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computer science
systems analysis and design 12th
Questions and Answers of
Systems Analysis And Design 12th
A diff-amp is biased with a constant-current source \(I_{Q}=0.25 \mathrm{~mA}\) that has an output resistance of \(R_{o}=8 \mathrm{M} \Omega\). The bipolar transistor parameters are \(\beta=120\) and
The transistor parameters for the circuit shown in Figure P11.29 are \(\beta=180, V_{B E}\) (on) \(=0.7 \mathrm{~V}\) (except for \(\left.Q_{4}\right), V_{A}=\infty\) for \(Q_{1}\) and \(Q_{2}\), and
Figure P11.30 shows a two-stage cascade diff-amp with resistive loads. Power supply voltages of \(\pm 10 \mathrm{~V}\) are available. Assume transistor parameters of: \(\beta=100, V_{B E}\) (on)
For the differential amplifier in Figure P11.31 the parameters are \(R_{1}=50 \mathrm{k} \Omega\) and \(R_{D}=24 \mathrm{k} \Omega\). The transistor parameters are: \(K_{n}=0.25 \mathrm{~mA} /
The bias voltages in the diff-amp shown in Figure P11.31 are changed to \(V^{+}=3 \mathrm{~V}\) and \(V^{-}=-3 \mathrm{~V}\). The transistor parameters are \(K_{n 1}=K_{n 2}=\) \(100 \mu \mathrm{A} /
The transistor parameters for the differential amplifier shown in Figure \(\mathrm{P} 11.33\) are \(V_{T N}=0.5 \mathrm{~V}, k_{n}^{\prime}=80 \mu \mathrm{A} / \mathrm{V}^{2}, W / L=4\), and
The diff-amp in Figure P11.34 has parameters \(V^{+}=3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}\), and \(I_{Q}=0.18 \mathrm{~mA}\). The transistor parameters are \(V_{T N}=0.35 \mathrm{~V},
The bias voltages of the diff-amp shown in Figure \(\mathrm{P} 11.35\) are \(V^{+}=5 \mathrm{~V}\) and \(V^{-}=-5 \mathrm{~V}\). The threshold voltage of each transistor is \(V_{T N}=0.4
The circuit parameters of the diff-amp shown in Figure 11.19 are \(V^{+}=3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}\), and \(I_{Q}=0.15 \mathrm{~mA}\). The transistor parameters are \(K_{n}=0.2 \mathrm{~mA}
Consider the normalized dc transfer characteristics of a MOSFET diff-amp shown in Figure 11.21. Assume that \(K_{n}=0.20 \mathrm{~mA} / \mathrm{V}^{2}\) and \(I_{Q}=0.10 \mathrm{~mA}\). Determine the
The parameters of the diff-amp circuit shown in Figure P11.38 are \(V^{+}=9 \mathrm{~V}\), \(V^{-}=-9 \mathrm{~V}, R_{D}=510 \mathrm{k} \Omega\), and \(R_{S}=390 \mathrm{k} \Omega\). The transistor
Consider the circuit shown in Figure P11.39. The circuit and transistor parameters are \(V^{+}=+3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}, R_{D}=360 \mathrm{k} \Omega, I_{Q}=12 \mu \mathrm{A}\), \(V_{T
The circuit and transistor parameters for the circuit shown in Figure P11.39 are \(V^{+}=5 \mathrm{~V}, V^{-}=-5 \mathrm{~V}, I_{Q}=0.15 \mathrm{~mA}, R_{D}=30 \mathrm{k} \Omega, V_{T P}=-0.5
Consider the differential amplifier shown in Figure P11.41 with mismatched drain resistors. The circuit and transistor parameters are \(V^{+}=\) \(+10 \mathrm{~V}, V^{-}=-10 \mathrm{~V}, R_{D}=50
Consider the differential amplifier shown in Figure P11.42 with mismatched transistors. The mismatched transistors result in mismatched transconductances as shown. The circuit and transistor
Consider the circuit in Figure P11.43. The transistor parameters are \(K_{p}=1.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T P}=-0.6 \mathrm{~V}\), and \(\lambda=0\). Determine \(v_{S}, v_{D 1}\), and \(v_{D
