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 7.135P
To determine
The values of DC emitter current, input resistance
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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
For the circuit shown in Fig. P7.53. draw a complete small-signal equivalent circuit utilizing an appropriate T model for the BJT (use alpha= 0.99). Neglect the transistor output resistance r0. Your circuit should show the values of all components, including the model parameters. What is the input resistance Rin? Calculate the overall voltage gain (vo/vsig).
9. The superposition theorem is applicable to the analysis and design of the dc and ac components of
a BJT network, allowing the analysis of the system's dc and ac responses to be separated.
Select one:TrueFalse
Chapter 7 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
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- Assume that the value of RC is equal to 5900 Find the operation region of the BJT. Show all your work and explain your reasonings.arrow_forwardIt 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 .arrow_forwardIf 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_forward
- A 5-V, 10-MHz oscillator have a rise/falltime of 10ns and a 50% duty cycle is applied to a gate. Determine the value of the capacitance such that the 5th harmonic is reduced by 20 dB in the gate voltage Vg(t).arrow_forward(a) What are the functions of capacitors C1, C2, and C3 as shown ? (b) What is the magnitude of the signal voltage at the emitter of Q1?arrow_forwardGiven 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_forward
- (a) What is the total input capacitance in the circuit as shown if Cπ = 20 pF, Cμ = 1 pF, IC = 5 mA, and RL = 1 kΩ? What is the fT of this transistor? (b) Repeat for IC = 4 mA and RL = 2 kΩ.arrow_forwardThe frequency response of a BJT amplifier is affected by: Select one: a. all of the above b. the coupling and bypass capacitor values c. the supply voltage d. the BJT internal capacitancesarrow_forwardWith the conditions given below, if voltage is v(t) = 8sin4000pit mV, with the osciloscope, What are the Vs, Vd, Hs, and Hd?arrow_forward
- Design the bias-stable circuit in the form of Fig with β = 120 such that ICQ =0.8mA VCEQ =5v and the voltage across RE is approximately 0.7v .arrow_forward3)Determine the gain (Avf) of the following circuit, when a continuous signal is applied at the input of the same. Super the ideal opam and the capacitors initially dischargedarrow_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
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