Who invented sdram

That year, his research team was working on field-effect transistors FETs and integrated circuits, using the then standard six-transistor memory cell for each bit of data. After an in-house presentation by a rival IBM team piqued his sense of competition, Dennard set out to streamline the memory cells that he was working on.

At that time, RAM was a known and used concept: memory reserved for writing to and reading from in a temporary fashion, to be erased every time the computer is turned off. However, in the mids RAM required an elaborate system of wires and magnets that was bulky and power hungry, negating in practice RAM's theoretical efficiency.

Magnetic memory was, in effect, quite expensive as well. Dennard's revolutionary achievement was to reduce RAM to a memory cell with only a single transistor. Konrad Zuse completed the Z22, the seventh computer model and the first computer that used magnetic storage memory. MIT introduced the Whirlwind machine on March 8, , a revolutionary computer that was the first digital computer with magnetic core RAM. An Wang was issued U.

Bell Labs introduced its first transistor computer. Transistors are faster, smaller, and create less heat than traditional vacuum tubs , making these computers more reliable and efficient.

Kenneth Olsen was issued U. SDRAM was able to reach higher speeds than its predecessor and achieved this by synchronizing itself with the computer's clock. There, a capacitor, found within, stores the data. This data is represented in binary value by either an electrical charge or discharge.

DRAM is what's known as a volatile memory, meaning that all data is lost when power is taken away. This circuit maintains the electrical charge, ensuring data is not lost. DRAM is known mostly for being an affordable, high capacity format used in a wide variety of devices.

This results in a sort of physical lock to prevent any attempt to use an older DIMM in a newer socket or vice versa. While it is still a volatile memory, this means that SRAM is static, and more easily holds on to data. Now that the types of RAM in the market have been elucidated, it is just as important to understand who manufacturers and controls the market.

Samsung controls roughly 60 percent of the DRAM market, with Hynix and Micron controlling, in total, about 36 percent. However, these companies also carry with them a great deal of controversy.

In view of it large volume use of SDRAM, development is always on-going to ensure that performance stays up with the requirements. SDRAM DDR4 was latest that has been launched, and development is on-going as there is a huge need for ever more effective forms of semiconductor memory.

It is synchronised to the clock of the processor and hence to the bus With SDRAM having a synchronous interface, it has an internal finite state machine that pipelines incoming instructions. It has now been superseded by the other types below. This is achieved by transferring data twice per cycle. It provides further improvements in overall performance and speed. It was introduced in the latter half of The specification was launched in with expected first production in