Source Line Voltage Adjuster for NAND Flash Power Optimization
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Solution Overview
Problem
Conventional NAND flash memory devices experience unnecessary power consumption due to a fixed current provided by the current source for the common source line, leading to inefficient power management during reading operations.
Innovation Solution
A source line voltage adjuster comprising an operation amplifier, current drainer, and current generator is used to dynamically adjust the output current on the common source line based on a bias voltage, ensuring appropriate voltage maintenance while minimizing power consumption by varying the current according to the voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed current is provided by the current source for the common source line, then the voltage on the common source line can be maintained, but unnecessary power consumption is generated
Solution Approach 1:
The patent applies dynamics by transforming the fixed current source into a dynamic current adjustment system. The operation amplifier continuously monitors the common source line voltage and adjusts the current generator's output accordingly. When voltage deviates from the reference, the amplifier dynamically modifies the current to restore proper voltage levels, eliminating the need for continuous fixed current flow and reducing power consumption while maintaining voltage stability.
Solution Approach 2:
The patent implements feedback through the operation amplifier that continuously compares the actual common source line voltage with the reference voltage. This feedback mechanism detects voltage deviations and automatically adjusts the current generator's output current to correct the voltage. The feedback loop ensures voltage maintenance only when necessary, preventing unnecessary power consumption during normal operating conditions.
2Stability of the object's composition
If a current source continuously provides current for the common source line, then voltage stability is achieved, but power waste increases
Solution Approach 1:
The patent applies self-service by enabling the common source line voltage regulation system to automatically monitor and adjust itself without external intervention. The operation amplifier detects voltage fluctuations and the current generator responds by adjusting its output current accordingly. This self-regulating mechanism maintains voltage stability only when needed, allowing the system to enter a low-power state when voltage is already stable, thereby reducing power waste while ensuring voltage stability.
3Reliability
If the current generator provides a constant output current, then the common source line voltage is maintained, but unnecessary power consumption occurs
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the current generator's output current parameter based on the actual voltage conditions. Instead of maintaining a constant current, the system adjusts the current parameter in response to voltage deviations detected by the operation amplifier. This parameter adaptation ensures voltage maintenance when necessary while reducing current flow (and thus power consumption) when voltage is already within acceptable ranges, eliminating unnecessary power waste.
Data Source
AI summary
A memory device, a source line voltage adjuster and a source line voltage adjusting method thereof are provided. The source line voltage adjuster includes an operation amplifier, a current drainer and a current generator. The operation amplifier includes a first input end coupled to a common source line and a second input end for receiving a reference voltage. The operation amplifier generates an bias voltage. The current drainer drains a drain current from the common source line according to the bias voltage. The current generator provides an output current for the common source line. The current generator generates a first current according to the bias voltage, and generates a second current according to a reference current. The current generator generates the output current according to a difference of the second current and the first current.