Research Work for Frequency Temperature Compensation Techniques for Quartz Crystal Oscillators in Conjunction with Signal Corps Technical Requirements Scl-6610b Dated 9 September 1963 PDF Download

Author: BENDIX CORP DAVENPORT IA PIONEER-CENTRAL DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 36

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A computer program is presented that was successfully used to determine thermistor-resistor compensation networks. Examples are given and results of synthesizing a number of compensation networks are given. The computer program will solve for the thermistor-resistor values in the compensation network, the R1/R2 ratio of the network at all temperatures of interest; the error in R1/R2 of the synthesized network compared to the required R1/R2 ratio; and the resultant expected frequency error at each temperature. (Author).

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ISBN:
Category : Science
Languages : en
Pages : 440

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Languages : en
Pages : 0

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The purpose of this project is to evolve a practical approach to the temperature compensation of quartz crystal oscillators. The study will be concentrated on a nominal frequency of five megacycles, but will be generally applicable to AT cut quartz crystals of from 1 to 20 megacycles. The use of graphical analysis for TCXO design is discussed. The results of this investigation show that a graphical analysis will not be useable for very accurate compensation because of resolution and parameters that cannot be taken into account with graphs. The techniques for determining compensation networks are discussed. A new technique is described where diodes are used in conjunction with thermistor-resistor networks. The 5 x 10 to the minus 8th power, Group III, TCXO's are discussed. Results of the first compensation attempts are given. The compensation networks and techniques used are presented. (Author).

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Category :
Languages : en
Pages : 61

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This work involves development of circuit techniques for the frequency temperature compensation of three quartz crystal oscillator groups. Development of a linearized network approach has led to the generation of three separate computer programs. The three programs offer varying degrees of compensation, based on increasing circuit complexity. Successful application of these programs has been made in compensating the Group II oscillators. In conjunction with the programming effort, a preliminary investigation has been made to determine the effects of component tolerances on compensation. The Group II oscillator design was refined, and the improved features were incorporated in the final assembly of the oscillators. Circuit function and performance details are included in this report. First order compensation of these three oscillators indicates that the desired stability characteristics will be achieved. The oscillator aging experiment was initiated using eight oscillators housed in a stabilized-temperature enclosure. Compensation of these oscillators will be made as soon as initial aging trends are determined. Frequency adjustment studies were continued and resulted in a trimming method utilized which provides minimal effect on the degree of compensation.

Author: Marvin Frerking
Publisher: Springer Science & Business Media
ISBN: 9401160562
Category : Science
Languages : en
Pages : 252

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Crystal oscillators have been in use now for well over SO years-one of the first was built by W. G. Cady in 1921. Today, millions of them are made every year, covering a range of frequencies from a few Kilohertz to several hundred Mega hertz and a range of stabilities from a fraction of one percent to a few parts in ten to the thirteenth, with most of them, by far, still in the range of several tens of parts per million.Their major application has long been the stabilization of fre quencies in transmitters and receivers, and indeed, the utilization of the frequency spectrum would be in utter chaos, and the communication systems as we know them today unthinkable,'without crystal oscillators. With the need to accommodate ever increasing numbers of users in a limited spectrum space, this traditional application will continue to grow for the fore seeable future, and ever tighter tolerances will have to be met by an ever larger percentage of these devices.

Author: Darrell E. Newell
Publisher:
ISBN:
Category :
Languages : en
Pages : 78

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The first section of the report discusses a new hybrid voltage regulator which is housed in a TO5 container. The regulator was specifically designed for utilization by TCXOs and consequently, contains desirable feature for this use. The second phase of the investigation covers the generation of various temperature environments. A ramp generator and interval generator have been developed. Temperature ramps have been generated at slopes varying from 6.165 to 0.057 C/min. The third section of the report covers a study of isolation amplifiers. Since TCXO size is of importance, it is desirable to use as few stages as possible. Consequently, if an isolation amplifier can be used to provide both isolation and some degree of gain satisfactorily, it may be possible to omit one gain stage. (Author).

Author: T. Kudo
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

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This paper describes a new frequency temperature compensation method for crystal oscillators. The method is applicable to resonators with second order or third order frequency temperature characteristics. Hence, an oscillator with an AT cut, a BT cut crystal unit or a surface acoustic wave resonator (SAWR) can be efficiently compensated. A conventional temperature compensated crystal oscillator (TCXO) uses an expensive variable capacitance diode (varactor) with good linearity as well as many thermistors. Considerable efforts have been devoted to developing a new reactance circuit to replace the varactor. It was found that a series circuit, involving a capacitor and a silicon diode, has the same characteristics as a varactor, and its linearity could be easily adjusted. In the case of an AT cut crystal unit with third order frequency temperature characteristics, compensation over a wide temperature range can be achieved by using two series circuits.

Author: Mark Berry
Publisher:
ISBN: 9781423532026
Category :
Languages : en
Pages : 94

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The U.S. Army Research Laboratory (ARL), specifically the RF electronics Division of the Sensors and Electron Devices Directorate, has been tasked to become the Department of Defense (DoD) center for frequency control. As part of this program, ARL and others will develop frequency oscillators to be used as system clocks in munitions and other devices. ARL has assembled a test facility to measure the effects of vibration on frequency oscillators. This report discusses the results of vibration experiments on two quartz crystal oscillators, including verification of the measurement system and experimental setup.

Author: Anju Gattani
Publisher:
ISBN: 9781953100092
Category :
Languages : en
Pages : 344

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To uphold family honor and tradition, Sheetal Prasad is forced to forsake the man she loves and marry playboy millionaire Rakesh Dhanraj while the citizens of Raigun, India, watch in envy. On her wedding night, however, Sheetal quickly learns that the stranger she married is as cold as the marble floors of the Dhanraj mansion. Forced to smile at family members and cameras and pretend there's nothing wrong with her marriage, Sheetal begins to discover that the family she married into harbors secrets, lies and deceptions powerful enough to tear apart her world. With no one to rely on and no escape, Sheetal must ally with her husband in an attempt to protect her infant son from the tyranny of his family.sion.

Author: Phil Foglio
Publisher: Simon and Schuster
ISBN: 1949102289
Category : Fiction
Languages : en
Pages : 484

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In a time when the Industrial Revolution has become an all-out war, mad science rules the world—with mixed success. In Agatha H and the Siege of Mechanicsburg, Agatha Heterodyne, the last of the Heterodyne family, has returned to her family’s hereditary town with the might of the Wulfenbach Empire hot on her heels. The only thing holding off an outright attack is Gilgamesh Wulfenbach, the heir to the Empire, who has joined Agatha and her friends inside the great artificially intelligent fortress of Castle Heterodyne. Now they must race to repair the mechanisms that once allowed the Castle to defend Mechanicsburg, before the rest of Europa shows up to take all the revenge the mad Heterodynes of the past so richly earned. From the Hugo Award–winning Girl Genius online comics comes this fourth book in the Agatha H. series, and like the previous three books, it will engage you in a unique world of adventure, romance, and mad science!