This document discusses isoloop magnetic couplers which can replace opto-couplers. Isoloop magnetic couplers use giant magnetoresistance (GMR) technology, consisting of two magnetic layers separated by a nonmagnetic layer. They contain a voltage regulator, GMR bridge, comparator, and transistor. Isoloop couplers offer advantages over opto-couplers like faster operation, excellent noise immunity, and temperature stability. They find applications in digital isolation for devices like ADCs, DACs, and data interfaces. Future developments may yield even higher speed isoloop couplers.

1. ISOLOOP MAGNETIC
COUPLERS REPLACED
OPTO-COUPLERS
Submitted by:
SALMAN B. LULAT
USN:2SA10EE013
ELECTRICALAND ELECTRONICS DEPARTMENT
GUIDENCE BY:
GOURISHANKAR SIR.

2. 1) Introduction
2) Requirement of couplers
3) Coupling devices
4) GMR technology
5) Isoloop magnetic couplers
6) Working
7) Digital isolators
8) Advantages
9) Applications
10) Future scope
11) conclusion
12) References

3. WHAT IS COUPLER?
TRADITIONAL COUPLERS: OPTO-COUPLERS.
WHY WE ARE USING ISOLOOP MAGNETIC COUPLERS?

4.  To transmit the data.
 To make the connection.
 To reduce the connectivity.
 To reduction of space as well as increment of speed.
 To overcome headache.

5.  Electro–mechanical relays.
 Transformer.
 Opto-couplers.
 Magnetic couplers.

6.  WHAT IS GMR???
 IT CONSISTS OF
 2 magnetic layers
 1 nonmagnetic layer

7.  Input current supply
 chip microscopic coil
 Wheatstone bridge GMR sensor
 Isolation receiver

8.  IT CONTAINS
 Voltage regulator
 GMR bridge
 Comparator
 Transistor or switching ckt.
 Current / data o/p

9.  Its on chip configurations
 Can operate at high speed 10Mbd & temperature
 Dynamic power consumption
max. power supply current per channel for isoloop:
I (input) =40(f /fmax) (4/5) mA
Where f =operating frequency
fmax= 50 MHz

10.  Faster operation
 Bandwidth
 Small footprint
 Excellent noise immunity
 Temperature stability

11. Magnetic isolator quickly find their way in to process control and
industrial applications. And its having mostly digital application.
 Digital isolation application:
 ADCs
 DACs
 Multiplexed data transmission
 Data interface
 Digital noise reduction

12.  Magnetic couplers are expected from more manufacturers.
 They will be even faster, they will have more channels, and
more types of integrated bus transceivers will be made
available.
 Higher speed magnetic couplers are under development.
 ICs scale down and become faster. NVE has reported prototype
devices with speeds of 300 Megabaud and less than one
Nanosecond switching times.

13.  ISOLOOP MAGNETIC COUPLERS ARE HAVING SO MANY
ADVANTAGES OVER THE CONVENTIONAL COUPLERS.
 IT CAN REPLACE THE CONVENTIONAL COUPLERS.

14.  J.Daughton and Y. Chen. "GMR Materials for Low Field Applications, "IEEE Trans Magn, Vol.
29:2705-2710, 2003.pp.18-21
 Michael J. Caruso, Tamara Bratland, C. H. Smith, and Robert Schneider, “A New Perspective on
Magnetic Field Sensing,” Sensors Magazine, vol.15, no. 12, (December 2002), pp. 34-46
 Carl H. Smith and Robert W. Schneider, “Low-Field Magnetic Sensingwith GMR Sensors, Part 1:
The Theory of Solid-State Sensing,” Sensors Magazine, vol. 16, no. 9, (September 2002), pp. 76-83.
 Carl H. Smith and Robert W. Schneider, “Low-Field Magnetic
Sensingwith GMR Sensors, Part 2: GMR Sensors and their Applications,”Sensors Magazine, vol. 16,
no. 10, (October 2002), pp. 84- 91.
 http://www.circuitcellar.com/library/print/0502/JEFF/4.asp
 http://www.sensorsmag.com/
 http://www.nve.com/isoloop/news/hispdnr.php
 http://www.electronicstalk.com/news/rho/rho000.html