(a) Design the circuit shown in Figure P11.44 such that \(v_{O}=v_{D 1}-v_{D 2}=\) \(1 \mathrm{~V}\) when \(v_{1}=-50 \mathrm{mV}\) and \(v_{2}=+50 \mathrm{mV}\). The transistor parameters are \(V_{T
The Hall effect experimental arrangement was described in Example 11.4. The required diff-amp is to be designed in the circuit configuration in Figure P11.35. The transistor parameters are \(V_{T
Consider the diff-amp in Figure P11.46. The transistor parameters are: \(K_{n 1}=K_{n 2}=50 \mu \mathrm{A} / \mathrm{V}^{2}, \lambda_{1}=\lambda_{2}=0.02 \mathrm{~V}^{-1}\), and \(V_{T N 1}=V_{T N
Consider the circuit shown in Figure P11.47. Assume that \(\lambda=0\) for \(M_{1}\) and \(M_{2}\). Also assume an ideal current source \(I_{Q}\). Derive the expression for the one-sided differential
Consider the diff-amp shown in Figure P11.48. Assume \(\lambda_{1}=\lambda_{2}=0\) and assume the current source has an output resistance of \(R_{o}\). (a) Derive the expression for the
The bias voltages of the diff-amp circuit shown in Figure 11.19 are \(V^{+}=5 \mathrm{~V}\) and \(V^{-}=-5 \mathrm{~V}\), and the bias current is \(I_{Q}=0.2 \mathrm{~mA}\). The transistor parameters
Consider the small-signal equivalent circuit in Figure 11.23. Assume the output is a two-sided output defined as \(V_{o}=V_{d 2}-V_{d 1}\), where \(V_{d 2}\) and \(V_{d 1}\) are the signal voltages
Consider the MOSFET diff-amp with the configuration in Figure P11.33. The circuit parameters are \(V^{+}=3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}\), and \(I_{Q}=0.2 \mathrm{~mA}\). The transistor
Consider the bridge circuit and diff-amp described in Problem 11.27. The BJT diff-amp is to be replaced with a MOSFET diff-amp as shown in Figure 11.19. The transistor parameters are \(V_{T N}=0.4
Figure P11.53 shows a two-stage cascade diff-amp with resistive loads. Power supply voltages of \(\pm 10 \mathrm{~V}\) are available. Assume transistor parameters of \(V_{T N}=1 \mathrm{~V},
Figure P11.54 shows a matched JFET differential pair biased with a current source \(I_{Q}\). (a) Starting with\[i_{D}=I_{D S S}\left(1-\frac{v_{G S}}{V_{P}}\right)^{2}\]show that\[\frac{i_{D
A JFET differential amplifier is shown in Figure P11.55. The transistor parameters are: \(V_{P}=-4 \mathrm{~V}, I_{D S S}=2 \mathrm{~mA}\), and \(\lambda=0\). (a) Find \(R_{D}\) and \(I_{Q}\) such
Consider the JFET diff-amp shown in Figure P11.56. The transistor parameters are: \(I_{D S S}=0.8 \mathrm{~mA}, \lambda=0\), and \(V_{P}=-2 \mathrm{~V}\). (a) Determine \(I_{S}\), \(I_{D 1}, I_{D
Consider the circuit in Figure P11.57. Assume that \(\lambda=0\) for the transistors, and assume an ideal current source \(I_{Q}\). Derive the expressions for the one-sided differential-mode gains
The circuit parameters for the diff-amp shown in Figure 11.30 are \(V^{+}=3.3 \mathrm{~V}, V^{-}=-3.3 \mathrm{~V}\), and \(I_{Q}=0.4 \mathrm{~mA}\). The transistor parameters are \(\beta=120, V_{A
Design a differential amplifier with the configuration shown in Figure 11.28 incorporating a basic two-transistor current source to establish \(I_{Q}\). The bias voltages are to be \(V^{+}=+5
The differential amplifier shown in Figure P11.60 has a pair of pnp bipolars as input devices and a pair of npn bipolars connected as an active load. The circuit bias is \(I_{Q}=0.2 \mathrm{~mA}\),
The bias voltages for the diff-amp shown in Figure 11.30 are \(V^{+}=5 \mathrm{~V}\) and \(V^{-}=-5 \mathrm{~V}\). A load resistance of \(R_{L}=250 \mathrm{k} \Omega\) is capacitively coupled to the
