Bertram Rean White DeceasedPerris, CA

6380703, Apr 30, 2002

Mar 15, 2001

09/681308

Bertram J. White - Irvine CA

Texas Instruments Incorporated - Dallas TX

H02P 118

318254, 318439, 318138, 318459, 318500, 3889281

A circuit for providing commutation control signals to a commutator for a polyphase brushless dc motor in a mass data storage device includes an accumulator ( ) to accumulate a digital count that is proportional or related to a phase difference between the commutation control signals and a motor bemf. A digital variable frequency oscillator ( ) generates an oscillator output signal of frequency proportional to the digital count to reset the accumulator ( ) after a predetermined time determined by the frequency. The circuit may also include a digital filter ( ) between the digital accumulator ( ) and the digital variable frequency oscillator ( ) to generate a magnitude signal (DRC) of magnitude proportional to the accumulated count for delivery to the variable frequency oscillator ( ) to control the frequency thereof.

6441681, Aug 27, 2002

Jun 7, 2001

09/876449

Bertram J. White - Irvine CA
Tanchu Shih - Irvine CA

Texas Instruments Incorporated - Dallas TX

G05F 302

327545, 327198

The present invention includes a circuit to maintain a constant voltage on a storage element such as a capacitor at the output of a regulator during an emergency power condition. It includes a detector to detect the emergency condition and to generate a fault signal in response to the emergency condition, a one-shot time delay circuit to delay the enabling of a regulator in response to the fault signal, and a second delay unit to delay the enabling of the load of a regulator to accommodate the non-zero recovery time of a regulator. These two time delay units are able to bypass the noisy switching on the fault signal so that the maintained voltage on the storage capacitor will not droop and can be reliably used for such purposes as head retract and spindle brake under a noisy power emergency situation.

6483377, Nov 19, 2002

Jan 10, 2001

09/758961

Bertram J. White - Irvine CA
Ying Zhang McCleary - Irvine CA

Texas Instruments Incorporated - Dallas TX

G05F 110

327536

The present invention includes a charge pump circuit to raise a voltage including a voltage source to generate the voltage to be raised, a pair of switches to switch the voltage to a capacitor with the first pair of switches operating during different periods of time and a second pair of switches to switch additional voltage to the capacitor with the second pair of switches operating during different periods of time.

6538304, Mar 25, 2003

Nov 16, 2000

09/715383

Bertram J. White - Irvine CA

Texas Instruments Incorporated - Dallas TX

H01L 2348

257666, 257659, 257725, 257691, 257690, 257698, 257696, 257203, 257528, 257355, 257207, 257211, 361126, 361712, 361 56, 361 91, 174 524, 174261

A lead frame for an integrated circuit includes a ground for the integrated circuit to ground the integrated circuit, the lead frame having at least one corner connected to the ground; and a connector between the corner of the lead frame and the ground located on the integrated circuit.

6819072, Nov 16, 2004

Mar 26, 2001

09/817695

Bertram J. White - Irvine CA
Kevin W. Ziemer - Huntington Beach CA

Texas Instruments Incorporated - Dallas TX

G05B 1101

318560, 318138, 318254, 318438, 318439, 360 7301, 360 7302, 360 741, 360 75, 360 7804

A spindle motor control circuit for controlling a motor; including a control circuit to control the motor during at least a low state, a pulse state and a high state, the motor braking during said low state, the control circuit receiving a flyback voltage from the motor during the pulse state and the control circuit receiving a reduced flyback voltage from the motor during the high state.

2002002, Mar 7, 2002

Sep 20, 2001

09/957369

Bertram White - Irvine CA, US

Texas Instruments, Inc.

H02P001/18
H02P003/08
H02P005/06
H02P007/06
H02K023/00

318/254000

A method and circuit () for driving a polyphase dc motor () of the type used in a mass data storage device () includes a commutator () for commutating drive voltages among windings (-) of the dc motor (). In each commutation cycle, drive voltages are applied to two windings and a current summed from currents induced by the drive voltages is sunk from a third winding. A circuit () is provided for pulse width modulating the drive voltages during successive phase commutation cycles in respective pulse width modulated (PWM) cycles, and a circuit () is provided for measuring an amount of energy delivered to the motor from a beginning of each PWM cycle. A circuit (--) terminates the drive voltages in a PWM cycle when the circuit () for measuring measures a predetermined amount of energy that has been delivered to the motor during the PWM cycle.

4433210, Feb 21, 1984

Apr 19, 1982

6/369356

Carl L. Ostrowski - Mt. Clemens MI
Bertram White - Tustin CA

Federal Screw Works - Detroit MI

G10L 100

381 53

A phoneme-based speech synthesizer that is particularly adapted for implementation on a single integrated circuit chip. The vocal tract is comprised of a fixed resonant filter and a plurality of tunable resonant filters whose resonant frequencies are controlled in accordance with the values of certain control parameters. The vocal tract is implemented utilizing a capacitive switching technique which eliminates the need for large valued components to achieve the relatively low frequencies of human speech. In addition, a novel digital transition circuit is included which gradually transitions the values of the vocal tract control parameters as they change from phoneme to phoneme. A unique glottal source generator is also disclosed which is adapted to digitally generate a glottal pulse signal in a manner which readily permits the glottal pulse to be spectrally shaped in any desired configuration.

5319289, Jun 7, 1994

Feb 24, 1992

7/840440

Charles C. Austin - Mission Viejo CA
Bertram J. White - Irvine CA

Silicon Systems, Inc. - Tustin CA

H02P 602

318254

A circuit to provide adaptive commutation delay for multi-pole brushless DC motors. The circuit adjusts the commutation delay as a function of the rotational speed of the motor to maximize motor torque and minimize power consumption. Unlike the prior art, the circuit avoids the need for complex circuitry or external components. The circuit may be implemented entirely within a single integrated circuit. The circuit includes a back-EMF sensing input, an oscillator, a voltage holding and proportioning circuit, one or more comparators and, optionally, an external control circuit. The back-EMF sensing input controls the operation of the oscillator. The voltage holding and proportioning circuit processes the oscillator output and provides outputs which are compared by the comparators. The comparators produce commutation delay signals and, optionally, other signals. The circuit also allows adjustment to compensate for non-ideal back-EMF-to-rotor-position correspondence or fixed time delays inherent in the commutation process.