畢業(yè)設(shè)計-一種新的基于cv的微電容的檢測方法(存儲版)
【正文】 V) to detect the microcapacitor. Based on analysis on capacitance detection of the circuit model and simulation test results given, It is shown that a circuit of microcapacitor measurment based on C / V is of high sensitivity and low cost and easy for realization. Key word: microcapacitance。 本 文 分析了傳統(tǒng)及現(xiàn)有小電容檢測方法存在的問題，提出一種新的基于 C/V 的微電容的檢測方法。存在的問題是 :此電路要求直流電源電壓穩(wěn)定性要高，輸出電壓信號一般為矩形波， 需要 再配一低通濾波器 才能 得到直流信號。 基于電容 — 電壓的微電容的 運算放大 檢測電路 如圖 1 所示 。 仿真試驗測試 結(jié)果， 本設(shè)計仿真在 環(huán)境下進(jìn)行。實際上，最終輸出值包括傳感器的本體電容和被測電容。s antiracism taskforce, is in London for the Football Association39。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經(jīng)到了尾聲。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告了終結(jié)的邂逅計劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時候是最后又打起了退堂鼓。t really grow up, it seems is not so important。s actions. CSKA said they were surprised and disappointed by Toure39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。因此在設(shè)計中 要 把每個測量電路模塊獨立開，模塊之間用數(shù)字總線連接。 由電路原理，有 ： 2202 2 211 1fx f s f s x fxfi sRj C R j C R C C RUCRU jC? ? ?????? ? ???? （ 1） 若 1xfCR? ，則 根據(jù)（ 1）式， 有： 0 21ssx f xiU C CjC R CU ??? ? ? ? （ 2） 由于 sC 為 xC 的參考電容，其比值相對較小，所以 從（ 2）式可得 ： 0U? 與 iU? 的相位差為： 1()xfarc tg CR?? ? ? （ 3） 0 sixUC? （ 4） 因此，該電路能夠從測量 的 輸出的電壓 通過計算處理。 (4) 線性度好，非線性誤差 小， 高信噪比。 差動脈寬調(diào)制法的工作原理是 :作為傳感器的電容器充放電時，電容量的變化使電路輸出的脈沖寬度隨之變化，經(jīng)低通濾波器得到與被測量相對應(yīng)
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