Dual-Mode Voltage Level Shifter for Leakage-Delay Trade-Off
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Solution Overview
Problem
Conventional voltage level shifters face a trade-off between leakage currents and propagation delay, which is not optimal for high-frequency and low-power applications, especially in mobile products with complex power management schemes.
Innovation Solution
A voltage level shifter with a mode selection unit that includes switches and an additional supply voltage provider, allowing for two operating modes: a low leakage mode and a fast mode, where the latter reduces propagation delay at the cost of increased leakage current, enabling selection based on operating conditions such as bit rate or voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional voltage level shifters are used to suppress leakage currents, then leakage current suppression is improved, but propagation delay increases
Solution Approach 1:
The patent implements a dual-mode voltage level shifter that can dynamically switch between a first operating mode (optimized for low leakage current) and a second operating mode (optimized for low propagation delay). The mode selection unit detects operating conditions and automatically selects the appropriate mode, making the system adaptive rather than static. This resolves the contradiction by allowing the system to optimize for leakage suppression when needed and for speed when needed, rather than being constrained to a fixed design compromise.
Solution Approach 2:
The patent changes the operational parameters of the voltage level shifter by introducing two distinct operating modes with different characteristics. The first mode uses specific transistor configurations to minimize leakage current, while the second mode uses different configurations to minimize propagation delay. The mode selection unit changes the operational parameter (mode of operation) based on detected conditions, allowing the system to adapt to different performance requirements without hardware modification.
2Reliability
If voltage level shifters are included in high performance conditions, then voltage level translation is maintained, but overall delay increases
Solution Approach 1:
The patent makes the voltage level shifter dynamic by introducing mode selection capability. In high-performance conditions, the system detects the operating conditions and automatically switches to the second operating mode which has shorter propagation delay. This maintains the necessary voltage level translation functionality while optimizing for speed when performance is critical, thereby reducing overall delay without sacrificing reliability.
Solution Approach 2:
The patent changes the operational parameters of the voltage level shifter based on performance requirements. When high performance is needed, the system switches to a mode with optimized speed characteristics. This parameter change allows the system to maintain voltage level translation reliability while minimizing delay in performance-critical applications.
3Adaptability or versatility
If dual-mode operation is implemented, then adaptability to different operating conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-functional voltage level shifter that can operate in two different modes depending on the application requirements. The same physical circuit structure serves dual purposes: it can optimize for low leakage current or low propagation delay based on the detected operating conditions. This universality allows a single device to handle multiple operating scenarios without requiring separate circuits for each mode, thereby managing complexity while maintaining adaptability.
Solution Approach 2:
The patent incorporates a mode selection unit that detects operating conditions and provides feedback to control which operating mode is active. This feedback mechanism allows the system to automatically adapt to changing conditions without manual intervention. The feedback loop monitors parameters such as voltage levels or operating frequency and switches modes accordingly, providing intelligent adaptability while keeping the control logic integrated within the device itself.
Data Source
AI summary
Embodiments of the present invention provide a voltage level shifter used to translate a binary input signal representing a binary sequence to a binary output signal representing the same binary sequence. The input signal is provided by an input voltage varying between a first input voltage level and a second input voltage level. The output signal is provided by an output voltage varying between a first output voltage level and a second output voltage level. The output signal has a delay relative to the input signal, and the voltage level shifter has a leakage current. The voltage level shifter has a first operating mode and a second operating mode. In the second operating mode, the delay is shorter while the leakage current is higher than in the first operating mode.