Analogue Electronic Circuits and Systems 1st. Edition by Amitava Basak | 9780521369138 | 0521369134 | Holooly

Electronic Devices and Circuits

Analogue Electronic Circuits and Systems

74 SOLVED PROBLEMS

Question: 8.4

Develop a macromodel for the operational amplifier LM118 using the data given in Table ex.8.4. ...

Verified Answer:

Let us consider the model shown in Fig. 8.14. Coll...

Question: 8.5

In order to determine the d.c. conditions of the circuit of Fig. ex.8.5(a) obtain a set of general equations in matrix form which can be solved using the Newton-Raphson algorithm. Compute the d.c. voltages at the nodes of the circuit if the transistor is in forward active region. The saturation ...

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After replacing the transistor by Ebers-Moll model...

Question: 8.3

Find the variations in current and voltage gains and also the input admittance of the amplifier circuit shown in Fig. ex.8.3 with frequency. The Ebers-Moll model of the transistor BCY70 is available as the prime model. ...

Verified Answer:

AUDIO AMPLIFIER. BASAK. Rl 1273 0 2 ; R2 2.573 2 0...

Question: 7.16

In order to analyse a complex waveform the data acquisition system shown in Fig. ex.7.16 is used. The error sources and average errors in percentage are given in Table 7.1. The systematic errors due to temperature change and power supply variation can be neglected. Assuming that the random errors ...

Verified Answer:

Add the average errors algebraically.

0.005...

Question: 7.15

The sample-and-hold circuit in Fig. ex.7.15 has the following data: C = 0.1 μF, maximum output current of the operational amplifiers = 100 mA, amplifier bias currents = 10 nA. It is used in a 10 V, 10-bit system. Calculate the acquisition time and the droop rate. If the sampleand- hold circuit is ...

Verified Answer:

From (7.19)

d V^{+} _{c} /dt= (I_{max}- I_{...

Question: 7.14

The circuit in Fig. ex.7.14 is connected to a source with an output impedance of 600 Ω. The ‘on’ resistance of the FET switch is 250 Ω. The bias current of the operational amplifier is 50 pA. Find the acquisition time to 1 % for a 10 V change in the output if the value of the capacitor is 0.01 μF ...

Verified Answer:

R=R_{s} +r_{on}

t_{ac...

Question: 7.13

Sixteen 16-channel multiplexers are used in a data acquisition system as shown in Fig. ex.7.13(a). The ‘on’ resistance of the switch is 270 Ω the capacitance across the open switch is 1 pF and the output capacitance of each multiplexer is 50 pF. To achieve an accuracy of 0.1% what would be ...

Verified Answer:

The delay time is given by

t_{d}= t_{A} -t_...

Question: 7.11

A multiplexer is part of a 12-bit, 10-volt system. The CMOSFET switches have leakage currents of 45 nA and ‘on’ resistances of 450 Ω. The multiplexer output capacitance is 44 pF. All inputs are scanned sequentially, (i) Calculate the number of input channels that the multiplexer has if the maximum ...

Verified Answer:

\frac{1}{8} LSB = \frac{1}{8} \times \fra...

Question: 7.12

In a data acquisition system 64 signals are scanned sequentially and are connected to an analogue-to-digital converter via nine multiplexers as shown in Fig. ex.7.12(a). Each one has eight input channels. The leakage current is 10 nA when a switch is at ‘off’ state. The ‘on’ resistance of the switch ...

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At any particular moment only one channel of the m...

Question: 6.1

An amplitude modulated waveform has a carrier frequency of 71.867 kHz and an upper sideband which extends from 72.2 kHz to 75 kHz. What is the frequency range of the lower sideband? If the modulated waveform has to be amplified what would be the bandwidth of the amplifier? ...

Verified Answer:

\begin{array}{r c}\begin{matrix} f_c+& ...

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