Question

Lab Preparation . Using DC analysis, and assuming that the transistors (QuEr and Q) are in the active mode, determine the value of RREF required for generating a copy current of 0.755 mA. Take the value of Vcc to be 8 V, and the value of VE in the active mode to be equal to 0.7V. Vee H Qur о RaI Figure 3 Single-stage amplifier biased by a simple current miror device 2. The circuit shown in Figure 3, is a common-emitter amplifier with a load consisting of an NPN current mirror. Assuming now that Early Effect voltage is finite (ie VA ), derive a symbolic expression for the small-signal voltage gain of the circuit 3. Using the value of RREF estimated in the previous step, build a circuit in MultiSim similar to the above circuit. To do that, you will need to design the DC biasing network that will keep the transistors in the active mode. Using simulations measure the voltage gain and compare it with the gain computed above. To help you in that step, proceed with the following steps a) A snapshot of the circuit created in MultiSim has been provided in Figure 4. Use that snapshot to design your circuit in MultiSim. b) Construct the circuit as shown in this figure in MuliSim inserting the Multimeter instruments and the oscilloscopes as shown to allow you to find the values of currents and voltages relevant to the operation of te circuit as an amplifier c) Measure the DC collector current le using XMM3 d) Based on the value of Ic, determine the value of gm. e) Determine the value of the Early Effect parameters (VA) of the transistors You can do that as follows i. Click on the transist or ii. Press the "Edit model" button