Mark Alexander - Austin TX, US Krishnan Subramonium - Austin TX, US Golam Chowdhury - Austin TX, US Kartika Prihadi - Austin TX, US Bryan Cope - Austin TX, US
Assignee:
Cirrus Logic, Inc. - Austin TX
International Classification:
H03G003/10 H03G003/30
US Classification:
330284, 381120, 333 81 R
Abstract:
An attenuator includes a first stage having a first operational amplifier and a tapped resistor. Tapped resistor has an input for receiving input data, an output coupled to an output of first operational amplifier , and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of first operational amplifier. Each of these sequences of voltages corresponds to an attenuation step such that first stage steps the attenuation produced by the attenuator from an intermediate value to a predetermined ending value. A second stage includes a second operational amplifier and a tapped resistor. Tapped resistor includes an input for receiving analog data from first stage , an output coupled to an output of second operational amplifier , and a plurality of taps for selectively presenting a sequence of voltages to a noninverting input of operational amplifier. Each of the sequence of voltages corresponds to an attenuation step, a second stage stepping the attenuation from a predetermined starting value to the intermediate value.
Hardware Efficient Digital Control Loop Architecture For A Power Converter
Mark A. Alexander - Austin TX, US Douglas E. Heineman - Lakeway TX, US Kenneth W. Fernald - Austin TX, US Scott K. Herrington - Cedar Park TX, US
Assignee:
Zilker Labs, Inc. - Austin TX
International Classification:
H03M 1/88 H03M 1/12
US Classification:
341138, 363 34
Abstract:
A power converter including a hardware efficient control loop architecture. Error detection circuitry may generate an error signal based on the difference between a power converter output voltage and a reference voltage. An oversampling ADC may digitize the error signal. The transfer function associated with the ADC may include quantization levels spaced at non-uniform intervals away from a center code. A digital filter may calculate the average of the digitized error signal. A nonlinear requantizer may reduce the number of codes corresponding to the output of the digital filter. A proportional integral derivative (PID) unit may multiply the output of the nonlinear requantizer by PID coefficients to generate a PID duty cycle command, and a gain compensation unit may dynamically adjust the PID coefficients to maintain a constant control loop gain. A noise-shaped truncation unit including a multi-level error-feedback delta sigma modulator may reduce the resolution of the PID duty cycle command.
Transient Processing Mechanism For Power Converters
Transient processing mechanisms for power converters. Error generation circuitry in a power converter may generate an error signal based on the difference between a power converter output voltage and a reference voltage. Transient detection circuitry may detect whether the error signal exceeds at least a first threshold. If the first threshold is exceeded, timing control logic may generate a low band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the first threshold. If the error signal exceeds a second threshold, the timing control logic may generate a high band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the second threshold. The timing control logic may initiate a low band blanking period following the low band correction pulse and high band blanking period following the high band correction pulse.
Transient Processing Mechanism For Power Converters
Transient processing mechanisms for power converters. Error generation circuitry in a power converter may generate an error signal based on the difference between a power converter output voltage and a reference voltage. Transient detection circuitry may detect whether the error signal exceeds at least a first threshold. If the first threshold is exceeded, timing control logic may generate a low band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the first threshold. If the error signal exceeds a second threshold, the timing control logic may generate a high band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the second threshold. The timing control logic may initiate a low band blanking period following the low band correction pulse and high band blanking period following the high band correction pulse.
Power Converter With Transient Processing Capability
Transient processing mechanisms for power converters. Error generation circuitry in a power converter may generate an error signal based on the difference between a power converter output voltage and a reference voltage. Transient detection circuitry may detect whether the error signal exceeds at least a first threshold. If the first threshold is exceeded, timing control logic may generate a low band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the first threshold. If the error signal exceeds a second threshold, the timing control logic may generate a high band correction pulse to adjust the power converter output voltage, and thereby adjust the error signal to a level within the second threshold. The timing control logic may initiate a low band blanking period following the low band correction pulse and high band blanking period following the high band correction pulse.
Multi-Edge Pulse Width Modulator With Non-Stationary Residue Assignment
Mark Andrew Alexander - Austin TX, US Douglas Edward Heineman - Lakeway TX, US
Assignee:
Equiphon, Inc. - Austin TX
International Classification:
H03K 7/08
US Classification:
375238, 370205, 332109
Abstract:
An improved method for generating pulse width modulated signals, e. g. , for use in audio amplifiers, power amplifiers, etc. An input digital value is received and divided by a number N, producing a quotient and a residue. A plurality N of edge modulation values may then be generated based on the quotient and the residue. Each of the N edge modulation values specifies an edge of the pulse width modulated signal to be generated. Generation of the N edge modulation values may comprise applying the residue to one or more of the N edge modulation values when the residue is greater than zero. The residue may be applied to different ones of the plurality N of edge modulation values during different iterations of the method in a non-stationary fashion. The pulse width modulated signal may then be generated based on the N edge modulation values.
Attenuating Non-Linear Noise In An Amplifier With Alternating Dc -Offset Correction
Douglas E. Heineman - Lakeway TX, US Mark A. Alexander - Austin TX, US
International Classification:
H03K 5/00 H03F 3/20
US Classification:
330207 A, 327552
Abstract:
An amplifier may include two or more pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A positive DC-offset based on the source signal may be applied to the pulse-width modulator controlling one respective set of switches, and an equal value negative DC-offset may be applied to the pulse-width modulator controlling the other respective set of switches, to provide an effective offset between the respective points in time of the rising/falling edges of the different pulse-width modulated control signals. The addition of alternating positive and negative DC-offset values doesn't affect the output load, and doesn't degrade the signal. The DC-offsets may be added at a frequency selected to be beyond the signal baseband, and the value of the small input signal level may be determined using an RMS level comparator or similar measurement technique.
