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period 100 s, with the leading edge of the rst pulse at t = 0 a Sketch Vout if the RC circuit has a time constant equal to 20 s b Sketch Vout if the RC circuit has a time constant equal to 1 ms
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1542 The unsigned decimal number 1210 is inputted to
Figure P1536
1537 Show that the expression for Q in the lter of
Problem 1535 is given by 1 = Q R2 R3 C2 C1 1 1 1 + + R1 R2 R3
a four-bit DAC Given that RF = R0 /15, logic 0 corresponds to 0 V, and logic 1 corresponds to 45 V, a What is the output of the DAC b What is the maximum voltage that can be outputted from the DAC c What is the resolution over the range 0 to 45 V d Find the number of bits required in the DAC if an improved resolution of 20 mV is desired to an eight-bit DAC Given that RF = R0 /255, logic 0 corresponds to 0 V, and logic 1 corresponds to 10 V, a What is the output of the DAC b What is the maximum voltage that can be outputted from the DAC c What is the resolution over the range 0 to 10 V d Find the number of bits required in the DAC if an improved resolution of 3 mV is desired
1543 The unsigned decimal number 21510 is inputted
Section 4: Data Acquisition Systems 1538 List two advantages of digital signal processing
over analog signal processing
1539 Discuss the role of a multiplexer in a data
acquisition system
1540 The circuit shown in Figure P1540 represents a
sample-and-hold circuit, such as might be used in a successive-approximation ADC Assume that the JFET is turned on when VG is high, and off when VG is low Explain the operation of the circuit
1544 The circuit shown in Figure P1544 represents a
simple 4-bit digital-to-analog converter Each switch is controlled by the corresponding bit of the digital number if the bit is 1 the switch is up; if the bit is 0 the switch is down Let the digital number be represented by b3 b2 b1 b0 Determine an expression relating vo to the binary input bits
V S3 R1
op-amp +# 1 RG
op-amp +# 2 C R
Vout
S2 Vin t VG t VG S1
4R1 R2
Figure P1540
1541 For the circuit shown in Figure P1540, let Vin be
a 1 kHz sinusoidal signal with 0 phase angle, 0 V DC offset, and 20 V peak-to-peak amplitude Let VG be a rectangular pulse train, with pulse width 10 s, and
Figure P1544
15
Electronic Instrumentation and Measurements
1545 The unsigned decimal number 9810 is inputted to
an eight-bit DAC Given that RF = R0 /255, logic 0 corresponds to 0 V and logic 1 corresponds to 45 V, a What is the output of the DAC b What is the maximum voltage that can be outputted from the DAC c What is the resolution over the range 0 to 45 V d Find the number of bits required in the DAC if an improved resolution of 05 mV is desired (using an ideal op-amp), what value of RF will give an output range of 10 V0 0 V Assume that logic 0 = 0 V and logic 1 = 5 V
1/8 k 1/4 k 1/2 k 1 k + V0 RF
a What is the output of the DAC b What is the maximum voltage that can be outputted from the DAC c What is the resolution over the range 0 to 10 V d Find the number of bits required in the DAC if an improved resolution of 05 mV is desired
1550 For the DAC circuit shown in Figure P1546
(using an ideal op-amp), what value of RF will give an output range of 15 V0 0 V
1546 For the DAC circuit shown in Figure P1546
1551 Using the model of Figure P1544, design a 4-bit
digital-to-analog converter whose output is given by vo = 1 (8b3 + 4b2 + 2b1 + b0 )V 10
QA QB QC QD
1552 A data acquisition system uses a DAC with a
range of 15 V and a resolution of 001 V How many bits must be present in the DAC range of 10 V and a resolution of 004 V How many bits must be present in the DAC range of 10 to +15 V and a resolution of 0004 V How many bits must be present in the DAC commands to a motor The maximum velocity is to be 2,500 rev/min, and the minimum nonzero velocity is to be 1 rev/min How many bits are required in the DAC What will the resolution be
1553 A data acquisition system uses a DAC with a
1554 A data acquisition system uses a DAC with a
Figure P1546
1547 Explain how to redesign the circuit of
Figure P1544 so that the overall circuit is a noninverting device
1555 A DAC is to be used to deliver velocity
1548 The circuit of Figure P1548 has been suggested
as a means of implementing the switches needed for the digital-to-analog converter of Figure P1544 Explain how the circuit works
1556 Assume the full-scale value of the analog input
voltage to a particular analog-to-digital converter is 10 V a If this is a 3-bit device, what is the resolution of the output b If this is an 8-bit device, what is its resolution c Make a general comment about the relationship between the number of bits and the resolution of an ADC
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