Adaptive Voltage Input for Charge Pump Efficiency
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Solution Overview
Problem
The inefficiency of charge pumps in memory devices, particularly in DRAMs, due to the need for higher voltages for data storage and access, leads to significant power consumption, even with standardized input voltages like 2.5 V, as they must step up voltages from lower levels used in other electronic components.
Innovation Solution
An adaptive voltage regulation system that provides a voltage based on the power profile of the memory device, allowing the charge pump to operate at a higher efficiency by setting the input voltage closer to the target voltage needed for memory operations, reducing the workload and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the input voltage to the memory device is standardized at 2.5 V, then the voltage level is reduced compared to traditional higher voltages, but the charge pump efficiency deteriorates significantly
Solution Approach 1:
The patent implements dynamic voltage adjustment by detecting the operational state of the memory device and adaptively changing the input voltage level. The system transitions from a static standardized voltage (2.5V) to a dynamic voltage supply that can be adjusted in real-time based on memory device requirements, thereby optimizing charge pump efficiency while maintaining compatibility with standard voltage levels.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on memory device operational state. By detecting whether the memory device is in active or idle state and adjusting the input voltage accordingly (higher voltage during active operations, lower voltage during idle periods), the system resolves the contradiction between maintaining standard voltage levels and preserving charge pump efficiency.
2Power
If the charge pump steps up voltage from 2.5 V to higher levels for memory operations, then the required voltage for data storage and access is achieved, but power consumption increases due to the voltage stepping process
Solution Approach 1:
The patent applies preliminary action by pre-charging capacitors to the required voltage levels before memory operations begin. The system detects upcoming memory operations and prepares the necessary voltage levels in advance, reducing the workload on the charge pump during actual operations and thereby lowering overall power consumption.
Solution Approach 2:
The patent replaces the mechanical charge pump voltage stepping process with an electrical capacitor-based voltage supply system. By using capacitors to store and supply voltage directly to the memory device, the system eliminates or reduces the need for continuous charge pump operation, significantly reducing power consumption while maintaining the required voltage levels for memory operations.
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 results in approximately 10% overall power savings, translating to longer battery life in mobile devices and reduced system power consumption by optimizing voltage levels for specific memory device characteristics.
Implementation Method 1
a charge pump to increase the input voltage from the first voltage level to the second voltage level
Implementation Method 2
an adaptive voltage supply to provide the first voltage level based on a power profile of the memory device
Data Source
AI summary
A memory subsystem includes an adaptive output voltage to provide a voltage based on a power profile of a memory device of the memory subsystem. A charge pump increases the voltage to a level needed to write data to the memory device. The voltage provided is based on the power profile of the memory device, which indicates a voltage level that provides good efficiency for the charge pump, and is within maximum levels for the memory device. The voltage can be higher than a nominal voltage indicated for the memory device in a specification.