About: Parasitic oscillation

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Parasitic oscillation is an undesirable electronic oscillation (cyclic variation in output voltage or current) in an electronic or digital device. It is often caused by feedback in an amplifying device. The problem occurs notably in RF, audio, and other electronic amplifiers as well as in digital signal processing. It is one of the fundamental issues addressed by control theory.

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rdfs:label	Parasitic oscillation (en) 雜散振盪 (zh)
rdfs:comment	雜散振盪（Parasitic oscillation）是在電子設備或是數位設備中不希望出現的振盪（輸出電壓或是電流的周期變化）。一般是因為放大設備加上回授所造成，常見於、及其他放大器電路以及数字信号处理。雜散振盪是控制理論中的幾個基礎議題之一。雜散振盪因為會有以下的問題，一般不希望出現。振盪可能會耦合到其他電路，或是會發射无线电波、造成對其他設備的電磁干擾（EMI）。在音響系統中，雜散振盪會造成耳機或是喇叭出現惱人的噪音。雜散振盪也會消耗能量，造成不必要的發熱。例如有雜散振盪的音響功率放大器會產生更大的能量給喇叭，可能會造起損害。振盪的電路可能不再工作在其線性區，因此其中的信號會出現畸變。在數位電路中，雜散振盪只會出現在特定的邏輯轉態中，會造成後續模組的錯誤動作，例如計數器會看到錯誤的脈波，計數值也會錯誤。 (zh) Parasitic oscillation is an undesirable electronic oscillation (cyclic variation in output voltage or current) in an electronic or digital device. It is often caused by feedback in an amplifying device. The problem occurs notably in RF, audio, and other electronic amplifiers as well as in digital signal processing. It is one of the fundamental issues addressed by control theory. (en)
dcterms:subject	Amplifiers Electronic oscillators Control theory Electronic feedback Dynamical systems Ordinary differential equations
Wikipage page ID	27960249 (xsd:integer)
Wikipage revision ID	1052794232 (xsd:integer)
Link from a Wikipage to another Wikipage	Amplifiers Electromagnetic interference Electronic oscillation Motorboating (electronics) Bode plot Decoupling capacitor Nyquist plot Control theory Phase shift Loudspeaker Tuned radio frequency receiver Electronic oscillators Gain (electronics) Radio wave Control theory Alternating current Feedback Barkhausen stability criterion Positive feedback Electronic feedback Audio feedback Dynamical systems Ordinary differential equations June 2009 Washington Metro train collision Transfer function Transistor radio Digital signal processing Ground (electricity) Inductance Capacitance Radian Printed circuit board Loop gain Servomechanism Neutrodyne RF power amplifier Electronic amplifier Audio amplifier
sameAs	Parasitic oscillation Parasitic oscillation Parasitic oscillation Parasitic oscillation Parasitic oscillation Parasitic oscillation
dbp:wikiPageUsesTemplate	dbt:Reflist
has abstract	Parasitic oscillation is an undesirable electronic oscillation (cyclic variation in output voltage or current) in an electronic or digital device. It is often caused by feedback in an amplifying device. The problem occurs notably in RF, audio, and other electronic amplifiers as well as in digital signal processing. It is one of the fundamental issues addressed by control theory. Parasitic oscillation is undesirable for several reasons. The oscillations may be coupled into other circuits or radiate as radio waves, causing electromagnetic interference (EMI) to other devices. In audio systems, parasitic oscillations can sometimes be heard as annoying sounds in the speakers or earphones. The oscillations waste power and may cause undesirable heating. For example, an audio power amplifier that goes into parasitic oscillation may generate enough power to damage connected speakers. A circuit that is oscillating will not amplify linearly, so desired signals passing through the stage will be distorted. In digital circuits, parasitic oscillations may only occur on particular logic transitions and may result in erratic operation of subsequent stages; for example, a counter stage may see many spurious pulses and count erratically. (en) 雜散振盪（Parasitic oscillation）是在電子設備或是數位設備中不希望出現的振盪（輸出電壓或是電流的周期變化）。一般是因為放大設備加上回授所造成，常見於、及其他放大器電路以及数字信号处理。雜散振盪是控制理論中的幾個基礎議題之一。雜散振盪因為會有以下的問題，一般不希望出現。振盪可能會耦合到其他電路，或是會發射无线电波、造成對其他設備的電磁干擾（EMI）。在音響系統中，雜散振盪會造成耳機或是喇叭出現惱人的噪音。雜散振盪也會消耗能量，造成不必要的發熱。例如有雜散振盪的音響功率放大器會產生更大的能量給喇叭，可能會造起損害。振盪的電路可能不再工作在其線性區，因此其中的信號會出現畸變。在數位電路中，雜散振盪只會出現在特定的邏輯轉態中，會造成後續模組的錯誤動作，例如計數器會看到錯誤的脈波，計數值也會錯誤。 (zh)
gold:hypernym	Oscillation
prov:wasDerivedFrom	wikipedia-en:Parasitic_oscillation?oldid=1052794232&ns=0
page length (characters) of wiki page	7189 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Parasitic_oscillation
is Link from a Wikipage to another Wikipage of	Amplifier Electronic oscillation Electronic oscillator Motorboating (electronics) Dye laser Dynatron oscillator Pentode Self-oscillation Neutralization Track circuit Plate electrode Washington Metro signaling and operation 4000-series integrated circuits Fiber-optic communication Positive feedback Suppressor grid Radio receiver Resonator June 2009 Washington Metro train collision Reflex receiver Ferrite bead Capacitance Secondary emission

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