Charge Pump Feedback Control for Voltage Drift During Ramp-Up
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Solution Overview
Problem
Conventional systems face issues with parasitic capacitances causing positive and negative voltages generated by charge pumps to drift towards each other, leading to reduced voltage fidelity, especially during transient ramp-up stages, which can result in operational failures of memory circuits.
Innovation Solution
A voltage supply circuit with a control stage that compares negative and positive voltages to a reference voltage, inhibiting the rise of one voltage when the other exceeds the reference, thereby mitigating the pull effect and maintaining voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If charge pumps independently generate positive and negative voltages, then the voltage generation speed is fast, but parasitic capacitances cause voltage drift towards each other reducing voltage fidelity
Solution Approach 1:
The patent implements feedback control by monitoring the actual positive and negative voltages generated by the charge pumps and comparing them against desired voltage levels. The control circuit adjusts the charge pump operation based on the voltage differences, preventing drift towards each other while maintaining fast generation speed. This closed-loop feedback mechanism ensures voltage fidelity is maintained during transient ramp-up stages.
Solution Approach 2:
The patent applies preliminary action by proactively controlling the charge pump operation before significant voltage drift occurs. The control circuit anticipates potential drift issues during transient stages and adjusts the charging process in advance, preventing the parasitic capacitance effects from causing fidelity problems rather than correcting them after they occur.
2Productivity
If charge pumps operate independently to generate voltages quickly, then productivity is high, but voltage drift occurs during transient ramp-up stages causing operational failures
Solution Approach 1:
The feedback control mechanism continuously monitors voltage levels during the transient ramp-up stage and adjusts charge pump operation to prevent drift. This ensures that the high productivity of independent charge pump operation is maintained while eliminating reliability issues caused by voltage drift during critical transient periods.
Solution Approach 2:
The control circuit applies preliminary anti-action by implementing control measures before voltage drift can cause operational failures. During transient ramp-up stages, the control system proactively counteracts the parasitic capacitance effects that would otherwise lead to reliability problems, allowing fast voltage generation to continue without failure risks.
3Stability of the object's composition
If control stage monitors both positive and negative voltages, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions for positive and negative voltage monitoring into a single integrated control stage. This unified approach maintains comprehensive voltage stability through dual monitoring while reducing overall device complexity by sharing control resources and infrastructure between the two voltage rails.
Solution Approach 2:
The control stage is designed with multi-functionality, serving both positive and negative voltage monitoring and regulation purposes. This universal control circuit performs multiple functions (monitoring, comparison, adjustment) for both voltage rails, improving voltage stability without proportionally increasing device complexity through separate dedicated circuits for each voltage.
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
The control stage effectively neutralizes the drift between positive and negative voltages, ensuring they reach their desired levels promptly, thereby preventing operational failures and maintaining voltage fidelity.
Implementation Method 1
parasitic capacitances may emerge between the voltage lines causing the positive voltage to pull the negative voltage and vice-versa
Data Source
AI summary
A voltage supply circuit and a method for controlling a voltage supply circuit are provided. The voltage supply circuit includes a positive charge pump stage that generates a positive voltage and a negative charge pump stage that generates a negative voltage. The voltage supply circuit also includes a control stage that compares a voltage representative of the negative voltage with a reference voltage and causes a slope of the positive voltage to decrease when the voltage representative of the negative voltage exceeds the reference voltage.