HONGLEI WU
Pilots at Andover Dr, Sunnyvale, CA
License number
California A4833443
Issued Date
Jun 2014
Expiration Date
Jun 2019
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1164 Andover Dr, Sunnyvale, CA 94087
Professional information
Conditionally-Stable Operational Amplifier With Tunable Wideband Buffers
US Patent:
2014003, Feb 6, 2014
Filed:
Aug 1, 2012
Appl. No.:
13/564197
Inventors:
Honglei Wu - Sunnyvale CA, US
International Classification:
H03G 3/30
US Classification:
330278
Abstract:
A method for processing signals may include, in a conditionally-stable operational amplifier, shifting the gain curve of the conditionally-stable operational amplifier to a desired position, by buffering at least one output signal from at least one transconductance module within the conditionally-stable operational amplifier using a buffer. The desired position of the gain curve may be associated with a desired feedback factor. The shifting of the gain may take place without shifting a corresponding phase. The tuning of the buffer may be based on the desired position of the gain curve which is derived from feedback factor value(s) specified by an application. A phase corresponding to the desired position of the gain curve at 0 dB frequency may be greater than a threshold phase. The buffering may be tuned using at least one tunable wideband buffer so that the corresponding phase at 0 dB frequency remains higher than the threshold phase.
Switch Sequencing For Code-Range-Specific Linearity Improvement In Digital-To-Analog Converters
US Patent:
8456342, Jun 4, 2013
Filed:
May 3, 2011
Appl. No.:
13/099797
Inventors:
Honglei Wu - Sunnyvale CA, US
Mengchang Doong - Sunnyvale CA, US
Mengchang Doong - Sunnyvale CA, US
Assignee:
Microchip Technology Incorporated - Chandler AZ
International Classification:
H03M 1/66
US Classification:
341150, 341144, 341153, 341120, 341136
Abstract:
A digital-to-analog converter (DAC) uses thermometer coding over a certain code range. A switch array for the certain code range is implemented into a smaller area of the integrated circuit die so as to take advantage of the lower gradient inherent in the smaller area. By implementing the certain input code range into the smaller switch array area, further improved linearity in that input code range is achieved at the expense of worse linearity in the other input code ranges, but without increasing power consumption and/or chip-area of the integrated circuit die.
Analog-To-Digital Conversion Circuit
US Patent:
2009020, Aug 13, 2009
Filed:
Feb 8, 2008
Appl. No.:
12/028104
Inventors:
Honglei Wu - Sunnyvale CA, US
Assignee:
ZEROG WIRELESS, INC. - Sunnyvale CA
International Classification:
H03M 1/10
US Classification:
341120
Abstract:
An analog-to-digital conversion circuit and a method for calibrating an analog-to-digital conversion circuit are provided. A digital translation of an analog voltage is analyzed to determine a characteristic value of the analog voltage. A reference voltage, with which the digital translation is generated, is set to a value that is a minimum amount greater than the characteristic value. Additional embodiments include setting an offset voltage, with which the digital translation is also generated.
Buffer With Remote Cascode Topology
US Patent:
2010014, Jun 17, 2010
Filed:
Dec 15, 2008
Appl. No.:
12/335525
Inventors:
Stanley Bo-Ting Wang - Cupertino CA, US
Honglei Wu - Sunnyvale CA, US
Thomas Lee - Burlingame CA, US
Honglei Wu - Sunnyvale CA, US
Thomas Lee - Burlingame CA, US
Assignee:
ZEROG WIRELESS, INC. - Sunnyvale CA
International Classification:
H03K 3/00
US Classification:
327110, 327108, 327111
Abstract:
A buffer circuit is described for buffering signals between a circuit element and a load. The buffer includes a main transistor and a cascode transistor, as well as a distribution line for transferring signals over a distance between the circuit element and the load. The buffer is arranged in a remote cascode topology such that the cascode transistor is located substantially adjacent to the load and remote from the main transistor. The distribution line transfers signals over the distance from the main transistor to the cascode transistor. This remote cascode topology makes it possible to significantly reduce the power consumption of the buffer—as compared to conventional buffers—while maintaining the maximum bandwidth possible.