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Design Example01:23

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Analytical design equations for self-tuned Class-E power amplifier.

Zhe Hu1, Philip Troyk

  • 1Sigenics Inc, Chicago, IL, USA.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

A novel self-tuned Class-E circuit simplifies neural prosthesis transmitter design. This system uses coil current feedback to maintain high efficiency, reducing tuning complexity for inductive coupling power transfer.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Power Electronics

Background:

  • Neural prostheses increasingly rely on inductive coupling for wireless power.
  • Small device sizes necessitate high currents in extracorporeal transmitter coils.
  • Class-E power amplifiers are common but difficult to tune for optimal efficiency.

Purpose of the Study:

  • To present a self-tuned Class-E circuit design for neural prosthesis transmitters.
  • To simplify the tuning process for efficient inductive power transfer.
  • To provide explicit analytical design equations and a detailed procedure.

Main Methods:

  • Sensing the coil current to provide feedback control.
  • Using current feedback to tune the transistor switch timing in the Class-E circuit.
  • Deriving explicit analytical design equations for the self-tuned circuit.

Main Results:

  • The self-tuned circuit maintains high-efficiency operation by adjusting switching.
  • Current feedback simplifies the complex mathematical analysis of Class-E circuits.
  • A predetermined phase angle between switching pulse and coil current is achieved.

Conclusions:

  • The proposed self-tuned Class-E circuit offers a simplified and efficient solution for neural prosthesis power transmitters.
  • This approach facilitates easier tuning compared to conventional Class-E designs.
  • The derived design equations and procedure enable practical implementation.