1958: A high-Q
voltage-sensitive variable capacitor was developed with controllable and
reproducible properties. This
device is described in patent 2,989,671, for which I am listed as
co-inventor. It was named the
Varicap and sold commercially by
1959: As transistor
technology development continued at PSI in 1959, a new approach to increase
the high frequency characteristics of transistors was the development of
the triple diffused mesa transistor.
This device incorporated a diffused collector region, diffused
emitter and base layers, and gold metalized contacts. Since planar technology had not been
invented yet, these devices were separated by etched moats.
1959: By this time, PSI had many
state-of-the-art devices in production.
A brochure from that timeframe contained such products as Fast
recovery Silicon Diffusion Computer Diodes, Zener Diodes, Plastic
Encapsulated Assemblies, Non-Linear resistors, Silicon General Purpose
Diodes, Silicon High Conductance Diodes, Varicap Voltage-Variable
Capacitors, Very High Frequency Silicon Power Transistors, Silicon High
Voltage Rectifiers, and Silicon Very High Voltage Cartridge Rectifiers
To Barnes Oral History, Page 6