Isolated Level Shifter Circuit for High-Voltage Domain Transfer
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Solution Overview
Problem
Conventional level shifting logic is inefficient and unable to withstand higher operating voltages due to technological scaling, making it inadequate for modern applications.
Innovation Solution
The implementation of a level shifting architecture with first transistors configured to receive isolation control signals in a low voltage domain and provide output signals in a high voltage domain, along with isolation logic circuitry that includes control passgates to enable data input signal propagation, allowing the architecture to operate efficiently across voltage domains without a DC path during isolation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional level shifting logic is used, then the circuit design is simple, but it cannot withstand higher operating voltages and is inefficient in various functional modes
Solution Approach 1:
The level shifter is divided into multiple independent functional blocks: a first logic block operating at a first voltage domain, a second logic block operating at a second voltage domain, and isolation logic blocks between them. Each block can be independently designed and optimized for its specific voltage domain, allowing the overall system to withstand higher operating voltages while maintaining manageable complexity through modular design.
Solution Approach 2:
Isolation logic blocks are introduced as intermediary elements between the first and second logic blocks. These isolation blocks contain control passgates that mediate signal transmission between different voltage domains, enabling high voltage operation in the second logic block while protecting the first logic block from voltage stress, thus resolving the contradiction between withstanding high voltages and maintaining circuit simplicity.
2Productivity
If conventional level shifting logic is used, then the circuit structure is simple, but it is inefficient in various functional modes
Solution Approach 1:
The isolation logic blocks contain control passgates that can dynamically switch between different states (conducting and blocking) based on control signals. This dynamic control allows the level shifter to efficiently operate in various functional modes by enabling or disabling signal transmission between voltage domains as needed, improving productivity while the modular structure keeps complexity manageable.
Solution Approach 2:
The level shifter design with isolation logic blocks and control passgates provides multi-functionality by enabling operation in different functional modes (e.g., normal operation mode, isolation mode, high voltage mode). The same structural framework can adapt to various operational requirements, improving productivity across different applications without requiring completely different circuit designs for each mode.
3Adaptability or versatility
If isolation logic with control passgates is added, then the circuit can operate efficiently across voltage domains, but the device complexity increases
Solution Approach 1:
The addition of isolation logic with control passgates is achieved through segmentation - dividing the circuit into distinct voltage domains (first logic block, second logic block) separated by isolation blocks. Each segment handles a specific voltage domain, allowing efficient operation across different voltages while the segmented structure itself manages the complexity by localizing the isolation logic to specific interfaces rather than throughout the entire circuit.
Data Source
AI summary
Various implementations described herein are related to a device having level shifter circuitry configured to receive isolation control signals in a first voltage domain and provide an output signal in a second voltage domain that is different than the first voltage domain. The device may include isolation logic circuitry configured to receive a data input signal in the first voltage domain and then provide the isolation control signals to the level shifter circuitry in the first voltage domain based on the data input signal. The isolation logic circuitry may include control passgates that enable the data input signal to propagate to the level shifter circuitry via the isolation control signals.