Self Refresh Circuit Glitch Removal for Temperature Transitions
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Solution Overview
Problem
The existing self refresh circuits in semiconductor memory devices face failures due to continuous generation of internal active signal pulses around the temperature level transition point, leading to unreliable self refresh operations.
Innovation Solution
A self refresh circuit is designed with a continuous output interrupting unit and a glitch removing unit to manage the internal active signal pulses, including a signal delaying unit, a driving unit, and a control signal generating unit, which interrupts and buffers the signal transmission to prevent continuous pulse generation and glitches, ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the internal active signal period is varied according to temperature using a TCSR circuit, then the self refresh operation adapts to temperature changes, but continuous pulses are generated around the temperature level transition point causing operation failures
Solution Approach 1:
A pulse filtering circuit is introduced as an intermediary component between the TCSR circuit and the self refresh operation. This filtering circuit selectively removes continuous pulses generated around the temperature level transition point while allowing normal periodic pulses to pass through, thereby resolving the contradiction between temperature adaptation and operational reliability
Solution Approach 2:
The harmful continuous pulses are extracted and removed from the internal active signal using the pulse filtering circuit. By identifying and eliminating only the problematic pulses around the temperature transition point, the system maintains temperature adaptability while preventing operation failures caused by continuous pulse generation
2Productivity
If the period of internal active signal decreases with temperature increase, then refresh frequency matches leakage current characteristics, but pulses are generated continuously around temperature transition point
Solution Approach 1:
The pulse filtering circuit converts the harmful continuous pulses into a beneficial filtering action. By detecting and removing only the problematic continuous pulses around the temperature transition point, the system maintains the advantageous temperature-dependent refresh frequency while eliminating the harmful effect of continuous pulse generation
Data Source
AI summary
A self refresh circuit includes a continuous output interrupting unit and a glitch removing unit. The continuous output interrupting unit is configured to receive a delay self refresh signal, transmit a pulse of an internal active signal as a first output active signal and interrupt the transmission of the pulse of the internal active signal during a first time period. The glitch removing unit is configured to generate and output a second output active signal when the first output active signal has a predetermined pulse width.