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A Novel Model for the Resonance Frequency in Lamb Wave Resonators based on AlN 基于AlN的Lamb波谐振器谐振频率新模型
Latin American Symposium on Circuits and Systems Pub Date : 2019-02-01 DOI: 10.1109/LASCAS.2019.8667592
A. Alvarado, A. Torres-Jácome, F. Wade, E. Torres-Rios
{"title":"A Novel Model for the Resonance Frequency in Lamb Wave Resonators based on AlN","authors":"A. Alvarado, A. Torres-Jácome, F. Wade, E. Torres-Rios","doi":"10.1109/LASCAS.2019.8667592","DOIUrl":"https://doi.org/10.1109/LASCAS.2019.8667592","url":null,"abstract":"Current multiplexers, oscillators and active filters, commonly based on active devices, are fundamental components of any communication system, nevertheless, their performance is limited by the power consumption. Due to the high requirements in modern communication systems, the new topologies and the optimized design of each basic component must be a main issue to investigate. The piezoelectric resonators are passive devices that can replace some active components in oscillators and active filters. This work presents a novel model for the resonance frequency of any type of piezoelectric resonator. As a particular case, we use this in a Lamb Wave Resonator (LWR) with aluminum electrodes and Nitride Aluminum (AlN) as the piezoelectric layer. The experimental validation of the model was conducted using an LWR designed and fabricated at the INAOE’s facilities. The measured S parameters delivered a resonance frequency of 541 MHz; and this result was compared to that predicted by the proposed model, showing a relative error of 5.4%, which is much lower than the 18.8% obtained by using the standard design methodology.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122672555","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}
引用次数: 0
Biased capacitive divider electrostatic generators for energy harvesting 能量收集用偏置电容分压器静电发生器
Latin American Symposium on Circuits and Systems Pub Date : 2017-02-01 DOI: 10.1109/LASCAS.2017.7948045
A. Queiroz
{"title":"Biased capacitive divider electrostatic generators for energy harvesting","authors":"A. Queiroz","doi":"10.1109/LASCAS.2017.7948045","DOIUrl":"https://doi.org/10.1109/LASCAS.2017.7948045","url":null,"abstract":"A study is presented about some structures of electrical generators based on variable capacitors, suitable for energy harvesting applications, and compatible with construction as microelectromechanical systems. In the discussed structures, part of the generator has as function the generation of a high biasing voltage, and another part, a capacitive divider where one of the capacitors is variable, is used as the actual generator. It feeds a DC/DC converter that generates the useful output energy at low voltage. The structures add flexibility in the design over previously proposed generators based on Bennet's doubler, and allow greater output power.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124956924","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}
引用次数: 1
Pipelined SAR with comparator-based switch-capacitor residue amplification 基于比较器的开关电容残馀放大的流水线SAR
Latin American Symposium on Circuits and Systems Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451024
F. Sill, Pedro Henrique Kohler Marra Pinto
{"title":"Pipelined SAR with comparator-based switch-capacitor residue amplification","authors":"F. Sill, Pedro Henrique Kohler Marra Pinto","doi":"10.1109/LASCAS.2016.7451024","DOIUrl":"https://doi.org/10.1109/LASCAS.2016.7451024","url":null,"abstract":"This work presents the implementation of an 11 Bit pipelined successive approximation register ADC (PSAR) in a 65 nm technology. The proposed ADC utilizes comparator-based switch-capacitor circuits and zero-detection in order to enable fast and high linear residue amplification with at reasonable area costs. Simulation results indicate conversion rates of 4.4 MSPS and energy consumption of 48.8 fJ per step.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126505915","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}
引用次数: 0
A taxonomy for learning, teaching, and assessing wireless body area networks 用于学习、教学和评估无线体域网络的分类法
Latin American Symposium on Circuits and Systems Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451039
A. F. Jaimes, F. Sousa
