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A Scan Chain-Based Aging Monitoring Scheme for Detection of Recycled Chips
, M.Sc. Thesis Sharif University of Technology ; Hesabi, Shahin (Supervisor)
Abstract
Today's latest technology integrated circuits are manufactured for a wide range of applications. With the constant increase in the usage rate of integrated circuits, designing a high reliable system is of utmost importance. The avoidance of counterfeit components is a major challenge of hardware security and trust. Counterfeit components cause lower performance and reduced life span. They are of great concern to the manufacturers and consumers of electronic systems, impacting the security and reliability of these systems. If these parts end up in critical applications like medical systems, satellites, aerospace, or power plants, the results could be catastrophic. So far, there are different...
A subthreshold dynamic read SRAM (DRSRAM) based on dynamic stability criteria
, Article Proceedings - IEEE International Symposium on Circuits and Systems ; 2011 , Pages 61-64 ; 02714310 (ISSN) ; 9781424494736 (ISBN) ; Sharifkhani, M ; Hajsadeghi, K ; Sharif University of Technology
Abstract
This paper introduces a Dynamic Read SRAM (DRSRAM) architecture for high-density subthreshold RAM applications. DRSRAM performs a dynamic read operation to overcome the poor stability and bitline leakage problem of 6T SRAM cell in sub-threshold region. It is shown that there is fundamental limit for wordline activation time and recovery time under a given cell mismatch and bitline leakage. To verify the proposed technique, a 64128 bit array of the 6T bit-cell is simulated in 90 nm CMOS technology. The simulation results show a 100% noise margin enhancement at subthreshold region. This design operates down to 300 mV at a 1 MHz clock rate with noise margins as large as 72 mV. This design...
A new UWB pulse generator for narrowband interference avoidance
, Article Proceedings of the Mediterranean Electrotechnical Conference - MELECON, 25 April 2010 through 28 April 2010 ; April , 2010 , Pages 759-763 ; 9781424457953 (ISBN) ; Jalili, A ; Fotowat Ahmady, A ; Nezhad, A.Z ; Hedayati, H ; Sharif University of Technology
2010
Abstract
In this paper a new IR-UWB pulse generator circuit is proposed which is capable of solving the coexistence problem of narrowband and ultra wideband communication systems. This is done by creating a notch in the PSD of the generated UWB signal and adjusting its center frequency at the frequency of the narrowband interference. Using a triangular pulse generator, a triangular signal is generated and applied to the proposed circuit which consists of three main function blocks including quadratic, exponential and differentiator circuits. A differential pair MOS transistors in sub threshold region is utilized in order to realize the exponential block. The circuit is designed using a 0.18-μm RF...