Digital output semiconductor magnetic field sensor...

Details Digital output semiconductor magnetic field sensor... Digital output semiconductor magnetic field sensor...

2007-03-13

2010-11-02

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C324S252000

Reexamination Certificate

active

07825845

ABSTRACT:
A digital output semiconductor magnetic field sensor integrated circuit provides a low-cost and dense packaging solution for providing digital indicators of magnetic field magnitudes. A delta-sigma modulator based analog-to-digital converter (ADC) is integrated on a die with a semiconductor magnetic field sensor. The delta-sigma modulator provides for noise-shaping the sensor output and the co-location of the sensor and the converter on the die provides for improved noise immunity. The current loops of the ADC and digital interface are made as small as possible and are disposed on the die so that they are orthogonal to the axis of the magnetic field sensor, so that noise from the converter operation is isolated from the sensor.

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Pastre, et al., “A Hall Sensor Analog Front End for Current Measurement with Continuous Gain Calibration”, IEEE International Solid-State Circuits Conference 2005 Digest of Papers, IEEE Press, pp. 242-243.

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