SRAM Word Line Pulse Width Control for Temperature-Dependent Power Reduction
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Solution Overview
Problem
SRAMs face increased power consumption due to long pulse widths of word line signals, which are fixed based on low-temperature requirements, leading to excessive read current and voltage drops at high temperatures.
Innovation Solution
A pulse signal generator that adjusts the delay time of the clock signal based on temperature, allowing the pulse width of the word line signal to vary accordingly, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse width of the word line signal is fixed based on low-temperature requirements, then the SRAM can operate reliably at low temperatures, but the power consumption increases excessively at high temperatures
Solution Approach 1:
The pulse width of the word line signal is made dynamic rather than fixed. The delay unit adjusts the delay time based on temperature conditions, causing the pulse width to vary dynamically. At low temperatures, a longer pulse width is maintained for reliable operation, while at high temperatures, the pulse width is automatically reduced to decrease power consumption.
Solution Approach 2:
The pulse width parameter is changed according to temperature conditions. By adjusting the delay time of the delay unit, the pulse width parameter varies with temperature - longer at low temperatures for reliability, and shorter at high temperatures for lower power consumption. This parameter adaptation resolves the contradiction between reliability and power consumption.
2Reliability
If a long pulse width is used to ensure data determination at low temperatures, then read operations succeed at low temperatures, but unnecessary power is consumed at high temperatures
Solution Approach 1:
The pulse width is made dynamic through temperature-dependent delay adjustment. The delay unit responds to temperature changes by modifying the delay time, which directly controls the pulse width. This dynamic adjustment ensures sufficient pulse width at low temperatures for successful read operations while reducing pulse width at high temperatures to eliminate unnecessary power consumption.
Solution Approach 2:
The pulse width parameter is adaptively changed based on temperature. The system changes the delay time parameter in the delay unit according to temperature conditions, which in turn changes the pulse width parameter of the word line signal. This parameter adaptation ensures read operation success while minimizing energy loss.
3Reliability
If the delay time is increased to extend pulse width for low-temperature operation, then the voltage difference appears slowly at low temperatures, but the bit line voltage drops significantly at high temperatures
Solution Approach 1:
The delay time is made dynamic through temperature-dependent adjustment. The delay unit automatically increases delay time at low temperatures to allow sufficient voltage difference development, and decreases delay time at high temperatures to prevent excessive bit line voltage drop. This dynamic control resolves the contradiction between voltage difference detection and bit line voltage maintenance.
Solution Approach 2:
The delay time parameter is changed according to temperature conditions. At low temperatures, the delay time parameter is increased to ensure voltage difference appears. At high temperatures, the delay time parameter is reduced to prevent significant bit line voltage drop. This parameter adaptation eliminates the harmful voltage drop while ensuring reliable detection.
Data Source
AI summary
The present disclosure provides a pulse signal generator capable of reducing power consumption by varying the width of a word line signal depending on temperature, including a delay unit which receives a clock signal, delays the signal, and outputs a delayed clock signal while adjusting the delay time of the delayed clock signal depending on temperature, and a pulse generation circuit which receives a clock signal and a delayed clock signal, whose delay time is adjusted depending on temperature, and logically combines them to generate a pulse signal having a pulse width that varies depending on temperature, and an SRAM having the same.