{"title":"A taxonomy for learning, teaching, and assessing wireless body area networks","authors":"A. F. Jaimes, F. Sousa","doi":"10.1109/LASCAS.2016.7451039","DOIUrl":"https://doi.org/10.1109/LASCAS.2016.7451039","url":null,"abstract":"Wireless body area networks have recently gained attention, mainly after the IEEE 802.15.6 standard had been proposed. Reviewing the literature, we easily recognize that several authors use different terminologies for a single concept or a single terminology for different concepts. This generates confusion and blocks fair comparisons between systems. In this paper, we present an overview of Wireless Body Area Networks (WBAN) with focus on the applications. Moreover, we propose a detailed taxonomy that could help to disambiguate the confusion regarding current WBAN terminology.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115440212","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}
引用次数: 15
Simple expression for estimating the switch peak voltage on the class-E amplifier with finite DC-feed inductance 有限直流馈电电感的e类放大器开关峰值电压估计的简单表达式
Latin American Symposium on Circuits and Systems Pub Date : 2016-02-01 DOI: 10.1109/LASCAS.2016.7451040
A. F. Jaimes, F. Sousa
{"title":"Simple expression for estimating the switch peak voltage on the class-E amplifier with finite DC-feed inductance","authors":"A. F. Jaimes, F. Sousa","doi":"10.1109/LASCAS.2016.7451040","DOIUrl":"https://doi.org/10.1109/LASCAS.2016.7451040","url":null,"abstract":"The class-E power amplifier is widely used due to its high efficiency, resulting from switching at zero voltage and zero slope of the switch voltage (i.e. ZVS and DZVS). This paper presents an analytical expression of the gain between the DC input voltage and the peak switch voltage on an ideal class-E power amplifier (PA) with finite dc-feed inductance, ZVS and DZVS operation. This expression is verified by simulations, and it is evaluated by experimental results at a switching frequency of 10.24MHz. Considering the results (simulated and experimental), the maximum error was 10,2%.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132344991","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}
引用次数: 8
Image filtering in a CMOS analog CNN CMOS模拟CNN的图像滤波
Latin American Symposium on Circuits and Systems Pub Date : 2015-09-10 DOI: 10.1109/LASCAS.2015.7250426
F. Andrade, Ygor Oliveira da Guarda Souza, E. Santana, A. Cunha
{"title":"Image filtering in a CMOS analog CNN","authors":"F. Andrade, Ygor Oliveira da Guarda Souza, E. Santana, A. Cunha","doi":"10.1109/LASCAS.2015.7250426","DOIUrl":"https://doi.org/10.1109/LASCAS.2015.7250426","url":null,"abstract":"A compact low-power CMOS analog circuit implementation of a Cellular Neural Network which uses continuously programmable weight values has been presented recently. Now the operation of this full signal range CNN in image filtering is verified through simulation. A learning tool comprising a friendly graphical interface and the center of mass learning algorithm has been developed, which made it possible to determine optimal coefficients for CNN application in image filtering. Circuit simulations of low-pass and high-pass filters have been accomplished with satisfactory results.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128700683","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}
引用次数: 3
Alchemy: An MSP430-based reconfigurable processor architecture Alchemy:基于msp430的可重构处理器架构
Latin American Symposium on Circuits and Systems Pub Date : 2015-02-01 DOI: 10.1109/LASCAS.2015.7250440
C. S. Oliveira, D. C. D. S. Júnior
{"title":"Alchemy: An MSP430-based reconfigurable processor architecture","authors":"C. S. Oliveira, D. C. D. S. Júnior","doi":"10.1109/LASCAS.2015.7250440","DOIUrl":"https://doi.org/10.1109/LASCAS.2015.7250440","url":null,"abstract":"Reconfigurable architectures can surely provide significant advantages for low-end embedded processors. The ability to implement new application-specific instructions for general-purpose processor makes embedded systems implementation more flexible and less expensive for designers and companies. Alchemy is a new low-end open-source embedded and reconfigurable architecture that couples a general purpose CPU with an FPGA. This paper introduces Alchemy architecture and presents practical tests of architecture capabilites.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130311061","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}
