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 D7.14P
To determine
To show: The expression of minimum supply voltage
To find: The value of minimum supply voltage
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Students have asked these similar questions
6b.
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?
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
= 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=1K
Example 7.2
-15
Consider an amplifier circuit using a BJT having Is = 10
power supply Vcc= 10 V.
A, a collector resistance Rc = 6.8 k2, and a
(a) Determine the value of the bias voltage VBE required to operate the transistor at VCE = 3.2 V. What is
the corresponding value of 1?
(b) Find the voltage gain A, at this bias point. If an input sine-wave signal of 5-mV peak amplitude is
superimposed on VBE, find the amplitude of the output sine-wave signal (assume linear operation).
(c) Find the positive increment in UBE (above VBE) that drives the transistor to the edge of saturation,
where UCE = 0.3 V.
(d) Find the negative increment in VBE that drives the transistor to within 1% of cutoff
(i.e., to UCE = 0.99Vcc).
Chapter 7 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
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- Problem 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 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 BE = 0 V. CE,sat a. If R = 0 and V = 3 V, determine the value of V S S b. If R = 5k and V = 3 V, determine the value of V. S S C. If R = 5k , determine the value of V that will cause the BJT to start S +5V Rs Vs O M saturating. Vo R₁=1Karrow_forwardDraw ac equivalent circuits for the following amplifiers. Each circuit should include resistancesand one dependent voltage or current source. a) Common Drain b) Common Emitter with single emitter resistance RE c) Common Gate d) Common Source with RSAC and RSDCarrow_forward
- 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 k2arrow_forwardVo 7) Consider the multi-stage amplifier shown below with its corresponding small signal model. Using the provided small signal model, perform small signal analysis to determine expressions the you would need to determine Av Vin Do NOT solve for Av, just provide the expressions that you would need to determine Av. Write your answer's and show your work! Do NOT make any approximations. Vin Vcc Rd1 M1 Vo1 Vin 2 quot + Vgs gm1 Vgs ro1 Vo1 Vcc WWW www. Rd1 Rc2 Q2 Re2 Vo + 4 Vbe rл2 gm2 Vbe Re2 ro2 Vo Rc2arrow_forwardfor a class B amplifier providing a 20v peak to peak signal to an 8ohm speaker and a power supply of Voc=15v determine;a) input power b) output power c) circuit efficiencyarrow_forward
- QUESTION 7: A BJT diff-amp circuit is biased with a BJT constant- current source Io= 2.32 mA. The BJT constant-current source has an output resistance of Rocs= 4.8 M2. The bipolar transistor parameters are ß = 50 and V4= o. Determine: (a) the differential-mode input resistance, Rid and (b) the common- mode input resistance, Ricm- T7 (kN) Format : 5.69 Rid (kN) Format : 5.45 Ricm (MQ) Format : 335.5arrow_forward1. 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 μFarrow_forwardIn the circuit shown in Figure 1, the input signal vsig is a small sine-wave signal with zeroaverage. The transistor β is 100.Figure 1: BJT Amplifier(a) Draw the equivalent DC circuit (b) Find the value of RE to establish a dc emitter current of about 0.5 mA.(c) Find RC to establish a dc collector voltage of about +0.5 V, (d) For RL = 10KΩ, draw the small-signal equivalent circuit of the amplifier and determineits overall voltage gain. (e) What is the input resistance of the amplifier circuit?arrow_forward
- What is the product of bandwidth called the maximum gain? And its usefulness in testing a common-biased emitter amplifier using the base impedance method ē 7:22 /arrow_forwardQUESTION 1 a) As an electronics engineer, you are given a task to design power amplifier using the Bipolar Junction Transistor (BJT). You are required to get the efficiency of the power amplifier up to 78.5%. Suggest the selected power amplifier's class and sketch the circuit. Discuss one problem that commonly arise with the selected power amplifier and propose the method to improve it. b) One of the commonly used model in small signal ac analysis of transistor network is re model. Explain the steps to obtain the ac equivalent network by sketching the appropriate circuit diagram.arrow_forwardThe circuit shown above is the ac model for a Common Collector amplifier. Determine the value of the following circuit elements. a) ro b) RE c) RL d) gm e) RB f) rπ g) Rsigarrow_forward
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