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Design method of optical detection systems based on transimpedance amplifiers.

Patricia M E Vázquez¹, Francisco E Veiras¹, Ligia Ciocci Brazzano¹

¹Universidad de Buenos Aires, Facultad de Ingeniería, Departamento de Física, GLOmAe, Paseo Colón 850, C1063ACV Buenos Aires, Argentina.

The Review of Scientific Instruments

|December 2, 2021

Summary

This study introduces a simplified design method for transimpedance amplifier detection systems, optimizing performance by analyzing noise and stability. The approach systematically finds component values for improved signal-to-noise ratio and operating frequency.

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Area of Science:

Electronics
Instrumentation
Signal Processing

Background:

Designing transimpedance amplifier (TIA) systems involves balancing coupled constraints like noise, frequency response, and stability.
Existing methods often lack a systematic approach to optimize these parameters simultaneously.

Purpose of the Study:

To present a straightforward and systematic design method for transimpedance amplifier-based detection systems.
To provide a quantitative approach for evaluating design trade-offs based on key performance metrics.

Main Methods:

Analysis of noise and stability using a small-signal model.
Systematic procedure for determining acceptable feedback network component values.
Definition of a merit function to quantitatively assess performance (SNR, frequency, phase margin).

Main Results:

A systematic procedure for selecting feedback network components in TIA systems.
A merit function enabling quantitative comparison of design performance.
Demonstrated optimization of an optical detection system using a PIN photodiode.

Conclusions:

The presented method simplifies the complex design of TIA systems.
The approach allows for optimized performance regarding signal-to-noise ratio, operating frequency, and stability.
The method is applicable to various detection systems, including optical ones.