HFC Active Devices module test

Q.5/ Refer to the class AB amplifier in figure below operating with a single power supply: a. Find the de parameters VB(Q1), VB(Q2), VE, IcQ, VCEQ(QI), VCEQ(Q2). b. Assuming the input voltage is 10oVpp, calculate the power delivered to the load resistor. c. What faults causing the following troubles: 1. A positive half-wave output signal 2. OV on both bases and emitters 3. No output: emitter voltage =15V 4. Crossover distortion on the output. Vcc +15 V R 1.0 kN C3 C2 D2 Q2 RL V 75 N 1.0 kN

6) Consider the following multistage amplifier. Draw the corresponding small signal model. Label, Vin, Vo1 and Vo. Do NOT make any approximations. Do NOT perform small signal analysis with this model. Just draw the small signal model. Show your work! Vin Vcc malli Q1 Re1 Vo1 Vcc ww1. Rc2 Q2 Re2 Vo

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II.The following figure shows a class AB amplifier. (a) Determine the parameters of dc VB (Q1), VB (Q2), VE, ICQ, VCEQ (Q1), VCEQ (Q2). (b) For a 5-Vrms input, determine the power that is provided to the load resistor, and (c) Draw the output signal +Vcc +9 V 1.0kn D: R 5.0 V rms R2 10 kN -Vec

(1) Describe in detail the relative advantages of Class A and Class B amplifiers. In what types of circuits would Class B be advantageous over Class A (1I) With the aid of signal diagrams, describe two forms of distortion you would expect to observe on an output signal of a Class B amplifier. (III) Describe in circuit terms the advantages of a Class AB amplifier.

= 10 V: In the differential pair amplifier circuit shown below, IEE = 1 mA and V‚n ² Vcc Vin1Q₁ Vout Q2/ IEE Vin2 a) Determine the differential voltage gain ADM of the circuit. b) Repeat part a) if the top current sources are replaced with resistors Re = 1.5 kn. c) Repeat part a) if the top current sources are replaced with pnp-BJT current sources with VAP = 25 V. A.p

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Q.5/ Refer to the class AB amplifier in figure below operating with a single power supply:a. Find the dc parameters VB(Q1), VB(Q2), VE, ICQ, VCEQ(Q1), VCEQ(Q2).b. Assuming the input voltage is 10Vpp, calculate the power delivered to the load resistor.c. What faults causing the following troubles:1. A positive half-wave output signal2. 0V on both bases and emitters3. No output: emitter voltage =15V4. Crossover distortion on the output.

Design a linear amplifier, based on a bipolar junction transistor 2N3904 in common emitter configuration. The supply voltage is 28V. The quiescent operating collector current for the amplifier should be around 10mA. The data sheet for the transistor shows that the DC current gain at this operating current is about 200. Draw the circuit diagram of your design. Label all the components in the circuit. Show all the voltages and currents that you use for calculations in your design. Label them using consistent naming convention.

1.7. In a single transistor based amplifier (a) Source in a common source w/o degeneration is at DC ground but not AC ground (b) Source in a common source with degeneration is at AC ground but not DC ground (c) Input voltage is commonly connected to the gate (d) Drain in a common source w/o degeneration is at AC ground but not at DC ground 1.8. In a positive voltage system (all DC voltages in circuit >0V) (a) For a common gate amplifier, maximum small signal current occurs in saturation (b) Gate terminal is both DC ground and AC ground (c) Current gain of the common gate stage is approximately unity (d) Drain of a common drain NMOS based amplifier is connected to max voltage 1.9. In a single transistor based amplifier (a) Common source with degeneration is used to increase output impedance (b) Common source amplifier with degeneration does not provide phase inversion (c) The maximum intrinsic gain of basic CS amplifier w/o degeneration is independent of biasing condition (d) CG stage…