Midpoint-Well Resistor Layout for Stable IC Resistance
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Solution Overview
Problem
Resistance values in semiconductor integrated circuit resistors change significantly with applied voltage due to voltage modulation, affecting the accuracy of applications that require precise resistance values.
Innovation Solution
A resistor configuration comprising two equal resistance elements connected in series, with their respective wells connected to a midpoint node, effectively reducing the influence of voltage modulation by applying a midpoint voltage to each well, thereby maintaining a constant resistance value regardless of the power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional resistor is used in a semiconductor integrated circuit, then the circuit can be manufactured with standard processes, but the resistance value changes significantly with applied voltage due to voltage modulation
Solution Approach 1:
The resistor is divided into two equal resistance elements connected in series, with their respective wells connected to a midpoint node. This segmentation allows each element to experience reduced voltage stress, suppressing voltage modulation effects and maintaining constant resistance value regardless of power supply voltage variations
Solution Approach 2:
A midpoint node is introduced as an intermediary connection between the two resistance elements. This midpoint node serves as a reference potential that stabilizes the voltage distribution across each resistance element, thereby reducing the influence of voltage modulation on the overall resistance value
Data Source
AI summary
A semiconductor integrated circuit includes a first resistor formed on a semiconductor substrate, wherein the first resistor includes a first resistor element and a second resistor element, which are connected in series and have a same resistance value, and wherein a well in which the first resistor element is formed and a well in which the second resistor element is formed are connected to a connection node between the first resistor element and the second resistor element.