Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292321
E. Shami, H. Shamsi
An accurate bandgap voltage reference (BVR) which utilizes the thermal behavior of the threshold voltage and electron mobility of NMOS transistors is presented in this paper. The circuit is based on a well-known addition of a proportional to absolute temperature (PTAT) and complementary to absolute temperature (CTAT) references. The PTAT circuit uses the temperature coefficient (TC) of the electron mobility and the CTAT circuit uses the TC of the threshold voltage to generate accurate PTAT and CTAT currents. The circuit is designed in a 0.18μm CMOS technology. Simulation results show a temperature coefficient (TC) of 3ppm and power supply rejection ratio (PSRR) of 77dB at DC frequency.
{"title":"A 3-ppm/°C bandgap voltage reference using MOSFETs in strong inversion region","authors":"E. Shami, H. Shamsi","doi":"10.1109/IRANIANCEE.2012.6292321","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292321","url":null,"abstract":"An accurate bandgap voltage reference (BVR) which utilizes the thermal behavior of the threshold voltage and electron mobility of NMOS transistors is presented in this paper. The circuit is based on a well-known addition of a proportional to absolute temperature (PTAT) and complementary to absolute temperature (CTAT) references. The PTAT circuit uses the temperature coefficient (TC) of the electron mobility and the CTAT circuit uses the TC of the threshold voltage to generate accurate PTAT and CTAT currents. The circuit is designed in a 0.18μm CMOS technology. Simulation results show a temperature coefficient (TC) of 3ppm and power supply rejection ratio (PSRR) of 77dB at DC frequency.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115132794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292383
H. Radmanesh, H. Fathi, S. U. Mosazade, H. Hosseinian
This paper studies the effect of iron core saturation characteristic degree on the occurrence of harmonic modes in an autotransformer. The selected transformer for study has a rating of 50 MVA, 635.1 kV. The magnetization characteristic index of the autotransformer is chosen with q=5, 7, 11. The linear core loss is considered for transformer core. The MATLAB software is used for analyzing existence harmonic modes in the proposed power system. It is shown high order harmonics are occurred when degree of core nonlinearity is gone from 5 to 11.
{"title":"Harmonics analysis in autotransformers ferroresonance circuit","authors":"H. Radmanesh, H. Fathi, S. U. Mosazade, H. Hosseinian","doi":"10.1109/IRANIANCEE.2012.6292383","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292383","url":null,"abstract":"This paper studies the effect of iron core saturation characteristic degree on the occurrence of harmonic modes in an autotransformer. The selected transformer for study has a rating of 50 MVA, 635.1 kV. The magnetization characteristic index of the autotransformer is chosen with q=5, 7, 11. The linear core loss is considered for transformer core. The MATLAB software is used for analyzing existence harmonic modes in the proposed power system. It is shown high order harmonics are occurred when degree of core nonlinearity is gone from 5 to 11.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114551159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292485
L. Khoshnevisan, S. Ozgoli, M. Shojaei
Robust fault detection filter (RFDF) is mainly designed to detect faults in linear time-invariant (LTI) systems inherently exposed to external disturbances. H-index norm technique is one of the RFDF designing methods. The main idea of our study is to apply a continuous H-index method to a real boiler model which is made proper by adding an auxiliary direct channel. A high pass filter is augmented to raise the high frequency response. The H-index norm is maximized to distinguish between external disturbance and fault. The designed RFDF is continuous and can directly be implemented to the time-domain original continuous model. Furthermore, discretizing the continuous model may cause losing some information. Finally, the designed method is theoretically applied in a simulated model of a drum boiler operating in Synvendska Kraft AB Plant in Malmo, Sweden as a multivariable and strongly coupled system. It is illustrated that both sensor and actuator faults can robustly be detected as quickly as possible. To the best of authors' knowledge, this is the first time that the continuous H-index norm procedure is employed to detect actuator and sensor faults in a boiler model.
{"title":"An ILMI approach to robust fault detection filter for a drum boiler system through a time-domain H-index norm method","authors":"L. Khoshnevisan, S. Ozgoli, M. Shojaei","doi":"10.1109/IRANIANCEE.2012.6292485","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292485","url":null,"abstract":"Robust fault detection filter (RFDF) is mainly designed to detect faults in linear time-invariant (LTI) systems inherently exposed to external disturbances. H-index norm technique is one of the RFDF designing methods. The main idea of our study is to apply a continuous H-index method to a real boiler model which is made proper by adding an auxiliary direct channel. A high pass filter is augmented to raise the high frequency response. The H-index norm is maximized to distinguish between external disturbance and fault. The designed RFDF is continuous and can directly be implemented to the time-domain original continuous model. Furthermore, discretizing the continuous model may cause losing some information. Finally, the designed method is theoretically applied in a simulated model of a drum boiler operating in Synvendska Kraft AB Plant in Malmo, Sweden as a multivariable and strongly coupled system. It is illustrated that both sensor and actuator faults can robustly be detected as quickly as possible. To the best of authors' knowledge, this is the first time that the continuous H-index norm procedure is employed to detect actuator and sensor faults in a boiler model.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115083876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292395
T. S. Attar, S. Mahdavi, J. Saebi, M. H. Javidi
Smart transmission grid developments in Iran bring forward new requirements and challenges for the national power system. Regarding to Iranian smart transmission grid roadmap, the activities performed to implement it in Khorasan Regional Electricity Company are listed in this paper.
