Four Amplifier Models: Voltage Amplifier *Current Amplifier *Transresistance Amplifier互阻放大 *Transconductance Amplifier互导放大 ◆Voltage Amplifier R:输入电阻 Input resistance Ro:输出电阻 Output resistance Ao:负载开路时的电压增益 Open-circuit Voltage gain *Voltage Amplifier *Current Amplifier ◆Four Amplifier Models: *Transresistance Amplifier 互阻放大 * Transconductance Amplifier 互导放大 ◆Voltage Amplifier Rs + – – Vi + – Vo + Vs R L Rs + – Vs – Vi + – Vo + Ri R L Rs + – Vs – Vi + – Vo + – + Ri AVO Vi R L Rs + – Vs – Vi + R o – Vo + – + Ri AVO Vi R L Ri : 输入电阻 Input resistance RO : 输出电阻 Output resistance AVO : 负载开路时的电压增益 Open-circuit Voltage gain