Gang Liu

US Patent:

6486643, Nov 26, 2002

Filed:

Aug 27, 2001

Appl. No.:

09/813078

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Farmington Hills MI

International Classification:

G05F 159

US Classification:

323268, 323274, 323284

Abstract:

An H bridge regulating system for driving an electric load includes a linear output stage and switch mode output stage connected to opposite ends of the load. The linear output stage has a linear mode amplifier and a feedback circuit, and its amplifier generates a first output signal tied to one end of the load. This output voltage is passed through a conditioning resistor to an inverting input of the linear mode amplifier. The switch mode output stage has a switch mode amplifier and a feedback circuit, and its amplifier generates a second output signal tied to the other end of the load. Its voltage signal is passed through a second conditioning resistor to an inverting input of the switch mode amplifier. Other feedback circuit elements are also provided to create three distinct regions of operations for each of the amplifiers. Due to this novel arrangement for an H bridge circuit, and this novel method of operation involving three distinct regions of operation for the linear mode and switch mode output stages, very high power-saving energy efficiencies are achieved.

US Patent:

6636124, Oct 21, 2003

Filed:

Nov 30, 2001

Appl. No.:

10/000775

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Sunnyvale CA

International Classification:

H03K 708

US Classification:

332109, 327172

Abstract:

A pulse width modulation (PWM) circuit has a PWM output signal that features accurate timing even in the face of interference imposed upon the control signal representative of the desired PWM duty cycle. The PWM circuit includes or has a first or switching section and a second or analog section. The second section has an operational amplifier with a summing circuit that sums two input signals, namely a triangular wave signal and the control input signal, and then amplifies the summed signal to produce a trapezoidal waveform output delivered to the second section. The first section features a two-input comparator that produces a PWM signal output with a fast transition in response to trapezoidal output fed as an input and compared to a stable reference signal. Due to the speed of the op amp, timing errors on the PWM output signal due to interference on the control signal are minimized.

US Patent:

6801557, Oct 5, 2004

Filed:

Apr 6, 2001

Appl. No.:

09/827764

Inventors:

Gang Liu - Novi MI 48375

International Classification:

H01S 300

US Classification:

372 3809, 372 3802, 372 3803, 372 3804, 372 3807

Abstract:

A laser driver for laser sensing system having two lasers on a single PCB, thermo-electric temperature control, rapid activation, and pulse power and duration safety tables embedded in the microprocessor controller.

US Patent:

6984969, Jan 10, 2006

Filed:

Mar 19, 2004

Appl. No.:

10/805459

Inventors:

Gang Liu - Sunnyvale CA, US
Joseph C. Buxton - Palo Alto CA, US

Assignee:

Analog Devices, Inc. - Norwood MA

International Classification:

G05F 1/40

US Classification:

323286, 323280, 323284, 323303

Abstract:

A voltage regulator includes a linear mode regulator having a high pass filter circuit connected between its output and an output node, and a switch mode regulator having an low pass filter circuit connected between its output and the same output node. The high pass filter passes high frequency AC current provided by the linear mode regulator to the output node and reduces the low frequency AC and DC currents to substantially zero, and the low pass filter prevents the high frequency AC current produced by the linear mode regulator from being drawn by the switch mode regulator and passes the low AC and DC currents provided by the switch mode regulator to the output node. Thus, the present regulator offers the high response speed and low noise of a linear mode regulator, and the high power efficiency and large continuous output current capability of a switch mode regulator.

US Patent:

7283345, Oct 16, 2007

Filed:

Jul 14, 2004

Appl. No.:

10/891713

Inventors:

Gang Liu - Sunnyvale CA, US

International Classification:

H02H 9/00

US Classification:

361118, 361 35

Abstract:

A printed circuit board trace coupling system for providing high voltage isolation includes a driving circuit, a coupling transformer including a printed circuit board trace, and a receiving circuit.

US Patent:

8050643, Nov 1, 2011

Filed:

May 9, 2008

Appl. No.:

12/118357

Inventors:

Songping Wu - Sunnyvale CA, US
Hua Qian - Fremont CA, US
Gang Liu - Fremont CA, US
King Chun Tsai - San Jose CA, US
Lawrence Tse - Fremont CA, US
Hui-Ling Lou - Sunnyvale CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H04B 7/00

US Classification:

4552341, 455254

Abstract:

In a method and system for controlling gain in an RF receiver, an RF signal is analyzed over different attack and decay windows, from which the receiver determines (1) if the signal is in an attack condition with dip values below a threshold level thus indicating a need for increasing signal gain, or (2) if the signal is in a decay condition with threshold values above a threshold level thus indicating a need for decreasing signal gain. The receiver applies attack and decay windows of different sizes and in an asynchronous manner to create a gain control scheme that is insensitive to transient effects such as channel interference and deep fading that affect the intensities of an in-band signal.

US Patent:

8149397, Apr 3, 2012

Filed:

Mar 14, 2006

Appl. No.:

11/886390

Inventors:

Luke P. Lee - Orinda CA, US
Yu Lu - Riverside CA, US
Gang L. Liu - Berkeley CA, US
Jaeyoun Kim - Ames IA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G01J 3/44

US Classification:

356301

Abstract:

The disclosure relates to metallic nanophotonic crescent structures, or “nanocrescent SERS probes,” that enhance detectable signals to facilitate molecular detections. More particularly, the nanocrescent SERS probes of the disclosure possess specialized geometries, including an edge surrounding the opening that is capable of enhancing local electromagnetic fields. Nanosystems utilizing such structures are particularly useful in the medical field for detecting rare molecular targets, biomolecular cellular imaging, and in molecular medicine.

US Patent:

8361932, Jan 29, 2013

Filed:

May 2, 2007

Appl. No.:

12/299284

Inventors:

Gang L. Liu - Berkeley CA, US
Jonathan A. Ellman - Oakland CA, US
Luke P. Lee - Orinda CA, US
Fanqing Frank Chen - Moraga CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

C40B 30/04
C40B 40/10
G01N 33/573

US Classification:

506 9, 435 74, 506 18

Abstract:

This invention pertains to the in vitro detection of proteases using a single peptide-conjugate nanocrescent surface enhanced Raman scattering (SERS) probes with at least nanomolar sensitivity. The probe enables detection of proteolytic activity in extremely small volume and at low concentration. In certain embodiments the probes comprise an indicator for the detection of an active protease, where the indicator comprises a nanocrescent attached to a peptide, where said peptide comprises a recognition site for the protease and a Raman tag attached to the peptide.