Consider the diff-amp shown in Figure P11.62. The circuit parameters are \(V^{+}=3 \mathrm{~V}, V^{-}=-3 \mathrm{~V}\), and \(I_{Q}=0.4 \mathrm{~mA}\). The npn transistor parameters are
Consider the MOSFET diff-amp shown in Figure P11.63. The bias voltages are \(V^{+}=3 \mathrm{~V}\) and \(V^{-}=-3 \mathrm{~V}\). The current source is \(I_{Q}=200 \mu \mathrm{A}\) and has an output
The differential amplifier in Figure P11.64 has a pair of PMOS transistors as input devices and a pair of NMOS transistors connected as an active load. The circuit is biased with \(I_{Q}=0.2
The circuit parameters for the diff-amp shown in Figure 11.32 are \(V^{+}=1.8 \mathrm{~V}, V^{-}=-1.8 \mathrm{~V}\), and \(I_{Q}=120 \mu \mathrm{A}\). The NMOS transistor parameters are \(V_{T N}=0.3
Consider the diff-amp with active load in Figure P11.66. The Early voltages are \(V_{A N}=120 \mathrm{~V}\) for \(Q_{1}\) and \(Q_{2}\) and \(V_{A P}=80 \mathrm{~V}\) for \(Q_{3}\) and \(Q_{4}\). (a)
The diff-amp in Figure P11.67 has a three-transistor active load circuit and a Darlington pair configuration connected to the output. Determine the bias current \(I_{Q 1}\) in terms of \(I_{Q}\) such
Consider the diff-amp in Figure P11.68. The PMOS parameters are: \(K_{p}=\) \(80 \mu \mathrm{A} / \mathrm{V}^{2}, \lambda_{p}=0.02 \mathrm{~V}^{-1}, V_{T P}=-2 \mathrm{~V}\). The NMOS parameters are:
Reconsider the circuit in Figure P11.60 except that \(1 \mathrm{k} \Omega\) resistors are inserted at the emitters of the active load transistors \(Q_{3}\) and \(Q_{4}\) as in the circuit in Figure
Consider the circuit in Figure P11.70, in which the input transistors to the diff-amp are Darlington pairs. Assume transistor parameters of \(\beta(\mathrm{npn})=120, \beta(\mathrm{pnp})=80,
Design a BJT diff-amp with an active load similar to the configuration in Figure P11.70 except that the input devices are to be pnp transistors and the active load will have npn transistors. Using
Reconsider the diff-amp specifications listed in Problem 11.45. Design an all-CMOS diff-amp with the configuration in Figure 11.32 to meet the specifications. The NMOS transistor parameters are
An all-CMOS diff-amp, including the current source circuit, with the configuration in Figure 11.32 is to be designed to have a differential-mode gain of \(A_{d}=240\). The bias voltages are \(V^{+}=3
The differential amplifier with the configuration shown in Figure 11.36 is to be designed to achieve a differential-mode voltage gain of \(A_{d}=400\). The circuit parameters are to be \(V^{+}=+5
Consider the fully cascoded diff-amp in Figure 11.37. Assume \(I_{Q}=80 \mu \mathrm{A}\) and transistor parameters of: \(V_{T N}=0.8 \mathrm{~V}, k_{n}^{\prime}=60 \mu \mathrm{A} / \mathrm{V}^{2}\),
Consider the diff-amp that was shown in Figure P11.63. The circuit and transistor parameters are \(V^{+}=2.8 \mathrm{~V}, V^{-}=-2.8 \mathrm{~V}, I_{Q}=120 \mu \mathrm{A}\), \(K_{n}=K_{p}=0.2
The diff-amp in Figure P11.63 is biased at \(I_{Q}=0.5 \mathrm{~mA}\). The transistor parameters are \(K_{n}=K_{p}=0.25 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=0.4 \mathrm{~V}, V_{T P}=-0.4
The circuit and transistor parameters of the bipolar diff-amp shown in Figure P11.78 are \(I_{Q}=200 \mu \mathrm{A}, \beta_{\text {npn }}=125, \beta_{\text {pnp }}=80, V_{B E}(\) on \()=\) \(V_{E
Repeat Problem 11.78 if \(I_{Q}=120 \mu \mathrm{A}, V_{A N}=75 \mathrm{~V}\), and \(V_{A P}=40 \mathrm{~V}\). All other parameters remain the same.Data From Problem 11.78:-The circuit and transistor
