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Low phase noise on-chip oscillator for implantable biomedical applications
, Article Proceedings - IEEE International Symposium on Circuits and Systems ; 2011 , Pages 213-216 ; 02714310 (ISSN) ; 9781424494736 (ISBN) ; Atarodi, M ; Saeedi, S ; Sharif University of Technology
Abstract
On-chip accurate clock references are one of the essential building blocks in fully integrated Systems-On-Chips (SOC). In this paper, a low phase noise, temperature and supply voltage independent clock reference is presented. It provides the reference frequency for a biomedical implantable system. The simulated phase noise at 100 KHz offset from 2MHz carrier is 113dBc/Hz. Simulations show the frequency remains within 0.34% of the nominal oscillation frequency in the operating voltage range of 1.7 - 1.9 V without any calibration and its change in the temperature range of 20-to100C is 0.5%. The circuit consumes 77W and is designed in a 0.18m technology with 1.8V supply voltage
Prevention of distribution network overvoltage by adaptive droop-based active and reactive power control of PV systems
, Article Electric Power Systems Research ; Volume 133 , 2016 , Pages 313-327 ; 03787796 (ISSN) ; Parniani, M ; Sharif University of Technology
Elsevier Ltd
Abstract
Proliferation of grid-connected photovoltaic systems (PVSs) causes technical problems due to their variable and non-dispatchable generated power. High penetration of PVS in distribution networks can result in overvoltage in some operating conditions. Although this situation occurs rarely, it limits the installed capacity of PVS. In this paper, adaptive droop-based control algorithms are presented to regulate active and reactive power of PVS, with the objectives of loss minimization and increasing the PVS capacity installation without unallowable overvoltage. Operating voltage range of the PVS is divided into several intervals, and a specific control algorithm is presented for each of them....