Sensor and sigma-delta converter
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United States of America Patent
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-
May 3, 2005
Grant Date -
May 15, 2003
app pub date -
Feb 16, 2001
filing date -
Feb 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sensor for determining at least one parameter with a sigma-delta converter (1) comprises switched input capacitors and feedback capacitors (Cf1, Cf2, Crefc1, Crefc2, Creff1, Creff2, Crt1, Crt2, Cr1, Cr2, Ctemp1, Ctemp2, Cs1, Cs2). At least one of the capacitors is designed such that its capacitance depends on the parameter to be determined. In this way, the change of capacitance can be directly determined by means of the sigma-delta converter. Due to a symmetric design of the converter a higher accuracy can be reached.
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