harmful factors
If low operation voltage is used for high-speed memory devices, then noise is reduced, but level shifter reliability deteriorates
Solution Approach 1:
The adjustable voltage circuits dynamically adapt to low-voltage operating conditions, optimizing the voltage translation ratio to maintain sufficient noise margins and signal integrity even when operating at reduced voltage levels for lower noise.
Data Source
AI summary
A level shifter includes a current mirror configured to receive an input signal in response to a first power voltage and generate an output signal by mirroring a current corresponding to a second power voltage based on a level of the input signal, a first adjusting circuit coupled to an output terminal of the current mirror and configured to adjust a voltage level of the output terminal of the current mirror in response to a bias voltage, and a second adjusting circuit coupled to a power voltage terminal which receives the second power voltage in parallel to the current mirror and configured to adjust the voltage level of the output terminal of the current mirror.