Helge O Granberg

Title: Helge O Granberg: Innovator in RF Transformer Technology

Introduction

Helge O Granberg is a notable inventor based in Phoenix, AZ (US), recognized for his contributions to the field of radio frequency (RF) technology. With a total of 4 patents to his name, Granberg has made significant advancements in the design and functionality of RF transformers and power amplifier circuits.

Latest Patents

One of Granberg's latest patents is for a broadband RF transformer. This design facilitates the construction of a broadband impedance transformer in a compact, planar format, while retaining ease of assembly and manufacture. Broadband operation is achieved through the use of a slotted low-impedance winding structure, common-manufacture ferrite elements, and the optional placement of reactive elements between winding turns. The construction enhances thermal performance, allowing operation at power levels not previously possible. Additionally, the invention accommodates functional tuning via laser or abrading techniques, and the winding configuration eliminates the need to access the center of a spiral for establishing a ground connection.

Another significant patent involves an apparatus and method for paralleling power field effect transistors in switching power amplifier circuits. These circuits operate within a frequency range from 0.5 MHz to 100 MHz and utilize power field effect transistor (FET) devices as output components. The FET devices are driven by bipolar transistor devices without frequency limiting components. The power amplifier circuits can be coupled in parallel and operated in a push-pull mode for increased power. This system can function in various modes, including Class A, B, C, D, E, F, and S, with a particular focus on a Class D amplifier system that extends the frequency range.

Career Highlights

Throughout his career, Granberg has worked with prominent companies such as Motorola Corporation and Signal One Corporation. His experience in these organizations has contributed to his expertise in RF technology and innovation.

Collaborations

Granberg has collaborated with notable individuals in the field, including Don P Roehrs and Lawrence F Cygan. These partnerships have likely influenced his work and contributed to his success as an inventor.

Conclusion

Helge O Granberg's innovative work in RF transformer technology and power amplifier circuits showcases his significant contributions to the field. His patents reflect a commitment to advancing technology and improving performance in electronic systems.