Methods and apparatus for dynamic offset adjustment in a...

Details Methods and apparatus for dynamic offset adjustment in a... Methods and apparatus for dynamic offset adjustment in a...

2006-11-21

2006-11-21

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

07138793

ABSTRACT:
Apparatus and methods for detecting passing magnetic articles including an offset adjustment circuit for adjusting the DC level of the magnetic field signal based on a dynamically adjustable offset threshold signal. The detector includes a PDAC for tracking the positive peaks of a magnetic field signal and an NDAC for tracking the negative peaks of the magnetic field signal. In one embodiment, the offset threshold signal includes a positive offset threshold signal and a negative offset threshold signal that are initially set at fixed respective signal levels and that become the level of the PDAC signal and NDAC signals, respectively, in response to a counter, that counts a number of increments of the PDAC signal and decrements of the NDAC signal, reaching a predetermined count value.

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Datasheet, ATS6421LSH, “Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor with Continuous Calibration”, Allegro Microsystems, Inc., 16 pages.
Voisine, Cory, et al., U.S. Appl. No. 11/333,522 filed Jan. 17, 2000.

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