Hall effect circuit with temperature compensation

摘要

A temperature compensation method and circuit for a Hall element or other element with similar characteristics comprising a pair of current carrying branches, one of which includes a resistor. A pair of transistors in the branches are controlled in unison to control the sum of the currents in the branches in response to current through the element, and controlled differentially to control the relative magnitudes of the currents in the branches in response to the voltage generated by the element. A comparator circuit including an active load in the branches compares the branch currents and provides a switched output signal upon a predetermined relationship between the currents. Switching hysteresis is provided by changing the sum of the currents depending on the state of the output signal.