Adaptive Data Strobe Noise Suppression in LPDDR4 Receiver Circuits

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Solution Overview

Problem

LPDDR4 memory devices experience malfunctions due to noise amplification of data strobe signals by differential amplifiers, leading to control circuit failures when the write data strobe function is off.

Innovation Solution

A memory device with a receiver circuit that includes a differential amplifier, on-die terminators, and noise-suppression circuits controlled by a noise-suppression control circuit to selectively couple resistors based on mode register settings and data strobe signal conditions for adaptive noise suppression.

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 leading to control circuit failures

Engineering Contradiction:

Improvepower consumptionVSAvoidcontrol circuit reliability

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 selectors that process the data strobe signals before they reach the control circuit, effectively filtering out amplified noises while maintaining proper signal levels for reliable control operations even when the write data strobe function is disabled

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the traditional mechanical switching approach with an electronic signal processing approach using differential amplifiers, noise suppression circuits, and selectors. Instead of physically disconnecting or grounding signals, the system uses electronic circuitry to selectively amplify and filter signals based on operational mode, providing more precise control over noise suppression while maintaining circuit reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If the differential amplifier amplifies data strobe signals, then signal detection capability is improved, but noise amplification occurs leading to logic state errors

Engineering Contradiction:

Improvesignal detection capabilityVSAvoidnoise amplification

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by implementing noise suppression circuits with specific characteristics tailored for data strobe signal processing. The noise suppression circuit includes amplifiers with controlled gain and selectors that operate specifically on the data strobe signals, providing localized noise filtering without affecting other signal paths. This allows the differential amplifier to maintain its high gain for signal detection while the noise suppression circuit locally attenuates amplified noises

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs feedback mechanisms where the noise suppression circuit continuously monitors the amplified data strobe signals and adjusts its filtering action accordingly. The selector circuits respond to the signal levels and noise characteristics, dynamically adjusting the signal path to maintain optimal signal-to-noise ratio. This feedback approach allows the system to maintain high signal detection capability while continuously suppressing noise that may vary with operating conditions

Inventive Principle:

Principle #23Feedback

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 suppresses noise on data strobe signals, ensuring accurate logic states and preventing control circuit failures, thereby enhancing the reliability of LPDDR4 memory operations.

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 EffectSignal 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

PatentUS12505867B2Method for adaptive noise suppression on data strobe signals and memory device using the same

Publication Date: 2025.12.23 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.