Sense Amplifier Delay Chain Voltage Offset
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Solution Overview
Problem
Current memory technologies face challenges with analog sense amplifiers due to voltage offsetting caused by transistor mismatch and digital sense amplifiers have low operation speed.
Innovation Solution
A sense amplifier design utilizing two delay chains connected to bit lines and complementary bit lines, converting voltage differences into phase delays to determine which voltage is higher, thereby minimizing voltage offsetting and enhancing operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If analog sense amplifier is used, then operation speed is fast, but voltage offsetting occurs due to transistor mismatch
Solution Approach 1:
The patent replaces the traditional analog voltage comparison mechanism with a digital delay-based detection mechanism. Instead of directly comparing voltages using analog circuits susceptible to mismatch, the invention converts voltage information into time delay information through delay chains, which are then processed digitally to determine which bit line has the higher voltage. This substitution eliminates the voltage offsetting problem inherent in analog differential amplifiers.
2Measurement precision
If digital sense amplifier is used, then voltage offsetting is reduced, but operation speed becomes slow due to full swing operation requirement
Solution Approach 1:
The patent employs partial action by using only a portion of the available voltage swing to generate the delay signal, rather than requiring full swing operation. The delay chains process voltage differences with partial swing, and the phase detection circuit determines the result based on phase relationships rather than complete voltage transitions. This approach maintains the accuracy benefits of digital detection while achieving faster operation speeds by reducing the required voltage swing amplitude.
3Ease of operation
If voltage values are directly compared, then determination is straightforward, but manufacturing mismatch causes offset errors
Solution Approach 1:
The patent introduces delay chains as intermediary elements between the voltage signals and the comparison operation. Instead of directly comparing voltages, the invention first converts voltage information into time delay information through the delay chains, which act as mediators. The phase detection circuit then compares the delayed signals, effectively using time delay as an intermediary representation of voltage magnitude. This intermediary approach preserves the simplicity of comparison while eliminating manufacturing mismatch errors.
Data Source
AI summary
A sense amplifier and a method for determining the values of the voltages on a bit-line pair are provided. The sense amplifier comprises a first delay chain and a second delay chain. The first delay chain is electrically connected to a bit line and configured for receiving a clock signal and a first voltage on the bit line, so as to delay the clock signal according to the first voltage and to generate a first delay signal accordingly. The second delay chain is electrically connected to a complementary bit line and configured for receiving the clock signal and a second voltage on the complementary bit line, so as to delay the clock signal according to the second voltage and to generate a second delay signal accordingly.