Microbridge Dramatically Increases Accuracy of Temperature Compensation By More Than 10X With Flexible Rejustors

    Innovative Re-adjustable Resistors Maintain High Accuracy Over an Extended
    Temperature Range for Precision Analog Circuits

    MONTREAL, Aug. 13 /CNW/ -- The leader in innovative analog calibration
technology, Microbridge Technologies, Inc. today introduced the MBT-303-A
rejustor (re-adjustable resistor), the world's first passive electronic
Temperature Compensation (eTC) divider, ideal for managing temperature in
precise analog circuits, optical systems, sensors, and power supply
compensation and calibration across a wide range of military, aerospace,
automotive, industrial, medical, and consumer applications.
    The first in a family of resistor dividers and networks employing eTC
technology, the MBT-303-A is a high accuracy dual 30K ohm divider (two
resistors in series) where each resistor can be set to any value between 21K
and 30K ohms with an accuracy of 0.01%.  Having two rejustor elements in the
same package makes it easier to implement divider networks where resistors
must be equally matched.
    The MBT-303-A rejustor enables automated, independent adjustment of both
resistance and the Temperature Coefficient of Resistance (TCR), which
determines how resistance changes as the temperature changes.  Control of TCR
that is independent of ohmic value enables the MBT-303-A to not only provide
one to two orders of magnitude performance improvement for analog designs but
also maintain consistency of resistance over an extended temperature range for
circuits that require set-on-test calibration and compensation.
    Until now it has not been possible to automate the adjustment process to
compensate for temperature-induced drift using only analog components.  The
eTC-based MBT-303-A, configured using Microbridge's Rejust-it software, is the
first passive device to solve analog problems in the analog domain using
devices that are suitable for small volume niche markets to mass produced
commercial products.
    "This is perhaps the most important improvement to the resistor in more
than a century," said Bob Frostholm, vice president, Marketing and Strategic
Alliances at Microbridge.  "Automated calibration and temperature compensation
in the analog domain has not been possible until now.  Analog engineers have
been forced to use inadequate solutions in the past because this technology
wasn't available.  Rejustors based on eTC technology provide better response
to the analog environment, yielding more accurate sensors, power-management
devices, opto-electronics, and analog amplifiers."
    Accurate Compensation of Precision Analog Circuits
    Variations in temperature can wreak havoc in even the most carefully
designed analog systems since even small changes in temperature can alter
performance and precision.  Additionally, manufacturing variances in circuits
require that compensation be adjusted for each individual circuit. Temperature
compensation improves the precision of analog circuits in applications across
the board, including increasing accuracy in catheters, tuning LCD panel
displays, adjusting power supplies, calibrating sensors of all kinds,
replacing digital potentiometers, and superseding less efficient compensation
techniques such as fuses or laser trimming, to name a few.
    Rejustors shift compensation in temperature-sensitive applications from
an active process to a passive one.  Traditionally, engineers have had to
compensate for changes in temperature using complex digital circuitry
compromised of a microprocessor and D/A converters switching out fixed
resistances.  This approach is limited in accuracy (about .1% for a
compensation circuit employing 10 switches) and consumes a notable amount of
power.  The additional circuitry involved also adds further uncertainties that
reduce accuracy.
    Rejustors eliminate many of the detrimental side-effects associated with
digital compensation to achieve accurate and cost-effective temperature
compensation.  In-circuit adjustability of both ohmic resistance and TCR, as
well as support for positive and negative temperature coefficients, enables
developers to apply compensation after devices such as sensors are fully
manufactured and hermetically sealed.  Rejustors also eliminate the need for
thin and thick film laser trimming currently used in IC manufacturing.  The
MBT-303-A requires no power source during operation, does not suffer from
wiper resistance, and no external temperature sensor is required since the
rejustor is its own temperature sensor as well as adjustment controller.
Rejustors are capable of replacing complex digital potentiometers and can be
used to raise the performance of lower cost analog circuits to the level of
higher precision circuits.
    "Rejustors are ideal for precision analog systems and will transform how
the electronics industry compensates devices sensitive to temperature
variations," said  Richard Wawrzyniak, Sr. market analyst, ASIC & SoC.
"Rejustors achieve true cost savings by reducing system complexity while
increasing accuracy across the entire spectrum of electronic applications."
    Pricing & Availability
    Available in a 16-lead QFN package or 8-pin SOIC package, the new
MBT-303-A passive rejustor is currently sampling and costs $1.67 each in
quantities of 1,000.  For sales enquiries, contact Microbridge at
    For more information on Rejustors, please click on
http://www.mbridgetech.com/resistor-technology/resistor-white-papers.php for a
Microbridge technical whitepaper on Rejustors.  Images are available at
    About Electronic Temperature Compensation
    Electronic Temperature Compensation (eTC) is the underlying technology
behind the high accuracy of rejustors.  eTC thermally isolates resistive films
typically found in integrated circuits and, through the use of a highly
localized and electrically-controlled heat source, adjusts the annealing of
polysilicon crystal structures to deterministically control resistance.  eTC
can be utilized as a passive component such as a rejustor or implemented
directly on an IC.
    About Microbridge Technologies
    Microbridge Technologies, Inc. is the leading manufacturer and licensor
of next step electronic calibration products and solutions in the consumer,
automotive, medical and other industries that need to improve manufacturing
yields and productivity and enter new markets.  Microbridge's resistor
calibration products (Rejustor) and enabling technology are the first
integrated calibration and temperature compensation systems for analog circuit
designs and production.  Microbridge's technology enables product designers to
achieve one-step calibration and passive adjustment, is adaptive and
adjustable in circuit, and it allows calibration in the analog domain to
improve the design of current and future products.  Microbridge is a privately
held company with headquarters in Montreal, Canada and offices in Boston, Mass
and San Jose, Calif. For more information please visit

For further information:

For further information: Sacha Arts of Bella Vista Communications, 
+1-408-356-3099, s.arts@comcast.net, for Microbridge Technologies, Inc. Web
Site: http://www.mbridgetech.com

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