In electrical networks, a parasitic element is a circuit element (resistance, inductance or capacitance) that is possessed by an electrical component but which it is not desirable for it to have for its intended purpose. For instance, a resistor is designed to possess resistance, but will also possess unwanted parasitic capacitance.
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| - Parasite (électricité) (fr)
- Parasitic element (electrical networks) (en)
- 寄生元件 (zh)
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| - En électricité et en électronique, est parasite un signal électrique qui ne fait pas partie du courant électrique tel que celui-ci a été produit. En radioélectricité, on parle aussi d'interférence. Les parasites sont très souvent le produit d'autres courants électriques qui créent des ondes électromagnétiques qui se propagent dans les matériaux isolants. Pour se prémunir des parasites, on utilise couramment des cages de Faraday ou blindages métalliques.
* Portail de l’électricité et de l’électronique (fr)
- 寄生元件（英語：parasitic element）是电路中电子元件（如電阻、電容及電感）产生的附加元件，而且多半不是设计时想要的。例如，电阻器被设计用来产生阻抗，然而它实际也会产生不需要的寄生电容。 電路中不可避免的會有寄生元件，所有導體都包括電阻及電感，而根據，這樣的導體中一定有電容。元件設計者也無法完全去除寄生元件，只能設法減少寄生元件的影響。 最常見的寄生元件是零件接腳的寄生電阻及電感，以及零件接腳封裝上的寄生電容。對於像變壓器及電感器等繞線元件，最明顯的寄生效應是繞線各匝之間的寄生電容，繞線的寄生電容會使得元件在某特定頻率發生共振，因此元件在該頻率（及更高的頻率）無法發揮電感器的作用。 寄生元件一般都會用集總電路來表示，不過這不一定都適用，例如上述繞線元件中的寄生電容不是在一個特定的位置，比較適合用。有時元件設計者可以利用寄生元件的效應來達到元件特殊的功能，例如。 寄生元件也有非線性的，一般非線性的寄生元件是指在積體電路中的，原因是二個或多個電子元件之間有PN结，因此產生了非设计时想要的電子特性。 (zh)
- In electrical networks, a parasitic element is a circuit element (resistance, inductance or capacitance) that is possessed by an electrical component but which it is not desirable for it to have for its intended purpose. For instance, a resistor is designed to possess resistance, but will also possess unwanted parasitic capacitance. (en)
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| - En électricité et en électronique, est parasite un signal électrique qui ne fait pas partie du courant électrique tel que celui-ci a été produit. En radioélectricité, on parle aussi d'interférence. Les parasites sont très souvent le produit d'autres courants électriques qui créent des ondes électromagnétiques qui se propagent dans les matériaux isolants. Pour se prémunir des parasites, on utilise couramment des cages de Faraday ou blindages métalliques.
* Portail de l’électricité et de l’électronique (fr)
- In electrical networks, a parasitic element is a circuit element (resistance, inductance or capacitance) that is possessed by an electrical component but which it is not desirable for it to have for its intended purpose. For instance, a resistor is designed to possess resistance, but will also possess unwanted parasitic capacitance. Parasitic elements are unavoidable. All conductors possess resistance and inductance and the principles of duality ensure that where there is inductance, there will also be capacitance. Component designers will strive to minimise parasitic elements but are unable to eliminate them. Discrete components will often have some parasitic values detailed on their datasheets to aid circuit designers in compensating for unwanted effects. The most commonly seen manifestations of parasitic elements in components are in the parasitic inductance and resistance of the component leads and the parasitic capacitance of the component packaging. For wound components such as inductors and transformers, there is additionally the important effect of parasitic capacitance that exists between the individual turns of the windings. This winding parasitic capacitance will cause the inductor to act as a resonant circuit at some frequency, known as the self-resonant frequency, at which point (and all frequencies above) the component is useless as an inductor. Parasitic elements are often modelled as lumped components in equivalent circuits, but this is not always adequate. For instance, the inter-winding capacitance mentioned above is really a distributed element along the whole length of the winding and not a capacitor in one particular place. Designers sometimes take advantage of parasitic effects to achieve a desired function in a component, see for instance helical resonator or analog delay line. Nonlinear parasitic elements can also arise. The term is commonly used to describe parasitic structures formed on an integrated circuit whereby an unwanted semiconductor device is formed from p-n junctions which belong to two or more intended devices or functions. The parasitic effects in the dielectric of capacitors and parasitic magnetic effects in inductors also include non-linear effects that vary with frequency or voltage and cannot be adequately modelled by linear lumped or distributed components. (en)
- 寄生元件（英語：parasitic element）是电路中电子元件（如電阻、電容及電感）产生的附加元件，而且多半不是设计时想要的。例如，电阻器被设计用来产生阻抗，然而它实际也会产生不需要的寄生电容。 電路中不可避免的會有寄生元件，所有導體都包括電阻及電感，而根據，這樣的導體中一定有電容。元件設計者也無法完全去除寄生元件，只能設法減少寄生元件的影響。 最常見的寄生元件是零件接腳的寄生電阻及電感，以及零件接腳封裝上的寄生電容。對於像變壓器及電感器等繞線元件，最明顯的寄生效應是繞線各匝之間的寄生電容，繞線的寄生電容會使得元件在某特定頻率發生共振，因此元件在該頻率（及更高的頻率）無法發揮電感器的作用。 寄生元件一般都會用集總電路來表示，不過這不一定都適用，例如上述繞線元件中的寄生電容不是在一個特定的位置，比較適合用。有時元件設計者可以利用寄生元件的效應來達到元件特殊的功能，例如。 寄生元件也有非線性的，一般非線性的寄生元件是指在積體電路中的，原因是二個或多個電子元件之間有PN结，因此產生了非设计时想要的電子特性。 (zh)
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