Acutechnology Patents Process Insensitive Bandgap

SAN JOSE, CA, July 6 -- Acutechnology Semiconductor Inc., innovators in power management, today announced that the US Patent and Trademark Office has issued to Acutechnology US patent number US7,071,673, "Process Insensitive Voltage Reference". The patented new technique allows the design of bandgap references, temperature sensors, and similar circuitry with higher precision than has been typically been possible without trimming.

The patented AcuRef™ technology removes a significant error from typical bandgap references. Bandgap references rely on summing the voltage of a forward bised silicon junction, with its negative temperature coefficient, and a second voltage that is designed to be proportional to absolute temperature (PTAT). When added in appropriate proportion, the resultant voltage has a very low temperature coefficient. Over the last three decades, the accuracy of this PTAT source and the elimination of second-order errors have significantly improved reference circuits, particularly if the reference is trimmed to remove the process variations in the diode drop. Acutechnology's AcuRef™ finally removes the effect of process variation by using the correlation between absolute Vbe of a bipolar transistor and its current gain; the circuit automatically adjusts the proportion of PTAT added based on the actual value of the Vbe without a trimming step.

Acutechnology has a variety of ongoing R&D efforts. Additional patent applications, including those for motor control and power supply circuits, continue to be prosecuted with the US Patent and Trademark office.

About Acutechnology

Acutechnology Semiconductor Inc., headquartered in San Jose, California, is dedicated to servicing the power management marketplace. With decades of experience in the design, manufacture, and marketing of analog products, Acutechnology is working to provide new and innovative solutions in this very cost-conscious marketplace. Acutechnology designs custom and standard product in a variety of semiconductor technologies. Using a global manufacturing infrastructure, Acutechnology combines its expertise to that of its manufacturing partners to maintain the highest levels of quality and service.

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