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  • universal transducer interface  (1)
  • voltage processor  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A Cmos Interface for Thermocouples with Reference-Junction Compensation (1997)
    Springer
    Analog integrated circuits and signal processing 14 (1997), S. 235-248 
    Details
    ISSN: 1573-1979
    Keywords: thermocouple interface ; voltage processor ; dynamic voltage reference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents a CMOS interface for a thermocouple, includingreference-junction compensation. The interface contains a first-orderoscillator whose period is modulated by the signal from the thermocouple(VX) and two other signals generated internally. One is abase-emitter voltage (VBE) and the other is a PTAT voltage(VPTAT). Linear combinations of the periods corresponding tothese two voltages are made by a µC, to obtain a reference signal anda temperature-dependent signal. The internal signals are required to provideauto-calibration for offset and gain and to measure the interface internaltemperature. Dynamic Element Matching is applied to generate an accurate andreliable PTAT voltage. The inaccuracy in the base-emitter voltage iscalibrated using a vertical PNP substrate transistor with multi-emitterareas. The applied modulator used in the circuit has a second-orderfiltering which suppresses low-frequency (1/f) noise. This filteringproperty enables the use of a low-cost CMOS process for the implementationof the circuit. The interface is able to measure a voltage(VX) in the range of −27 mV to 100 mV, the measuredaccuracy of the system over a temperature range of −25°C to75°C is 550 ppm of VX ± 2µV. The inaccuracyin determining the reference-junction temperature is 0.6 K. The measuringtime is ≤50 ms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008294019845
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Universal Transducer Interface for Capacitive and Resistive Sensor Elements (1997)
    Springer
    Analog integrated circuits and signal processing 14 (1997), S. 249-260 
    Details
    ISSN: 1573-1979
    Keywords: transducer interface ; smart sensor system ; smart sensor interface ; bridge interface ; captive interface ; universal transducer interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper presents a new universal transducer interface.This interface, which is read out by a microcontroller, servicesthe following sensor elements: capacitors, platinum resistors,thermistors, resistive bridges and potentiometers. The A/D conversionis based on a first-order oscillator. A combination of classicaland some new measurement techniques has been applied on a singlechip to obtain high accuracy, good long-term stability and areduction of the effects of interference and parasitic elements.The circuit has been fabricated in a 0.7 µm CMOSprocess. The main test results are: an accuracy of 10–15bits and a resolution up to 16 bits while the measurement timeis in the range 1–100ms. These results hold over the temperaturerange −20°C to 80°C. Calibrationof the electronic part is not required. The number of externalcomponents has been kept to a minimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008246103915
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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