FIVE-TRANSISTOR SINGLE-PORT SRAM BIT CELL WITH HIGH SPEED AND LOW STANDBY CURRENT
Chien-Cheng Yu1,3*, Ming-Chuen Shiau2, and Ching-Chih Tsai3
1&2Department of Electronic Engineering, Hsiuping University of Science and Technology,Taichung City, Taiwan
3Department of Electrical Engineering, National Chung Hsing University Taichung City, Taiwan
ABSTRACT
In this paper, a new five-transistor (5T) single-port Static Random Access Memory (SRAM) cell with voltage assist is proposed. Amongst them, a word line suppression circuit is designed to provide a voltage of the respective connected word line signal in a selected row cells lower than the power supply voltage VDD by a threshold voltage during a read operation, thereby to improve the read/write-ability of the cell. In addition, a voltage control circuit is coupled to the sources corresponding to driver transistors of each row memory cells. This configuration is aimed to control the source voltages of driver transistors under different operating modes. Specifically, during a read operation, a two-stage reading mechanism is engaged to increase the reading speed. Simulation results for the proposed cell design confirm that there is a conspicuous improvement in reading speed and power saving over the conventional SRAM cells, and fast writing also can be achieved.
KEYWORDS
Single-port, Static random access memory, Assist circuitry, Voltage control circuit, Standby start-up circuit
Original Source Link : http://aircconline.com/vlsics/V9N4/9418vlsi01.pdf
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