Attenuating Noise And Cross-Talk In An Audio System By Offsetting Outputs In Phase
Douglas E. Heineman - Lakeway TX, US Mark A. Alexander - Austin TX, US
International Classification:
H03F 1/32 H03F 3/217
US Classification:
330251, 330207 A
Abstract:
An amplifier may include two or more pulse-width modulators (PWMs) controlling respective sets of switches to produce an amplified version of a source signal. The clocking for the amplifier may be controlled to delay signal processing within the PWMs relative to one another in time, thereby providing an effective time offset between the respective edge transitions of the controlling signals provided to the respective sets of switches. The PWMs may count down to zero from the next PWM duty-cycle value when a new data sample is detected, beginning a new count for each new sample, with the PWM outputting a pulse when the counter value is nonzero. A “data-sample-ready” signal may be decoded from a master counter, which may be clocked based on the high speed PWM clock, and the decode value may be adjusted to determine when the PWM should initialize to the next data sample.
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Mark Alexander. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Mark Alexander may refer to: Mark Alexander (painter) (born 1966), ...
keller williams realty 1801 S. Mopac Expy, Suite 100, Austin, TX 78749 (512)4484111 (Office), (512)8004443 (Cell)
Description:
Like many, Austin popped up on my radar several years ago. I can now proudly call Austin my home. When we moved from Las Vegas to here, we were struck by the strong sense of community and the genuine hospitality that only comes from the heart. I am married to a wonderful woman and blessed with two handsome sons, who are thrilled to be immersed in what central Texas has to offer. After graduating from the University of Georgia with a degree in English, I followed my passion for food and graduated from the Culinary Institute of America. Spending nearly 11 years in the service industry with Emeril Lagassee's restaurant group, I've learned that sucess is based on relationship. I have the knowledge and ability to offer you unmatched personal service through every step of your transaction, but mantaining communication during andafter the sale or purchase sets me apart from other realtors. If you are thinking of making Austin your new home or if you are already an Austinite wanting to buy or sell, contact me so I may be your advocate for one of the largest financial investments in your life.
Dr. Alexander graduated from the Univ of Alexandria, Fac of Med, Alexandria, Egypt (330 03 Pr 1/71) in 1983. He works in Ventnor City, NJ and specializes in Internal Medicine. Dr. Alexander is affiliated with Atlanticare Regional Medical Center and Shore Medical Center.
Childrens Hospital Boston Cardiology 300 Longwood Ave FL 2, Boston, MA 02115 (617)3554256 (phone), (617)7386289 (fax)
Education:
Medical School Boston University School of Medicine Graduated: 1985
Procedures:
Cardiac Catheterization Electrocardiogram (EKG or ECG)
Conditions:
Atrial Fibrillation and Atrial Flutter Cardiac Arrhythmia Congenital Anomalies of the Heart
Languages:
Chinese English French German Spanish Vietnamese
Description:
Dr. Alexander graduated from the Boston University School of Medicine in 1985. He works in Boston, MA and specializes in Pediatric Cardiology and Clinical Cardiac Electrophysiology. Dr. Alexander is affiliated with Boston Childrens Hospital.
Dr. Alexander graduated from the University of Minnesota Medical School at Minneapolis in 2001. He works in Bloomington, MN and specializes in Orthopaedic Surgery and Orthopedic Sports Medicine.
Mark F Alexander MD 8215 N Newland Ave, Niles, IL 60714 (847)7279323 (phone)
Education:
Medical School Ain Shams Univ, Fac of Med, Abbasia, Cairo, Egypt (330 04 Pr 1/71) Graduated: 1966
Languages:
English
Description:
Dr. Alexander graduated from the Ain Shams Univ, Fac of Med, Abbasia, Cairo, Egypt (330 04 Pr 1/71) in 1966. He works in Niles, IL and specializes in Anesthesiology.
University of Cincinnati - Comm Arts, Dayton Christian High School
Mark Alexander
Work:
MTC Williams F1 National Basketball Association Eurosport Television Guardian Media Group
About:
Mark has a track record of delivery in launching sports businesses, M&A, marketing and media as a broadcaster, global rights holder and as a consultant. Mark advises brands, investors and governm...
Tagline:
Sports planning and tea. That's about the size of it.
Mark Alexander
Work:
Old Fort Software LLC - Owner (2007) Old Fort Wildlife Control - Owner (2006) ProphetLine - Senior Programmer (1993)
Education:
University of Arkansas - Fort Smith - Computer/Info Mgmt
Mark Alexander
Work:
ALUMpro - Business Owner
Education:
John McGregor
Relationship:
Married
About:
Alumpro is a Company which specializes in installations for roofing, siding, eavestroughing and complete residential renovations.
Tagline:
Striving to be, "a cut above"
Mark Alexander
Work:
Imperva - IT Systems Developer (2009) Sun Microsystems - IT Systems Technologist (2008-2009) MySQL AB - Applications Analyst (2007-2008)
Mark Alexander
Work:
Guru PC - Tech
Education:
Hard Knocks
Bragging Rights:
Survived Hurricane Kat...currently in Flight School...
Mark Alexander
Education:
St Wilfreds RC High School
Tagline:
ERM I didn't know what to put here!
Bragging Rights:
Never married, no kids so I look a bit younger than my years! Not bragging or anything. :-)