AND CURRENT FEEDBACK OP AMP COMPARISON

Lecture 5
Mạch khuếch đại (OPAMP)
(chapter 5)
Mục tiêu
 Có thể mô tả và sử dụng điện áp và dòng điện trong
các OPAMP lý tưởng.
 Có khả năng phân tích các mạch OPAMP lý tưởng
đơn giản
 Hiểu các mạch có chứa OPAMP: bộ khuếch đại đảo,
bộ khuếch đại tổng hợp, bộ khuếch đại không đảo
ngược, bộ khuếch[r]

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Nếu ñầu vào không ñảo 3 của op-amp nối mass, thì dòng phân cực ib cho ngõ vào ñảo sẽ tạo ra áp lệch giữa 2 ngõ vàovà bản thân dòng phân cực lại thay ñổi theo nhiệt ñộ nên làm cho làm việ[r]

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Ri sẽ bằng dòng qua Rf : ii ≅ if. Nếu ñầu vào không ñảo (3) của op-ampnối mass, thì dòng phân cực ib cho ngõ vào ñảo sẽ tạo ra áp lệch giữa 2 ngõ vàovà bản thândòng phân cực lại thay ñổi theo nhiệt ñộ nên làm cho làm việc thiếu ổn ñịnh. ðể giảm nhỏ ảnhhưởng này, cần mắc ñiện trở R3 vào ñầu và[r]

ñảo.• R2 ñóng vai trò hồi tiếp âm ñể tăng ñộ khuếch ñại AV.• Khi R2 =0, ta có: A=1 => Vo =Vi hoặc R1=∞ ta cũng có A=1 vàVo= Vi . Lúc này mạch ñược gọi là mạch “voltage follower”thường ñược dùng làm mạch ñệm (buffer) vì có tổng trở vào lớn vàtổng trở ra nhỏ như mạch cực thu chung ở BJT.[r]

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