Hybrid Charge Pump Regulation for Memory Systems
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Solution Overview
Problem
Conventional voltage generation circuits for memory systems face challenges in achieving stable and power-efficient voltage regulation, particularly in power-conscious devices like battery-powered electronics, due to high power consumption in resistive dividers and instability in capacitive dividers.
Innovation Solution
A voltage generation circuit that utilizes a hybrid feedback mechanism, selectively disabling one feedback circuit to reduce power consumption while maintaining stable voltage regulation through the other, combining resistive and capacitive divider approaches for improved efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistive divider is used for voltage regulation feedback, then voltage regulation stability is improved, but power consumption increases substantially
Solution Approach 1:
The patent dynamically switches between resistive divider feedback and capacitive divider feedback based on operating conditions. The system activates the resistive divider feedback when stability is critical and deactivates it when power savings are prioritized, making the feedback mechanism adaptive rather than static.
Solution Approach 2:
The patent changes the feedback mechanism parameter from fixed (either resistive or capacitive) to variable by introducing a controller that selects between different feedback paths. This allows the system to adjust the feedback characteristics based on power availability and stability requirements.
2Use of energy by stationary object
If a capacitive divider is used for voltage regulation feedback, then power efficiency is improved, but voltage regulation stability deteriorates due to sensitivity to process variations and parasitic effects
Solution Approach 1:
The controller acts as an intermediary that manages the interaction between the capacitive divider and resistive divider feedback paths. It determines when to rely on the power-efficient capacitive feedback and when to engage the more stable resistive feedback, mediating between the two conflicting requirements.
Solution Approach 2:
The patent segments the feedback function into two separate paths: one using capacitive division for power efficiency and another using resistive division for stability. The controller selectively activates appropriate segments based on system needs, allowing independent optimization of each path.
3Measurement precision
If both feedback circuits are activated simultaneously, then voltage regulation accuracy is improved, but power consumption increases
Solution Approach 1:
The system employs periodic evaluation of operating conditions to determine when to activate the resistive divider feedback. Rather than continuous activation, the controller periodically assesses whether stability enhancement is needed, activating the resistive path only during specific periods when beneficial.
Data Source
AI summary
Techniques for reliably and efficiently generating an output voltage for use within an electronic device, such as a memory system, are disclosed. A voltage generation circuit generates the output voltage. The voltage generation circuit includes regulation circuitry that controls regulation of the output voltage to maintain the output voltage at a substantially constant level. According to one aspect, regulation is provided through use of different feedback circuits. By selectively disabling one of the feedback circuits, power consumption can be reduced and the other of the feedback circuits can support the continued regulation of the output voltage. The voltage generation circuit is therefore able to operate in an accurate, stable and power efficient manner.