A. Design and simulate a CE amplifier using the 4-resirsor bias circuit. Use the 2N3904 BST, with theft and Va you determined in Part I, and either 12 V or 12 V power supplies, your choice. Choose one of the three sets of specifications below. Note: if you plan to test your arson with the AM, that device only minions irS V. You will need to use thou power supply values in your design. It will be difficult to achieve a gain of more than 100.]
(0,1 E 100 and Rm> 100k52 fifi Ad 150 and Ri, > 75 Ea (ui) A. >200 and Re> 50 ED Gains are not in dB
Assume Et = 0 and 123 013 for your calculations and use standard resistor values. Calculate the Q-point, Ar, Ran and Rua. Show your design procedure clearly. You will need to choose some values and solve for others, and you should explain the reasons for your choices. I suggest designing with some totemic, e.g., maybe 10% more gain and Re than specified
A basic procedure might follow these stew
- Start with the specifications for Ar and Re, and with the transistor characteristics p and VP
- Determine the small-signal parameters n and gm that you need to meet the specs
- Choose a Q-point that gives you the small-signal parameters you need and a good output range
- Decide if you need an tm-bypasud RE in the ac circuit to satisfy the specs or not
- Design the 4-resistor bias circuit to give the fi-point and meet Al gain and Bo requirements
B. Simulate your design and compare with your calculations and with the specifications. The simulations should include DC operating point, ac simulations of Ar, Re and Run and a transient simulation demonstrating an undistorted output. We will define 5undistoned- as THD 51%. Be sure to note what input you needed to use to get an undistorted output. Then repeat the gain simulation with Iii = 1 Ira and Rt 100 1. and comment on the effect.