2011 to Sep 2012 Chinese Language TeacherThe Derryfield School
Sep 2007 to Jun 2010 Chinese Language and Culture TeacherUniversity of Massachusetts
Jan 2007 to May 2007 Chinese Language TeacherXian Jiao-tong University
Sep 2003 to Jul 2004 Visiting Assistant /Associate ProfessorSuffield Academy
Sep 1999 to Aug 2003 Chinese Language and Culture TeacherXian Jiao-tong University
Dec 1979 to Sep 1988 College English Lecturer
Education:
University of Massachusetts Sep 1991 to May 1998 Ed. D. in Multicultural EducationUniversity of Massachusetts Sep 1989 to May 1991 M.A. in ESLUniversity of Massachusetts Oct 1988 to Sep 1989 MA in EducationXian Jiao-tong University Sep 1986 to Jul 1987 EnglishShaanxi Teachers' University Dec 1976 to Dec 1979 B.A. in English
Lebanon VA Medical Center Surgical Clinic 1700 S Lincoln Ave, Lebanon, PA 17042 7172726621 (phone), 7172286118 (fax)
Education:
Medical School Sun Yat Sen Univ of Med Sci, Guangzhou, China (242 21 Pr 1/71) Graduated: 1982
Procedures:
Bone Marrow Biopsy Chemotherapy
Conditions:
Anemia Iron Deficiency Anemia Non-Hodgkin's Lymphoma Breast Neoplasm, Malignant Hemolytic Anemia
Languages:
English
Description:
Dr. Liu graduated from the Sun Yat Sen Univ of Med Sci, Guangzhou, China (242 21 Pr 1/71) in 1982. He works in Lebanon, PA and specializes in Hematology/Oncology and Internal Medicine. Dr. Liu is affiliated with Lebanon VA Medical Center.
Garfield Health Center 210 N Garfield Ave STE 203, Monterey Park, CA 91754 6263077397 (phone), 6263071807 (fax)
Education:
Medical School Hunan Med Univ, Changsha City, Hunan, China Graduated: 1985
Languages:
Chinese English Spanish Vietnamese
Description:
Dr. Liu graduated from the Hunan Med Univ, Changsha City, Hunan, China in 1985. She works in Monterey Park, CA and specializes in Internal Medicine. Dr. Liu is affiliated with Garfield Medical Center and Pacific Alliance Medical Center.
Li Liu - Littleton MA, US Christopher C. Souchuns - Ashland MA, US Ping Li - Dunstable MA, US Gregory N. Henderson - Sudbury MA, US
Assignee:
TriQuint Semiconductor, Inc. - Hillsboro OR
International Classification:
H03G 3/20
US Classification:
330133, 330140
Abstract:
A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector is coupled to an interior node of the amplifier along the signal path, and is operable to sample a first signal being transmitted on the signal path. The power detector outputs a second signal reflective of a power of the first signal. In one embodiment, the interior node is in a matching network of the amplifier disposed between a first amplifier stage and a final amplifier stage of the amplifier. The second signal may be used in a feedback network to adjust an amount of amplification of the first signal by the amplifier.
Wireless Communications Device Including Power Detector Circuit Coupled To Sample Signal At Interior Node Of Amplifier
A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector is coupled to an interior node of the amplifier along the signal path, and is operable to sample a first signal being transmitted on the signal path. The power detector outputs a second signal reflective of a power of the first signal. In one embodiment, the interior node is in a matching network of the amplifier disposed between a first amplifier stage and a final amplifier stage of the amplifier. The second signal may be used in a feedback network to adjust an amount of amplification of the first signal by the amplifier.
Continuous Bias Circuit And Method For An Amplifier
Gregory Henderson - Sudbury MA, US Christopher Souchuns - Ashland MA, US Li Liu - Littleton MA, US Ping Li - Dunstable MA, US On San Andy Tang - Merrimack NH, US Ashley Imhoff - Boxford MA, US
Assignee:
TriQuint Semiconductor, Inc.
International Classification:
H03G003/10
US Classification:
330/285000
Abstract:
An amplifier and a bias circuit are disclosed. The bias circuit receives an analog voltage signal that reflects a desired output power level of the amplifier. The bias circuit causes the amplifier to draw a quiescent current, from a fixed-level DC voltage supply, that varies proportionally with the analog voltage signal. In this way, the current consumption of the amplifier is optimized for the desired output power level, while maintaining a desired, high degree of linearity. The amplifier and bias circuit may be in a wireless communications device that includes a baseband processor. The baseband processor generates the analog voltage signal, and a data signal that is converted to a RF signal. The RF signal is amplified by a preamplifier to a power level determined by the analog voltage signal. The RF signal is output to the amplifier for further amplification, and subsequently is broadcast through an antenna.
Gregory Henderson - Sudbury MA, US Christopher Souchuns - Ashland MA, US Li Liu - Littleton MA, US Ping Li - Dunstable MA, US On San Andy Tang - Merrimack NH, US Ashley Imhoff - Boxford MA, US
Assignee:
TriQuint Semiconductor, Inc.
International Classification:
H04B001/16
US Classification:
455/341000
Abstract:
An automatic-bias amplifier circuit includes an amplifier having an input, an output, and a signal path between the input and output. A power detector is coupled for sampling the power of a signal passed on the signal path. The point of coupling may be the output and/or at one or more internal nodes of the amplifier. The power detector outputs an analog voltage signal reflective of the power of the signal to a bias circuit. The bias circuit causes the amplifier to draw a quiescent current, from a fixed level DC power supply, that varies in proportion to the analog voltage signal. Accordingly, the power consumption of the amplifier is optimized for all output power levels of the amplifier, while maintaining a desired degree of linearity. The automatic-bias amplifier circuit may be used in a wireless radio frequency communications device, e.g., a cellular phone.