Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-06-20
2006-06-20
Ledynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S207210, C324S207200, C327S510000
Reexamination Certificate
active
07064538
ABSTRACT:
A system and methods for an interface for magnetic sensors to determine a rotational angle has been achieved. This interface can be used for magnetic sensors providing analog signals of the sine and cosine values of the angle to be determined. Analog signals are being processed in two measurement paths for the sine and cosine signal each until the desired angle is computed by a CORDIC processor. The first stage of the measurement path is the conversion of the sine and cosine signals from analog to digital by2ndorder delta-sigma modulators with an over-sampling ratio. A low-pass decimation filter with sinc3characteristic performs the digital value computation. The next stage normalizes the digitized sine and cosine values to correct offset and scaling deviations. The CORDIC processor computes the angle by decomposing the desired rotation angle into iterations of pre-defined elementary rotation angles performing the rotation operation by simple shift-and-add operations and the magnitude of the vector using the output from the normalization stages.
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Logue, Aaron, ISA Interface Card-A Starting Point for Numerous Projects, Internet Publication, Oct., 1999, full document.
Ackerman Stephen B.
Dialog Semiconductor GmbH
Ledynh Bot
Saile George O.
Whittington Kenneth J.
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