Patent ID: 6236343
Filing Date: 2001-05-22
Classification: G11B,H03L

Abstract:
A storage media system comprising:a storage media having a media head for reading data from the storage media and generating a corresponding data signal;a pre-amplifier coupled to the media head to receive a corresponding data signal and generating an amplified data signal;a control amplifier (VGA) coupled to the pre-amplifier to receive the amplified data signal and generate an associated controlled amplified data signal;a low-pass filter coupled to received the controlled amplified data signal and generating an associated shaped analog data signal; anda loop latency compensated PLL filter coupled to the low-pass filter to receive the shaped analog data signal, the loop latency compensated PLL filter comprising:an analog-to-digital converter (A/D), the A/D receiving the shaped analog data signal and generating a digitized signal;a phase detector, the phase detector coupled to the A/D to receive the digitized signal and generating an estimated phase error;a second filter coupled to the phase detector to receive as a first input the estimated phase error, the second filter also coupled to a delayed phase compensation register to receive a phase compensation input signal, and to a state compensation multiplier to receive a state compensation input signal, wherein the filter provides a latency compensated phase error output; anda second accumulator that is coupled to the second filter to receive the latency compensated phase error output and generate a latency compensated phase error control signal.