2.2 The ideal Op-Amp Characteristics of the ideal OP-Amp *Av0=∞ P oV: :=∞ Vp Avo(VP-N ro=0 BW=∞ +6Z V2 Transfer characteristics ①在线性区：p-→0 +'om≈y, ②在线性区： 线性区 饱和区 p->0→v。=+Vom≈V+ p-<0+v。=-Vm≈y 饱和区 VP-UN 'om≈V 实际线性应用一引入负反馈
+Vom ≈V+ -Vom ≈Vvo vp -vN 0 2.2 The ideal Op-Amp ◆Characteristics of the ideal OP-Amp * AVO =∞ ri =∞ rO =0 BW=∞ ＋ － vP vo V1 V2 AVO (vP －vN ) － ＋ ＋ － － ＋ vN N P ＋ － V+ V- ◆ Transfer characteristics vP－vN >0 → vo =+Vom≈V+ vP－vN <0 → vo = -Vom≈V- 实际线性应用—引入负反馈 饱和区 线性区 饱和区 ①在线性区: vP－vN → 0 ②在线性区:
◆虚短与虚断 Virtual short circuit and Virtual open circuit *IC0p-amp工作在线性区 。1wp-W一Ao=o1pyw小心有限值 (yp-y=0+虚短yp=yN ip-=0 *ICop-ap工作在线性区 O =∞→流入或流出同相 输入端和反相输入端的 0 电流为0→虚断p=i=0 动画演示 Virtual short circuit-not physically connected Virtual open circuit -not physically open
◆虚短与虚断 Virtual short circuit and Virtual open circuit *IC op-amp工作在线性区 vo =AVO (vP -vN ) AVO = vo / (vP - vN )=∞ (vP - vN )=0 虚短 vP =vN vo有限值 *IC op-amp工作在线性区 ri =∞ 流入或流出同相 输入端和反相输入端的 电流为0 虚断 iP =iN =0 *Virtual short circuit - not physically connected Virtual open circuit - not physically open iP =0 vP vN iN =0 v + O 动画演示