Ping H Lo

US Patent:

7336058, Feb 26, 2008

Filed:

Feb 6, 2007

Appl. No.:

11/671793

Inventors:

Ping Lo - Santa Clara CA, US
Xuecheng Jin - Palo Alto CA, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

G05F 1/40

US Classification:

323269

Abstract:

A low dropout (LDO) voltage regulator having more than one LDO modules, each LDO module having a frequency response adapted to a certain range of output frequency. The LDO voltage regulator can provide a gain over a broad range of operating frequency by combining output current from each LDO module and providing the combined current at an output of the LDO voltage regulator. The LDO voltage regulator further comprises a load monitor coupled to the LDO modules for disabling some of the LDO modules to reduce power consumption of the LDO voltage regulator.

US Patent:

7405689, Jul 29, 2008

Filed:

Dec 21, 2005

Appl. No.:

11/316636

Inventors:

Kent Kernahan - Cupertino CA, US
Xuecheng Jin - Palo Alto CA, US
Ping Lo - Santa Clara CA, US
Ion E. Opris - San Jose CA, US
Sorin Andrei Spanoche - Santa Clara CA, US

Assignee:

Exar Corporation - Fremont CA

International Classification:

H03M 1/12

US Classification:

341156, 341155

Abstract:

Methods and devices perform analog to digital signal conversion in shorter time and/or with less power consumption than that of a comparable analog to digital conversion that uses a conventional sequential approximation method based on a binary search. A predictive guess is supplied as a digital first signal. The digital first signal is converted (D/A) to a counterpart, analog guess signal. Fewer cycles and less power is consumed if the initial guess is within a certain range of the actual magnitude of the analog input sample signal. In one embodiment, a digital modeler is used to model a process underlying the analog input sample signal to thereby provide fairly good guesses.

US Patent:

7474130, Jan 6, 2009

Filed:

Feb 6, 2007

Appl. No.:

11/671810

Inventors:

Ping Lo - Santa Clara CA, US
Xuecheng Jin - Palo Alto CA, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M 11/00
H03L 7/06

US Classification:

327103, 327152, 327143, 327362

Abstract:

A voltage-to-current converter providing an output current with compensation for process-voltage-temperature (PVT) variations of a component in the voltage-to-current converter. The voltage-to-current converter includes a first voltage-to-current converter branch, a second voltage-to-current converter branch, and a compensation current path. The first voltage-to-current converter provides a first current to the output of the voltage-to-current converter based on a variable control voltage. The second voltage-to-current converter branch provides a second current based on a fixed voltage. The compensation current path provides a compensation current from the second voltage-to-current branch to the first voltage-to-current converter branch compensating variations in the first current caused by the PVT variations of the component in the first voltage-to-current converter branch.

US Patent:

7609185, Oct 27, 2009

Filed:

Jun 20, 2008

Appl. No.:

12/143708

Inventors:

Kent Kernahan - Cupertino CA, US
Xuecheng Jin - Palo Alto CA, US
Ping Lo - Santa Clara CA, US
Ion E. Opris - San Jose CA, US
Sorin Andrei Spanoche - Santa Clara CA, US

Assignee:

Exar Corporation - Fremont CA

International Classification:

H03M 1/10

US Classification:

341120

Abstract:

Methods are disclosed for performing analog to digital signal conversion in shorter time and/or with less power consumption. A predictive guess is supplied as a digital first signal. The digital first signal is converted (D/A) to a counterpart, analog guess signal. A comparison is made between the analog guess signal and a received, analog input sample signal. The result of the comparison is used to improve on the initially supplied guess in a next cycle. Fewer cycles and less power is consumed if the initial guess is within a certain range of the actual magnitude of the analog input sample signal.

US Patent:

20130119954, May 16, 2013

Filed:

Nov 13, 2012

Appl. No.:

13/676049

Inventors:

Ping Lo - Campbell CA, US

Assignee:

IWATT INC. - Campbell CA

International Classification:

G05F 1/10

US Classification:

323280

Abstract:

A low-dropout (LDO) voltage regulator includes a switch to generate an output current, and a first sensing module that increases the speed at which the switch is turned off and the output current is decreased in response to detecting a decreasing load current. The LDO regulator further includes a second sensing module that increases the speed at which the switch is turned on and the output current is increased in response to detecting an increasing load current.

US Patent:

59333855, Aug 3, 1999

Filed:

Jul 31, 1997

Appl. No.:

8/903720

Inventors:

Yong Jiang - Milpitas CA
Ping Lo - Sunnyvale CA

Assignee:

Integrated Silicon Solution Inc. - Santa Clara CA

International Classification:

G11C 700

US Classification:

36523001

Abstract:

A flexible memory controller capable of performing any combination of read, write and deselect operations is described. The present invention can store two pending write or read operations and perform a third write or read operation. In a ZBT SRAM embodiment the memory controller has three address registers, two data registers, and two comparators. Addresses for pending memory access operations are shifted in the address registers so that memory access addresses can be stored without overwriting the memory addresses for the pending operations. Similarly, data is shifted in the data registers to ensure that data remains available for pending memory access operations. The specific register operations are controlled by a thirteen state state machine. The thirteen states and the relationships between the states are defined to enable the memory controller to perform any combination of read, write and deselect operations without inserting idle cycles. When a read address matches the address of a pending write operation it indicates that the data that the read address is intended to retrieve has not yet been written to the memory array.

US Patent:

20160007417, Jan 7, 2016

Filed:

Jul 7, 2014

Appl. No.:

14/325009

Inventors:

- Campbell CA, US
Ping Lo - Santa Clara CA, US
Juyoung Yoon - San Ramon CA, US

International Classification:

H05B 33/08
H02M 1/36
H02M 1/08

Abstract:

Embodiments described herein describe a power supply controller configured to control a power supply that provides power to an output load via a power supply transformer. The power supply controller includes a first terminal that provides supply voltage to the controller. The controller also includes a second terminal coupled to a switch external to the controller, the switch is part of a power converter controlled by the controller, wherein the second terminal is used for an initial power up of the power converter when the switch is turned on and used for a second functionality when the switch is turned off.