(a) The Darlington pair circuit in Figure 11.45 has new bias current levels of \(I_{\text {BIAS } 1}=0.25 \mathrm{~mA}\) and \(I_{\text {BIAS } 2}=0.50 \mathrm{~mA}\). The transistor parameters are
Consider the BiCMOS diff-amp in Figure 11.44, biased at \(I_{Q}=0.4 \mathrm{~mA}\). The transistor parameters for \(M_{1}\) and \(M_{2}\) are: \(K_{n}=0.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=1\)
The BiCMOS circuit shown in Figure P11.82 is equivalent to a pnp bipolar transistor with an infinite input impedance. The bias current is \(I_{Q}=0.5 \mathrm{~mA}\). The MOS transistor parameters are
The bias current in the BiCMOS circuit shown in Figure P11.82 is \(I_{Q}=0.8 \mathrm{~mA}\). The transistor parameters are the same as described in Problem 11.82. (a) Sketch the small-signal
The bias current \(I_{Q}\) is \(25 \mu \mathrm{A}\) in each circuit in Figure P11.84. The BJT parameters are \(\beta=100\) and \(V_{A}=50 \mathrm{~V}\), and the MOSFET parameters are \(V_{T N}=0.8
For the circuit shown in Figure P11.85, determine the small-signal voltage gain, \(A_{v}=v_{o} / v_{i}\). Assume transistor parameters of \(V_{T N}=1 \mathrm{~V}, K_{n}=\) \(0.2 \mathrm{~mA} /
The output stage in the circuit shown in Figure P11.86 is a Darlington pair emitter-follower configuration. Assume \(\beta=120\) for all npn transistors and \(\beta=90\) for all pnp transistors. Let
For the circuit in Figure P11.87, the transistor parameters are \(\beta=100\) and \(V_{A}=\infty\). The bias currents in the transistors are indicated on the figure. Determine the input resistance
Consider the circuit in Figure P11.88. The bias currents \(I_{1}\) and \(I_{2}\) are such that a zero dc output voltage is established. The transistor parameters are: \(K_{p}=0.2 \mathrm{~mA} /
The bias currents in the circuit shown in Figure P11.89 are \(I_{1}=0.25 \mathrm{~mA}\) and \(I_{2}=1.0 \mathrm{~mA}\). The transistor parameters are \(K_{n}=0.5 \mathrm{~mA} / \mathrm{V}^{2}\),
Consider the multistage bipolar circuit in Figure P11.90, in which dc base currents are negligible. Assume the transistor parameters are \(\beta=120\), \(V_{B E}\) (on) \(=0.7 \mathrm{~V}\), and
The circuit in Figure P11.91 has two bipolar differential amplifiers in cascade, biased with ideal current sources \(I_{Q 1}\) and \(I_{Q 2}\). Assume the transistor parameters are \(\beta=180\) and
The transistor parameters for the circuit in Figure P11.92 are: \(\beta=200\), \(V_{B E}(\mathrm{on})=0.7 \mathrm{~V}\), and \(V_{A}=80 \mathrm{~V}\). (a) Determine the differential-mode voltage gain
For the transistors in the circuit in Figure P11.93, the parameters are: \(K_{n}=0.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=2 \mathrm{~V}\), and \(\lambda=0.02 \mathrm{~V}^{-1}\). (a) Determine the
Consider the differential amplifier in Figure 11.50(a) with parameters \(I_{Q}=0.8 \mathrm{~mA}, R_{C}=10 \mathrm{k} \Omega\), and \(R_{B}=0.5 \mathrm{k} \Omega\). The transistor parameters are
The differential amplifier in Figure 11.51 (a) has the same circuit and transistor parameters as described in Problem 11.94. The equivalent impedance of the current source is \(R_{o}=10 \mathrm{M}
A BJT diff-amp is biased with a current source \(I_{Q}=2 \mathrm{~mA}\), and the circuit parameters are \(R_{C}=10 \mathrm{k} \Omega\) and \(R_{B}=1 \mathrm{k} \Omega\). The transistor parameters
