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Common Emitter BJT Amplifier Design Current Mirror Design - dheeraj rao - 08-16-2017 Common Emitter BJT Amplifier Design Current Mirror Design [attachment=16721] Some Random Observations Conditions for stabilized voltage source biasing Emitter resistance, RE, is needed. Base voltage source will have finite resistance, RB. needs to be much larger than RB. Small RB - relative to RS - will attenuate input signal. Larger RE permits larger RB, but results in lower gain. Gain = -RC/RE for RE >> re. Split RE with bypassing increases gain. Requires large bypass capacitor. Limiting case - entire RE bypassed: Gain = - gmRC. Bias Setting 1. Since RB does not interfere with the bias, the signal source can be connected to the base without need for a blocking capacitor. 2. Choose Rb large compared to RS to avoid attenuating vsig. 3. Choose Rref to set IC Gain Setting 1. Connect the source to the base. 2. Provide a path for the small signal emitter current. 3. Choose RE for the desired gain (G = - RC/RE). 4. CE is nearly a short circuit for f fmin Calculate CE to have negligible reactance at the lowest frequency of interest fmin. |