Career records & work history
Lawyers & Attorneys
Xiaoyong Li - Lawyer
Licenses:
Washington - Active 1993
Xiaoyong Te Li, 482563 Greer Rd, Palo Alto, CA 94303
Xiaoyong Li Phones & Addresses
2563 Greer Rd, Palo Alto, CA 94303
San Jose, CA
Sunnyvale, CA
Santa Clara, CA
9085 Judicial Dr, San Diego, CA 92122 858-5877982
Carlsbad, CA
Los Banos, CA
Seattle, WA
6936 Chiala Ln, San Jose, CA 95129
Work
Position:
Professional/Technical
Education
Degree:
Graduate or professional degree
Ranks
Licence:
Washington - Active
Date:
1993
Mentions for Xiaoyong Te Li
Publications & IP owners
Us Patents
Receiver With Colpitts Differential Oscillator, Colpitts Quadrature Oscillator, And Common-Gate Low Noise Amplifier
US Patent:
7755442, Jul 13, 2010
Filed:
Aug 7, 2008
Appl. No.:
12/188135
Inventors:
Xiaoyong Li - San Diego CA, US
David J. Allstot - Seattle WA, US
David J. Allstot - Seattle WA, US
Assignee:
University of Washington - Seattle WA
International Classification:
H03B 5/08
US Classification:
331167, 331117 R, 331117 FE
Abstract:
Embodiments of the present invention include a common-gate amplifier having an input terminal and an output terminal, a transistor having a source, a drain, and a gate, four inductors, and two capacitors, and a negative amplification circuitry. The negative amplification circuitry has an input terminal to receive an RF signal. The negative amplification circuitry applies negative or zero amplification to the RF signal and outputs the negative or zero amplified signal on an output terminal. Alternative embodiments include a Colpitts differential oscillator, which includes two Colpitts single-ended oscillators. Each Colpitts single-ended oscillator includes a transistor. The source of the transistor in one Colpitts single-ended oscillator may be capacitively coupled to the gate of the transistor in the other Colpitts single-ended oscillator.
Common-Gate Common-Source Amplifier
US Patent:
7902923, Mar 8, 2011
Filed:
Mar 19, 2009
Appl. No.:
12/407704
Inventors:
Xiaoyong Li - Santa Clara CA, US
Rahul A. Apte - San Francisco CA, US
Rahul A. Apte - San Francisco CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H03F 3/68
US Classification:
330295, 330 69
Abstract:
Techniques for integrating a common-source and common-gate amplifier topology in a single amplifier design. In one aspect, an input voltage is provided to both a common-source amplifier and a common-gate amplifier. The output voltages of the common-source amplifier and the common-gate amplifier are provided to a difference block for generating a single-ended voltage proportional to the difference between the output voltages. When applied to the design of, e. g. , low-noise amplifiers (LNA's), the disclosed techniques may offer improved noise performance over the prior art.
Techniques For Improving Amplifier Linearity
US Patent:
7936220, May 3, 2011
Filed:
Dec 12, 2008
Appl. No.:
12/334306
Inventors:
Xiaoyong Li - Santa Clara CA, US
Sang-Oh Lee - Cupertino CA, US
Cormac S. Conroy - Campbell CA, US
Sang-Oh Lee - Cupertino CA, US
Cormac S. Conroy - Campbell CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H03F 3/04
US Classification:
330311, 330149
Abstract:
Techniques for improving the linearity of a cascode amplifier. In an exemplary embodiment, an auxiliary common-gate amplifier is provided in parallel with the principal cascode branch. The auxiliary common-gate amplifier samples a cascoded node in the principal cascode branch. The auxiliary common-gate amplifier generates a current which, when combined with the current generated by the principal cascode branch, cancels a distortion component to generate an output current with improved linearity characteristics. In an exemplary embodiment, a phase shifting network couples the cascoded node to the auxiliary common-gate amplifier, and may include, e. g. , a capacitor coupled to an inductor.
