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AN912
| Title |
Title
Designing LF Talkback for a Magnetic Base Station
|
|---|---|
| Name |
Name
AN912
|
| Date |
Date
06/24/2015
|
| Description |
Description
This application note builds on application note AN232 Low Frequency Magnetic Transmitter Design (DS00232). It covers the design process to implement LF Talkback functionality. AN232 covers some of the magnetism basics and design principles to implement the drive circuitry. LF Talkback generally refers to the process in which a transponder can communicate back to a magnetic transmitter base station by loading the generated magnetic field. By measuring the small changes in the transmitter coil's voltage, used to generate the field, the communications’ data is extracted. LF Talkback is commonly used in RFID, automotive transponders, active transponders, and many other bidirectional LF communications topologies. This document will cover the different stages needed to implement a typical LF Talkback system and explain the process in choosing the different stage characteristics. It explains the various performance and cost tradeoffs made for the reference design and how it can be adapted to better suit the readers needs.
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