System and method for measuring readback signal amplitude...

Details System and method for measuring readback signal amplitude... System and method for measuring readback signal amplitude...

2006-08-08

2008-08-12

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S031000

Reexamination Certificate

active

07411754

ABSTRACT:
A method for operating a tester for testing heads and disks of a magnetic recording disk drive during manufacturing calculates the readback signal amplitude asymmetry in the frequency domain without the need for measurement in the time domain with a peak detection channel. The tester first signals the write head to write a first pattern on the disk to generate a readback signal with positive pulses. The read head then detects this first recorded pattern and sends the readback signal to a spectrum analyzer connected to the tester. The tester then signals the write head to write a second pattern on the disk to generate a readback signal with negative pulses. The read head then detects this second recorded pattern and sends the readback signal to the spectrum analyzer. The spectrum analyzer measures the amplitudes of the first and second readback signals in the frequency domain using a bandpass filter. A controller in the tester calculates readback signal amplitude asymmetry from the measured amplitudes of the first and second readback signals.

REFERENCES:
patent: 4142215 (1979-02-01), Roberts
patent: 5485320 (1996-01-01), Vogel et al.
patent: 6072647 (2000-06-01), Hiramatsu
patent: 6529340 (2003-03-01), Gowda et al.
patent: 2007/0195444 (2007-08-01), Annampedu
patent: 8221924 (1996-08-01), None
Luo et al., “Experimental Study of Amplitude Asymmetry Effects in Perpendicular Recording”, IEEE Transactions on Magnetics, vol. 39, No. 5, Sep. 2003, pp. 2222-2224.

Affiliated with

Also associated with

Rating

System and method for measuring readback signal amplitude... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for measuring readback signal amplitude..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for measuring readback signal amplitude... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4012686