Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
7th Edition
ISBN: 9780199339136
Author: Adel S. Sedra, Kenneth C. Smith
Publisher: Oxford University Press
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Chapter 7, Problem 7.136P
(a).
To determine
The values of
(b).
To determine
The values of input resistance
(c).
To determine
The values of input resistance
To compare: The value obtained with the values of part (b).
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Chapter 7 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
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- D *7.115 For the circuit in Fig. P7.115, assuming all transistors to be identical with ß infinite, derive an expression for the output current lo, and show that by selecting R1 = R2 and keeping the currents in all junctions equal, the current lo will be Vcc 2R, which is independent of VBg. What must the relationship of RĘ to R1 and R2 be? For VCC= 10 V and VBE = 0.7 V, design the circuit to obtain an output current of 0.5 mA. What is the lowest voltage that can be applied to the collector of Q3? Vcc RE R Figure P7.115arrow_forwardb)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?arrow_forwardFind the values of Ai, Zi, Zo and Av for the given Darlington circuit in below.arrow_forward
- 7) Consider the multi-stage amplifier shown below with its corresponding small signal model. Using the provided small Vo Vin signal model, perform small signal analysis to determine expressions the you would need to determine Av Do NOT solve for Av, just provide the expressions that you would need to determine Av. Show your work! Do NOT make any approximations. Vin + Vgs Vin Vcc Rd1 M1 gm 1 Vgs ro1 Vo1 Vo1 Vcc ww ww1. Rd1 Rc2 Q2 Re2 + Vbe rπ2 Vo www. gm2 Vbe Re2 WWW ro2 ww - Vo Rc2arrow_forwardIn the lectures, we discussed how to use an NPN BJT as an emitter follower. In the circuit below, the emitter follower is connected to a non-ideal voltage source V with a source resistance R. Assume beta = 100, V = 0.7 V, V = 0 V. BE CE,sat a. If R = 0 and V₁ = 3 V, determine the value of V. b. If R = 5k and V = 3 V, determine the value of V. S c. If R = 5k , determine the value of V that will cause the BJT to start S saturating. +5V Rs Vs M Vo R₁=1Karrow_forward1. 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 k2arrow_forward
- For the follower circuit in Fig. P7.137, let transistor Q1 have β = 50 and transistor 2 have β = 100, and neglect the effect of ro. Use VBE = 0.7V (a) Find the dc emitter currents of Q1 and Q2. Also, find the dc voltages VB1 and VB2.(b) If a load resistance RL = 1 kΩ is connected to the output terminal, find the voltage gain from the base to the emitter of Q2, , vo/vb2, and find the input resistance Rib2 looking into the base of Q2. (Hint: Consider Q2 as an emitter follower fed by a voltage Vb2 at its base).(c) Replacing Q2 with its input resistance Rib2 found in (b), analyze the circuit of emitter follower Q1 to determine its input resistance Rin, and the gain from its base to its emitter, ve1/vb1(d) If the circuit is fed with a source having a 100 kΩ resistance, find the transmission to the base of Q1, Vb1/Vsig(e) Find the overall voltage gain Vo/Vsigarrow_forwardProblem In the lectures, we discussed how to use an NPN BJT as an emitter follower. In the circuit below, the emitter follower is connected to a non-ideal voltage source V with a source resistance R Assume beta = 100, V = 0.7 V, V = OV. BE CE,sat a. If R = 0 and V = 3 V, determine the value of V. S b. If R = 5k and V = 3 V, determine the value of V. S = 5k , determine the value of V that will cause the BJT to start c. If R saturating. +5V Rs Vs O- M 550 V₂ R₁=1Karrow_forwardIn the circuit shown , the transistor has a ß of 100, VT = 26mV, and VEB = 0.7V. i) Write the 5 steps required to solve such a problem. ii) Find Rin iii) Use T Model to Find the overall voltage gain (vo/Vsig) iv) For an output signal of +0.4 V, what values of vsig i and vp are required? +5 V +1.5 V ) 10 mA 10 kN Rig 1 kN Vsig Rc 100 Narrow_forward
- A circuit is built around a bi-polar NPN transisor. The base network has a diode and a capacitor in series while the collector is connected to the power supply through a resistor. if the resistor is connected to ground; i) draw the circuit ii) provide all the masking layout of the circuitarrow_forwardIn the lectures, we discussed how to use an NPN BJT as an emitter follower. In the circuit below, the emitter follower is connected to a non-ideal voltage source V with a source resistance R. S Assume beta = 100, V, = 0.7 V, V = OV. BE CE,sat a. (12 points) If R = 0 and V = 3 V, determine the value of V S S b. (12 points) If R = 5k and V = 3 V, determine the value of V S c. (6 points) If R = 5k , determine the value of V_ that will cause the BJT to start S saturating. +5V Rs Vs M Vo R₁=1Karrow_forwardThe input resistance at the base of a biased transistor depends mainly on: Please select one: a. RB b. β_dc and RE c. RE d. β_dcarrow_forward
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