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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It is required to design the bias circuit of Fig. 7.52 for a BJT whose nominal β=100.
(a) Find the largest ratio (RB/RE) that will guarantee IE remains within ±5% of its nominal value for β as low as 50 and as high as 150 .
7.135 For the emitter follower in Fig. P7.135, the signalsource is directly coupled to the transistor base. If the dccomponent of vsig is zero, find the dc emitter current. Assumeβ =100. Neglecting ro, find Rin, the voltage gain vo/vsig, thecurrent gain io/ii, and the output resistance Rout.
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/Vsig
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- If the collector supply voltage is increased to 15 V in Fig. 7-30b, what is the collector-emitter voltage for VBB = 1.8 V?arrow_forwardFind the short-circuit time constants and fL for the common-source amplifier As Shown if ID = 1.5 mA and VGS−VTN = 0.5 V. Assume λ = 0.015/V. The other values remain unchanged.arrow_forwardA C-S amplifier is operating from a single 18-V supply. The MOSFET has Kn = 1 mA/V2. What is the Q-point current required for a voltage gain of 30?arrow_forward
- a. What collector current is required for a bipolar transistor to achieve a transconductance of 5.5 mS ? Use VT=0.026V and express your answer in µA up to 2 decimal places. b. A transistor operating with nominal gm of 80 mS has a ββ that ranges from 50 to 150. Also, the bias circuit, being less than ideal, allows a 20% variation in ICIC. What is the smallest value found of the resistance looking into the base, in kΩkΩ? Use VT=0.026VT=0.026V and express your answer up to 3 decimal places. c. Given that a BJT is biased to have a small signal input resistance rπ = 25 kΩkΩ with β = 100, what is the BJT's transconductance gmgm? Use VT=0.026VT=0.026V and express your answer in mS and up to 2 decimal places.arrow_forwardFill in the Blanks.4. A ______________ device employs a unique combination of a p-channel and an n-channel MOSFETwith a single set of external leads.5. For most BJT configurations the dc analysis begins with a determination of the _________ current.6. For the dc analysis of a transistor network, all capacitors are replaced by an _____ circuit equivalent .7. The ___________ bias configuration is probably the most common of all the configurations due to its less sensitivity to changes in beta from one transistor to another.arrow_forwardThere is a requirement to design a transistor amplifier circuit which gives a voltage amplification of 25dB. What are the further details that you as a designer require in order to complete the design process? If the input to the amplifier above is , what is the output? Sketch a suggested configuration for the amplifier circuit and plot both input and output signals on the same axes.arrow_forward
- Given a transistor amplifier of gain ß = 100 with emitter bias, determine the values of Rb and Re given that Rc is equal to 1 kΩ. The voltage gain without capacitor CE must equal Av = -2.6 and the gain with capacitor CE must equal Av= -180. Calculate the voltages VCE and Vcb using the values calculated earlier Note:it is not necessary to consider a Vcc value to determine what is requested in questionarrow_forwardThe steady state operation of a transistor depends a great deal on its base current, collector voltage, and collector current values and therefore, if the transistor is to operate correctly as a linear amplifier, it must be properly biased. In your level of understanding, explain how important biasing transistor in a given working electronic Circuit is. Explain also the consequence when such transistor does not biases properlyarrow_forwardConsider the following circuit. Find the required value of RC to operate the BJT on the boundary between F.A and saturation regions. Assume that the value of VCE is 0.2 V at the boundary of F.A and saturation regions.arrow_forward
- For the circuit shown in Fig. 8(c), find the collector current IC and VCE Use beta = 50 and VBE=0.7Varrow_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_forwardThe bipolar differential amplifier as shown is biased by a 75-μA current source with an output resistance of 1MΩ. If the transistors have Early voltages of 60 V, estimate values of Rod, Roc, idm, and icm.arrow_forward
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