Diode-Connected Head Switch Transistor for Low-Power Light-Sleep Mode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits face challenges in efficiently managing power consumption across different operating modes, particularly in transitioning between active and light-sleep modes, as existing technologies either consume excessive switching power or experience delays due to transistor threshold voltage drops.
Innovation Solution
The implementation of selectively diode-connected head switch transistors that switch between diode-connected and non-diode-connected states during light-sleep and active modes, respectively, to reduce power consumption and minimize transition delays by introducing a transistor threshold voltage drop only during light-sleep mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If head switch transistors are switched off during light-sleep mode to power down the memory, then power consumption is reduced, but transition time to active mode increases
Solution Approach 1:
The patent applies dynamics by making the head switch transistors configurable between different operational states (fully on, diode-connected, or off) depending on the operating mode. During light-sleep mode, the transistors are switched to diode-connected state rather than fully off, enabling a compromise between power reduction and fast wake-up capability. This dynamic reconfiguration allows the system to adapt transistor behavior to meet different operational requirements.
Solution Approach 2:
The patent changes the electrical parameters of the head switch transistors by altering their connection configuration. By switching the transistors to diode-connected mode during light-sleep mode, the voltage-drop parameter is controlled to be minimal (approximately one threshold voltage) rather than the full voltage drop that would occur if the transistors were completely off. This parameter change enables both power reduction and maintained performance.
2Loss of energy
If diode-connected transistors are used during light-sleep mode to reduce leakage currents, then power consumption decreases, but voltage drop increases
Solution Approach 1:
The patent applies local quality by selectively applying the diode-connected configuration only to the head switch transistors during light-sleep mode, while other parts of the circuit maintain their normal operation. This localized approach ensures that the voltage drop is confined to specific nodes where it is acceptable, while other parts of the circuit continue to operate at full voltage. The selective application of diode-connection to specific transistors allows power reduction without compromising overall circuit performance.
3Loss of energy
If memory power supply voltage is reduced during light-sleep mode, then leakage currents are reduced, but memory speed decreases
Solution Approach 1:
The patent uses dynamics by enabling rapid switching between different voltage supply configurations. During light-sleep mode, the memory can operate at reduced voltage through diode-connected transistors, but can quickly transition back to full voltage for active mode operation. This dynamic voltage scaling allows the system to optimize power consumption during idle periods while maintaining the capability for high-speed operation when needed, without being permanently constrained to lower speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces leakage currents and power consumption during light-sleep mode while enabling quicker transitions to active mode by maintaining minimal voltage drop during normal operation, thus optimizing power management in integrated circuits.
Implementation Method 1
The diode-connected transistors lower the memory power supply voltage by a threshold voltage drop
Data Source
AI summary
A circuit is provided with a selectively diode-connected head switch transistor. During a light-sleep mode, the head switch transistor is diode connected so that a power supply voltage passing through the diode-connected head switch transistor is reduced by a transistor threshold voltage drop. During an active mode, the diode connection is opened so that the head switch transistor passes a power supply voltage with virtually no voltage drop.