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 9, Problem 9.2P
a.
To determine
The value of the
b.
To determine
The input common mode range when the current source needed the minimum voltage of 0.4V.
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Figure 1 illustrates a BJT amplifier with voltage gain of -115.
a) Identify the capacitors in Figure 1, whose influences are negligible when considering the frequency response over high frequency range of > 1MHz. Explain briefly the reason.
b) Identify the capacitor that needs treatment using the principle of "Miller effect capacitance". Calculate the input and output capacitances.
c) Determine the upper-cut off frequency of the circuit, which is due to the output of the network only
When the ltspice simulation of the circuit shown in the figure is performed, the output voltage (Vout) is obtained as given in which of the figures below?
NOTE-1: Vcc = 12 V, RC = 2.2 kΩ, RB = 15 kΩ, RE = 180 Ω and C1 = 1 μF.
NOTE-2: For the input voltage Vin, the DC offset voltage is 1.6 V, while the applied sinusoidal signal has a amplitude of 10 mV and a frequency of 10 kHz.
The ac equivalent circuit for an amplifier is shown . Assume the capacitors have infinite value, RI = 10 kΩ, RB = 5 MΩ, RC = 1.5 MΩ, and R3 = 3.3 MΩ. Calculate the input resistance and output resistance for the amplifier if the BJT Q-point is (2 μA, 2 V). Assume βo = 40 and VA = 50 V.
Rework the given problem if IC is increased to 100 μA, and the values of RC, RB, and R3 are all reduced by a factor of 50.
Chapter 9 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
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- 1. For an electronic device operating at a temperature of 17°C with a bandwidth of 10 kHz, determine:a. ThermalnoisepowerinwattsanddBm.b. Rmsnoisevoltagefora100Ωinternalresistance. 2. Two resistors, 20 kΩ and 50 kΩ are at ambient temperature. Calculate for a bandwidth equal to 100 kHz, the thermal noise voltage for the tworesistors connected in parallel.arrow_forwardQ.9: Consider the ac circuit in Fig. Q9. Derive the closed-loop gain ??/?sarrow_forwardA differential amplifier connected in the circuitas shown has the parameters listed below withRI = 5 kohm and RL = 600ohm . (a) Find the overallvoltage gain Av, current gain Ai , and power gainAP for the amplifier, and express the results in dB.(b) What is the amplitude VI of the sinusoidal inputsignal needed to develop a 20-V peak-to-peaksignal at vo?Input resistance Rid = 1 M Output resistance Ro = 25 A = 60 dBvi = VI sin ωtarrow_forward
- For a BJT differential amplifier, show a step-by-step explanation of the derivation of the formula for the following: A. Voltage Gain B. Current Gain C. Input Impedance D. Output Impedancearrow_forwardThe ac equivalent circuit for an amplifier is shown . Assume the capacitors have infinite value, RI = 10 kΩ, RB = 5 MΩ, RC = 1.5 MΩ, and R3 = 3.3 MΩ. Calculate the input resistance and output resistance for the amplifier if the BJT Q-point is (2 μA, 2 V). Assume βo = 40 and VA = 50 V.arrow_forwardFor the system defined by the first-order differential equation: Draw the log magnitude (dB)-log frequency graph of H(jw). (The phase graph is not required. The frequency axis is expected to be logarithmic when drawing the log magnitude graph.) The input is assumed to be suppressed when the magnitude of H(jw) is -40dB. It is given that the x(t)=coswat signal is suppressed by this system. What is the smallest value of wa in this case?arrow_forward
- (a) The signal voltage applied across the gatesource terminals of an MOS transistor is given by υgs = VM sin 5000πt, and VGS − VT N = 0.75 V.Calculate the total harmonic distortion in the drain current of the MOSFET based upon Eq. 13.70 if VM = 150 mV. (b) repeat for VM = 300 mV.(c) Repeat for VM = 75 mV.arrow_forwardFor a non -inverting operational amplifier, Rf = 80 kΩ , Ri = 6 kΩ fT = 2.35 MHz, Determine the closed loop lower critical frequency fc(cl) in kHzarrow_forwardThe ac equivalent circuit for an amplifier is. Assume the capacitors have infinite value, RI = 10 kΩ, RB = 5 MΩ, RC = 2 MΩ, and R3 = 3.3 MΩ. Calculate the voltage gain for the amplifier if the BJT Q-point is (1 μA, 1.5 V). Assume βo = 40 and VA = 50 V. Rework the given problem if IC is increased to 10 μA, and the values of RC, RB, and R3 are all reduced by a factor of 10.arrow_forward
- Please answer correctly and as soon as possible. I'll give upvote. Thank you. In the common emitter amplifier given, R1=50Ω, R2=1kΩ and CL=1pF. Determine the quiescent collector current, ICQ, needed such that the unity gain frequency, fu, is equal to 2.4 GHz. Show the complete solution and state all assumptions. The BJT parameters are as follows: β→∞,VA→∞, and Cπ=50 femtofarad (fF). Ignore all other parasitic capacitances and use VT=26mV.arrow_forward@sync1 What is the resulting SQNR for a signal uniformly distributed on [−5, 5] when uniform?arrow_forward(a) The transistors in the differential amplifier as shown are biased at a collector current of 18 μA, and RC = 430 kΩ. The transistors have fT = 75 MHz, Cμ = 0.5 pF, and rx = 500 Ω. What is the bandwidth of the differential amplifier? (b) Repeat if the collector current is increased to 50 μA and RC is reduced to 140 kΩ.arrow_forward
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