Patent ID: 6133768
Filing Date: 2000-10-17
Classification: H03K

Abstract:
In a write current driver circuit having a current driver semiconductor device having a control element arranged to be operated by a write driver current to supply a write current to an inductive load through a write current circuit path that includes a controlled element of the current driver semiconductor device, the improvement of a write current compensation circuit comprising:a simulation circuit having a simulation semiconductor device having a control element arranged to be operated by a current representative of the write driver current to supply a current to a simulation load through a simulation circuit path that simulates operation of the write current circuit path;a sense circuit connected to the control element of the simulation semiconductor device to supply a compensation current to an output of the sense circuit based on current in the control element of the simulation semiconductor device; anda summer connected to the output of the sense circuit for adding the compensation current to the write driver current.