Receiver Input Buffering for Noise-Suppressed Duty Ratio Correction

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Solution Overview

Problem

Conventional receivers can malfunction due to noise applied to their input terminals when the noise is applied inconsistently, causing a voltage difference that leads to erroneous output signals.

Innovation Solution

A receiver design incorporating a first and second input buffering circuit that outputs signals with inverted duty ratios by applying offset signals, and a signal mixing circuit to combine these signals and correct the duty ratio, thereby preventing noise from affecting the output when no normal signal is input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If noise is applied inconsistently to the two input terminals due to channel characteristic differences, then a voltage difference is generated that can be amplified by the receiver, but this leads to erroneous output signals and system malfunctions

Engineering Contradiction:

Improveoutput signal accuracyVSAvoidnoise susceptibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of noise into a beneficial filtering mechanism. By introducing offset signals that create intentional voltage differences, the system establishes threshold levels that cause noise-induced voltage differences to be ignored when they fall below the offset threshold, while still allowing valid differential signals to be amplified when they exceed the threshold.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the voltage threshold parameter by introducing offset signals to both input terminals. This parameter change creates a dead zone around zero voltage difference where noise is suppressed, while maintaining the ability to amplify legitimate signals that exceed the offset threshold, thus resolving the contradiction between noise susceptibility and signal amplification.

Inventive Principle:

Principle #35Parameter changes

2Power

If the receiver amplifies differential signals with high gain, then signal amplification performance is improved, but noise-induced voltage differences are also amplified causing erroneous outputs

Engineering Contradiction:

Improvesignal amplification capabilityVSAvoiderroneous output signals

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the amplification threshold parameter by adding offset signals, creating a conditional amplification system. The high gain amplification is maintained for signals exceeding the offset threshold, while signals below the threshold (including noise) are suppressed, thus resolving the contradiction between amplification capability and erroneous output generation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The offset signals act as intermediaries between the input terminals and the amplification process. They mediate by establishing threshold levels that control when amplification should occur, preventing direct amplification of noise while maintaining signal amplification capability for valid inputs.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10056904B2Receiver resilient to noise input

Publication Date: 2018.08.21 SK HYNIX INC

AI summary

A receiver includes a first input buffering circuit configured to output a first signal by comparing an input signal and a first offset signal; a second input buffering circuit configured to output a second signal by comparing the input signal and a second offset signal; and a signal mixing circuit configured to output an output signal with a corrected duty ratio by combining the first signal and the second signal.