Method and circuit for determining the velocity of a data detect

Details Method and circuit for determining the velocity of a data detect Method and circuit for determining the velocity of a data detect

1998-08-17

2000-06-27

Patidar, Jay

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

360 75, 360105, G01P 346, G11B 2102, H02P 700

Patent

active

060811129

ABSTRACT:
A circuit and method for measuring a back EMF voltage of a voice coil in a mass storage device, or the like, includes an amplifier connected across the coil to produce an output signal proportional to a voltage across the coil and a circuit connected to selectively connect the output signal of the amplifier to a circuit output when a driving current is not applied to said coil. A sample window is generated after drive currents within the coil have been allowed to decay to zero, and between a time during which a PWM signal changes from negative to positive and a time when the PWM waveform crosses a voltage error value.

REFERENCES:
patent: 5221881 (1993-06-01), Cameron
patent: 5285135 (1994-02-01), Carobolante et al.
patent: 5297024 (1994-03-01), Carobolante
patent: 5566369 (1996-10-01), Carobolante
patent: 5615064 (1997-03-01), Blank et al.
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 5869946 (1999-02-01), Carobolante
Pedrazzini, "IBM Hard Disk Drive Load/Unload Technology," Computer Data Storage Newsletter, Jul. 1997, vol. 10(7), Issue No. 114, p. 12.

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