Thought of the Day excellence Commit yourself to

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Presentation transcript:

Thought of the Day excellence Commit yourself to in every part of your life, and never stop striving toward it. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers D.C. Kulshreshtha शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers What is amplification ? Making things bigger or enlarged. You are familiar with some non-electronic amplifiers. Examples are Lever and Pulley System. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers Both amplify force. But, these are working movement reducer or attenuator. Both are passive systems. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers How is an electronic amplifier different from a step-up transformer ? Ans. one is active system, the other is passive electrical system. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers General Symbol शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers BJT Amplifier शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers The Capacitors Two functions : Coupling or Blocking Capacitors. Bypass Capacitors. A capacitor is dc open and ac short. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers Analysis of Amplifier शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers We can then obtain the total current (or voltage) in any branch by simply adding the dc current (or voltage) to the ac current (or voltage). Often it is not needed. The dc analysis is meant only to ensure that the Q-point is suitably fixed. The exact value of Q-point does not matter. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

A Practical CE Amplifier शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers DC Analysis The Q-point is quite in the middle. You don’t need these results any further. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers AC Analysis Two steps : Reduce dc source to zero. Short all capacitors. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers Is this circuit not so simple ? It has only three resistors and no capacitor at all. Are we now ready for ac analysis ? No. There are two alternatives. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers 1. Graphical Method शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers Input signal voltage of 1 mV (peak-to-peak) is not enough for graphical analysis. So, we can take 10 mV (peak-to-peak) signal. To find amplifier gain, we consider the loss of signal due to the source resistance of 600 Ω. We find that शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers

Electronic Amplifiers Review What is amplification ? General Symbol. BJT Amplifier. The Capacitors. Analysis of Amplifier. A Practical CE Amplifier. DC Analysis. AC Analysis. Graphical Analysis. शुक्रवार, 18 जनवरी 2019 Electronic Amplifiers