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High-Sensitivity Large-Area Photodiode Read-Out Using a Divide-and-Conquer Technique.

Guillermo Royo¹, Carlos Sánchez-Azqueta², Concepción Aldea¹

¹Department of Electronic Engineering and Communications, Universidad de Zaragoza, 50009 Zaragoza, Spain.

Sensors (Basel, Switzerland)

|November 10, 2020

Summary

This study introduces a novel method to enhance optical read-out sensitivity in large photodiodes (PD). By segmenting PDs and using multiple transimpedance amplifiers (TIAs), researchers achieved significant improvements in signal-to-noise ratio.

Keywords:

integrated photodiode low-noise amplifier noise reduction techniques photodiode read-out transimpedance amplifier

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Area of Science:

Photonics and Optoelectronics
Integrated Circuit Design

Background:

Traditional large integrated photodiodes (PD) face limitations in optical read-out sensitivity.
Existing methods for improving PD sensitivity often require complex modifications or compensation techniques.

Discussion:

A novel 'divide-and-conquer' technique is proposed, segmenting large PDs into multiple smaller units.
Each segmented PD unit is connected to a dedicated transimpedance amplifier (TIA), with outputs combined for signal processing.

Key Insights:

This approach significantly enhances signal-to-noise ratio compared to conventional methods.
An increase of 7.9 dBm in sensitivity and 8.7 dBΩ in transimpedance was demonstrated with 16 parallel paths.
The technique offers substantial improvements without additional complex modifications or compensation.

Outlook:

The proposed method is compatible with any transimpedance amplifier (TIA) design and fabrication process.
This technique is adaptable to various technologies that allow photodiode integration.
Future work may explore further optimization of segmentation and amplification strategies for even greater sensitivity gains.