Configurable Level-Shift Buffer for Multi-Voltage Signal Integrity
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Solution Overview
Problem
Conventional level-shifters that support various input voltage levels suffer from performance degradation due to signal rise and fall time skews, duty cycle distortion, and require additional manufacturing steps and costs.
Innovation Solution
A level-shift buffer device with an input buffer circuit, configurable circuit, and level-shift circuit that adjusts transistor operations based on configuration signals to support multiple input voltage levels, functioning as an inverter or level shifter as needed, without using metal options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metal options are used to connect level-shifter circuitry for supporting various input voltage levels, then the device can support multiple voltage levels, but signal rise and fall time skews and duty cycle distortion occur causing performance degradation
Solution Approach 1:
The patent implements dynamic configuration of the level-shifter circuitry through control signals that enable or disable specific circuit paths based on the detected input voltage level. Transistors are dynamically switched to connect or bypass the level-shifter circuitry, allowing the circuit to adapt its configuration in real-time rather than relying on fixed metal options. This dynamic approach maintains signal integrity by selecting the appropriate circuit path for each voltage level.
Solution Approach 2:
The patent changes the operational parameters of the level-shifter circuitry by detecting the input voltage level and adjusting the circuit configuration accordingly. The control logic detects whether the input voltage is at a first or second level and相应地 enables or disables the level-shifter circuitry, effectively changing the circuit's electrical parameters to match the input conditions and prevent signal degradation.
2Adaptability or versatility
If metal options are used to configure level-shifter circuitry for various voltage levels, then the device can support multiple voltage levels, but extra back-end layer metal masks are required increasing manufacturing cost and time-to-market
Solution Approach 1:
The patent designs a universal level-shifter circuit that can handle multiple voltage levels through a single standardized configuration. The same physical circuit layout and metal layers are used for all voltage level configurations, with the difference being in the logical enable/disable control of the circuit paths. This eliminates the need for separate metal options or additional back-end layer masks for different voltage levels, reducing manufacturing complexity and cost.
Solution Approach 2:
The patent uses a single standardized circuit design that can be copied and deployed for all voltage level requirements. Rather than creating different physical layouts for different voltage levels, the same circuit blueprint is used with software-controlled enablement of specific paths, eliminating the need for multiple manufacturing masks and reducing time-to-market.
3Adaptability or versatility
If conventional level-shifter design with metal options is used, then various input voltage levels can be supported, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
The patent replaces the mechanical/physical approach of using different metal layers and options for voltage level configuration with an electronic/software-based approach. Instead of physically different circuit layouts for different voltages, the same physical layout is controlled through electronic signals that enable or disable specific circuit paths, reducing manufacturing process complexity.
Data Source
AI summary
A level-shift buffer device includes an input buffer circuit, a configurable circuit and a level-shift circuit. The input buffer circuit receives input/output (I/O) supply voltage at a first voltage level among a plurality of voltage levels that are supported by the level-shift buffer device. The input buffer circuit generates a first input signal according to the first voltage level of the I/O supply voltage. The configuration circuit controls at least one transistor of the configurable circuit according to the configuration signal to generate a second input signal. The level-shift circuit generates an output signal at a second voltage level according to the second input signal and the configuration signal, wherein the level-shift circuit functions as an inverter or a level shifter in accordance with the configuration signal.