Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)最新文献_第6页

A sine wave digital synthesizer based on a quadratic approximation 基于二次逼近的正弦波数字合成器

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956385

L. Fanucci, R. Roncella, R. Saletti

{"title":"A sine wave digital synthesizer based on a quadratic approximation","authors":"L. Fanucci, R. Roncella, R. Saletti","doi":"10.1109/FREQ.2001.956385","DOIUrl":"https://doi.org/10.1109/FREQ.2001.956385","url":null,"abstract":"A sine evaluation architecture based on a quadratic interpolation is considered for the realization of direct digital frequency synthesizers (DDFS). In the proposed architecture the sine values are approximated with the output of a second order interpolator, whose coefficients are stored in a tiny look-up table (LUT). The memory and computation resources needed by this approach are compared with a solution where a first order interpolation is used, recently presented as the best LUT-based system for DDFS implementation. The comparison demonstrates that parabolic interpolation of the sine function asymptotically outperforms lower order approximations and that it could be considered as a better approach for frequency synthesizers with output resolution of practical interest. As a case example, a DDFS with a phase resolution of 20 b and an output resolution of 9 b has been designed. It is characterized by a maximum absolute error of 0.798 LSB, an output signal to noise ratio (SNR) of 55.60 dB and a spectral purity better than 74 dBc. The dimension of the LUT is only 104 b, and the parabolic interpolator has an estimated complexity equivalent to 175 full-adders. The structure of the evaluator is simple, easily pipelinable, and well suited to an integrated implementation.","PeriodicalId":369101,"journal":{"name":"Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127379211","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: 17

Optimisation of weighted SAW grating reflectors with minimised time delay deviation 具有最小时延偏差的加权SAW光栅反射器优化

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956360

T. Omori, J. Akasaka, M. Arai, Kunihiko Hashimoto, M. Yamaguchi

引用次数: 8

Frequency stability and phase noise characteristics of digital OCXOs using dual-mode excitation 采用双模激励的数字ocxo频率稳定性和相位噪声特性

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956382

Y. Watanabe, K. Ozaki, S. Goka, T. Sato, H. Sekimoto

{"title":"Frequency stability and phase noise characteristics of digital OCXOs using dual-mode excitation","authors":"Y. Watanabe, K. Ozaki, S. Goka, T. Sato, H. Sekimoto","doi":"10.1109/FREQ.2001.956382","DOIUrl":"https://doi.org/10.1109/FREQ.2001.956382","url":null,"abstract":"A high-stability oven-controlled crystal oscillator (OCXO) (frequency stability; +/- 10 ppb from -30 to 70/spl deg/C) has been developed using a dual-mode SC-cut quartz crystal oscillator. The oscillator's frequency stability includes a frequency-temperature hysteresis over the range of operational temperatures, and repeatability of frequencies after power is switched off then back on. In this OCXO a conventional oven-control system is used for coarse compensation and a digital correction system is used for fine compensation. The combination of these forms of compensation greatly improves the C-mode frequency stability and expands the operational temperature range with a very small additional requirement for electric power. Experimental results indicate that the frequency-temperature stability of the OCXO was 20 times better, and its operational temperature range 30 degrees wider, than the conventional OCXOs. We also measured the phase noise characteristics of this OCXO. The experimental results indicate that very low phase-noise (-157 dBc/Hz @ 10 kHz) can be obtained at the floor region. This noise level corresponds well with a calculation based on our dual-mode oscillator noise estimation.","PeriodicalId":369101,"journal":{"name":"Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121934887","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: 2

Single-sided grooved type or double-sided grooved type resonators manufactured by chemical etching process of two or above steps 单面沟槽式或双面沟槽式谐振器，由两步或以上的化学蚀刻工艺制造

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956253

Y. Nagaura, Z. Nagaura, K. Nagaura, K. Nagato, K. Emoto, K. Imani, K. Kinoshita, S. Yokomizo, M. Nakazawa

引用次数: 4

A critical evaluation of the determination of high-order elastic stiffnesses of quartz 石英高阶弹性刚度测定的关键评价

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956210

J. Nosek

引用次数: 5

Contribution to the electromechanical and nonlinear properties of GaPO/sub 4/ crystals 对GaPO/sub - 4晶体机电和非线性特性的贡献

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956204

J. Nosek, J. Zelenka

{"title":"Contribution to the electromechanical and nonlinear properties of GaPO/sub 4/ crystals","authors":"J. Nosek, J. Zelenka","doi":"10.1109/FREQ.2001.956204","DOIUrl":"https://doi.org/10.1109/FREQ.2001.956204","url":null,"abstract":"In the last decade much attention is given to piezoelectric crystals with a large value of the electromechanical coupling coefficient. Namely, quartz homeotype crystals such as berlinite, langasite and also gallium ortophosphate (GaPO/sub 4/) are the representatives of this group of crystals. Approximately two times greater coupling coefficient k/sub 26/ connected with the resonators vibrating in the thickness-shear mode allows extend the distance between the series and parallel resonance frequency of the resonators suitable for the frequency range from 1 to 100 MHz. This is important for some types of crystal oscillator and monolithic filter. The large electromechanical coupling coefficient increases also the difference of the resonant frequency temperature dependence of the fundamental and harmonic resonance frequencies of the resonators vibrating in the thickness-shear mode. The results of the measured resonance frequency temperature characteristics of fundamental and third harmonic of Y-cuts of GaPO/sub 4/ resonators vibrating in thickness-shear mode are presented. The computed electromechanical coupling coefficient k/sub 26/ are compared with the measured ones. Attention is further given to the measurement of some nonlinear properties of the rotated Y-cuts GaPO/sub 4/ resonators vibrating in essentially thickness-shear mode. The knowledge of the nonlinear interactions is important for the analysis of intermodulation phenomena resonators. This phenomena is important for the application of GaPO/sub 4/ resonators in crystal oscillators, filters and other electronic devices.","PeriodicalId":369101,"journal":{"name":"Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129688039","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: 4

A millimeter wave monolithic VCO with an integrated HEMT as a varactor 毫米波单片压控振荡器，集成HEMT作为变容管

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956388

R. Kozhuharov, H. Zirath

引用次数: 7

Reduction of 1/f PM noise in BJT amplifiers with emitter feedback using compensation effects 利用补偿效应降低发射极反馈的BJT放大器中1/f PM噪声

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956184

T. I. Boldyreva

引用次数: 2

State of the art in ultra stable oscillators for accurate/precise on board and ground applications 最先进的超稳定振荡器，用于精确/精确的机载和地面应用

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956377

V. Candelier, P. Canzian, J. Lamboley, G. Marotel, P. Poulain

引用次数: 3

PZT thin film bulk acoustic wave resonators and filters PZT薄膜体声波谐振器和滤波器

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI: 10.1109/FREQ.2001.956364

Paul B. Kirby, Q. Su, E. Komuro, Qi Zhang, Masaaki Imura, R. Whatmore

引用次数: 21