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Increasing BIOS Trust in Personal Computers Using Reconfigurable Devices
, M.Sc. Thesis Sharif University of Technology ; Bayat Sarmadi, Siavash (Supervisor)
Abstract
Due to the expansion of digital system threats, trusted computation with a new approach for countering such threats has emerged. This approach is based on using a hardware module for implementing a trusted platform (TPM). TPM includes a chipset and the trusted systems core. Nowadays many of mobile computers do include this technology. This hardware creates trust using a trust chain and expanding this trust to other parts of the system. The starting point in this chain is the computer BIOS. BIOS is the first code that the system usually executes. One of the most powerful recent attacks on computer systems is to infect the BIOS and other firmware. One of such complicated attacks is the rootkit...
A four bit low power 165MS/s flash-SAR ADC for sigma-delta ADC application
, Article IEEE International Conference on Electronics, Circuits, and Systems, 6 December 2015 through 9 December 2015 ; Volume 2016-March , 2016 , Pages 153-156 ; 9781509002467 (ISBN) ; Khorami, A ; Eslampanah Sendi, M. S ; Hajsadeghi, K ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
A low power four bit mixed Successive Approximation Register (SAR)-Flash Analog to Digital Converter (ADC) for Sigma-Delta ADC applications is presented. The ADC uses three comparators in order to reduce the latency of typical SAR ADCs. Three comparators are used for conversion of 2 bits per one clock cycle. One of the Digital to Analog Converters (DACs) is replaced by three resistors which can save power and area. The ADC is simulated by Cadence Spectre using TSMC 0.18um COMS technology. The power consumption at 165MS/s and 1.8V supply voltage is 1.8mW. The SNDR and SFDR for 10MHz input are 19.8dB and 28.4dB, respectively
Stem Cell Culture in Bioreactor
, M.Sc. Thesis Sharif University of Technology ; Abdekhodaie, Mohammad Jafar (Supervisor) ; Ebrahimi, Marziye (Supervisor) ; Yaghmaei, Soheyla (Co-Advisor)
Abstract
Static culture systems, such as well-plates, T-Flasks and gas-permeable blood bags are restricted by their limited number of hematopoietic stem cells (HSCs) available. Hence, stirred culture systems are alternative options due to their appropriate culture conditions. Ex-vivo expansion of HSCs in suspension bioreactors has been successfully developed in recent years. The purpose of this study is comparing HSCs expansion in bioreactor with reciprocating impeller and static culture, investigation the effect of rotational speed changes in suspension culture on HSCs expansion and comparing the expansion potential of static and suspension cultures with rotational movement.
Expansion of...
Expansion of...
Temperature compensation in CMOS peaking current references
, Article IEEE Transactions on Circuits and Systems II: Express Briefs ; Volume 65, Issue 9 , 2018 , Pages 1139-1143 ; 15497747 (ISSN) ; Kananian, S ; Sharifkhani, M ; Sodagar, A. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
In this brief, modifications to the peaking current reference with MOS transistors operating in the subthreshold and the strong inversion region has been proposed by means of which very small currents with immunity to temperature variations on a chip can be obtained. Temperature compensation can be done by adding a source degeneration resistor to the conventional peaking current source structure. Design examples are provided for both weak and strong inversion operations with output currents of 1.5 μA and 40 μ A with less than 4% and 10% variation over the span of-40 °C to +100 °C, respectively. A prototype of the circuit operating in the weak and strong inversion region is designed,...
Wireless interfacing to cortical neural recording implants using 4-FSK modulation scheme
, Article IEEE International Conference on Electronics, Circuits, and Systems, 6 December 2015 through 9 December 2015 ; Volume 2016 March , 2016 , Pages 221-224 ; 9781509002467 (ISBN) ; Judy, M ; Molaei, H ; Sodagar, A. M ; Sharifkhani, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
This paper used a 4-level frequency shift keying (4-FSK) modulation scheme to enhance the density of wireless data transfer from implantable biomedical microsystems to the outside world. Modeling and simulation of the wireless channel for 4-FSK modulation in the case of a neural recording implant has been done. To realize the 4-FSK scheme, the modulator and demodulator circuits are proposed, designed and simulated in a 0.18-μm CMOS process, and in the 174-216 MHz frequency band at a data rate of 13.5 Mbps. Operated using a 1.8 V supply voltage, the modulator circuit consumes a power of 7.8 μW
A low-power temperature-compensated CMOS peaking current reference in subthreshold region
, Article Proceedings - IEEE International Symposium on Circuits and Systems, 28 May 2017 through 31 May 2017 ; 2017 ; 02714310 (ISSN) ; 9781467368520 (ISBN) ; Kananian, S ; Zendehrouh, E ; Sharifkhani, M ; Sodagar, A. M ; Shabany, M ; Sharif University of Technology
2017
Abstract
In this paper, a new method to achieve very small current reference levels on integrated circuits with immunity to temperature variations using peaking current source with MOSFETs operating in subthreshold region is proposed. By adding a source degeneration resistor to the conventional peaking current source architecture, a zero temperature coefficient current can be generated. The proposed low-power circuit operating in the weak inversion region is designed, simulated, and fabricated in a 0.18-μm standard CMOS process. Measurement results verify the circuit operation with about 5% variation over the span of -40° C to +100° C (industrial temperature grade). The supplied current is designed...
Design of a Non-Bianry Analog to Digital Converterfor Impantable Neural Recording Microsystem
, M.Sc. Thesis Sharif University of Technology ; Sharifkhani, Mohammad (Supervisor) ; Sodagar, Amir Masoud (Supervisor)
Abstract
A new structure of implantable neural recording microsystem base on multiple valued logic (MVL) has been proposed. MVL is a new idea for reduction of occupied area and the power consumption of microelectronic. In another side, in implantable microsystems , occupied area and power consumption by this type of micro systems is a challenging problem in this field. Therefore, the problem of power consumption and occupied area can introduce as a prime stage of suggested microsystem completed design of convertor of analog to digital in usage of multiple level in this micro system worked. Design of convertor of analog to digital is a convertor of quaternary successive approximation. And also,...