Flip-Flop Using Mixed Threshold Voltage MOS Devices
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Solution Overview
Problem
Conventional flip-flop designs face a trade-off between power efficiency and performance, with standard threshold voltage MOS devices offering better speed but higher leakage current, and high threshold voltage MOS devices reducing leakage but decreasing speed, necessitating an optimization that balances both factors.
Innovation Solution
An optimized flip-flop circuit is designed by strategically combining standard threshold voltage (SVT) and high threshold voltage (HVT) MOS devices, where SVT devices are used in critical paths for maximum speed and HVT devices are used in non-critical paths to minimize leakage without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard threshold voltage MOS devices are used, then speed performance is improved, but leakage current increases
Solution Approach 1:
The patent applies local quality by assigning different threshold voltage characteristics to different transistors within the flip-flop circuit. Specifically, the first and second transistors (forming the cross-coupled inverter pair) use standard threshold voltage for high speed, while the third and fourth transistors (controlling the set and reset paths) use high threshold voltage to minimize leakage. This localized differentiation resolves the contradiction by optimizing each transistor's threshold voltage according to its specific functional requirements within the circuit.
2Loss of energy
If high threshold voltage MOS devices are used, then leakage current is reduced, but speed performance decreases
Solution Approach 1:
The patent applies local quality by assigning different threshold voltage characteristics to different transistors within the flip-flop circuit. Specifically, the first and second transistors (forming the cross-coupled inverter pair) use standard threshold voltage for high speed, while the third and fourth transistors (controlling the set and reset paths) use high threshold voltage to minimize leakage. This localized differentiation resolves the contradiction by optimizing each transistor's threshold voltage according to its specific functional requirements within the circuit.
3Productivity
If standard threshold voltage MOS devices are used, then performance is improved, but power efficiency worsens
Solution Approach 1:
The patent applies local quality by assigning different threshold voltage characteristics to different transistors within the flip-flop circuit. Specifically, the first and second transistors (forming the cross-coupled inverter pair) use standard threshold voltage for high speed, while the third and fourth transistors (controlling the set and reset paths) use high threshold voltage to minimize leakage. This localized differentiation resolves the contradiction by optimizing each transistor's threshold voltage according to its specific functional requirements within the circuit.
Data Source
AI summary
A flip-flop operating with standard threshold voltage MOS devices as compared with high threshold voltage MOS devices may have improved speed performance, but greater leakage current. Likewise, a flip-flop operating with high threshold voltage MOS devices may reduce the leakage current and have better power efficiency, but decreased speed and performance. An optimized flip-flop may include a combination of standard threshold voltage MOS devices and high threshold voltage MOS devices. The optimized flip-flop may have less leakage during stand-by mode as compared to a flip-flop with standard threshold voltage MOS devices. In addition, the optimized flip-flop may have better performance and speed as compared to a flip-flop with high threshold voltage MOS devices.