The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Ceramic Sealing Window (CSW) and Frequency Tuning Rod (FTR) are two important components of the Ramsey cavity. Here, a complete electromagnetic model of the Ramsey cavity is built with Finite-element tool HFSS, and the effects of CSW and FTR on the cavity response are simulated and analyzed in detail. To achieve high coupling efficiency, the estimated parameter ranges of CSW and FTR are investigated...
In this paper, a novel mass-sensitivity-based method for field measurement of liquid viscosities using a quartz crystal microbalance (QCM) is presented. And a model which yields a quantitative description of the influence of the liquid properties on the oscillation frequency is established as well. The viscosity of liquids (which loaded on a QCM's center) could be quickly and conveniently obtained...
A novel scheme of voltage controlled temperature compensated crystal oscillator (VCTCXO) which could realize frequency adjustment and temperature compensation simultaneously is presented. The scheme is based on the binary function V = F(T, ft) which could be obtained from the temperature experiments, where ft is the target output frequency (controlled and adjusted by external control voltage); T is...
Quartz crystal microbalance (QCM) is a type of very high sensitivity mass sensing device, its sensitivity can be characterized by either frequency shift or phase shift. The main effect inducing this characteristic is the mass effect. That is to say, when the sensing surface of the device is perturbed by adding a thin film of or a mass layer, the resonant frequency will change, and so do the corresponding...
An exact formula for the equivalent circuit of a crystal resonator in series with a capacitor is derived. Network analysis is used to obtain an exact formula for the equivalent circuit parameters without applying any approximations. The result is an expansion of that obtained by those who used assumptions regarding high frequency, high quality factor, high capacitance ratio, and so on. Hence, this...
This paper presented an improved design on a 121.4 MHz overtone TCXO which exhibited a low phase noise. The temperature compensation approach differs from conventional ones such as adding series inductances or frequency multiplication. It makes of a 100 MHz 5th overtone crystal oscillator mixed with the frequency of a 21.4 MHz fundamental mode voltage controlled crystal oscillator (VCXO). And then,...
This paper presented a new 121.4 MHz overtone TCXO with low phase noise. The compensation approach differs from conventional ones such as adding series inductances or frequency multiplication. It can provide a very high stability and a low phase noise level for an overtone oscillator. It makes the frequency of a 100 MHz 5 th overtone crystal oscillator mixed with that of a 21.4 MHz fundamental mode...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.