Hui Zheng

US Patent:

7134103, Nov 7, 2006

Filed:

Dec 17, 2003

Appl. No.:

10/738708

Inventors:

Michael Werner Beattie - Austin TX, US
Anirudh Devgan - Austin TX, US
Byron Lee Krauter - Leander TX, US
Hui Zheng - Austin TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

716 2, 716 5, 716 7

Abstract:

A method, system, and product are disclosed for determining a voltage drop across an entire integrated circuit package. A geometric description of the entire integrated circuit package is determined. The description is subdivided into non-uniform areas. A resistance of each one of the non-uniform areas is determined. A resistive netlist of the entire integrated circuit package is then determined by combining the resistance of each one of the non-uniform areas. The package is then simulated utilizing the netlist to determine the voltage drop across the entire integrated circuit package.

US Patent:

7302661, Nov 27, 2007

Filed:

Jun 14, 2005

Appl. No.:

11/152580

Inventors:

Michael W. Beattie - Austin TX, US
Anirudh Devgan - Austin TX, US
Byron L. Krauter - Leander TX, US
Hui Zheng - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

716 9, 716 7, 716 11

Abstract:

A method of modeling electromagnetism in an irregular conductive plane, by dividing the surface into a grid of unequal and unaligned rectangles, assigning a circuit node location to a center of each rectangle, and calculating capacitive and inductive parameters based on the center circuit node locations. Rectangulation is accomplished using automated, recursive bisection. Capacitive segments are assigned to each circuit node and coincide with the corresponding rectangles. Inductive segments are assigned between adjacent rectangle pairs, with a width of an inductive segment defined as the common boundary of the corresponding pair of rectangles and the length of the inductive segment defined as the normal distance between circuit nodes of the two rectangles. Placement of the circuit nodes at the centers of the rectangles significantly reduces the number of nodes and segments, and provides a faster yet comprehensive analysis framework.

US Patent:

7590952, Sep 15, 2009

Filed:

Nov 28, 2006

Appl. No.:

11/563704

Inventors:

Michael W. Beattie - Muenchberg, DE
Kevin Beattie, legal representative - Muenchberg, DE
Byron L. Krauter - Round Rock TX, US
Hui Zheng - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

716 1

Abstract:

A computer implemented method, data processing system, and computer usable program code are provided for reducing a chip package model. Responsive to receiving the chip package model, an inductance and a resistance of the chip package model is measured. The inductance and the resistance are measured using only a set of external nodes of the chip package model. A reduced node resistor model and a reduced node inductor model are created using the inductance and the resistance of the chip package model. A combined reduced node resistor-inductor chip package model is formed by combining the reduced node resistor model and reduced node inductor model.

US Patent:

7827514, Nov 2, 2010

Filed:

Sep 3, 2007

Appl. No.:

11/849346

Inventors:

Michael W. Beattie - Austin TX, US
Anirudh Devgan - Austin TX, US
Byron L. Krauter - Leander TX, US
Hui Zheng - Round Rock TX, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/50

US Classification:

716 11, 716 7, 716 12, 716 18

Abstract:

A method of modeling electromagnetism in an irregular conductive plane, by dividing the surface into a grid of unequal and unaligned rectangles, assigning a circuit node location to a center of each rectangle, and calculating capacitive and inductive parameters based on the center circuit node locations. Rectangulation is accomplished using automated, recursive bisection. Capacitive segments are assigned to each circuit node and coincide with the corresponding rectangles. Inductive segments are assigned between adjacent rectangle pairs, with a width of an inductive segment defined as the common boundary of the corresponding pair of rectangles and the length of the inductive segment defined as the normal distance between circuit nodes of the two rectangles. Placement of the circuit nodes at the centers of the rectangles significantly reduces the number of nodes and segments, and provides a faster yet comprehensive analysis framework.