{"title":"Implementations of smart transmission grid in Iran (case study: Khorasan Regional Electricity Company)","authors":"T. S. Attar, S. Mahdavi, J. Saebi, M. H. Javidi","doi":"10.1109/IRANIANCEE.2012.6292395","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292395","url":null,"abstract":"Smart transmission grid developments in Iran bring forward new requirements and challenges for the national power system. Regarding to Iranian smart transmission grid roadmap, the activities performed to implement it in Khorasan Regional Electricity Company are listed in this paper.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116786745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292370
N. Seraji, M. Yavari
In this paper a switched-capacitor (SC) interface circuit that is intended for MEMS capacitive sensors is proposed and designed. In the proposed architecture, both correlated double sampling (CDS) and chopper stabilization (CHS) noise reduction techniques are applied to the interface circuit to reduce the amplifier offset and low frequency noise. The effects of parasitic capacitances between the sensor and its interface circuit which are usually larger than the sense capacitances are carefully analyzed and used to optimize the readout performance. In other words, by analyzing the circuit offset and noise performance in presence of these parasitic capacitances, the suitable values of the circuit parameters such as sampling frequency, chopping frequency, and amplifier unity gain bandwidth are calculated. In comparison to the circuit using only CDS or CHS technique, the resolution variation of the proposed readout circuit is less than 1aF in presence of parasitic capacitances varying up to 20 pF.
{"title":"On the design and optimization of a switched-capacitor interface circuit for MEMS capacitive sensors","authors":"N. Seraji, M. Yavari","doi":"10.1109/IRANIANCEE.2012.6292370","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292370","url":null,"abstract":"In this paper a switched-capacitor (SC) interface circuit that is intended for MEMS capacitive sensors is proposed and designed. In the proposed architecture, both correlated double sampling (CDS) and chopper stabilization (CHS) noise reduction techniques are applied to the interface circuit to reduce the amplifier offset and low frequency noise. The effects of parasitic capacitances between the sensor and its interface circuit which are usually larger than the sense capacitances are carefully analyzed and used to optimize the readout performance. In other words, by analyzing the circuit offset and noise performance in presence of these parasitic capacitances, the suitable values of the circuit parameters such as sampling frequency, chopping frequency, and amplifier unity gain bandwidth are calculated. In comparison to the circuit using only CDS or CHS technique, the resolution variation of the proposed readout circuit is less than 1aF in presence of parasitic capacitances varying up to 20 pF.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117011369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292517
A. Pirsiavash, S. Salari, S. Ghadrdan
In this paper we considered a non-redundant linear precoding blind channel estimation method for orthogonal frequency-division multiplexing (OFDM) system and proposed an improved algorithm to achieve better performance. A wide range of blind channel estimation methods are based on the covariance matrix of received symbols. In practice, the covariance matrix is unknown and must be estimated through time averaging over received OFDM blocks. To this end, the unknown channel must remain time invariant through the averaging process. Therefore the number of averaging steps is finite and the way of using the covariance matrix components is important in practical applications. In this paper, we propose a new algorithm by an efficient use of covariance matrix components. Simulation results show the proposed method improvement over the other blind estimation methods.
{"title":"Blind channel estimation for OFDM systems using all entries of covariance matrix","authors":"A. Pirsiavash, S. Salari, S. Ghadrdan","doi":"10.1109/IRANIANCEE.2012.6292517","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292517","url":null,"abstract":"In this paper we considered a non-redundant linear precoding blind channel estimation method for orthogonal frequency-division multiplexing (OFDM) system and proposed an improved algorithm to achieve better performance. A wide range of blind channel estimation methods are based on the covariance matrix of received symbols. In practice, the covariance matrix is unknown and must be estimated through time averaging over received OFDM blocks. To this end, the unknown channel must remain time invariant through the averaging process. Therefore the number of averaging steps is finite and the way of using the covariance matrix components is important in practical applications. In this paper, we propose a new algorithm by an efficient use of covariance matrix components. Simulation results show the proposed method improvement over the other blind estimation methods.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123482590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292314
R. Fani, E. Farshidi
This paper presents a new fully differential current controlled conveyor (FDCCCII) based on differential pair topology, which employs floating gate MOS transistors (FG-MOS). It uses floating gate MOSFETs at the input stage and has rail to rail structure. It operates with low supply voltage (±0.8v), low power consumption (lower than 600μw), and with wide range parasitic resistance (Rx). Simulation results by Hspice confirm validity of the proposed circuit.
