Hannu O Ronkainen

Title: Hannu O Ronkainen: Innovator in Bipolar Transistor Technology

Introduction

Hannu O Ronkainen is a notable inventor based in Espoo, Finland. He has made significant contributions to the field of semiconductor technology, particularly in the design of bipolar transistors. His innovative approach has led to advancements that enhance the performance of integrated circuits.

Latest Patents

Ronkainen holds a patent for a bipolar transistor with a ring emitter. This invention features a novel ring-shaped emitter structure with an extrinsic base and base contact located in the central portion of the ring. The design aims to improve the performance of bipolar transistors used in BiCMOS integrated circuits while requiring only minimal changes to conventional CMOS processing technology. The configuration allows for a single additional mask to form the intrinsic base region of the transistor. The emitter is diffused from a polysilicon layer that also serves as the emitter contact. This innovative design results in a ring along the perimeter of the active region, enhancing transistor performance by reducing characteristic spacings, component resistances, and capacitances, ultimately increasing the cut-off frequency.

Career Highlights

Hannu O Ronkainen is associated with Tritech Microelectronics International Ltd., where he applies his expertise in semiconductor technology. His work focuses on developing advanced solutions that contribute to the efficiency and effectiveness of electronic components.

Conclusion

Hannu O Ronkainen's contributions to bipolar transistor technology exemplify the impact of innovative design in the semiconductor industry. His patent for a ring emitter structure represents a significant advancement that enhances the performance of BiCMOS integrated circuits.