SIGNAL PROCESSING ARRANGEMENT FOR A HALL SENSOR AND SIGNAL PROCESSING METHOD FOR A HALL SENSOR

摘要

A signal processing arrangement for a Hall sensor comprises a signal path (1), a feedback path (3) and a converter path (5). The signal path (1) comprises a Hall element (11, 12) and a front-end amplifier (16) which are connected in series and arranged to generate an output signal (SOUT) depending on a magnetic field (B). The feedback path (3) comprises a compensation circuit and is coupled to the signal path (1). The converter path (5) comprises an analog-to-digital converter (51) and an offset compensation circuit and is coupled to the signal path (1). A switch network (21, 22, 23, 24) is coupled between the signal path (1), the feedback path (3) and the converter path (5). In a compensation phase (ΦCOMP), the switch network (21, 22, 23, 24) electrically connects the feedback path (3) to the signal path (1) such that the compensation circuit generates a compensation signal (SCOR) which is coupled into the signal path (1). In a sampling phase (ΦSAMP), the switch network (21, 22, 23, 24) connects the signal path (1) to the converter path (5) such that the output signal (SOUT) is reduced by the compensation signal (SCOR) is provided at the converter path (5).