EEE 432 Measurement and Instrumentation -...
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1 EEE 432 Measurement and Instrumentation Lecture 7 Analog Signal processing Prof. Dr. Murat Aşkar İzmir University of Economics Dept. of Electrical and Electronics Engineering 2 Signal processing Signal processing is concerned with improving the quality of the reading or signal at the output of a measurement system, and one particular aim is to attenuate any noise in the measurement signal that has not been eliminated by careful design of the measurement system Analog signal processing Digital signal processing
Transcript of EEE 432 Measurement and Instrumentation -...
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EEE 432
Measurement and Instrumentation
Lecture 7
Analog Signal processing
Prof. Dr. Murat Aşkarİzmir University of EconomicsDept. of Electrical and Electronics Engineering
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Signal processing
Signal processing is concerned with improving the quality of
the reading or signal at the output of a measurement system,
and one particular aim is to attenuate any noise in the
measurement signal that has not been eliminated by careful
design of the measurement system
Analog signal processing
Digital signal processing
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Signal processingAnalog Signal Processing
Filters
– Passive
– Active
Signal amplification
Signal attenuation
Differential amplification
Signal linearization
Bias (zero drift) removal
Signal Integration
Signal Differentiation
Voltage follower (pre-amplifier)
Voltage comparator
Voltage-to-current converter
Current to-voltage converter
Phase-sensitive detector
Lock-in amplifier
Signal addition
Signal multiplication
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Signal processingDigital signal processing
Sample and hold circuit
Analog-to-digital (A/D) conversion
Digital-to-analog (D/A) conversion
Digital filtering
Autocorrelation
Other digital signal processing operations
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Signal processingFilters
Filter : a circuit that is designed to pass signals with desired frequencies and reject or attenuate others
4 types of filters:
1. Low-pass filter: passes low frequencies and stops high frequencies
2. High-pass filter: passes high frequencies and rejects low frequencies
3. Band-pass filter: passes frequencies within a frequency band and blocks or attenuates frequencies outside the band
4. Band-reject filter: passes frequencies outside a frequency band and blocks or attenuates frequencies within the band
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FiltersLow Pass Filter
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FiltersHigh Pass Filter
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FiltersBand Pass Filter
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FiltersBand Reject Filter
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FiltersPassive Filters
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FiltersActive Filters
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Analog Signal ProcessingSignal Amplification
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Analog Signal ProcessingSignal Attenuation
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Analog Signal ProcessingDifferential Amplification
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Analog Signal ProcessingSignal Linearization
Light intensity transducers typically have an exponential
relationship between the output signal and the input light
intensity, i.e.: VI = Ke-aQ
where Q is the light intensity, VI is the voltage level of the
output signal, and K and a are constants.
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Analog Signal ProcessingBias Removal
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Analog Signal ProcessingSignal Integration
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Analog Signal ProcessingSignal Differentiation
dt
dVRCV
R
V
dt
dVC
inout
outin
0
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Analog Signal ProcessingVoltage Comparator
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Analog Signal ProcessingVoltage-to-Current Converter
543
354
42531
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RRR
RI
VRR
R
RRRRR
VRR
RI
m
sat
ml
in
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Analog Signal ProcessingCurrent-to-Voltage Converter
IRVout
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Signal processingAnalog Signal Processing
Filters
– Passive
– Active
Signal amplification
Signal attenuation
Differential amplification
Signal linearization
Bias (zero drift) removal
Signal Integration
Signal Differentiation
Voltage follower (pre-amplifier)
Voltage comparator
Voltage-to-current converter
Current to-voltage converter
Phase-sensitive detector
Lock-in amplifier
Signal addition
Signal multiplication
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Signal processingDigital signal processing
Sample and hold circuit
Analog-to-digital (A/D) conversion
Digital-to-analog (D/A) conversion
Digital filtering
Autocorrelation
Other digital signal processing operations
