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Passive rejustor automates temperature compensation

Posted: 22 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:eTC divider? passive rejustor? temperature compensation accuracy?

Microbridge Technologies Inc. says it has introduced the industry's first passive electronic temperature compensation (eTC) divider, which is suitable for managing temperature in precise analog circuits, optical systems, sensors and power supply compensation and calibration. The MBT-303-A rejustor (re-adjustable resistor) can be used in a wide range of military, aerospace, automotive, industrial, medical and consumer applications.

The first in a family of resistor dividers and networks using eTC technology, the MBT-303-A is a high accuracy dual 30K divider (two resistors in series) where each resistor can be set to any value between 21- and 30K with an accuracy of 0.01 percent. Two rejustor elements in the same package make it easier to implement divider networks where resistors must be equally matched, said Microbridge.

Available in a 16-lead QFN package or 8-pin SOIC package, the MBT-303-A passive rejustor enables automated, independent adjustment of both resistance and the temperature coefficient of resistance (TCR). Control of TCR that is independent of ohmic value enables the MBT-303-A to 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, according to the company.

The eTC-based MBT-303-A, configured using Microbridge's Rejust-it software, is the said to be the first passive device to automate the adjustment process to compensate for temperature-induced drift using only analog components. Rejustors shift compensation in temperature-sensitive applications from an active process to a passive one. This method is said to eliminate many of the unwanted side effects typically associated with digital compensation to achieve accurate and cost-effective temperature compensation.

In addition, 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. They also eliminate the need for thin-film and thick-film laser trimming currently used in IC manufacturing.

Pricing for the device starts at $1.67 each in quantities of 1,000. The MBT-303-A passive rejustor is currently sampling.

- Gina Roos

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