Signal Generation Circuit for Stable Alert Pulse Widths
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Solution Overview
Problem
In semiconductor memory manufacturing, variations in process corners due to differences in transistor parameters across wafers cause inconsistencies in clock signal cycles, leading to errors in pulse width of alert signals, which can exceed or fall below specified standards.
Innovation Solution
A signal generation circuit that includes a clock module, a control module, and a generation module, where the control signal's trend opposes the cycle change of the clock signal, stabilizing the target duration and pulse width of the target signal, thereby maintaining it within a specified range across different process corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed cycle clock signal is used, then the circuit design is simple, but the pulse width of alert signals varies due to process corner differences
Solution Approach 1:
The patent applies dynamics by making the clock signal cycle adjustable rather than fixed. The control circuit dynamically adjusts the clock cycle based on process corner detection, allowing the system to adapt to manufacturing variations and maintain consistent alert signal pulse widths across different process conditions.
Solution Approach 2:
The patent changes the parameter of clock signal cycle from a fixed value to a variable that can be adjusted according to process corners. By modifying the clock cycle parameter in response to detected process variations, the system compensates for manufacturing differences and maintains pulse width consistency.
2Manufacturing precision
If the clock signal cycle is adjusted to compensate for process variations, then the pulse width consistency improves, but the circuit complexity increases
Solution Approach 1:
The patent implements feedback by detecting the actual process corner and using this information to adjust the clock signal cycle. The control circuit receives feedback about process variations and automatically compensates by modifying the clock cycle, creating a closed-loop system that maintains pulse width consistency without requiring complex external calibration.
Solution Approach 2:
The system performs self-service by automatically detecting its own process corner and adjusting its clock signal accordingly. The memory device self-calibrates without external intervention, using internal process corner detection and automatic clock cycle adjustment to maintain consistent alert signal pulse widths.
Data Source
AI summary
A signal generation circuit includes: a clock circuit configured to receive a flag signal and generate a clock signal; a control circuit configured to generate a control circuit; and a generation circuit connected to both the clock circuit and control circuit and configured to receive the clock signal, the control signal, and the flag signal and generate a target signal, wherein when the flag signal changes from a first level to a second level, the target signal changes from a third level to a fourth level, and after the target signal is maintained at the fourth level for a target duration, the target signal changes from the fourth level to the third level; and the generation circuit is further configured to determine the target duration according to the clock signal and control signal.