Today, I would like to introduce an invention related to September 5. What I will introduce this time is dynamic random-access memory (DRAM) devised by American electronical engineer and inventor Robert H. Dennard (1932.9.5 ~). Today, September 5th, is his 89th birthday.
DRAM is a type of semiconductor memory. It has the disadvantage of constantly consuming power for refreshing (memory retention operation) because information is lost when it is discharged, but it is widely used in computers’ main storage devices, digital televisions, and digital cameras, etc. due to its large capacity and low cost.
Currently, all the main storage devices of computers are DRAM. In recent years, DRAMs that specialize in low power consumption have also appeared.
The DRAM we use every day was conceived by Dennard in 1966 at IBM Thomas J. Watson Research Center. The following year of 1967, a patent application was filed, and it was registered in 1968 (US3387286A). Dennard also won the Kyoto Prize in 2013.
By the way, IBM Thomas J. Watson Research Center is a research division of IBM. In addition to Dennard, it is known that many prominent scientists such as Benoit Mandelbrot in mathematics and Leo Esaki in physics also worked there.
Related Link: Robert H. Dennard – Wikipedia