Patent ID: 7110204

Claim:
A circuit, comprising: an H-bridge writer adapted to provide a write current Iw, including a head current Iw 1 to a hard disk drive head, the head having a resistance Rh, and a current Iw 2 to a damping resistor Rp in parallel with the head, wherein Iw=Iw 1 +Iw 2 , such that the head current Iw 1 is the same as the current that would flow to the head if the parallel resistor Rp were not connected to the head, wherein the writer includes a Digital-to-Analog Converter (DAC) having a binary DAC code represented as N and providing current Iw, the DAC receiving a reference current I REF , providing a LSB current of I (lsb) and a residue current Iwo,Iw=N*I(lsb)+Iwo, and the writer is formed on an integrated circuit (IC), and wherein the writer has an on-chip resistor (Rint) of the same type as parallel resistor Rp, and a bandgap voltage reference (VBG).