{"title":"A new fully differential second generation current controlled convey or using FG-MOS","authors":"R. Fani, E. Farshidi","doi":"10.1109/IRANIANCEE.2012.6292314","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292314","url":null,"abstract":"This paper presents a new fully differential current controlled conveyor (FDCCCII) based on differential pair topology, which employs floating gate MOS transistors (FG-MOS). It uses floating gate MOSFETs at the input stage and has rail to rail structure. It operates with low supply voltage (±0.8v), low power consumption (lower than 600μw), and with wide range parasitic resistance (Rx). Simulation results by Hspice confirm validity of the proposed circuit.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123499197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292579
S. Mohammad, J. Nourinia, C. Ghobadi, M. Majidzadeh
A simple compact printed slot antenna fed by coplanar waveguide (CPW) with a pair of parasitic patches that are added in back side of antenna is presented. By embedding an H-shaped strip to the feed line and symmetrical inverted L-shaped strips that are connected to the H-shaped strip, the impedance matching has improved and the bandwidth (BW) is extremely enhanced. The total size of the antenna is 25×25×1mm3 and operates over the frequency range of 3-15.5GHz. For the fabricated antenna, omni-directional pattern is observed over the whole UWB frequency range.
{"title":"A novel compact CPW-fed slot antenna with a pair of parasitic patches for UWB applications","authors":"S. Mohammad, J. Nourinia, C. Ghobadi, M. Majidzadeh","doi":"10.1109/IRANIANCEE.2012.6292579","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292579","url":null,"abstract":"A simple compact printed slot antenna fed by coplanar waveguide (CPW) with a pair of parasitic patches that are added in back side of antenna is presented. By embedding an H-shaped strip to the feed line and symmetrical inverted L-shaped strips that are connected to the H-shaped strip, the impedance matching has improved and the bandwidth (BW) is extremely enhanced. The total size of the antenna is 25×25×1mm3 and operates over the frequency range of 3-15.5GHz. For the fabricated antenna, omni-directional pattern is observed over the whole UWB frequency range.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123578259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292340
V. Qaradaghi, V. Ahmadi, G. Abaeiani
We investigate the impact of optical excitation in organic vertical cavity surface emitting laser (OVCSEL) to achieve lasing condition. Our simulation shows that for the optical excitation case, triplet excitons quench singlet excitons largely when we apply constant input optical pump. Also we show that for wide pulses, we can use low input pump power, but, lasing time will be delayed. Finally, we can optimise our structure to get lasing threshold for low input optical pump. Reaching low threshold lasing under optical injection enables us to get lasing under electrical injection.
{"title":"Analysis of low threshold organic vertical cavity surface emitting laser under optical excitation","authors":"V. Qaradaghi, V. Ahmadi, G. Abaeiani","doi":"10.1109/IRANIANCEE.2012.6292340","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292340","url":null,"abstract":"We investigate the impact of optical excitation in organic vertical cavity surface emitting laser (OVCSEL) to achieve lasing condition. Our simulation shows that for the optical excitation case, triplet excitons quench singlet excitons largely when we apply constant input optical pump. Also we show that for wide pulses, we can use low input pump power, but, lasing time will be delayed. Finally, we can optimise our structure to get lasing threshold for low input optical pump. Reaching low threshold lasing under optical injection enables us to get lasing under electrical injection.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125075867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-05-15DOI: 10.1109/IRANIANCEE.2012.6292448
V. Mehrdad, H. Ebrahimnezhad
This paper presents the usage of linear prediction coding (LPC) coefficients as descriptor for 3D shape retrieval. In this approach, early shape is projected to the lateral surface of a cylinder parallel to main principal axes and centered at the centroid of the 3D object. For each projected shape, we extract the two-dimensional linear prediction coding coefficients. Rotation normalization is performed by employing the principal component analysis. Resulting descriptor is robust against rotation, translation and scaling. Experimental results demonstrate the effectiveness of the proposed descriptor compared with other methods.
{"title":"3D model retrieval using linear prediction coding descriptor","authors":"V. Mehrdad, H. Ebrahimnezhad","doi":"10.1109/IRANIANCEE.2012.6292448","DOIUrl":"https://doi.org/10.1109/IRANIANCEE.2012.6292448","url":null,"abstract":"This paper presents the usage of linear prediction coding (LPC) coefficients as descriptor for 3D shape retrieval. In this approach, early shape is projected to the lateral surface of a cylinder parallel to main principal axes and centered at the centroid of the 3D object. For each projected shape, we extract the two-dimensional linear prediction coding coefficients. Rotation normalization is performed by employing the principal component analysis. Resulting descriptor is robust against rotation, translation and scaling. Experimental results demonstrate the effectiveness of the proposed descriptor compared with other methods.","PeriodicalId":308726,"journal":{"name":"20th Iranian Conference on Electrical Engineering (ICEE2012)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129445654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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