Signal Comparison Circuit with Attenuator for High-Speed Testing
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Solution Overview
Problem
Conventional comparison judgment circuits face limitations in high-speed signal evaluation due to the need for high-breakdown voltage components, which restricts test rate and performance in bidirectional semiconductor device testing.
Innovation Solution
A comparison judgment circuit design that includes an attenuator circuit and a level comparator configured to maintain a low input voltage level, allowing the use of high-speed comparators with low breakdown voltage components, and a protection circuit to manage overvoltage states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-breakdown voltage transistor is used in the level comparator to withstand large amplitude signals, then the reliability is improved, but the operation speed deteriorates
Solution Approach 1:
The circuit is divided into two functional segments: an attenuator circuit (first resistor and second resistor) that handles the high-voltage signal conditioning, and a level comparator that operates at low voltage for high-speed comparison. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The attenuator circuit acts as an intermediary between the high-amplitude signal source and the low-voltage level comparator. It transforms the high-voltage signal into a suitable low-voltage range, enabling the comparator to operate at optimal speed while protecting itself from overvoltage damage.
2Reliability
If a high-breakdown voltage transistor is used in the level comparator, then the reliability is improved, but the productivity deteriorates
Solution Approach 1:
The circuit is divided into two functional segments: an attenuator circuit (first resistor and second resistor) that handles the high-voltage signal conditioning, and a level comparator that operates at low voltage for high-speed comparison. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The attenuator circuit acts as an intermediary between the high-amplitude signal source and the low-voltage level comparator. It transforms the high-voltage signal into a suitable low-voltage range, enabling the comparator to operate at optimal speed while protecting itself from overvoltage damage.
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
Enables high-speed signal evaluation and improved performance by using low-breakdown voltage components while protecting the comparator from overvoltage, enhancing the test rate and reliability in semiconductor device testing.
Implementation Method 1
an attenuator circuit configured to output an attenuated voltage that occurs at a connection node that connects the first resistor and the second resistor
Data Source
AI summary
A comparison judgment circuit judges the level of a signal received, via a transmission line, from a second device which is a communication partner. An input/output terminal is connected to the transmission line. An attenuator circuit attenuates the voltage at the input/output terminal so as to generate an attenuated voltage. A level comparator compares the attenuated voltage with a predetermined threshold voltage, and generates a level judgment signal that corresponds to the comparison result. A protection circuit monitors the voltage at the input/output terminal or the attenuated voltage. When the voltage to be monitored deviates from a predetermined voltage range, the protection circuit forcibly cuts off or changes the voltage input to the level comparator.