引用次数: 0
On simple comb decimation structure based on Chebyshev sharpening 基于切比雪夫锐化的简单梳状抽取结构
Latin American Symposium on Circuits and Systems Pub Date : 2015-02-01 DOI: 10.1109/LASCAS.2015.7250485
M. Jiménez, D. Romero, G. Jovanovic-Dolecek
{"title":"On simple comb decimation structure based on Chebyshev sharpening","authors":"M. Jiménez, D. Romero, G. Jovanovic-Dolecek","doi":"10.1109/LASCAS.2015.7250485","DOIUrl":"https://doi.org/10.1109/LASCAS.2015.7250485","url":null,"abstract":"This paper introduces a new efficient Cascaded Integrator-Comb (CIC)-based decimation structure. The proposed filter uses a low-complexity passband droop compensator and the Chebyshev sharpening technique, both recently introduced in literature, to improve the magnitude response. In this way this method improves the worst-case aliasing rejection and simultaneously decreases the passband deviation of traditional comb decimation filters. It is shown that the proposed filter exhibits better characteristics than the traditional CIC filter and other recent methods from literature.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126470363","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}
引用次数: 1
Modified comb decimator for high power-of-two decimation factors 改进的梳状抽取器，用于高2次幂的抽取因子
Latin American Symposium on Circuits and Systems Pub Date : 2014-05-26 DOI: 10.1109/LASCAS.2014.6820255
G. Salgado, G. Jovanovic-Dolecek, J. M. Rosa
{"title":"Modified comb decimator for high power-of-two decimation factors","authors":"G. Salgado, G. Jovanovic-Dolecek, J. M. Rosa","doi":"10.1109/LASCAS.2014.6820255","DOIUrl":"https://doi.org/10.1109/LASCAS.2014.6820255","url":null,"abstract":"This paper presents a modified two-stage comb decimation structure for Sigma-Delta Analog-to-Digital Converters (ADC) with high decimation factor, which can be implemented as a power of two. The proposed structure exhibits a decreased passband droop, as well as increased attenuations in the folding bands compared with the power and area efficient structures recently proposed in the literature. This is achieved by introducing a simple corrector filter at second CIC (Cascaded-Integrator-Comb) stage, such that it works at the rate, which is less than the high input rate by half of the decimation factor. The corrector filters depend only on the number of the cascaded equivalent combs. In that way the same corrector can be used for the comb decimator with different decimation factors but with the equal number of the cascaded combs. The comparison with the power and area efficient comb-based structures from literature, and the VHDL implementation, confirm the efficiency of the proposed structure.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129550802","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}
引用次数: 0
On generating a finite pulse or a symmetric impulse response by a generalized approximation function 用广义近似函数生成有限脉冲或对称脉冲响应
Latin American Symposium on Circuits and Systems Pub Date : 2014-05-26 DOI: 10.1109/LASCAS.2014.6820304
Douglas David Baptista de Souza, S. N. Filho
{"title":"On generating a finite pulse or a symmetric impulse response by a generalized approximation function","authors":"Douglas David Baptista de Souza, S. N. Filho","doi":"10.1109/LASCAS.2014.6820304","DOIUrl":"https://doi.org/10.1109/LASCAS.2014.6820304","url":null,"abstract":"In some recent applications, researchers have been facing old problems of the time-domain synthesis, like the necessity of having circuits providing particular temporal responses. In this paper, we show that a recent method suitable to approximate functions with symmetric impulse response, and other one to obtain pulses with finite duration, actually refers to the same function. Hence, it allows us to derive a generalized transfer function, which contemplates both applications. A table with explicit expressions for the transfer functions is also given.","PeriodicalId":429000,"journal":{"name":"Latin American Symposium on Circuits and Systems","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126508017","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}
引用次数: 1
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