Power-on Read Circuit Voltage Control for Flash Memory
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Solution Overview
Problem
In flash memory products, the power-on reading operation often fails to accurately generate a suitable read voltage due to uncertainties in the reference voltage during the power-on process, leading to potential incorrect data reading.
Innovation Solution
A power-on read circuit comprising a power voltage detector, a first voltage booster, a voltage selector, a reference voltage generator, and a read voltage generator, which detects the power voltage, generates a control signal to select and boost voltages, ensuring accurate reference and read voltages for data reading operations, even under low power conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference voltage is generated during power-on process, then the data reading operation can be performed, but the read voltage cannot be accurately generated due to uncertain reference voltage value
Solution Approach 1:
The patent applies preliminary action by using a voltage booster to generate a boosted voltage before the reference voltage is fully stabilized during power-on. This boosted voltage is then used to generate the reference voltage, ensuring that the reference voltage reaches its target value quickly and accurately before the data reading operation begins, thereby resolving the contradiction between performing data reading and achieving accurate voltage control.
Solution Approach 2:
The patent introduces a voltage booster as an intermediary component between the power voltage and the reference voltage generator. This intermediary generates a boosted voltage that serves as an intermediate step to achieve accurate reference voltage generation during power-on, bridging the gap between uncertain initial voltage conditions and the requirement for precise reference voltage for data reading.
2Productivity
If the read voltage is generated based on uncertain reference voltage, then the power-on reading operation can proceed, but the read voltage value becomes incorrect
Solution Approach 1:
The patent applies preliminary action by generating the boosted voltage before the reference voltage is fully stabilized. This ensures that when the read voltage generator operates, both the reference voltage and the boosted voltage are already at their target values, allowing fast and accurate read voltage generation without waiting for voltage stabilization, thus resolving the contradiction between reading speed and voltage accuracy.
Solution Approach 2:
The voltage booster acts as an intermediary that provides a stable boosted voltage to the reference voltage generator and read voltage generator. This intermediary ensures that even during rapid power-on operations, the voltage generation accuracy is maintained by providing a reliable intermediate voltage level that facilitates both speed and precision in read voltage generation.
3Measurement precision
If multiple voltage boosters are used to generate reference and read voltages, then the voltage control accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the voltage booster to serve multiple functions: generating the boosted voltage for the reference voltage generator and also providing voltage for the read voltage generator. This multi-functional approach achieves accurate voltage control for both reference and read operations while minimizing the number of separate components needed, thereby reducing overall device complexity despite the added functionality.
Data Source
AI summary
A power-on read circuit includes a power voltage detector, a first voltage booster, a voltage selector, a reference voltage generator and a read voltage generator. The power voltage detector detects a power voltage to generate a control signal. The first voltage booster generates a first boosted voltage according to the control signal. The voltage selector selects the power voltage or the first boosted voltage to generate a selected voltage. The reference voltage generator receives the selected voltage as an operating power source, and generates a reference voltage based on the selected voltage according to the control signal. The read voltage generator generates a second boosted voltage according to the reference voltage and a clock signal, and generate a read voltage based on the second boosted voltage according to the control signal. The read voltage is provided to a memory cell array to perform a data reading operation.