Integrated Circuit Capacitance Testing via Ratio Comparison
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Solution Overview
Problem
Existing techniques for testing the capacity size of a capacitance element on a semiconductor substrate require a separate capacitance element for testing, leading to increased substrate area and inefficiency.
Innovation Solution
An integrated circuit design that incorporates both the capacitance element to be tested and a test circuit on the same semiconductor substrate, where one end of the capacitance element is held at a predetermined voltage, and the test circuit compares the voltage of the input node with a reference voltage to determine the capacity size based on the capacitance ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate capacitance element for testing is provided on the semiconductor substrate, then testing can be performed, but the substrate area is increased
Solution Approach 1:
The patent merges the capacitance element to be tested with the test circuit into a single integrated structure on the same semiconductor substrate. The capacitance element serves dual purposes: as part of the normal circuit functionality and as the test target, eliminating the need for separate dedicated test capacitance elements and thereby reducing substrate area occupation.
Solution Approach 2:
The capacitance element is designed to serve multiple functions: it operates as a functional component in the circuit while simultaneously serving as the test target for capacity size verification. This multi-functionality allows the same physical structure to fulfill both operational and testing requirements, avoiding additional area consumption.
2Measurement precision
If capacitance elements of the same capacity size are provided for testing and test target, then testing accuracy can be ensured, but device complexity increases
Solution Approach 1:
The patent utilizes parameter changes in the capacitance ratio between the capacitance element to be tested and the capacitance element in the test circuit to achieve testing. By monitoring changes in voltage based on the capacitance ratio, the system can determine capacity size accuracy without requiring duplicate capacitance elements of identical size, thereby reducing structural complexity while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient testing of capacitance elements by reducing substrate area and improving testing accuracy, enabling precise determination of capacitance within a predetermined range.
Implementation Method 1
a capacitance element for testing, and a comparison circuit for comparing a voltage of an input node with a predetermined reference voltage
Data Source
AI summary
An integrated circuit includes a capacitance element to be tested and a test circuit in the same semiconductor substrate, the test circuit includes a capacitance element for testing, and a comparison circuit for comparing a voltage of a node with a voltage of a signal, electrically connects another end of the capacitance element to be tested to the node, applies the voltage of the signal to the node in a first period, changes the voltage of the node based on a capacitance ratio of the capacitance element to be tested and the capacitance element for testing, and tests a capacity size of the capacitance element to be tested based on a comparison result of the comparison circuit in a second period after the first period.