| 摘要 |
A system and method are disclosed for reading data from a magnetic disk. The method includes generating a preamplified data signal by reading the magnetic state of the disk using a magnetoresistive head. The preamplified data signal is capacitively coupled to a variable gain read channel amplifier. The variable gain read channel amplifier has an input, an output, and a programmable gain. The input of the variable gain read channel amplifier has a variable gain read channel amplifier input resistance. The occurrence of a thermal asperity event is detected and an adjustment is made to the variable gain read channel amplifier input resistance to compensate for the thermal asperity event. An adjustment to the programmable gain of the variable gain read channel amplifier is made to compensate for the adjustment to the variable gain read channel amplifier input resistance. |