Consider the diff-amp in Figure 11.55. The circuit and transistor parameters are the same as in Problem 11.6. For a one-sided output at \(v_{o 2}\), determine the differential-mode gain for: (a)
Using a computer simulation, verify the results of Example 11.12.Data From Example 11.12:-Data From Example 11.11:-Data From Example 11.4:-Figure 11.32:-Figure 11.36:- Calculate the differential-mode
Using a computer simulation, verify the results of Example 11.13 for the simple op-amp circuit.Data From Example 11.13:- Calculate the input resistance and the small-signal voltage gain of a
Consider the circuit in Figure P11.100. Use standard transistors. Using a computer simulation, determine the small-signal differential-mode voltage gain and common-mode voltage gain for (a)
Consider the circuit in Figure P11.101. Use standard transistors. Using a computer simulation, determine the small-signal differential-mode voltage gain and common-mode voltage gain for (a)
Design a basic BJT diff-amp with an active load and constant currentsource biasing. The bias voltages are to be \(\pm 3 \mathrm{~V}\) and the maximum power dissipation is to be limited to \(2
Design a basic MOSFET diff-amp with an active load and constant current-source biasing. The bias voltages are to be \(\pm 3 \mathrm{~V}\) and the maximum power dissipation is to be limited to \(2
Consider the bipolar op-amp configuration in Figure 11.49. The bias voltages are \(\pm 10 \mathrm{~V}\), as shown, the current \(I_{R 7}\) is to be \(I_{R 7}=3 \mathrm{~mA}\), and the maximum dc
The transistor parameters for the circuit in Figure P11.105 are: \(K_{n}=\) \(0.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=0.8 \mathrm{~V}\), and \(\lambda=0\). The output resistance of the
What are the two general types of feedback and what are the advantages and disadvantages of each type?
Write the ideal form of the general feedback transfer function.
Define the loop gain factor.
What is the difference between open-loop gain and closed-loop gain?
Describe what is meant by the terms (a) gain sensitivity and (b) bandwidth extension.
Describe the series and shunt input connections of a feedback amplifier.
Describe the series and shunt output connections of a feedback amplifier.
Describe the effect of a series or shunt input connection on the value of input resistance.
Describe the effect of a series or shunt output connection on the value of output resistance.
Consider a noninverting op-amp circuit. Describe the type of input and output feedback connections.
Consider an inverting op-amp circuit. Describe the type of input and output feedback connections.
What is the Nyquist stability criterion for a feedback amplifier?
Using Bode plots, describe the conditions of stability and instability in a feedback amplifier.
What is meant by frequency compensation?
What is a dominant pole?
What is a common technique of frequency compensation in a feedback amplifier?
Sketch the basic BJT two-transistor current source and explain the operation.
Explain the significance of the output resistance of the current-source circuit.
Discuss the effect of mismatched transistors on the characteristics of the BJT two-transistor current source.
Sketch the BJT three-transistor current source and discuss the advantages of this circuit.
What is the primary advantage of a BJT cascode current source?
Sketch a Widlar current source and explain the operation.
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