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Related Concept Videos

Instrumentation Amplifier01:25

Instrumentation Amplifier

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An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
654
Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

263
A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
263
BJT Amplifiers01:14

BJT Amplifiers

540
Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role...
540
Cascaded Op Amps01:16

Cascaded Op Amps

691
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.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
691
MOSFET Amplifiers01:17

MOSFET Amplifiers

204
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...
204
Sum and Difference OpAmps01:22

Sum and Difference OpAmps

828
Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's...
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BioMEMS and Cellular Biology: Perspectives and Applications
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Amplifiers in Biomedical Engineering: A Review from Application Perspectives.

Lida Kouhalvandi1, Ladislau Matekovits2,3,4, Ildiko Peter5

  • 1Department of Electrical and Electronics Engineering, Dogus University, Istanbul 34775, Turkey.

Sensors (Basel, Switzerland)
|February 28, 2023
PubMed
Summary
This summary is machine-generated.

This review surveys implanted power amplifiers for biomedical devices, crucial for wireless communication in continuous disease monitoring. It aids researchers in selecting optimal designs for advanced medical applications.

Keywords:
amplifiersbiomedical applicationsdiseaseimplantable amplifier designsindustrialmedical (ISM) bandspatientscientific

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Continuous disease monitoring via biomedical technologies and wearable electronics is increasingly vital.
  • Implantable electronic devices require efficient wireless communication, with power amplifiers being critical transmitter components.

Purpose of the Study:

  • To provide a comprehensive review of designed implanted power amplifiers for advanced biomedical applications.
  • To offer researchers a general overview of available solutions for selecting suitable circuit designs.

Main Methods:

  • Systematic literature review of published research on implanted amplifiers.
  • Categorization of amplifiers based on design parameters such as amplifier class, CMOS technology, frequency band, output power, and efficiency.

Main Results:

  • Compilation of diverse implanted amplifier designs for biomedical applications.
  • Analysis of design variations in terms of performance metrics and technological implementations.

Conclusions:

  • The survey highlights the importance of power amplifier performance in implantable biomedical devices.
  • Researchers can utilize this review to identify and select appropriate amplifier designs for their specific needs.