The NMOS transistor in the source-follower circuit of Fig. 5 has gm-5mA/V and a large ro. Find the open-circuit voltage gain and the output resistance. 10 kn Fig. 5

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For a Darlington pair -as an example for compound transistor configuration, show (by derivation) that the beta of this pair is the product of the beta for each transistor. Hence, Darlington pair has a very high beta or current gain.

b)The transistor consists of three terminals. The main reason for designing configurations is that it requires four terminals in order to provide the input and the output connections of the circuit for effective amplification. Now in your own words describe how Bipolar Transistors Transistor ( BJT ) various configurations are designed with relating diagrams. In your own estimation evalute which one is most widely used when looking at appreciable output for an amplifier?

Kk137.

1. Assume that the source voltage for the D-MOSFET in the following figure is measured and found to be 1.6 V. a. Compute lo and Vos- b. If gm = 2000 umho, what is the voltage gain? c. Compute the input resistance of the amplifier. d. Is the D-MOSFET operating in the depletion or the enhancement mode? 100 my pp 1.0 kHz HI C₁ 0.1 µF R₁ 5.1 ΜΩ R₂ 10 ΜΩ +VDD +24 V ① RD 2.7 C3 Rs 330 Ω OV ORI C₂ 33 μF

1. A small-signal amplifier (a) Uses only a small portion of its load line (c) Goes into saturation once on each input cycle (b) always has an output signal in the mV range (d) is always a common-emitter amplifier 2. The parameter h fe corresponds to (a) BDc (b) Bac (c) r'e (d) r'c 3. If the de emitter current in a certain transistor amplifier is 3 mA, the approximate value of r: is (a) 3 k2 (h) 3 2 (c) 8.33 2 (d) 0.33 k2 4. A certain common-emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed, (a) The circuit will become un stable (b) the voltage gain will decrease (d) the Q-point will shift (c) The voltage gain will increase 5. For a common-collector amplifier, RE =1002, r'e= 10 2, and Bac=150. The ac input resistance at the base is: (a) 1500 Q (b) 15 kN (c) 110 N (d) 16.5 k2

B= infinity, Assume BJTs are identical. Find R such that a DC current of 0.25mA for transistors Q1 and 2. Find Rc that results in 3V DC at he collectors of Q1 and 2. Find the differential voltage gain.

4. For the current source shown, assume a beta of 75 and an r. of 50k2 for all transistors. Vee 12 RAEF ROAD 5K What is IREF? REF loUT What value of Rws will give an loUT of 1mA? Rws What is the output impedance of this source? What's the highest value of RLOAD that this current source can drive? What's the lowest value of RLOAD that this current source can drive?

Answer the question correctly with neat handwriting and show some explaination.