Spinning current hall sensor with residual offset calibration signal

摘要

A spinning current Hall sensor configured to provide a sequence of input signals in response to a bias current being applied to a sequence of terminals of Hall sensing elements of the Hall sensor, the terminals of the Halls sensing elements configured to be interconnected in a sequence of configurations between a bias current supply and ground, with the bias current supply being connected to and applying the bias current to a different one of the terminals of each configuration. A chopping circuit demodulates the sequence of input signals to provide a corresponding sequence of demodulated positive and negative signals, with a residual offset calibration signal for the spinning current Hall sensor being based on the sequence of demodulated positive and negative signals.

主权项

1. A system comprising:
a bias current supply configured to provide a bias current; a spinning current Hall sensor configured to provide, in a residual offset adjustment mode, a sequence of input signals in response to the bias current being applied to a sequence of terminals of Hall sensing elements of the Hall sensor in a spin direction, the terminals of the Hall sensing elements of the Hall sensor configured to be interconnected in a sequence of configurations between the bias current supply and ground, with the bias current supply being connected to and applying the bias current to a different one of the terminals of each configuration, wherein a spin direction comprises a sequence of terminals of the Hall sensing elements to which the bias current is applied; and a chopping circuit configured to receive and demodulate the sequence of input signals and to provide a corresponding sequence of demodulated positive and negative signals; and, wherein a residual offset calibration signal for the spinning current Hall sensor is determined based on the sequence of demodulated positive and negative signals.