Microelectronics Circuit Analysis and Design 4th. Edition by Donald Neamen | 9780073380643 | 0073380644 | Holooly

Circuit Analysis

Microelectronics Circuit Analysis and Design

279 SOLVED PROBLEMS

Question: 5.16

Objective: Design a bias-stable circuit to meet a set of specifications. Specifications: The circuit configuration to be designed is shown in Figure 5.54(a). Let VCC = 5 V and RC = 1 k. Choose RE and determine the bias resistors R1 and R2 such that the circuit is considered bias stable and that VC ...

Verified Answer:

With

β = 120, I_{C Q} \approx I_{E Q}[/late...

Question: 1.13

Objective: Consider a simple constant-voltage reference circuit and design the value of resistance required to limit the current in this circuit. Consider the circuit shown in Figure 1.45. Assume that the Zener diode breakdown voltage is VZ = 5.6 V and the Zener resistance is rz = 0. The current ...

Verified Answer:

As before, we can determine the current from the v...

Question: 9.12

Objective: Design an amplifier system that will produce an output voltage of ±5 V when the resistance R3 deviates by ±1% from the value of R2. This would occur, for example, in a system where R3 is a thermistor whose resistance is given by R3 = 200 [1 + (0.040)(T − 300)/300] kΩ where T is the ...

Verified Answer:

With

R_{1} = R_{2}

, from Equation (...

Question: 9.11

Objective: Design a voltage reference source with an output of 10.0 V. Use a Zener diode with a breakdown voltage of 5.6 V. Assume the voltage regulation will be within specifications if the Zener diode is biased between 1–1.2 mA. ...

Verified Answer:

Consider the circuit shown in Figure 9.42. For thi...

Question: 15.8

Objective: Design a Schmitt trigger oscillator for a speciﬁed frequency. Speciﬁcations: Assume that an ideal comparator is available. Use standard-valued resistors and capacitors in the ﬁnal desig Consider the oscillator in Figure 15.35. Design the circuit to oscillate at fo = 1 kHz ...

Verified Answer:

Using Equation (15.88), we can write

f = \f...

Question: 12.12

Objective: Design a driver amplifier to supply current to an LED. Specifications: The available voltage source is variable from 0 to 5 V and has an output resistance of 200 Ω. The required diode current is 10 mA when the maximum input voltage is applied. The required closed-loop transconductance ...

Verified Answer:

(Design Approach): To minimize loading effects on ...

Question: 10.8

Objective: Design a MOSFET current source circuit to meet a set of specifications. Specifications: The circuit to be designed has the configuration shown in Figure 10.17. The bias voltages are V^+ = 2.5 V and V^− = 0. Transistors are available with parameters k´n = 100 µA/V² , VT N = 0.4 V, and ...

Verified Answer:

We have

V_{DS2}(sat) = 0.4 = V_{GS2} − 0....

Question: 12.10

Objective: Design a feedback amplifier to provide a given current gain. Specifications: Assume that a signal current source has a nominal output resistance of RS = 10 kΩ and that the amplifier will drive a nominal load of RL = 50 Ω. A current gain of 10 is required. Choices: An op-amp with the same ...

Verified Answer:

(Design Approach): An amplifier with a low input r...

Question: 12.8

Objective: Design a feedback amplifier to amplify the output signal of a microphone to meet a set of specifications. Specifications: The output signal from the microphone is 10 mV and the output signal from the feedback amplifier is to be 0.5 V in order to drive a power amplifier that in turn will ...

Verified Answer:

(Design Approach): Since the source resistance is ...

Question: 15.1

Objective: Design a two-pole low-pass Butterworth filter for an audio amplifier application. Specifications: The circuit with the configuration shown in Figure 15.7(a) is to be designed such that the bandwidth is 20 kHz. Choices: An ideal op-amp is available and standard-valued resistors and ...

Verified Answer:

From Equation (15.19), we have

ω_{3 dB} = ...

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