Automatic frequency controller for power amplifiers used in bio-implanted applications

Issues and challenges

Hannan M A, Hussein A. Hussein, Saad Mutashar, Salina Abdul Samad, Aini Hussain

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

With the development of communication technologies, the use of wireless systems in biomedical implanted devices has become very useful. Bio-implantable devices are electronic devices which are used for treatment and monitoring brain implants, pacemakers, cochlear implants, retinal implants and so on. The inductive coupling link is used to transmit power and data between the primary and secondary sides of the biomedical implanted system, in which efficient power amplifier is very much needed to ensure the best data transmission rates and low power losses. However, the efficiency of the implanted devices depends on the circuit design, controller, load variation, changes of radio frequency coil's mutual displacement and coupling coefficients. This paper provides a comprehensive survey on various power amplifier classes and their characteristics, efficiency and controller techniques that have been used in bio-implants. The automatic frequency controller used in biomedical implants such as gate drive switching control, closed loop power control, voltage controlled oscillator, capacitor control and microcontroller frequency control have been explained. Most of these techniques keep the resonance frequency stable in transcutaneous power transfer between the external coil and the coil implanted inside the body. Detailed information including carrier frequency, power efficiency, coils displacement, power consumption, supplied voltage and CMOS chip for the controllers techniques are investigated and summarized in the provided tables. From the rigorous review, it is observed that the existing automatic frequency controller technologies are more or less can capable of performing well in the implant devices; however, the systems are still not up to the mark. Accordingly, current challenges and problems of the typical automatic frequency controller techniques for power amplifiers are illustrated, with a brief suggestions and discussion section concerning the progress of implanted device research in the future. This review will hopefully lead to increasing efforts towards the development of low powered, highly efficient, high data rate and reliable automatic frequency controllers for implanted devices.

Original languageEnglish
Pages (from-to)23843-23870
Number of pages28
JournalSensors (Switzerland)
Volume14
Issue number12
DOIs
Publication statusPublished - 11 Dec 2014

Fingerprint

power amplifiers
Power amplifiers
controllers
Equipment and Supplies
Controllers
coils
Wireless Technology
Cochlear implants
frequency control
Pacemakers
voltage controlled oscillators
Cochlear Implants
carrier frequencies
power loss
Variable frequency oscillators
power efficiency
data transmission
Microcontrollers
coupling coefficients
Radio

Keywords

  • Automatic controller
  • Bio-implanted devices
  • Bio-telemetry systems
  • Inductive coupling link
  • Power amplifiers

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Biochemistry

Cite this

Automatic frequency controller for power amplifiers used in bio-implanted applications : Issues and challenges. / M A, Hannan; Hussein, Hussein A.; Mutashar, Saad; Abdul Samad, Salina; Hussain, Aini.

In: Sensors (Switzerland), Vol. 14, No. 12, 11.12.2014, p. 23843-23870.

Research output: Contribution to journalArticle

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