Voltage Supply Circuit Ripple Suppression via Segmented Boosting
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Solution Overview
Problem
The existing voltage supply circuits for semiconductor storage devices, such as NAND flash memory, suffer from voltage ripples that make it difficult to reliably write data due to varying voltage values across memory cells, especially when the amplitude of these ripples is high, potentially preventing normal data writing.
Innovation Solution
A voltage supply circuit comprising a step-down circuit that reduces the power supply voltage to a constant value and a booster circuit that boosts this step-down voltage to generate an output voltage higher than the power supply voltage, thereby suppressing ripple amplitude by maintaining a constant low output current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a booster circuit directly boosts the power supply voltage to generate write voltage, then the output voltage can reach the required high value, but the output current becomes large causing high ripple amplitude that prevents reliable data writing
Solution Approach 1:
The voltage boosting process is divided into two independent stages: first the step-down circuit converts the power supply voltage to a constant step-down voltage, then the booster circuit boosts this step-down voltage to the required write voltage. This segmentation allows each circuit to operate independently with optimized parameters, preventing the ripple issues that occur when directly boosting the full power supply voltage.
Solution Approach 2:
The step-down circuit acts as an intermediary between the power supply voltage and the booster circuit. By introducing this intermediate stage that generates a constant step-down voltage, the system achieves stable write voltage with suppressed ripples, as the intermediary circuit isolates the booster from direct power supply variations.
2Temperature
If the power supply voltage is high, then the available voltage headroom is sufficient for boosting, but the output current of the booster circuit becomes large increasing ripple amplitude
Solution Approach 1:
The step-down circuit extracts only the necessary voltage level from the power supply voltage, converting it to a constant step-down voltage that is independent of the original power supply voltage magnitude. This extraction process separates the voltage headroom requirement from the current magnitude, allowing high power supply voltage to be used without proportionally increasing the booster output current and its associated ripples.
3Adaptability or versatility
If the booster circuit operates with varying power supply voltage, then it can adapt to different power conditions, but the output voltage ripple amplitude increases making it difficult to control the write voltage precisely
Solution Approach 1:
The step-down circuit performs preliminary voltage conversion before the boosting operation, establishing a constant step-down voltage as a stable foundation. This preliminary action ensures that regardless of power supply voltage variations, the booster circuit always operates from a consistent input voltage, enabling precise control of the output write voltage while maintaining adaptability to different power supply conditions.
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 solution effectively generates a voltage with suppressed ripple amplitude, independent of the power supply voltage value, ensuring reliable data writing by maintaining a consistent output current, even when the power supply voltage is high.
Implementation Method 1
a step-down circuit configured to receive a power supply voltage, step down the power supply voltage to generate a step-down voltage having a constant value lower than a value of the power supply voltage
Implementation Method 2
a booster circuit configured to boost the step-down voltage to generate an output voltage, the output voltage having a value greater than the value of the power supply voltage
Data Source
AI summary
A voltage supply circuit includes a step-down circuit configured to receive a power supply voltage, step down the power supply voltage to generate a step-down voltage having a constant value lower than a value of the power supply voltage, and a booster circuit configured to boost the step-down voltage to generate an output voltage, the output voltage having a value greater than the value of the power supply voltage.