Semiconductor Memory Input Circuit Frequency Control for Testing Efficiency
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Solution Overview
Problem
The limited number of high frequency channels in testing equipment restricts the simultaneous testing of semiconductor memory apparatus, leading to reduced testing efficiency, as most conventional high-speed memory devices require high frequency channels for operation.
Innovation Solution
An input circuit for semiconductor memory apparatus that utilizes a first and second frequency control unit to generate higher frequency signals from low frequency signals when a test mode is activated, allowing high-frequency testing through low-frequency channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high frequency channels are used for testing semiconductor memory apparatus, then high speed operation testing can be performed, but the number of apparatus that can be tested simultaneously is limited
Solution Approach 1:
The patent changes the frequency parameter of the input signals by using frequency control units that can generate higher frequency signals from lower frequency input signals. This allows the system to use low frequency channels for high frequency testing, resolving the contradiction between testing speed and testing efficiency
Solution Approach 2:
The patent makes low frequency channels capable of performing high frequency testing functions by introducing frequency control units. This multi-functionality allows the same channel infrastructure to support both low frequency operations and high frequency testing, increasing the number of apparatus that can be tested simultaneously
2Productivity
If the number of high frequency channels is increased, then more apparatus can be tested simultaneously, but the complexity and cost of testing equipment increases
Solution Approach 1:
Instead of increasing the number of high frequency channels, the patent changes the frequency characteristic of the available low frequency channels through frequency control units. This approach improves testing efficiency without requiring additional high frequency channel infrastructure
Solution Approach 2:
The frequency control units act as intermediary devices that convert low frequency input signals into high frequency signals. This intermediary mechanism allows low frequency channels to serve high frequency testing purposes, avoiding the need to expand high frequency channel capacity
Data Source
AI summary
An input circuit of a semiconductor memory apparatus includes a first frequency control unit which receives a first signal and a second frequency control unit which receives a second signal. The first frequency control unit outputs the first signal to the second frequency control unit in response to a test mode signal and generates a third signal which has a frequency higher than the frequencies of the first and second signals by using the first and second signals. Also, the second frequency control unit outputs the second signal to the first frequency control unit in response to the test mode signal and generates a fourth signal which has a frequency higher than the frequencies of the first and second signals by using the first and second signals.