
時常收到客人關於OP-AMP的查詢,設計電路時為特定應用選擇正確的運算放大器時仍然感到很困難
新手固然不太能掌握當中原理,就算是有經驗的工程設計師在選擇OP-AMP時,亦有可能忽略了部份參數,而影響了產品的運作,因為有些是通用的,有些則噪聲低,有些則輸入阻抗高,等等。我就用OP-AMP做我第一篇基礎電子知識文章,從分類、應用及線路等,為大家由淺入深刻認識OP-AMP
運算放大器 (Operational Amplifier, 或簡稱op-amp)是許多電子設計的基本組成部分之一。 它們用途廣泛,幾乎可以在運用在任何應用中。使用範圍從簡單地將小信號放大到高級模擬信號處理。 在查看實際op-amp的現實情況的規格之前,將我介紹理想(ideal)的op-amp模型(這對之後的理解非常重要!)。當然,理想的模型只是方便簡化設計中涉及的數學運算,但在實踐中不存在。
查看下面的實際參數時,請先記住這幾項「理想」參數。
像許多IC一樣,op-amp也有多種規格需要牢記。 以下列表細分了運放系列在眾多應用的一般劃分。劃分好,之後對個別應用的參數要求更能容易理解。
最後,如果產品沒有特別要求,我便歸納為「通用」。大多數運算放大器屬於「通用」類別。
如果喜歡我的文章,歡迎贊助我一杯咖啡!
3 replies on “運算放大器 OP-Amp (一)”
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