Patent ID: 6064261
Filing Date: 2000-05-16
Classification: G11B,H03F

Abstract:
A write amplifier comprising:A. an emitter coupled pair of transistors, including a first transistor and a second transistor, each of said first and second transistors having an emitter, a base, and a collector, wherein:i. said collectors are each coupled by way of an associated collector resistor to a first reference potential, and are adapted to permit coupling of a magnetic write head therebetween,ii. said emitters are each coupled to a common node, said common node being coupled to a voltage source, andiii. said bases of said first and second transistors are coupled together and are AC coupled to a second reference potential, andwherein further, an emitter resistor is coupled between said common node and the respective emitters of said first and second transistors, andB. a write data current steering network responsive to an applied binary write data signal to generate first and second write drive signals, said first and second write drive signals being complimentary, wherein said write data current steering network includes means for coupling said first and second write drive signals to a respective one of said emitters of said first and second transistors, whereby current from said voltage source is switched between said first and second transistors as a function of the binary value of said applied binary write data signal.