Texas Instruments Corporation

Dennis V Hahn

William Robert Krenik

Roy Clifton Jones, Iii

Rolf Lagerquist

David R Cotton

Shaibal Barua

Edward N Jeffrey

A circuit to pull down a driver circuit of a motor, including a circuit to monitor the input signal to a driver amplifier to compare the input signal with the output signal from the motor and to output a difference signal when the input signal and the output signal are different, and a circuit to pull down the driver circuit in response to the difference signal.

Anti-glitch circuit for voice-coil-motor servo operation in disk drive

A system for driving hard disk drive spindle and actuator motors is disclosed. The system comprises a spindle motor control circuit (120), a spindle motor power circuit (210), an actuator motor control circuit (110), and an actuator motor power circuit (210). The spindle motor control circuit (120) and the actuator motor control circuit (110) are formed on a first substrate (100). The spindle motor power circuit (210) and the actuator motor power circuit (220) are formed on a second substrate (200). The system also includes at least one disk (22) attached to a rotatable spindle (21), a spindle motor (400) for receiving and being energized by the spindle motor power signals, and for controlling the rotation of the spindle (21), a plurality of disk read heads (12) adjacent to the disks (22), and an actuator motor (300) for receiving and being energized by the actuator motor power signals, and for controlling the position of the disk read heads (12).

Method and circuit for driving hard disk drive spindle and actuator

A shock sensor circuitry (26) is provided for processing an input signal generated by a shock sensor (28) in response to the shock sensor (28) detecting a force or shock. The shock sensor circuitry (26) includes a leakage tolerant input amplifier (38) for receiving the input signal, and any leakage currents that may also be provided, and amplifying the input signal to generate an amplified input signal. The leakage tolerant input amplifier (38) provides an ac gain of ten and a dc gain of zero. The shock sensor circuitry (26) also includes a filter and amplification circuit and a window comparator. The filter and amplification circuit filters the amplified input signal and amplifies select frequencies of the amplified input signal to generate a summed signal that is provided to the window comparator and compared to a reference value. The window comparator includes an upper comparator (58), a lower comparator (60), and an output circuit (62) to generate a shock sensor circuitry output signal that indicates whether a shock or force was received at a magnitude greater than the reference value.

Shock sensor circuitry and method for amplifying an input signal

The present invention includes a circuit for detecting a back EMF signal for a motor. The circuit includes a circuit 200 for detecting when the back EMF signal from the motor is either a positive EMF signal or a negative EMF signal, a positive source circuit 302 to supply a positive current, a negative source circuit 304 to supply a negative current, a switch circuit 120 and 122 to connect the positive source circuit to an output circuit 410 of the back EMF signal circuit and to connect the negative source circuit to the output circuit, and the output circuit outputting the positive source current while the positive EMF signal is detected and outputting the negative current while the negative EMF signal is detected.

Growing community of inventors

Plano, TX, United States of America

Dennis V Hahn