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Infineon Technologies has introduced a new family of Hall sensors aimed at safety and comfort applications in cars. The Hall ICs feature high-precision unipolar or bipolar magnetic switching behaviour.
Infineon Technologies has introduced a new family of Hall sensors aimed at
safety and comfort applications in cars. The Hall ICs feature high-precision
unipolar or bipolar magnetic switching behaviour.
Active error compensation - using a "chopped" Hall system - suppresses the
effect of offset components. Resistance to electrostatic and electromagnetic
interference has been designed in to make the new Hall sensors very
cost-efficient and reliable.
The TLE49x6 family ICs were developed for use as position and proximity
switches in wide variety of automotive subsystems, such as seat adjusters,
seat-belt buckles, and electric windows and sunroofs. For example, the
position of a seat can be sensed and the information sent to the air bag
control mechanism to automatically tailor the deployment force to the size
of the person - reducing the chance of injury being caused by the air bag.
The Hall switches incorporate the Hall sensor cell, bias generator,
compensating circuit, comparator, oscillator and output transistor. The
compensating circuits of the Hall switches balance out possible
manufacturing process-related influences. At the same time, the sensors
active error compensation capability suppresses the effects of other
voltage-generating mechanisms, such as mechanical stress, that may generate
an offset to the Hall voltage and impair the measuring accuracy of the
sensors.
Mechanical stress can be caused, for instance, by thermal influences, which
occur as a result of further processing when soldered into the system or
during over-moulding. The chopper technology, in conjunction with the
integral comparator, ensures high-precision magnetic switching. All the
members of the new TLE49x6 family of Hall sensors are now available in
sample quantities, with series production scheduled to commence in Q3 2003.
Infineon offers these new Hall sensors in space-saving packages - both in
wired and surface-mounted technology.


Microsystem producer PHS MEMS announced the availability of custom
micro-electro-mechanical system (MEMS) based integrated passive devices
(IPDs) and advanced processes to use within RF modules for wireless
hand-held equipment and for other mobile applications. Typical passive
devices - which include resistors, inductors and capacitors - are discrete
components that take up large amounts of space on a circuit board or add
complexity to an RF module. Samples of devices are available for evaluation
immediately.
PHS MEMS integrated passive devices are fabricated on a millimeter scale
using volume manufacturing and assembly methods similar to silicon
processing. They can be integrated directly onto a chip or module to
eliminate the need for discrete devices. They also promise lower costs and
improved tolerances.
PHS MEMS hopes for applications from producers of next-generation multiband
cellular phones, wireless PDAs and laptop computers using WiFi (or WLAN)
connections.
PHS MEMS IPD package allows the implementation of functions including
harmonic filters, directional couplers, diplexers and PA matching circuits.
The company offers original equipment manufacturers (OEMs) the option of
full custom design of IPD-based products, standardised manufacturing
processes for quick turnaround and consistent feedback against target
specification.



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