Blöhbaum Frank

altFrank Blöhbaum was born and grew up in the former East Germany, in Leipzig. He build his first tube radio at age 14 and managed to sell his first tube amp at 16. He earned his masters in electronics and semiconductor physics from the Ilmenau Technical University in 1986. Frank worked for 24 years as a design engineer in the fields of optics, opto-electronics, space systems, and sensor- and measurement systems. His special field of expertise is in Lidar Time-of Flight-systems and 3D cameras, analog and digital signal processing, optoelectronics and ultrasonic sensors. He currently heads the fundamental Research Group as well as the Analog Design Working Group at a large (5000+ employees) corporation. Mr. Blöhbaum has more than 20 patents granted in the fields of optoelectronics and amplifiers and sensor systems. He designed and organized the production of the award-winning Thorens TEM 3200 power amp and TEP 3800 preamp, based on his patented floating balanced amplifier concept. He also designed and organized the production of the class-AB T.A.C V-60 power amp, based on his BiasWizard® automatic bias regulation.

Multiplied Transconductance Amplifiers Part I Vol 6
Frank Blöhbaum

In the heydays of AM radio receivers some tubes were produced having up to 6 grids, called octodes. These tubes can be arranged as a triode and a hexode in a common bulb, with a common cathode. Frank Blöhbaum, never afraid to explore unusual (some would say crazy) topologies, combined a cascoded non-inverting triode section with a common grounded cathode stage to arrive at what is called a Multiplied Transconductance Stage. This article explores MTA topologies with real-life measurements, feedback arrangements and design guidelines for line-level and low-power MTA amplifiers. A future article will focus on MTAs for higher power applications.

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