Quantizing Circuit for Multi-Bit Memory Sensing

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Solution Overview

Problem

Conventional sense amplifiers struggle to accurately read multi-bit memory elements due to noise interference and difficulty in distinguishing small voltage or current differences, leading to reduced memory density and increased costs.

Innovation Solution

A quantizing circuit that samples and filters electrical parameters to reduce noise, allowing for accurate detection of small differences in multi-bit memory elements, and a built-in self-test module to streamline testing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multi-bit memory elements are used to increase storage capacity, then memory density is improved, but the ability to accurately distinguish voltage levels deteriorates due to smaller voltage differences and noise interference

Engineering Contradiction:

Improvememory densityVSAvoidvoltage level distinction accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The sense amplifier is divided into multiple independent sense amplifiers, with each responsible for detecting a specific voltage level threshold. This segmentation allows parallel detection of multiple thresholds, improving the accuracy of multi-bit memory element reading while maintaining the ability to distinguish small voltage differences despite noise interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reference voltages are introduced as intermediary elements to facilitate accurate comparison with the memory element output. Multiple reference voltages corresponding to different threshold levels enable the sense amplifiers to accurately distinguish between multiple voltage levels by comparing against these intermediary reference points, thereby improving measurement precision without sacrificing memory density.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If conventional sense amplifiers are used to read multi-bit memory elements, then device complexity is reduced, but measurement precision deteriorates due to inability to distinguish small voltage differences

Engineering Contradiction:

Improvesense amplifier structureVSAvoidvoltage level detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The sensing function is segmented across multiple sense amplifiers, each dedicated to a specific threshold level. This segmentation approach maintains relatively simple individual amplifier structures while collectively achieving high measurement precision through parallel operation, resolving the contradiction between device complexity and measurement precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a single complex sense amplifier attempting to detect all voltage levels, the system employs multiple simpler sense amplifiers that each perform a partial function (detecting a specific threshold). This partial action approach achieves accurate multi-level detection through the combined output of multiple simple components, balancing device complexity and measurement precision.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If noise filtering is implemented to improve voltage level detection, then measurement precision is improved, but testing time increases due to additional processing requirements

Engineering Contradiction:

Improvesignal detection accuracyVSAvoidtesting time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Noise filtering and reference voltage establishment are performed as preliminary actions before the actual memory reading operation. By preparing the sensing environment and reference levels in advance, the system achieves high measurement precision during the actual read operation without adding significant time overhead, as the filtering and preparation occur in parallel with or before the critical measurement path.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The multiple sense amplifiers operate continuously and simultaneously to detect different voltage thresholds, maintaining continuous useful action throughout the reading process. This parallel continuous operation achieves high measurement precision without requiring sequential processing steps that would increase testing time, as all threshold detections occur concurrently rather than in sequence.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS8042012B2Systems and devices including memory with built-in self test and methods of making and using the same

Publication Date: 2011.10.18 MICRON TECHNOLOGY INC

AI summary

Disclosed are methods, systems and devices, such as a device including a data location, a quantizing circuit coupled to the data location, and a test module coupled to the quantizing circuit. The quantizing circuit may include an analog-to-digital converter, a switch coupled to the memory element and a feedback signal path coupled to the output of the analog-to-digital converter and to the switch.