Channel Loss Compensation Circuits for RF Interconnects

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Solution Overview

Problem

Radio frequency interconnects (RFIs) face channel loss due to frequency response variations across transmission channels, degrading data quality and introducing noise, which affects signal-to-noise ratio and increases error risks in data decoding.

Innovation Solution

Incorporating gain compensation drivers and equalizers in RFIs to modify transmission signals and compensate for channel loss by delaying and amplifying signals, ensuring that received data maintains a predefined signal-to-noise ratio, thereby mitigating channel loss effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmitters modulate data using multiple carriers for communication, then data transmission capability is improved, but channel loss varies across frequencies degrading signal quality

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidsignal quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by implementing separate equalizer circuits for each carrier frequency. Each equalizer is specifically tuned to compensate for the channel loss characteristics at its designated frequency, allowing different parts of the frequency spectrum to be optimized independently according to their specific loss profiles

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs parameter changes by dynamically adjusting the gain and phase parameters of equalizer circuits based on measured channel loss characteristics. The system measures actual channel loss at each frequency and modifies equalizer parameters accordingly to compensate for varying losses across different carriers

Inventive Principle:

Principle #35Parameter changes

2Reliability

If channel loss compensation circuits are added to maintain signal quality, then signal-to-noise ratio is improved, but device complexity increases

Engineering Contradiction:

Improvesignal-to-noise ratioVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements self-service through automatic equalization systems that measure their own channel loss characteristics and automatically adjust their parameters without external intervention. The receiver measures channel loss from transmitted test signals and automatically configures equalizer parameters to compensate for the measured loss

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs feedback mechanisms where the receiver measures channel loss characteristics and feeds this information back to adjust equalizer parameters. The system continuously monitors signal quality and modifies compensation parameters in response to measured channel conditions, creating a closed-loop control system

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11316548B2Channel loss compensation circuits

Publication Date: 2022.04.26 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A circuit includes a transmitter, a transmission channel communicatively coupled with the transmitter, and a receiver communicatively coupled with the transmission channel. The circuit further includes a combiner on a transmitter-side of the transmission channel, a decoupler on a receiver-side of the transmission channel, and a channel loss compensation circuit communicatively coupled between the transmitter and the receiver. The combiner is coupled between the transmitter and the transmission channel. The decoupler is coupled between the receiver and the transmission channel.