基于開(kāi)關(guān)電容技術(shù)的鎖定放大器設(shè)計(jì)
所屬分類(lèi)：技術(shù)論文
上傳者：serena
標(biāo)簽： 鎖定放大器 開(kāi)關(guān)電容
所需積分：1分積分不夠怎么辦？
文檔介紹：鎖定放大是微弱信號(hào)檢測(cè)的重要手段?；谙嚓P(guān)檢測(cè)理論，利用開(kāi)關(guān)電容的開(kāi)關(guān)實(shí)現(xiàn)鎖定放大器中乘法器的功能，提出開(kāi)關(guān)電容和積分器相結(jié)合以實(shí)現(xiàn)相關(guān)檢測(cè)的方法，并設(shè)計(jì)出一種鎖定放大器。該鎖定放大器將微弱信號(hào)轉(zhuǎn)化為與之相關(guān)的方波，通過(guò)后續(xù)電路得到正比于被測(cè)信號(hào)的直流電平，為后續(xù)采集處理提供方便。測(cè)量數(shù)據(jù)表明鎖定放大器前級(jí)可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓，后級(jí)通過(guò)帶通濾波器級(jí)聯(lián)可將信號(hào)放大1×105倍。該方法在降低噪聲的同時(shí)，可對(duì)微弱信號(hào)進(jìn)行放大，線性度較高、穩(wěn)定性較好。 Lock-in Amplifying（LIA）is one of important means for weak signal detection. Based on cross-correlation detection theory， switch in the swithched capacitor was used as multiplier of LIA， and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave， then DC proportional to measured signal was obtained through follow-up conditioning circuit， providing convenience for signal acquisition and processing. The measured data shows that the electric current（10-6 A） can be changed into voltage（10-1 V） by LIA， and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the w
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