Patent ID: 6066966
Filing Date: 2000-05-23
Classification: H03K

Abstract:
A control circuit for use in a Hall-effect switching device, which comprises:a current-latching circuit having a first input port and a second input port, generating a latching current in response to a pair of input signals received respectively via the first and second input ports from the switching device wherein said current-latching circuit includes a pair of symmetrically arranged BJTs, with one BJT being connected in such a manner that its collector is connected to the first input port, its emitter is connected to a current source, and its base is connected to the second input port and the other BJT being connected in such a manner that its collector is connected to the second input port, its emitter is connected to the current source, and its base is connected to the first input port;a hystersis double-output circuit having a first output port and a second output port, generating a pair of complementary output signals at the first and second output ports in response to the latching current from the current-latching circuit; anda Hall-effect sensitivity adjusting circuit which is the current source and varies the hystersis effect caused by the hystersis double-output circuit to thereby adjust the Hall-effect sensitivity of the switching device.