US Patent:

20070136044, Jun 14, 2007

Filed:

Dec 13, 2005

Appl. No.:

11/301731

Inventors:

Michael Beattie - Muenchberg, DE
Byron Krauter - Leander TX, US
Hui Zheng - Round Rock TX, US

International Classification:

G06F 17/50

US Classification:

703014000

Abstract:

A method of simulating a circuit parameter such as voltage or current for a dominantly linear circuit by constructing a circuit equation matrix whose elements correspond to nodes of the circuit, decoupling linear and nonlinear contributions to the circuit parameter based on a partition of an inverse matrix of the circuit equation matrix, computing linear and nonlinear components using the decoupled contributions, and combining the nonlinear and linear components to yield a state of the circuit parameter for a given time step. The computation of the nonlinear component includes Newton-Raphson iterations to linearize nonlinear devices of the circuit, wherein the Newton-Raphson technique is applied to the right-hand side of the circuit state matrix equation. The computations are iteratively repeated for successive time steps which are advantageously separated by a constant time interval to avoid further recalculation of the state matrix.

US Patent:

20080300848, Dec 4, 2008

Filed:

Aug 12, 2008

Appl. No.:

12/189813

Inventors:

Michael W. Beattie - Muenchberg, DE
Byron L. Krauter - Leander TX, US
Hui Zheng - Round Rock TX, US

International Classification:

G06G 7/48

US Classification:

703 14

Abstract:

A method of simulating a circuit parameter such as voltage or current for a dominantly linear circuit by constructing a circuit equation matrix whose elements correspond to nodes of the circuit, decoupling linear and nonlinear contributions to the circuit parameter based on a partition of an inverse matrix of the circuit equation matrix, computing linear and nonlinear components using the decoupled contributions, and combining the nonlinear and linear components to yield a state of the circuit parameter for a given time step. The computation of the nonlinear component includes Newton-Raphson iterations to linearize nonlinear devices of the circuit, wherein the Newton-Raphson technique is applied to the right-hand side of the circuit state matrix equation. The computations are iteratively repeated for successive time steps which are advantageously separated by a constant time interval to avoid further recalculation of the state matrix.

US Patent:

20170297653, Oct 19, 2017

Filed:

Apr 15, 2016

Appl. No.:

15/130914

Inventors:

Hui Zheng - Irvine CA, US
Deyi Pi - Irvine CA, US
Bingqiang Zhu - Irvine CA, US

International Classification:

B62M 7/12
B62K 3/00
B62D 11/00
B62K 21/12
B62J 25/00

Abstract:

A two-wheel, self-balancing vehicle is disclosed. In one aspect, the two-wheel, self-balancing vehicle comprises a first wheel and a second wheel, the first wheel and the second wheel being spaced apart and substantially parallel to one another. The two-wheel, self-balancing vehicle further comprises a foot placement section connecting the first wheel and the second wheel. The two-wheel, self-balancing vehicle further comprises a set of position sensors in the foot placement section, the set of position sensors configured to generate inclination angle signals and velocity signals of the two-wheel, self-balancing vehicle. The two-wheel, self-balancing vehicle further comprises a first gravity sensor and a second gravity sensor in the foot placement section, the first gravity sensor and the second gravity sensor configured to generate weight signals and gravity angle signals. In addition, the two-wheel, self-balancing vehicle comprises a control logic configured to output control signals that control the movement of the two-wheel, self-balancing vehicle in response to the inclination angle signals, the velocity signals, the weight signals, and the gravity angle signals.

US Patent:

20150155771, Jun 4, 2015

Filed:

Dec 23, 2013

Appl. No.:

14/139257

Inventors:

- Irvine CA, US
Hui Zheng - Irvine CA, US
Jungwoo Song - Irvine CA, US
Xicheng Jiang - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H02M 1/14
H02M 3/07

Abstract:

Systems, apparatuses, and methods provided for ping-pong charge pumps. Flying capacitors present in ping-pong charge pumps are operated out of phase to increase equalization periods. Out-of-phase operation also decreases voltage differences between flying capacitors during equalization periods thus decreasing ping-pong charge pump output voltage ripple and snapback. The voltages of the flying capacitors may be equalized without the use of an equalization switch. Differential control currents that are based on the voltage difference between the flying capacitors are used to enable or disable the flying capacitors from driving an output load of the ping-pong charge pump during certain phases of operation. A capacitor with a lower voltage may be disabled, thus providing for voltage equalization as the enabled capacitor sources current to the output load. The flying capacitors are also equalized during overlapping time periods in which the flying capacitors are charging.