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  3. 學習啦>創業指南>職場>職場培訓>《電子廠面試常見電器類問題》正文

    電子廠面試常見電器類問題

    時間:2015-10-12 12:11:32本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 文樺 我要投稿

      相對于傳統的OEM或ODM服務僅提供產品設計與代工生產,EMS廠商所提供的是知識與管理的服務,例如物料管理、后勤運輸,甚至提供產品維修服務。

      其實生產的過程中是涉及很多過程及環節,EMS就是一個全線的服務,包括,產品開發、產品生產,這當然包括產品的采購、產品的品質管理及運輸物流,一般 EMS都包括以上這些。但我們開始時,是未夠能力開始整個過程,因此在開始時,我們主要幫助客人處理加工部分,所以只是主理生產部份,這個部份即是所謂的OEM(Original Equipment Manufacture),后期發展到可以幫一部份客戶主理開發產品及設計產品工作,即是所謂的ODM(Original Design Manufacturer)。換言之,ODM比OEM多加了新元素,現時的EMS除了做ODM和OEM所做的事外,更加上物流的部份,甚至有一部分會幫助客戶銷售,這就是一般的EMS。

      今天學習啦小編就將與大家分享:電子廠面試常見電器類問題。
     

      1.描述反饋電路的概念,列舉負反饋的影響及其應用

      答:反饋是將放大器輸出信號(電壓或電流)的一部分或全部,回授到放大器輸入端與輸入信號進行比較(相加或相減),并用比較所得的有效輸入信號去控制輸出,這就是放大器的反饋過程。負反饋對放大器性能有四種影響: 1)降低放大倍數 2)提高放大倍數的穩定性由于外界條件的變化(T℃,Vcc,器件老化等),放大倍數會變化,其相對變化量越小,則穩定性越高。 3)減小非線性失真和噪聲 4)改變了放大器的輸入電阻Ri和輸出電阻Ro 對輸入電阻ri的影響:串聯負反饋使輸入電阻增加,并聯負反饋使輸入電阻減小。對輸出電阻ro的影響:電壓負反饋使輸出電阻減小,電流負反饋使輸出電阻增加。負反饋的應用:電壓并聯負反饋,電流串聯負反饋,電壓串聯負反饋和電流并聯負反饋。
     

      2.最基本的如三極管曲線特性

      答:即晶體三極管的伏安特性曲線:輸入特性曲線和輸出特性曲線。輸入特性是指三極管輸入回路中,加在基極和發射極的電壓Ube與由它所產生的基極電流Ib之間的關系。晶體管的輸入特性曲線與二極管的正向特性相似,因為b、e間是正向偏置的PN結(放大模式下)輸出特性通常是指在一定的基極電流Ib控制下,三極管的集電極與發射極之間的電壓UCE同集電極電流Ic的關系。
     


    電子廠
     

      3.頻率響應,如:怎么才算是穩定的,如何改變頻率響應曲線的幾個方法

      答:頻率響應通常亦稱頻率特性,頻率響應或頻率特性是衡量放大電路對不同頻率輸入信號適應能力的一項技術指標。實質上,頻率響應就是指放大器的增益與頻率的關系。通常講一個好的放大器,不但要有足夠的放大倍數,而且要有良好的保真性能,即:放大器的非線性失真要小,放大器的頻率響應要好。“好”:指放大器對不同頻率的信號要有同等的放大。之所以放大器具有頻率響應問題,原因有二:一是實際放大的信號頻率不是單一的;;二是放大器具有電抗元件和電抗因素。由于放大電路中存在電抗元件(如管子的極間電容,電路的負載電容、分布電容、耦合電容、射極旁路電容等),使得放大器可能對不同頻率信號分量的放大倍數和相移不同。如放大電路對不同頻率信號的幅值放大不同,就會引起幅度失真;  如放大電路對不同頻率信號產生的相移不同就會引起相位失真。幅度失真和相位失真總稱為頻率失真,由于此失真是由電路的線性電抗元件(電阻、電容、電感等)引起的,故不稱為線性失真。為實現信號不失真放大所以要需研究放大器的頻率響應。
     

      4.什么是零點漂移?怎樣抑制零點漂移?

      答:零點漂移,就是指放大電路的輸入端短路時,輸出端還有緩慢變化的電壓產生,即輸出電壓偏離原來的起始點而上下漂動。抑制零點漂移的方法一般有:采用恒溫措施;補償法(采用熱敏元件來抵消放大管的變化或采用特性相同的放大管構成差分放大電路);采用直流負反饋穩定靜態工作點;在各級之間采用阻容耦合或者采用特殊設計的調制解調式直流放大器等。
     

      5.給出一個差分運放,如何相位補償,并畫補償后的波特圖

      答:一般對于兩級或者多級的運放才需要補償。一般采用密勒補償。例如兩級的全差分運放和兩級的雙端輸入單端輸出的運放,都可以采用密勒補償,在第二級(輸出級)進行補償。區別在于:對于全差分運放,兩個輸出級都要進行補償,而對于單端輸出的兩級運放,只要一個密勒補償。

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