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Class 21

Class 21. Problem 3 The following data of an asymmetrical amplifier are given: A voc =-50; R g =0.5k  ; R in =R o =R L = 2 k  . The next resulting parameters are to be realised by the use of negative feedback: A i *=5; R in *  0.5k  ; R o *  5k  .

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Class 21

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  1. Class 21 • Problem 3 • The following data of an asymmetrical amplifier are given: • Avoc=-50; Rg=0.5k; Rin=Ro=RL = 2 k. • The next resulting parameters are to be realised by the use of negative feedback: • Ai*=5; Rin*0.5k; Ro*5k. • Determine the type of the feedback, the transfer factor of the feedback network and the realised values of Rin* and Ro*.

  2. Class 21 • Way of solution: • 1. Short circuit current gain • 2. Current gain • 3. H calculation from Ai* • 4. ßiof the feedback network • 5. Calculating Rin* • 6. Calculating Ro* • 7. Evaluation

  3. g21vB iB iC vi 1/g11 vB Rg RB RC RL vg RE vo S-C feedback Class 21 • Applying the feedback theory to CE

  4. Class 21 • The negative feedback of one-pole amplifiers • One-pole amplifier definition • Conditions about the feedback circuit • The closed-loop gain introducing the DC loop gain • The so called gain band-width product is independent of the feedback

  5. A, dB 3 dB A0 A -20 dB/D 1+A0 3 dB A0*  1/ A* 0 0* (log)  A,  if A0 1 0 -45 A* A -90 Class 21 • Graphical representation on Bode plot

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