Transimpedance Amplifier Gain Control Using Dual Replica Servo Loops

Solution Overview

Problem

Conventional copper data channels face signal attenuation and crosstalk due to radiated electromagnetic energy, which are difficult to mitigate effectively with existing techniques, limiting scalability and requiring significant power and complexity.

Innovation Solution

A photonically-enabled integrated circuit with a dual replica and servo loop system for accurate gain adjustment of transimpedance amplifiers, using optoelectronic devices and optical waveguides to enhance signal processing and reduce channel limitations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If equalization, coding, and shielding techniques are used to mitigate signal attenuation and crosstalk in copper data channels, then signal quality is improved to some extent, but power consumption, system complexity, and cable bulk increase significantly

Engineering Contradiction:

Improvesignal qualityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces electrical signal transmission through copper channels with optical signal transmission through photonic channels. This substitution eliminates the fundamental electromagnetic interference and attenuation problems inherent in copper systems, achieving superior signal quality without requiring complex equalization, coding, or shielding techniques.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the transmission medium parameter from electrical conductors (copper) to optical waveguides, fundamentally altering the transmission characteristics. This parameter change enables signal transmission with dramatically reduced attenuation and no crosstalk, while the integrated photonic circuit maintains compact form factor and low power consumption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If equalization, coding, and shielding techniques are used to mitigate signal attenuation and crosstalk, then signal quality is improved, but power consumption increases considerably

Engineering Contradiction:

Improvesignal qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces electrical signal transmission through copper channels with optical signal transmission through photonic channels. This substitution eliminates the fundamental electromagnetic interference and attenuation problems inherent in copper systems, achieving superior signal quality without requiring complex equalization, coding, or shielding techniques.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If copper data channels are used to meet bandwidth requirements, then existing infrastructure can be utilized, but signal attenuation and crosstalk limit reach and scalability

Engineering Contradiction:

Improvebandwidth capacityVSAvoidsignal reach

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces electrical signal transmission through copper channels with optical signal transmission through photonic channels. This substitution eliminates the fundamental electromagnetic interference and attenuation problems inherent in copper systems, achieving superior signal quality without requiring complex equalization, coding, or shielding techniques.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 system provides improved signal processing and scalability by accurately controlling gain in transimpedance amplifiers, reducing noise and power consumption, and enabling efficient optical communication.

Implementation Method 1

a photodiode receiving the optical signal and generating an electrical signal

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Data Source

PatentEP3046256B1Method and system for accurate gain adjustment of a transimpedance amplifier using a dual replica and servo loop

Publication Date: 2022.07.06 LUXTERA INC

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Figure 1B
Figure 1C

AI summary

Methods and systems for accurate gain adjustment of a transimpedance amplifier using a dual replica and servo loop is disclosed and may include, in a transimpedance amplifier (TIA) circuit comprising a first TIA, a second TIA, and a third TIA, each comprising a configurable feedback impedance, and a control loop, where the control loop comprises a gain stage with inputs coupled to outputs of the first and second TIAs and an output coupled to the configurable feedback impedance of the second and third TIAs: configuring a gain level of the first TIA by configuring its feedback impedance, configuring a gain level of the third TIA by configuring a reference current applied to an input of the first TIA, and amplifying a received electrical signal to generate an output voltage utilizing the third TIA. The reference current may generate a reference voltage at one of the inputs of the gain stage.