Circuitry and methods for adjusting and switching the gain of a

Details Circuitry and methods for adjusting and switching the gain of a Circuitry and methods for adjusting and switching the gain of a

1998-12-16

2000-04-25

Ip, Paul

Electricity: motive power systems

Positional servo systems

318561, 369 4435, 369 4436, G05B 1101, G05B 1300, G11B 700

Patent

active

060548282

ABSTRACT:
Disclosed is a tracking control integrated circuit (IC) system implementation and method for controlling the gain of a digital-to-analog converter in a disk drive system. The tracking control IC system includes components defined in integrated circuit chips and components defined on a printed circuit board. The tracking control IC system is configured to be implemented in a disk drive system that includes a disk media. The tracking control IC system includes a servo controller chip that includes a compensator/processor, the digital-to-analog converter, and a switch. The switch is configured to receive a high gain signal (being Low or High) for setting the switch in an open state or a closed state. The tracking control IC system further includes a power amplifier chip having amplifying elements. The power amplifier chip has a first input and a second input, both of which connect to selected ones of the amplifying elements. The digital-to-analog converter includes a first output that is in communication with the switch and the first input of the power amplifier chip. The digital-to-analog converter has a second output that is in communication with the switch, and the switch has an output that is coupled to the first input of the power amplifier chip through the selected amplifying elements. The switch therefore enables the tracking control IC system to have a wider dynamic range control voltage Vc without increasing the die area of the servo control chip, without adding external active components to the PCB, and without increasing the control signal's susceptibility to noise pickup or offsets.

REFERENCES:
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patent: 5963520 (1999-10-01), Kubo et al.
patent: 5963524 (1999-10-01), Tokiwa et al.

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