semiconductor sensors
TRANSCRIPT
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A Sensor is a device that detects events or changes in quantities and provides
a corresponding output
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Operation with reverse bias
Capacitance should be
small
Leakage current should be low
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In form of IC’s
Thin silicon wafer
thousands of devices can be fabricated
Most popular are AD590 and LM35
Basic principle
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VOLTAGE OUTPUT TEMPERATURE SENSORS
Need a source of power supply
Effective linear output
Low output impedance
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CURRENT OUTPUT TEMPERATURE SENSORS
High output impedance
Need a input voltage source
Constant current regulators
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DIGITAL OUTPUT TEMPERATURE SENSORS
o Fabricated with analog to digital convertor on an IC chip
o Doesn’t provide a standard digital surfaces
o Cannot be employed with standard measuring devices
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RESISTANCE OUTPUT TEMPERATURE SENSORS
Typical semi conductor manufacturing equipment
Offers high tolerance to iron migration
Needs extra care
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DIODE TEMPERATURE SENSORS
Uses regular PN junction diode
Very cheap and very efficient
Provides temperature coefficient of around 2.3 mV/°C
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a. Absolute Pressure Sensor
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b. Differential Pressure Sensor
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c. Gauge Pressure Sensor d. Negative pressure sensor
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The possibilities of applications of the semiconductor sensors are endless.
Research is still going on, almost all the sensors employ the use of semiconductors,
thus called semiconductor sensors.
From a Remote control television to satellite sensing everything involves semiconductor
sensors
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