Flash Memory Read Amplifier Pre-Charge for Faster Sensing
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Solution Overview
Problem
Existing flash memory read amplifiers face challenges in achieving fast reading times and efficient data retrieval due to high capacitance and lack of effective pre-charging mechanisms, which hinder the performance of sensor devices in various applications.
Innovation Solution
Incorporation of a read amplifier with a feedback circuit and pre-charge circuit that pre-charges the sense node to a predetermined value, utilizing a conditioning circuit to reduce capacitance and enhance amplification, thereby speeding up the pre-charge and sensing phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional read amplifier is used without pre-charge circuit, then the device complexity is reduced, but the reading time increases and data retrieval efficiency deteriorates
Solution Approach 1:
The pre-charge circuit charges the sense node to a predetermined voltage value before the actual sensing operation begins. This preliminary action prepares the sense node in advance, enabling faster detection of data signals from the flash memory and reducing the overall reading time without significantly increasing device complexity
2Speed
If the sense node capacitance is high, then the node can hold charge longer, but the pre-charge and sensing phases become slower
Solution Approach 1:
The pre-charge circuit performs preliminary charging of the sense node to an optimized voltage level before sensing. This allows the system to work with smaller capacitance values while maintaining adequate charge holding capability for the required measurement duration, thereby increasing the speed of pre-charge and sensing phases
Solution Approach 2:
The read amplifier operates in periodic phases: first the pre-charge phase charges the sense node, then the sensing phase detects the data signal. This periodic operation allows the system to optimize capacitance values for speed while maintaining reliability through controlled charging cycles
Data Source
AI summary
A read amplifier, comprising: a transistor having a first terminal and a second terminal, the second terminal being coupled to a sense node, the transistor being arranged to: (i) receive, on the second terminal, a data signal that is generated at least in part by a memory matrix, and (ii) output, on the sense node, an amplified data signal; and a feedback circuit arranged to generate, based at least in part on the data signal, a feedback signal that is applied at a gate of the transistor; and a pre-charge circuit that is configured to pre-charge the sense node to a predetermined value, such that, after the sense node is pre-charged, a voltage at the sense node settles at a value corresponding to the amplified data signal.