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Analog IC integrates adjustable resistor tech

Posted: 06 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:active analog circuit? adjustable resistor? Rejustors?

Microbridge Technologies Inc. has introduced what it claims as the industry's first active analog circuit to incorporate the company's patented passive, polysilicon adjustable resistor technology known as rejustors. The MBSTC-02 application-specific signal conditioning chip is well-suited for sensor applications with wide manufacturing variations in offset and sensitivity along with temperature-induced offset and sensitivity drift.

The integrated CMOS device incorporates low-noise operational amplifiers with rejustors to provide precise signal conditioning with integrated temperature correction for use with sensors with a negative TC sensitivity. Rejustors are passive adjustable resistors whose ohmic values can be field-adjusted to better than 0.1 percent tolerances, making them suitable for Wheatstone bridge sensor-based applications. This high-precision differential instrumentation amplifier provides complete analog calibration, compensation and amplification for any bridge-type sensors such as pressure sensors, strain gauges, humidity sensors and accelerometers.

The MBSTC-02 simplifies the design process allowing sensor calibration and temperature compensation after final assembly, which negates cumulative errors associated with the assembly processes such as manufacturing tolerance errors, error introduced by stress, packaging, said Microbridge, and low-cost and high-precision adjustment replaces the requirement for digital signal conditioning. The MBSTC-02 also enables the use of lower cost sensors in precision applications.

The MBSTC-02 enables adjustment and verification to be performed in a single temperature cycle. It operates over temperatures ranging from -40C to 125C with a small footprint for high-density applications. Adjustment is performed in-circuit, after assembly and packaging. The adjustment process is isolated from the signal path, allowing true in-circuit adjustment. Once adjusted, the MBSTC-02 maintains its configuration indefinitely without standby power or a boot-up sequence, said Microbridge.

Pricing starts at $1.99 each in quantities of 1,000. The MBSTC-02 bridge is currently sampling. Production products will be available in a QFN-16 package.

Microbridge is exhibiting at DesignCon Feb. 4-7 and is present at the International Solid State Conference, ISSCC2008, Feb. 3-7.

- Gina Roos

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