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- Silicon_bandgap_temperature_sensor abstract "The silicon bandgap temperature sensor is an extremely common form of temperature sensor (thermometer) used in electronic equipment. Its main advantage is that it can be included in a silicon integrated circuit at very low cost. The principle of the sensor is that the forward voltage of a silicon diode, which may be the base-emitter junction of a bipolar junction transistor (BJT), is temperature-dependent, according to the following equation:whereT = temperature in kelvinT0 = reference temperatureVG0 = bandgap voltage at absolute zeroVBE0 = bandgap voltage at temperature T0 and current IC0K = Boltzmann's constantq = charge on an electronn = a device-dependent constantBy comparing the bandgap voltages of two junctions at the same temperature, but at two different currents, IC1 and IC2, many of the variables in the above equation can be eliminated, resulting in the relationship:Note that the junction voltage is a function of current density, i.e. current/junction area, and a similar output voltage can be obtained by operating the two junctions at the same current, if one is of a different area to the other.A circuit that forces IC1 and IC2 to have a fixed N:1 ratio,gives the relationship:An electronic circuit, such as the Brokaw bandgap reference, that measures ΔVBE can therefore be used to calculate the temperature of the diode. The result remains valid up to about 200 °C to 250 °C, when leakage currents become large enough to corrupt the measurement. Above these temperatures, materials such as silicon carbide can be used instead of silicon.The voltage difference between two p-n junctions (e.g. diodes), operated at different current densities, is proportional to absolute temperature (PTAT).PTAT circuits using either BJT or CMOS transistors are widely used in temperature sensors (where we want the output to vary with temperature), and also in bandgap voltage references and other temperature-compensating circuits (where we want the same output at every temperature).If high precision is not required it is enough to bias a diode with any constant low current and use its −2 mV/˚C thermal coefficient for temperature calculation, however this requires calibration for each diode type. This method is common in monolithic temperature sensors.[citation required]".
- Silicon_bandgap_temperature_sensor thumbnail Bandgap-reference.svg?width=300.
- Silicon_bandgap_temperature_sensor wikiPageExternalLink AN_892.pdf.
- Silicon_bandgap_temperature_sensor wikiPageExternalLink AN-460.pdf.
- Silicon_bandgap_temperature_sensor wikiPageID "242279".
- Silicon_bandgap_temperature_sensor wikiPageRevisionID "596177096".
- Silicon_bandgap_temperature_sensor hasPhotoCollection Silicon_bandgap_temperature_sensor.
- Silicon_bandgap_temperature_sensor subject Category:Thermometers.
- Silicon_bandgap_temperature_sensor type Artifact100021939.
- Silicon_bandgap_temperature_sensor type Device103183080.
- Silicon_bandgap_temperature_sensor type Instrument103574816.
- Silicon_bandgap_temperature_sensor type Instrumentality103575240.
- Silicon_bandgap_temperature_sensor type MeasuringInstrument103733925.
- Silicon_bandgap_temperature_sensor type Object100002684.
- Silicon_bandgap_temperature_sensor type PhysicalEntity100001930.
- Silicon_bandgap_temperature_sensor type Thermometer104421872.
- Silicon_bandgap_temperature_sensor type Thermometers.
- Silicon_bandgap_temperature_sensor type Whole100003553.
- Silicon_bandgap_temperature_sensor comment "The silicon bandgap temperature sensor is an extremely common form of temperature sensor (thermometer) used in electronic equipment. Its main advantage is that it can be included in a silicon integrated circuit at very low cost.".
- Silicon_bandgap_temperature_sensor label "Silicon bandgap temperature sensor".
- Silicon_bandgap_temperature_sensor sameAs m.01k4ww.
- Silicon_bandgap_temperature_sensor sameAs Q7515014.
- Silicon_bandgap_temperature_sensor sameAs Q7515014.
- Silicon_bandgap_temperature_sensor sameAs Silicon_bandgap_temperature_sensor.
- Silicon_bandgap_temperature_sensor wasDerivedFrom Silicon_bandgap_temperature_sensor?oldid=596177096.
- Silicon_bandgap_temperature_sensor depiction Bandgap-reference.svg.
- Silicon_bandgap_temperature_sensor isPrimaryTopicOf Silicon_bandgap_temperature_sensor.