39th Annual Symposium on Frequency Control最新文献_第9页

Measurement and Interpretation of Hydrogen Maser Quality Parameters 氢脉泽质量参数的测量与解释

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200820

E. Mattison, W. Shen, R. Vessot

引用次数: 3

Low Profile Glass Packaged Crystal Unit 低轮廓玻璃封装晶体单元

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200867

M. Sato, H. Eguchi, S. Ishigami, K. Yamamoto

引用次数: 1

The Analytic Signal Representation of Oscillators with Application to Frequency Stability Analysis 振荡器的解析信号表示及其在频率稳定分析中的应用

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200830

L. Bernier, F. Gardiol

引用次数: 4

VHF Monolithic Crystal Filters Fabricated by Chemical Milling 化学研磨制备甚高频单晶滤波器

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200888

R. Smythe, M. D. Howard, J. R. Hunt

{"title":"VHF Monolithic Crystal Filters Fabricated by Chemical Milling","authors":"R. Smythe, M. D. Howard, J. R. Hunt","doi":"10.1109/FREQ.1985.200888","DOIUrl":"https://doi.org/10.1109/FREQ.1985.200888","url":null,"abstract":"The fundamental frequency limitations imposed by conventional quartz wafer machining can be overcome by chemical milling. Using this process, two-pole, fundamental mode AT-cut monolithic filters have been fabricated at frequencies from 70 to 250 MHz. Four and six-pole tandem monolithic filters have also been constructed. Chemical milling allows the realization in an inductorless tructure of filter bandwidths previously unattainable at VHF. Capabilities and limitations are discussed. Introduction The introduction of dual-mode resonators in the '60's greatly advanced the VHF crystal filter art by simplifications resulting from the reduced number of components as compared with discreteresonator filters. Most importantly, it afforded improvements by eliminating the need for balanced transformers, which increase in difficulty with increasing frequency. Further restrictions remain, however, associated with the maximum fundamental frequency obtainable using conventional wafer lapping and polishing techniques. Since, at a given frequency and bandwidth, filter impedance is proportional to the third power of the overtone, increasing the realizable fundamental frequency greatly extends the capabilities of crystal filters. Vig, et a1 [ l , 21 developed the use of chemical etching for polishing quartz, and suggested that etching might be used to fabricate resonators having the ring-supported wafer structure proposed by Guttwein, Ballato, and Lukaszek [3] and others. The development of such chemically etched, or milled, VHF and UHF ring-supported resonators has been carried out in our organization [ 4 ] . The same process techniques have also been applied to the fabrication of monolithic two-pole filters at fundamental frequencies up to 250 MHz. Four and six-pole tandem monolithic filters have also been produced. This paper describes some of the filters which have been developed and discusses the capabilities and limitations of this approach. Two-Pole Fabrication Figure 1 shows the ringsupported wafer structure of a chemically milled two-pole monolithic filter. Aluminum electrodes were deposited using photofabricated aperture masks and electron-beam-gun evaporation. The electrode configuration shown is similar to that used by us for conventional VHF two-poles. An alternative arrangement, discussed below, was also employed. The two-pole devices were packaged in standard 3-lead holders dimensionally equivalent to type HC-l8/U except for a reduced height of 0.450 inch (11.4 mm). FIG. 1. RING-SUPPORTED MONOLITHIC FILTER WAFER As frequency and bandwidth increase, required electrode dimensions decrease. The use of conventional aperture masks to define electrode patterns is limited by aperture dimensional tolerances and by front-to--back mask registration errors. To alleviate the former to some degree and to essentially eliminate the effect of mis-registration, the novel electrode configuration shown in figure 2 was devised and used to fabricate the 252 MHz two-pole ","PeriodicalId":291824,"journal":{"name":"39th Annual Symposium on Frequency Control","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125879720","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: 5

The State-of-the-Art Medium Terminal (SAMT) Time and Frequency Distribution System 最先进的中终端(SAMT)时间和频率分配系统

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200837

A. Vulcan, M. Bloch

{"title":"The State-of-the-Art Medium Terminal (SAMT) Time and Frequency Distribution System","authors":"A. Vulcan, M. Bloch","doi":"10.1109/FREQ.1985.200837","DOIUrl":"https://doi.org/10.1109/FREQ.1985.200837","url":null,"abstract":"The SAMT Satellite Ground Station Distribution System uses redundant Cesium Frequency Standards in conjunction with automatic signal monitoring and switchover equipment to provide 5 MHz, 1 MHz, 1 PPS, and TOD to converter assemblies and other users at the ground station site. The unique features of the SAMT Distribution System are extremely low vibrational and operationally induced phase and amplitude perturbations and output isolation exceeding 100 dB. Automatic switchover is accomplished by a method which ensures that the phase change at the system timing outputs is less than 0.001 degrees when switching from the on-line to standby atomic standard. Glitch-free performance is obtained by utilizing a dynamic phase matching system which incorporates A to D and D to A converters, and a micrologic memory which automatically slews the output phase of the standby Atomic Standard to agree with that of the on-line unit prior to switchover. A disciplined oscillator provides the 5 MHz, 1 MHz and 1 PPS system outputs with extremely low phase jitter and a noise floor of -170 dBc/Hz. Various sine wave and pulse output signals are fed to the system users by high isolation amplifier modules. Cascode circuitry and careful layout ensures that the isolation between the outputs exceeds 105 dB. This isolation permits changing terminations or removing output cables with less than 1 millidegree","PeriodicalId":291824,"journal":{"name":"39th Annual Symposium on Frequency Control","volume":"31 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1985-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116783241","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

An Analysis of Doubly-Rotated Contoured Quartz Crystal Resonators 双旋转异形石英晶体谐振器的分析

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200882

D. Stevens, H. Tiersten

引用次数: 28

Frequency-Temperature Behavior of Flexural and Thickness-Shear Vibrations of Rectangular Rotated Y-Cut Quartz Plates 矩形旋转y形切割石英板弯曲振动和厚度剪切振动的频率-温度特性

39th Annual Symposium on Frequency Control Pub Date : 1985-05-29 DOI: 10.1109/FREQ.1985.200879

Y. Yong, Pcy Lee

引用次数: 6

Specifications and Standards Germaine to Frequency Control 频率控制规范和标准

39th Annual Symposium on Frequency Control Pub Date : 1900-01-01 DOI: 10.1109/FREQ.1985.200901

引用次数: 0

Generalized Equation for the Force-Frequency Characteristics of Circular Quartz Plates with Three-Point Support and Its Application to Supporting of an SC-Cut Plate 三点支承圆形石英板力频特性的广义方程及其在sc -切割板支承中的应用

39th Annual Symposium on Frequency Control Pub Date : 1900-01-01 DOI: 10.1109/FREQ.1985.200883

N. Oura, N. Kuramochi, Y. Miyazaki, M. Yamashina, S. Suzuki

引用次数: 0

Fluorescent Light Shift in Optically Pumped Cesium Standards 光抽运铯标准中的荧光位移

39th Annual Symposium on Frequency Control Pub Date : 1900-01-01 DOI: 10.1109/FREQ.1985.200813

J. Shirley

引用次数: 22