inverting amplifier Virtual ground 1 2 R 2

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簡易運算放大器電路 反相放大器(inverting amplifier) Virtual ground 虛擬接地 1 2 R 2 I O - =0

簡易運算放大器電路 反相放大器(inverting amplifier) Virtual ground 虛擬接地 1 2 R 2 I O - =0 R 1 i. I+=0 0 V A 3 輸出阻抗 等效電路可畫為 I R 1 輸入阻抗 考慮finite open-loop gain A G I O (自行練習) Input port Output port

用T型回授網路的反相放大器(inverting amplifier with a T-network) 3 2 R 3 1 I R 1 i.

用T型回授網路的反相放大器(inverting amplifier with a T-network) 3 2 R 3 1 I R 1 i. I- =0 i. I+=0 i 4 x i 2 0 V 5 R 4 i 3 4 O A 6

Current-to-Voltage Converter (CCVS) RF Transresistance Amplifier i. I(t) i. I O O RF i.

Current-to-Voltage Converter (CCVS) RF Transresistance Amplifier i. I(t) i. I O O RF i. I Virtual ground Voltage-to-Current Converter (VCCS) i. L I R i. I ZL I O O要在合理範圍 i. L ZL

Weighted Summer (加權加法器) R 1 1 i i 1 Rf R 2 2 n

Weighted Summer (加權加法器) R 1 1 i i 1 Rf R 2 2 n i 2 O Rn in Summing amplifier

儀器放大器(instrumentation amplifier) 增益調整 有現成的IC產品!

儀器放大器(instrumentation amplifier) 增益調整 有現成的IC產品!