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Sensor Circuitfor Measuring a Physical Quantity

 
: Nikas, Antonios; Leman, Olivier; Hauer, Johann

:
Frontpage ()

EP 20130195129 : 20131129
English
Patent, Electronic Publication
Fraunhofer IIS ()

Abstract
Proposed is a sensor circuit for measuring a physical quantity, wherein the sensor circuit comprises at least one sensing composition comprising a variable resistor having a resistance depending on the physical quantity; a first amplifier arrangement for outputting an output signal based on the resistance of the variable resistor, wherein the first amplifier arrangement comprises one field-effect transistor or a plurality of field-effect transistors in a telescopic cascode configuration or a plurality of field-effect transistors in a folded cascode configuration, wherein the first amplifier arrangement comprises an outer source terminal and an outer drain terminal, wherein a first terminal of the variable resistor is connected to the outer source terminal, such that the field-effect transistor having the outer source terminal and the variable resistor form a series circuit; a feedback arrangement for feedbacking at least a part of the output signal of the first amplifier arrangement, which is obtained at the outer drain terminal, to at least one gate terminal of the field-effect transistors of the amplifier arrangement, wherein the feedback arrangement comprises at least one passive or active electronic component, which connects the outer drain terminal to the gate terminal of the field-effect transistor having the outer source terminal; and a first current source for biasing the series circuit of the field-effect transistor having the outer source terminal and the variable resistor.

: http://publica.fraunhofer.de/documents/N-356546.html