The design teaching goal of PDS is to minimize the voltage ripple generated in response to the operating current requirements of the system power supply. All control circuits need to pass current, some circuits have a greater impact on market demand, and some circuits require us to provide a current at a faster rate.1oz vs 2oz With a sufficiently decoupled low-impedance power layer or ground condition and good PCB layering, the voltage ripple caused by the current information requirements of the circuit can be minimized. For example, if the company designs a switching current of 1A and the impedance of the PDS is 10mΩ, the maximum differential voltage ripple is 10mV.

First, you should design a PCB stack structure that supports a larger layer capacitor. For example, a six-layer stack may include a top signal layer, a first ground layer, a first power layer, a second power layer, a second ground layer,how to test a circuit board with a multimeter and a bottom signal layer. The first ground layer and the first power layer are close to each other in the stacked structure, and the spacing between the two layers is 2-3 ml to form a lamellar inherent capacitor. The main advantage of this capacitor is that it is free and only needs to be noted in the PCB manufacturing instructions. If you must split the power layer and have multiple VDD power rails in the same layer, use the largest possible power layer. Don't leave holes, and watch out for sensitive circuits. This will give the VDD layer a larger capacitance. If the design allows for additional layers (in this case from six to eight), two additional ground layers should be placed between the first and second power layers. When the core spacing is 2-3 mm, the inherent capacitance of the cascade structure will be doubled.

For an ideal PCB stack, decoupling capacitors should be used at the initial entry point of the power layer and around the DUT to ensure that the PDS impedance is low over the entire frequency range. Using multiple capacitors from 0.001μF to 100μF helps to cover this range. You don't need capacitors everywhere; Pairing a capacitor with a DUT breaks all manufacturing rules. If such drastic measures are needed, there are other problems in the circuit.

How to quickly distinguish the number of PCB boards on the motherboard

The importance of PCB design in electronic design

Two or three things you may not know about PCBS!

How important is PCB layout?

Posted by: sadabqbn at 03:55 AM | No Comments | Add Comment
Post contains 430 words, total size 3 kb.

異位性皮膚炎是過敏性疾病問題之一，是一種慢性反覆發生的搔癢性皮膚炎，發生原因分析通常與遺傳、體質、環境及食物有關。新生兒容易發生在耳垂及腳背上，皮膚乾、粗、癢是 寶寶異位性皮膚炎三個主要症狀。異位性皮膚炎的發生原因是帶有過敏基因的體質，透過如空氣汙染、黴菌、塵蹣、過敏食物等物質侵入皮膚，進展到皮膚乾、粗、癢，若身體長期接觸這些誘導物或過敏原，久了導致免疫系統產生混亂，皮膚發炎反應就更加劇烈，甚至沒有形成流膿的重症異位性皮膚炎。爸媽可以怎麼做?

1.注意不要讓皮膚過於幹燥：洗澡水溫要避免超過34°C，如果不是特別外出，不要每天都洗，因為很容易洗掉原來皮膚的皮脂。 也避免使用浴乳，浴精，肥皂等，打破皮膚本身的屏障..

2.建議母乳喂養時，可以多吃天然食物，避免人工添加過多的食物，使皮膚菌相具有健全的免疫力，可以緩解異位性皮炎的發生.. 不要害怕使用醫生開發的抗炎或治療軟膏，如果出現異常皮炎。 必要時請遵醫囑..

有助預防嬰兒濕疹或便秘，讓BB快樂成⾧，啟夢童年。

3.寶寶的肌膚應該細緻水嫩，因此當寶寶肌膚出現乾燥粗糙程度甚至脫屑情形，這時候爸媽媽就要有警覺心，可以塗抹乳液於乾燥處。黃醫師提醒，產品上的選擇需要一個成份單純。最好選擇不含中國香料或太多不同添加物，且能保護肌膚水份以及平衡，舒緩。

4.維持家中環境清潔、良好空氣品質：家中盡量不要有燒香、抽菸、點蚊香或或是化妝品、指甲油、香水這些化學物質，因為這些物質會使寶寶的免疫系統處在一個不穩定且容易發炎的狀態。護理師專業示範 寶寶尿布疹居家照顧

寶寶皮膚濕疹哭鬧不停

都是濕疹惹的禍

濕疹的處理方法

嬰兒長濕疹，怎么辦？

關於濕疹的處理方式

Posted by: sadabqbn at 03:35 AM | No Comments | Add Comment
Post contains 18 words, total size 5 kb.