Patent ID: 8957676
Filing Date: 2015-02-17
Classification: G01R,H03K

Abstract:
1. An integrated magnetic field sensor, comprising: a magnetic field sensing element configured to generate a magnetic field sensing element output signal in response to a magnetic field; a comparator having a first input node coupled to receive a first signal representative of the magnetic field sensing element output signal, a second input node coupled to receive a second signal representative of an adjustable threshold signal, and an output node at which is generated an output signal responsive to the first and second signals; a threshold control node configured to receive a control signal from outside of the integrated magnetic field sensor; and a threshold generation circuit coupled between the threshold control node and the second input node of the comparator, wherein the threshold generation circuit comprises an oscillator coupled to the threshold control node, wherein the control signal comprises a AC voltage signal appearing at the threshold control node and having a magnitude related to a value of a capacitor coupled to the threshold control node and disposed outside of the integrated magnetic field sensor, wherein the threshold generation circuit is coupled to receive the control signal and configured to generate the adjustable threshold signal.