Invention Grant
- Patent Title: DRAM cell circuit
- Patent Title (中): DRAM单元电路
-
Application No.: US09692118Application Date: 2000-10-19
-
Publication No.: US06362502B1Publication Date: 2002-03-26
- Inventor: Wolfgang Rösner , Thomas Schulz , Lothar Risch , Franz Hofmann
- Applicant: Wolfgang Rösner , Thomas Schulz , Lothar Risch , Franz Hofmann
- Priority: DE19950362 19991019
- Main IPC: H01L27108
- IPC: H01L27108

Abstract:
A memory cell contains a memory transistor and a transfer transistor. A gate electrode of the transfer transistor and a control gate electrode of the memory transistor are connected to a word line. The memory transistor has a floating gate electrode that is isolated from a channel region of the memory transistor by a first dielectric layer and is connected to a first source/drain region of the transfer transistor. The control gate electrode is isolated from the floating gate electrode by a second dielectric layer. A first source/drain region of the memory transistor is connected to a bit line. The memory and transfer transistors are preferably of different conductivity types. During the writing of information, the transfer transistor is in the on-state and the memory transistor is in the off-state. During the reading-out of information, the transfer transistor is in the off-state and the memory transistor is in the on-state.
Information query