Differential Data Strobe Circuit Glitch Removal
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Solution Overview
Problem
Semiconductor memory devices face data recognition errors due to differences in transmission rates of data and clock signals, leading to glitches in data strobe signals, which can cause malfunctions, especially at higher operation frequencies.
Innovation Solution
A semiconductor memory device generates a strobe control signal based on the first and second data strobe signals to remove glitches, eliminating the need for additional delay circuits and simplifying the circuit design, thereby minimizing chip area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional delay circuits are added to synchronize data and clock signals, then data recognition accuracy is improved, but chip area and circuit complexity increase
Solution Approach 1:
The patent extracts and removes the problematic delay circuits from the system. By identifying that the delay circuits causing synchronization issues are not needed when using differential data strobe signals with complementary phases, the invention eliminates these components entirely, thereby reducing chip area and circuit complexity while maintaining data recognition accuracy through the inherent synchronization capability of the differential signaling scheme
Solution Approach 2:
The patent introduces differential data strobe signals (DQS and /DQS) as intermediary signals that mediate between the data transmission and clock synchronization functions. These complementary signals act as intermediaries that provide inherent timing reference without requiring additional delay circuits, thus resolving the contradiction between accuracy and complexity
2Measurement precision
If additional delay circuits are added to synchronize data and clock signals, then data recognition accuracy is improved, but power consumption increases
Solution Approach 1:
The patent removes the power-consuming delay circuits from the system by demonstrating they are unnecessary when using differential data strobe signals. The elimination of these static circuit components directly reduces power consumption while the differential signaling mechanism maintains accurate data recognition through its inherent timing synchronization capability
Solution Approach 2:
The differential data strobe signals perform self-synchronization without requiring external delay circuits. The complementary nature of DQS and /DQS signals provides inherent timing reference that automatically synchronizes data sampling, making the system self-sufficient and eliminating the need for additional power-consuming synchronization components
3Stability of the object's composition
If complex synchronization operations are performed, then data and clock signal synchronization is improved, but chip area increases
Solution Approach 1:
The patent extracts and eliminates complex synchronization operations and associated circuitry from the chip. By using differential data strobe signals with complementary phases, the invention removes the need for additional synchronization circuits, delay elements, and related components, thereby reducing chip area while maintaining synchronization stability through the inherent properties of differential signaling
Solution Approach 2:
The differential data strobe signals serve multiple functions simultaneously: they provide data timing reference, enable signal synchronization, and provide inherent noise immunity. This multi-functionality eliminates the need for separate synchronization circuits, reducing chip area while maintaining synchronization stability
Data Source
AI summary
A circuit for generating a data strobe signal includes: a control signal generation unit configured to generate a strobe control signal defining an activation time period where a first data strobe signal and a second data strobe signal, which is an inverted signal of the first data strobe signal, are toggled; and a strobe signal output unit configured to output the first and second data strobe signals as a final strobe signal in the activation time period where the strobe control signal is activated.