HSINCHU, Taiwan, June 20, 2005 - UMC (NYSE: UMC; TSE: 2303), a world leading semiconductor foundry, today announced it has fabricated a Voltage-Controlled Oscillator (VCO) with a record-setting fundamental operating frequency of 105-GHz using its 0.13um RFCMOS process technology. The chip was developed by the Silicon Microwave Integrated Circuits and Systems Research Group (SIMICS), Department of Electrical and Computer Engineering at the University of Florida, Gainesville.

Until now, the highest recorded fundamental operating frequency for CMOS circuits was a 103-GHz oscillator fabricated using a 90nm CMOS process that consumed approximately four times more power. The new effort by the University resulted in the 105-GHz VCO as well as a second 99-GHz VCO with a tuning range of 2.4 GHz, using the 0.13um process. This effort signifies that VCOs for the 94-GHz industrial scientific medical band and imaging as well as 60-GHz WLAN and 77-GHz radar applications can be implemented using UMC's process. VCOs are used in virtually all RF and wireless systems.

"UMC continues to provide the advanced process technologies that are used to power today's highest-performance applications," said Patrick T. Lin, chief system architect at UMC. "Compared to other technologies used in producing these types of circuits, CMOS delivers the best combination of high performance with low power and low cost for high-volume applications. This latest achievement with the University of Florida demonstrates in working silicon that our RFCMOS process technology is readily able to support very high frequency designs."

"Developing ICs of this caliber in 0.13um CMOS is a huge milestone," said Professor Kenneth O from the University of Florida. "If we incorporate frequency doubling techniques, we should be able to generate signals with frequencies of 200 GHz and higher. This has the potential to open up far-infrared to CMOS. UMC's role in our development was pivotal as this leading foundry provided the process and parameters that brought the chip to silicon quickly and easily."

The 105-GHz VCO utilizes a cross-coupled NMOS transistor core. The transistor structure of the LC resonator-based VCO chip has been optimized to reduce parasitic capacitances, which limits the maximum operating frequency. An accumulation mode MOS varactor has been optimized to achieve Q values of approximately 6 at 105 GHz or approximately 630 at 1 GHz, which is critical for achieving low power consumption and reducing noise. The 99-GHz VCO core consumes 15 mW. The phase noise at 10-MHz offset from the carrier varies between -101 to -103 dBc/Hz over the 2.4-GHz tuning range. The circuits were developed with the support of Darpa and announced at the 2005 VLSI Symposium on Circuits in a paper authored by Chang-Hua Cao, Ph.D candidate at the University, and Kenneth O. For more information on the VCO, contact Kenneth O at kko@tec.ufl.edu or UMC at foundry@umc.com.

UMC (NYSE: UMC, TSE: 2303) is a leading global semiconductor foundry that manufactures advanced process ICs for applications spanning every major sector of the semiconductor industry. UMC delivers cutting-edge foundry technologies that enable sophisticated system-on-chip (SoC) designs, including 90nm copper, 0.13um copper, and mixed signal/RFCMOS. UMC is also a leader in 300mm manufacturing; Fab 12A in Taiwan and Singapore-based Fab 12i are both in volume production for a variety of customer products. UMC employs approximately 10,500 people worldwide and has offices in Taiwan, Japan, Singapore, Europe, and the United States. UMC can be found on the web at http://www.umc.com.

Some of the statements in the foregoing announcement are forward looking within the meaning of the U.S. Federal Securities laws, including statements about future outsourcing, wafer capacity, technologies, business relationships and market conditions. Investors are cautioned that actual events and results could differ materially from these statements as a result of a variety of factors, including conditions in the overall semiconductor market and economy; acceptance and demand for products from UMC; and technological and development risks.

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