去耦电容是電路中裝設在元件的電源端的電容，此電容可以提供較穩定的電源，同時也可以降低元件耦合到電源端的噪聲（解耦），間接可以減少其他元件受此元件噪聲的影響。
在共享导体的电路中，共享电源的时候，当一个器件需要对外提供输出的时候就会同时拉低该导体的电压，产生噪声耦合到共享的电路中。在有噪声的环境中，这些電磁波会在导体内感应出电压信号，影响回路中的元件。在数位电路中，器件容易在临界位置由于干扰而产生错误的信号，从而产生错误的动作。去耦电容可以減少以上情形的發生。
去耦电容一般都安置在元件附近的电源处，以減少布线阻抗對滤波效果的影響。去耦电容多使用陶瓷电容，其数值由电压信号最快上升和下降速度确定。
參考來源
外部連結
- [http://www.ultracad.com/mentor/esr%20and%20bypass%20caps.pdf ESR and Bypass Capacitor Self Resonant Behavior: How to Select Bypass Caps] – article written by Douglas Brooks
- [http://www.hottconsultants.com/techtips/decoupling.html Decoupling] – decoupling guide for various frequencies by Henry W. Ott
- [http://www.ultracad.com/articles/todd_h.pdf Bypass Capacitors, an Interview With Todd Hubing] – by Douglas Brooks, President, UltraCAD Design, Inc.
- [https://web.archive.org/web/20120213101028/http://www.intersil.com/data/an/an1325.pdf Choosing and Using Bypass Capacitors] – application note from Intersil
- [http://www.designers-guide.org/Design/bypassing.pdf Power Supply Noise Reduction] – how to design effective supply bypassing and decoupling networks by Ken Kundert
- [http://learnemc.com/circuit-board-decoupling-information Circuit Board Decoupling Information] – decoupling guidelines for various types of circuit boards
- [http://postreh.com/vmichal/papers/high_voltage_active_decoupling_capacitor.pdf Active Decoupling Capacitor] – Circuit allowing reduce volume of high voltage electrolytic capacitors
- [https://web.archive.org/web/20111002150401/http://www.ieee.li/pdf/viewgraphs/minimizing_crosstalk_wiring_cabling.pdf Minimizing Crosstalk in Wiring and Cabling] – presentation by Richard J. Mohr at the IEEE Long Island EMC Section Meeting
- [https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/wp/wp_sgnlntgry.pdf Basic Principles of Signal Integrity] – Altera whitepaper
参见
*
*陶瓷电容
*E系列數字
评论 (0)