{"title":"Special purpose oscillators","authors":"J. Foit, M. Husák","doi":"10.1109/ASDAM.2014.6998673","DOIUrl":null,"url":null,"abstract":"In many sensor applications, the frequency variations of signals generated as sustained oscillations are used as a measure of the tracked non-electrical quantity. The variations of oscillation frequency are usually obtained by some mechanism influencing the imaginary parts of impedances constituting a resonant circuit, electrical or some electro-mechanical equivalent. Unfortunately, in all these cases, real parts of the resonant circuit are varied as well, frequently to a quite considerable degree, meaning that in real operation the dynamic impedance of the resonator varies notably. As a result, it is rather difficult to keep the oscillations-generating circuit (i.e., oscillator) operating in optimum mode. In this connection, the optimum operating mode is defined as the state in which the condition for sustained self-oscillation is just fulfilled, without overdriving any of the active and passive devices involved. This paper discusses methods for solving this problem.","PeriodicalId":313866,"journal":{"name":"The Tenth International Conference on Advanced Semiconductor Devices and Microsystems","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Tenth International Conference on Advanced Semiconductor Devices and Microsystems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ASDAM.2014.6998673","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
In many sensor applications, the frequency variations of signals generated as sustained oscillations are used as a measure of the tracked non-electrical quantity. The variations of oscillation frequency are usually obtained by some mechanism influencing the imaginary parts of impedances constituting a resonant circuit, electrical or some electro-mechanical equivalent. Unfortunately, in all these cases, real parts of the resonant circuit are varied as well, frequently to a quite considerable degree, meaning that in real operation the dynamic impedance of the resonator varies notably. As a result, it is rather difficult to keep the oscillations-generating circuit (i.e., oscillator) operating in optimum mode. In this connection, the optimum operating mode is defined as the state in which the condition for sustained self-oscillation is just fulfilled, without overdriving any of the active and passive devices involved. This paper discusses methods for solving this problem.