Lab 13 Feedback amplifiers:Part 2 Experiment:1.Set up quiescent operating point of two-stage amplifier Set the currents I flowing through the collectors are 11≈1.7mAIc2≈2mA Experiment:2.Measure input resistances in open-loop and in closed-loop and compare them. 放大器 Vi R R Fig I measure input resistance The amplifier is loaded by 3.6K Write down the steps: (1)Open-loop input resistancer is (2)Closed-loop input resistance r is Experiment:2.Measure output resistances r in open-loop and in closed-loop and compare them.Lab 13 Feedback amplifiers: Part 2 Experiment: 1.Set up quiescent operating point of two-stage amplifier Set the currents c1 I c2 I flowing through the collectors are 1 2 1.7 2 c c I   mA I mA Experiment: 2. Measure input resistances in open-loop and in closed-loop and compare them. Fig 1 measure input resistance The amplifier is loaded by 3.6K . Write down the steps: (1) Open-loop input resistance i r is . (2) Closed-loop input resistance i r is . Experiment: 2. Measure output resistances o r in open-loop and in closed-loop and compare them