Wide Band Lna With Noise Canceling
US Patent:
8138835, Mar 20, 2012
Filed:
Jun 8, 2010
Appl. No.:
12/796593
Inventors:
Yi Zeng - Fremont CA, US
Xiaoyong Li - Santa Clara CA, US
Rahul A Apte - San Francisco CA, US
Xiaoyong Li - Santa Clara CA, US
Rahul A Apte - San Francisco CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H03F 3/04
US Classification:
330296, 330149, 330264
Abstract:
Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is characterized by a first node and a second node. The first amplifier converts a noise voltage at the first node into a first noise current at an output of the first amplifier. The second amplifier is directly coupled to the output of the first amplifier and provides noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node. The proposed techniques eliminate the need for large ac coupling capacitors and reduce the die size occupied by the LNA. The elimination of ac coupling capacitors between amplification stages of the LNA allows current reuse resulting in reduced current consumption.
Active Analog Filter Having A Mos Capacitor Device With Improved Linearity
US Patent:
8143941, Mar 27, 2012
Filed:
Nov 12, 2009
Appl. No.:
12/617428
Inventors:
Sunghyun Park - Gilroy CA, US
Xiaoyong Li - Santa Clara CA, US
Xiaoyong Li - Santa Clara CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H03K 5/00
US Classification:
327553, 327552
Abstract:
An active analog filter () having a MOS capacitor device () with improved linearity is proposed. In an exemplary embodiment, dc bias voltage sources () alter the capacitance of MOS varactors () connected in anti parallel so that the total capacitance of the MOS capacitor device remains constant or within a range over the voltage range of the filter and the filter linearity is set. In a further exemplary embodiment the output stage () of the operational amplifier circuit () of the active analog filter () is modified so that the dc bias voltage is provided by resistors () connected to a current source () already existing in the filter. Thus the linearity is set and the die area is significantly reduced.
Using Lo Shifting To Prevent A Local Transceiver From Interfering With An Fm Radio
US Patent:
8355752, Jan 15, 2013
Filed:
Nov 2, 2009
Appl. No.:
12/610600
Inventors:
Pushp Trikha - San Diego CA, US
Luca Blessent - Bridgewater NJ, US
Xiaoyong Li - Santa Clara CA, US
Rahul A. Apte - Santa Clara CA, US
Luca Blessent - Bridgewater NJ, US
Xiaoyong Li - Santa Clara CA, US
Rahul A. Apte - Santa Clara CA, US
Assignee:
QUALCOMM Incorporated - San Diego CA
International Classification:
H04M 1/00
H04B 1/16
H04B 7/00
H04B 1/10
H04B 1/16
H04B 7/00
H04B 1/10
US Classification:
4555561, 455208, 455257, 455296
Abstract:
A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.
Wide Band Lna With Noise Canceling
US Patent:
8373509, Feb 12, 2013
Filed:
Feb 9, 2012
Appl. No.:
13/370146
Inventors:
Yi Zeng - Fremont CA, US
Xiaoyong Li - Santa Clara CA, US
Rahul A Apte - San Francisco CA, US
Xiaoyong Li - Santa Clara CA, US
Rahul A Apte - San Francisco CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H03F 1/26
US Classification:
330310, 330296, 330 98
Abstract:
Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is characterized by a first node and a second node. The first amplifier converts a noise voltage at the first node into a first noise current at an output of the first amplifier. The second amplifier is directly coupled to the output of the first amplifier and provides noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node. The proposed techniques eliminate the need for large ac coupling capacitors and reduce the die size occupied by the LNA.
Receiver With Colpitts Differential Oscillator, Colpitts Quadrature Oscillator, And Common-Gate Low Noise Amplifier
US Patent:
2007017, Aug 2, 2007
Filed:
Jan 30, 2006
Appl. No.:
11/344549
Inventors:
Xiaoyong Li - San Diego CA, US
David Allstot - Seattle WA, US
David Allstot - Seattle WA, US
International Classification:
H03B 5/08
US Classification:
331167000
Abstract:
Embodiments of the present invention include a common-gate amplifier having an input terminal and an output terminal, a transistor having a source, a drain, and a gate, four inductors, and two capacitors, and a negative amplification circuitry. The negative amplification circuitry has an input terminal to receive an RF signal. The negative amplification circuitry applies negative or zero amplification to the RF signal and outputs the negative or zero amplified signal on an output terminal. Alternative embodiments include a Colpitts differential oscillator, which includes two Colpitts single-ended oscillators. Each Colpitts single-ended oscillator includes a transistor. The source of the transistor in one Colpitts single-ended oscillator may be capacitively coupled to the gate of the transistor in the other Colpitts single-ended oscillator.
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