Patent ID: 6256161
Filing Date: 2001-07-03
Classification: G11B

Abstract:
An echo cancellation circuit for a read preamplifier of a disk drive having a transducing head connected to the preamplifier by an electrical interconnect having a first time delay, a first interface between the preamplifier and the electrical interconnect having a first reflection coefficient and a second interface between the transducing head and the electrical interconnect having a second reflection coefficient, the preamplifier receiving a composite signal comprising a first signal from the transducing head and a reflection signal based on a reflection of the first signal by the first and second interfaces, the reflection signal being delayed from the first signal by the electrical interconnect, the echo cancellation circuit comprising:a delay element for connection to the preamplifier, the delay element having a second time delay double the first time delay to provide a delay signal delayed from the first signal;a filter for stimulating effects of the first and second reflection coefficients on the delay signal; anda summing circuit for subtracting the filtered delay signal from the composite signal.