◆Circuit model of IC op-amp(集成运放的电路模型) P Vp-Vy *Ao-Open-loop voltage gain开环电压增益 ≥104 *rInput impedance输入阻抗 r1≥1062 *ro-Output impedance输出阻抗 ro≤1002 *Characteristics of practical op-amp are high gain, high input impedance,low Output impedance,and wide bandwidth.◆Circuit model of IC op-amp (集成运放的电路模型) ＋ － vP ri vo V1 V2 rO Avo (vP －vN ) － ＋ ＋ － － ＋ vN N P ＋ － V+ V- *Avo – Open-loop voltage gain 开环电压增益 *ri – Input impedance 输入阻抗 *rO – Output impedance 输出阻抗 *Characteristics of practical op-amp are high gain, high input impedance, low Output impedance, and wide bandwidth. ≥104 ri ≥106Ω rO ≤100Ω