Data Strobe Receiver Circuit With Adaptive Noise Suppression

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

LPDDR4 memory devices experience malfunctions due to amplified noise on data strobe signals when the write data strobe function is turned off, leading to incorrect logic states and potential failures in the control circuit.

Innovation Solution

A memory device with a receiver circuit that includes a differential amplifier, on-die terminators, and noise-suppression circuits controlled by a mode register setting value to selectively couple resistors to input terminals based on signal conditions, thereby suppressing noise on data strobe signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the write data strobe function is turned off, then power consumption is reduced, but noise on data strobe signals is amplified causing malfunctions

Engineering Contradiction:

Improvepower consumptionVSAvoidcontrol circuit functionality

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent introduces an intermediary noise suppression circuit between the differential amplifier and the control circuit. This circuit includes additional amplifiers and resistors that act as a mediator to filter out noise from the data strobe signals before they reach the control circuit, preventing noise-induced malfunctions while allowing the write data strobe function to remain off for power savings

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements a feedback mechanism where the noise suppression circuit continuously monitors the output of the differential amplifier and adjusts its filtering action accordingly. The control circuit receives feedback about noise levels and dynamically adjusts the noise suppression parameters to maintain reliable operation while minimizing power consumption

Inventive Principle:

Principle #23Feedback

2Power

If the differential amplifier amplifies data strobe signals, then signal strength is increased, but noise amplitude is also amplified causing logic state errors

Engineering Contradiction:

Improvesignal strengthVSAvoidnoise amplitude

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent segments the signal processing function into two distinct stages: first, the differential amplifier amplifies both signal and noise; second, the noise suppression circuit separately processes and removes noise from the amplified signal. This segmentation allows the system to achieve strong signal amplification while independently addressing noise removal

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The noise suppression circuit uses a composite structure combining multiple amplifiers with different gain characteristics and resistive elements. This composite approach allows the circuit to selectively amplify desired signal components while attenuating noise frequencies, effectively separating signal from noise after the initial amplification stage

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively reduces noise amplitude on data strobe signals, ensuring correct logic states and preventing control circuit failures, even when the write data strobe function is off.

Implementation Method 1

The differential amplifier is configured to amplify the first data strobe signal and the second data strobe signal to generate a third data strobe signal and a fourth data strobe signal

Methodology Applied

Scientific EffectDifferential amplification:

Implementation Method 2

The first noise-suppression circuit is configured to selectively couple a first resistor to the first input terminal of the differential amplifier according to the third data strobe signal, the fourth data strobe signal, and the noise-suppression control signal

Methodology Applied

Scientific EffectNoise suppression through resistive coupling: Electrical Resistance

Data Source

PatentUS20250218472A1Method for adaptive noise suppression on data strobe signals and memory device using the same

Publication Date: 2025.07.03 NAN YA TECH

AI summary

A method for adaptive noise suppression on data strobe signals is provided. The method includes the following steps: determining whether a first data strobe signal and a second data strobe signal satisfy a first condition; in response to the first data strobe signal and the second data strobe signal satisfying the first condition, determining whether a mode register setting value (MRSV) associated with a first on-die terminator and a second on-die terminator is greater than N; and in response to the MRSV being not greater than N, decoupling a first resistor and a second resistor from a first input terminal and a second input terminal of a differential amplifier, respectively; and in response to the MRSV being greater than N, coupling the first resistor and the second resistor to the first input terminal and the second input terminal of the differential amplifier, respectively.