Bulk Voltage Detector Sensitivity Skew Trade-off
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Solution Overview
Problem
Semiconductor memory devices face a trade-off between detector sensitivity and voltage skew in bulk voltage detection, where high sensitivity increases skew, affecting cell data retention and refresh characteristics.
Innovation Solution
A bulk voltage detector with a voltage sensor and amplifier configuration, including a voltage gain adjusting unit, to enhance sensitivity while minimizing skew through controlled voltage gain and operation in a saturation area, effectively compensating for PVT fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity of the detector is increased, then the ability to sense minute changes in bulk voltage is improved, but the skew of the bulk voltage increases
Solution Approach 1:
The patent applies parameter changes by adjusting the voltage gain within a predetermined voltage range around the target level. The voltage sensor is designed to provide increased voltage gain specifically in this range, allowing the detector to maintain high sensitivity for detecting minute voltage changes while controlling the overall skew through targeted gain adjustment rather than uniform amplification across all voltage levels.
Solution Approach 2:
The invention implements local quality by making the voltage gain characteristic location-dependent. The voltage sensor provides enhanced voltage gain specifically within a predetermined voltage range around the target level, rather than uniform gain across all operating conditions. This localized gain enhancement allows high sensitivity where needed while maintaining stability elsewhere, resolving the contradiction between sensitivity and skew.
2Measurement precision
If the voltage gain is increased to improve sensitivity, then the detection capability is enhanced, but the skew of voltage level increases
Solution Approach 1:
The patent changes the voltage gain parameter dynamically based on the operating voltage range. The voltage sensor is designed to provide increased voltage gain only within a predetermined voltage range around the target level, rather than maintaining high gain across all voltage levels. This selective parameter adjustment enhances detection capability where needed while minimizing the impact on voltage level skew.
3Stability of the object's composition
If PVT fluctuations are compensated, then the stability of bulk voltage is improved, but the complexity of the detection circuit increases
Solution Approach 1:
The voltage sensor is designed to automatically provide increased voltage gain within the predetermined voltage range around the target level without requiring external control circuitry. The circuit self-adjusts its gain characteristic based on the operating conditions, compensating for PVT fluctuations inherently through its design rather than through additional active compensation mechanisms, thereby maintaining stability while limiting complexity increase.
Data Source
AI summary
A bulk voltage detector comprises a voltage sensor configured to receive a bulk voltage and compare the received bulk voltage with a target level to provide a first detection signal having a voltage gain that is increased within a predetermined voltage range around the target level, and an amplifier coupled with the voltage sensor, the amplifier configured to receive the first detection signal and invert and amplify the first detection signal.