Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1999-02-25
2000-10-03
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327262, G01F 166
Patent
active
061278696
ABSTRACT:
A circuit for calibration of the NLTS correction value provided for the NLTS correction circuit to realize its high precision of the amount of the NLTS correction. The circuit for calibrating the NLTS correction value of the present invention comprises a duty cycle-voltage converter (D/V converter) for receiving the output signals of the NLTS correction circuit and converting the duty cycle of the signals to voltage values, an A/D converter for converting the analog output from the D/V converter to digital values, and an delay line control device for controlling the amount of delay of each delay line in accordance with the output of the A/D converter. To providing the circuit for calibrating the NLTS correction value of the present invention for the NLTS correction circuit, the amount of delay of the delay lines is required to be controllable with the delay line control device. Additionally, by providing a frequency spectrum analyzer for analyzing frequency spectrum of the output from the recording amplifier, the calibration of the amount of the NLTS correction including the output from the recording amplifier is realized.
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patent: 5317219 (1994-05-01), Lupi et al.
IEEE Transaction on Magnetics, vol 31, No. 1, Jan. 1995, pp. 816-819, Guo Mian, "An Algorithm for a Real Time Measurement of Nonlinear Transition Shift by a Time Domain Correlation Analysis".
IEEE Transaction on Magnetics, vol. 27, No. 6, Nov. 1991, pp. 4831-4833, J. Moon et al., "Nonlinear Effects of Transition Broadening".
VM65070 Analog PRML Channel, Feb. 1997, pp. 6-139, 6-168, "Advance Information".
Hewlett--Packard Company
Lam Tuan T.
Nguyen Linh
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