Patent ID: 6246533
Filing Date: 2001-06-12
Classification: G11B,H03K

Abstract:
A write driver circuit of a magnetic read/write system comprising:a first input terminal and a second input terminal for receiving a first write signal and a second write signal, respectively, wherein when the first write signal is high, the second write signal is low and wherein when the first write signal is low, the second write signal is high;a first transistor and a second transistor electrically coupled to each other and to the first and second input terminals, wherein when the first write signal is high and the second write signal is low, the first and second transistors are turned on;a third transistor and a fourth transistor electrically coupled to each other and to the first and second input terminals, wherein when the second write signal is high and the first write signal is low, the third and fourth transistors are turned on;an inductive element having a first terminal and a second terminal, the first terminal of the inductive element being coupled to the first and fourth transistors and the second terminal of the inductive element being coupled to the second and third transistors such that when the first write signal is high and the second write signal is low, current passes through the inductive element in a direction from the first terminal of the inductive element toward the second terminal of the inductive element, and wherein when the first write signal is low and the second write signal is high, current passes through the inductive element in a direction from the second terminal of the inductive element toward the first terminal of the inductive element;a damping resistor connected in parallel with the inductive element; anda variable common mode circuit component for allowing a common mode output voltage of the write driver circuit to be varied and to be set to a preselected value.