Draw and explain the transistor amplifier, which is usually referred as emitter follower. Also, (i) derive its voltage and current gains by equivalent circuit; (ii) compare its voltage and current gains with other transistor amplifiers.
Question 1:
Draw and explain the transistor amplifier, which is usually referred as emitter follower.
Also,
(i) derive its voltage and current gains by equivalent circuit;
(ii) compare its voltage and current gains with other transistor amplifiers.
Question 2:
(a) Predict the name of the curve drawn between ID and VGS of the JFET and represent the cut off voltage in it.
(b) E-MOSFET has ID(on) = 600mA (minimum) at VGS = 9V and VGS(th) = 1 V. Find the drain current for VGS = 6 V.
Question 3:
(a) State the name of the power amplifier, which has a efficiency as 10% in practical case and also derive and prove its theoretical efficiency is 25%.
(b) Explain the role of Q point in power amplifiers based on its location in AC load line.
Question 4:
(a) certain cascaded amplifier arrangement has the following voltage gains: Av1 = 5, Av2 = 10 and Av3 = 15. What is the overall voltage gain? Also express each gain in decibels (dB) and determine the total voltage gain in dB.
(b) Explain with neat diagram of a multistage amplifier, which has better response at lower frequencies.
Question 5:
(a) Name the MOSFET which can be operated only in enhancement mode and briefly explain the operation of that MOSFET with neat diagrams.
(b) Determine the drain-to-source voltage in the circuit of figure and predict the type of the MOSFET from
its symbol. The MOSFET datasheet gives VGS(off) = -7 V and IDSS = 11 mA.
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