Data Sampling Circuit With Decision Feedback Equalization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In low power double data rate (LPDDR) memories, the increasing signal transmission rate leads to channel loss, causing intersymbol interference, which existing equalizers struggle to compensate for without increasing power consumption.
Innovation Solution
A data sampling circuit incorporating a first and second sampling module, a latch module, and a decision feedback equalization module, along with an offset compensation module, to reduce intersymbol interference while minimizing power consumption by integrating decision feedback equalization in a parallel configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate equalizer is arranged at the receiver to compensate for channel loss, then intersymbol interference is reduced, but power consumption increases
Solution Approach 1:
The patent combines the equalization function with the data sampling circuit by integrating a decision feedback equalization module that uses feedback from the sampling output to compensate for channel loss. This merging eliminates the need for a separate equalizer while maintaining signal quality compensation.
Solution Approach 2:
The patent implements a decision feedback equalization mechanism where the output of the sampling circuit is fed back to generate compensation signals that counteract channel loss effects. This feedback approach enables intersymbol interference reduction using the existing sampling circuit infrastructure without requiring additional power-consuming equalizer components.
2Productivity
If signal transmission rate is increased to improve data throughput, then productivity is improved, but channel loss increases causing more intersymbol interference
Solution Approach 1:
The decision feedback equalization module continuously monitors the sampled output and generates feedback signals to compensate for channel loss effects. This feedback mechanism dynamically adjusts to maintain signal quality even at high transmission rates where channel loss is more severe.
Solution Approach 2:
The patent adjusts equalization parameters based on the transmission conditions by using the feedback from the sampling circuit. The decision feedback equalization module modifies its compensation characteristics dynamically to optimize signal quality across varying transmission rates without requiring separate equalizer hardware.
Data Source
AI summary
Embodiments provide a data sampling circuit and a data sampling device. The sampling circuit includes: a first sampling module configured to respond to a signal from a data signal terminal and a signal from a reference signal terminal and to act on a first node and a second node; a second sampling module configured to respond to a signal from the first node and a signal from the second node and to act on a third node and a fourth node; a latch module configured to input a high level signal to a first output terminal and input a low level signal to a second output terminal or input the low level signal to the first output terminal and input the high level signal to the second output terminal according to a signal from the third node and a signal from the fourth node; and a decision feedback equalization module.