Process Information Extractor Circuit for Integrated Circuits
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Solution Overview
Problem
In highly integrated circuits employing low voltages and short transistor channels, precise determination of process information is challenging due to PVT variations.
Innovation Solution
A process information extractor circuit is designed with a transistor array, current sources, comparators, and code generators to adjust the number of transistors in series based on gate voltage comparisons with reference voltages, allowing for precise measurement of process information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If highly integrated circuits employ low voltages and short transistor channels to increase integration density, then productivity and integration density are improved, but measurement precision of process information deteriorates due to PVT variations
Solution Approach 1:
The circuit is segmented into multiple identical transistor units arranged in series, with each unit contributing to the overall voltage measurement. By dividing the measurement function across multiple segments, the circuit achieves accurate process information extraction despite PVT variations affecting individual transistors.
Solution Approach 2:
The invention changes the measurement parameter from direct current measurement to voltage measurement across series-connected transistors. This parameter transformation enables process information extraction that is less sensitive to PVT variations, as the voltage-based measurement approach compensates for process variations through the series configuration.
2Measurement precision
If the number of transistors electrically coupled in series is increased to improve measurement precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The transistor array uses identical or homogeneous transistor units repeated in series. This homogeneity simplifies the design and analysis while achieving the desired measurement precision, as each unit contributes equally to the overall voltage measurement and the system behavior becomes predictable and scalable.
Solution Approach 2:
The series-connected transistor array serves multiple functions: it acts as both the measurement sensing element and the process information extraction mechanism. The same transistor units that are part of the normal circuit operation also provide the measurement function, eliminating the need for separate dedicated measurement components.
3Reliability
If current sources are used to adjust current flow through transistor arrays to maintain predetermined values despite PVT variations, then reliability is improved, but device complexity increases
Solution Approach 1:
The circuit uses self-service mechanisms where the series-connected transistor array inherently compensates for PVT variations through its configuration. The voltage measurement approach automatically adapts to process variations without requiring external active compensation circuits, as the series connection naturally provides the necessary stability.
Solution Approach 2:
The invention implements a feedback mechanism where the voltage measurement result is used to determine process information, which then informs adjustments to the transistor array configuration. This feedback loop enables the system to adapt to PVT variations and maintain reliable measurements through dynamic reconfiguration rather than static compensation circuits.
Data Source
AI summary
A process information extractor circuit includes: a transistor array including a plurality of transistors, and configured such that, among the plurality of transistors, the number of transistors electrically coupled in series is adjusted depending on a code; a current source suitable for adjusting the amount of current flowing through the transistor array to a predetermined value; a comparator suitable for comparing a gate voltage of the transistors electrically coupled in series in the transistor array, with a reference voltage; and a code generator suitable for generating the code according to a comparison result of the comparator.