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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Field-Programmable Gate Array (FPGA)-Based Lock-In Amplifier System with Signal Enhancement: A Comprehensive Review

Jose Alejandro Galaviz-Aguilar1, Cesar Vargas-Rosales1, Francisco Falcone1,2

  • 1Tecnologico de Monterrey, School of Engineering and Science, Monterrey 64849, Mexico.

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|January 25, 2025
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Summary
This summary is machine-generated.

Lock-in amplifiers (LIAs) precisely extract weak signals in noisy environments. This study reviews digital LIA architectures and introduces a novel method to enhance spurious-free dynamic range (SFDR) for advanced measurement precision.

Keywords:
additive white Gaussian noise (AWGN)field-programmable gate array (FPGA)lock-in amplifiers (LIAs)phase sensitive detector (PSD)spurious-free dynamic range (SFDR)

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Area of Science:

  • Electrical Engineering
  • Measurement Science
  • Biomedical Engineering

Background:

  • Lock-in amplifiers (LIAs) are essential for extracting weak signals from noisy data in precision measurement.
  • Advances in signal processing and hardware enable accurate signal extraction in challenging environments.
  • Bioelectrical impedance measurements are vital in healthcare for non-invasive analysis of biological tissues.

Purpose of the Study:

  • To review techniques for high-frequency resolution and precise phase detection in digital LIA reference signals using Field-Programmable Gate Array (FPGA) designs.
  • To present insights into single- and dual-phase digital LIA architectures for enhanced measurement precision.
  • To introduce a novel method for improving the spurious-free dynamic range (SFDR) of LIAs.

Main Methods:

  • Comprehensive review of existing techniques for digital LIA architectures.
  • Analysis of Field-Programmable Gate Array (FPGA) designs for LIA reference signal processing.
  • Development and evaluation of a novel method to enhance spurious-free dynamic range (SFDR).

Main Results:

  • Detailed review of single- and dual-phase digital LIA architectures and their precision.
  • Identification of key techniques for high-frequency resolution and phase detection in FPGA-based LIAs.
  • Demonstration of a novel method significantly enhancing LIA's spurious-free dynamic range (SFDR).

Conclusions:

  • Digital LIAs, particularly those implemented with FPGAs, offer advanced precision for signal extraction.
  • The proposed method for enhancing SFDR improves LIA performance in complex measurement systems.
  • High-performance LIAs are crucial for diverse applications, including advanced bioelectrical impedance measurements.