Sang S Son

US Patent:

7167045, Jan 23, 2007

Filed:

Jun 7, 2004

Appl. No.:

10/861481

Inventors:

Sang Won Son - Sunnyvale CA, US
King Chun Tsai - Sunnyvale CA, US
Yuan-Ju Chao - Cupertino CA, US
Lawrence Tse - Fremont CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H03G 5/16
H03F 3/26

US Classification:

330130, 330133, 330254, 330256, 330272, 330279, 330285, 327306

Abstract:

A system for communicating information includes a variable gain amplifier (VGA) responsive to an input signal and a gain control signal for controlling a gain of the VGA. The system also includes a power amplifier responsive to the VGA. An output power level of the power amplifier is compared to a predetermined reference value to generate the gain control signal. The gain control signal is offset by a gain offset value. To change the output power level of the power amplifier from a first output power level to a second output power level, a first predetermined reference value and a first gain offset value associated with the first output power level are changed substantially concurrently to a second predetermined reference value and a second gain offset value, respectively, associated with the second output power level.

US Patent:

7173489, Feb 6, 2007

Filed:

Aug 25, 2003

Appl. No.:

10/648632

Inventors:

Yonghua Song - Saratoga CA, US
Sang Won Son - Sunnyvale CA, US

Assignee:

Marvell Semiconductor, Inc. - Hamilton

International Classification:

H03F 3/45

US Classification:

330254, 330278

Abstract:

A programmable gain voltage buffer circuit with a programmable gain may include transistors in parallel with resistors. The transistors may be used as variable resistors, with the resistors predominating the equivalent resistances at output points in different branches of the buffer circuit. The transistors may have resistances corresponding to programmable gain steps in the circuit.

US Patent:

7610022, Oct 27, 2009

Filed:

Mar 5, 2004

Appl. No.:

10/794563

Inventors:

King Chun Tsai - San Jose CA, US
Sang Won Son - Sunnyvale CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H04B 1/38

US Classification:

455 73, 4552321, 455307, 327552, 327556, 330303

Abstract:

Apparatus, systems, and methods implementing techniques for filtering signals are described. A filter circuit receives an input signal and produces a corresponding filtered signal. The filter circuit has a transfer function that relates the filtered signal to the input signal. The transfer function includes at least one pole and at least one zero, where at least one of the zeros corresponds to a first frequency, and at least one of the poles corresponds to a second frequency. The apparatus also includes a negative-transconductance circuit that is coupled to the filter circuit and that increases a magnitude of a component of the filtered signal that corresponds to the second frequency.

US Patent:

7738904, Jun 15, 2010

Filed:

May 19, 2006

Appl. No.:

11/437560

Inventors:

George Chien - Cupertino CA, US
King Chun Tsai - San Jose CA, US
Sang Won Son - Sunnyvale CA, US
Qiong Sun - Fremont CA, US
Leycheoh Lim - San Jose CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H04B 7/00

US Classification:

455522, 455 77

Abstract:

Systems and methods are provided for calibrating the control mechanism in a communication circuit to allow the communication circuit to maintain a desired output power level. The communication circuit includes a variable gain adjustment circuit and a power amplifier, which operate together to provide an output power level. A control circuit controls the variable gain adjustment circuit based on a default gain parameter, a high power threshold, and a low power threshold. A calibration circuit in the control circuit calibrates a default gain parameter to provide a desired output power. A power detector can detect the desired output power level to provide an output power measurement. The calibration circuit calibrates upper and lower power thresholds to provide an acceptable range of power variation around the output power measurement.

US Patent:

7761067, Jul 20, 2010

Filed:

Apr 21, 2004

Appl. No.:

10/830117

Inventors:

King Chun Tsai - San Jose CA, US
Sang Won Son - Sunnyvale CA, US
Wayne A. Loeb - San Francisco CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H01Q 11/12
H04B 1/04

US Classification:

4551272, 4551142, 4551153, 455 62, 455266, 455126, 455125

Abstract:

Apparatus, systems, and methods implementing techniques for calibrating a filter circuit. A comparator generates an output based on a filter output amplitude signal and a reference amplitude signal. A calibration logic unit receives the comparator output and produces a component code that is used by the filter circuit to adjust one or more component values.

US Patent:

7808322, Oct 5, 2010

Filed:

Jan 23, 2007

Appl. No.:

11/656576

Inventors:

Sang Won Son - Sunnyvale CA, US
King Chun Tsai - Sunnyvale CA, US
Yuan-Ju Chao - Cupertino CA, US
Lawrence Tse - Fremont CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H03F 3/18

US Classification:

330278, 330285, 330254, 330266, 330272, 330130

Abstract:

A system comprises a variable gain amplifier (VGA) that amplifies an input signal with a gain that is based on a gain control signal. A power amplifier receives an output of the VGA. Memory switches between at least two of N output power settings each including a predetermined reference value and a predetermined gain offset value. The memory substantially concurrently changes from the predetermined reference value and the predetermined gain offset value of a prior one of the N output power settings to the predetermined reference value and the predetermined gain offset value of a current one of the N output power settings, where N is an integer greater than one. A gain control adjuster adjusts the gain control signal based on an output of the power amplifier and the predetermined reference value and gain offset value of the current one of the N output power settings.

US Patent:

7856048, Dec 21, 2010

Filed:

Nov 19, 2007

Appl. No.:

11/942473

Inventors:

Lydi Smaini - St. Julien en Genevois, FR
Neric Fong - Sunnyvale CA, US
Sang Won Son - Sunnyvale CA, US
Bo Wang - Sunnyvale CA, US

Assignee:

Marvell International, Ltd. - Hamilton

International Classification:

H04B 1/38

US Classification:

375221, 375296, 375346, 375261, 375270, 455 47, 455109, 4551152, 455 6716, 4551143, 4551271, 455126, 455 6711, 330 2

Abstract:

The disclosure can provide methods and systems for autocalibrating a transceiver. The method can include upconverting a bandpass input signal by mixing the bandpass input signal with a first local oscillator signal to form an initial transmitter signal. The initial transmitter signal can be looped back to a receiver and downconverted with a second local oscillator signal having a frequency that is different from the first local oscillator to form an intermediate frequency signal. At least one of a gain and a phase of the transmitter can be adjusted based on a transmitter image sideband of the intermediate frequency signal to generate a calibrated transmitter signal having minimized transmitter image sideband.

US Patent:

7890132, Feb 15, 2011

Filed:

May 7, 2010

Appl. No.:

12/775694

Inventors:

George Chien - Cupertino CA, US
King Chun Tsai - San Jose CA, US
Sang Won Son - Sunnyvale CA, US
Alireza Shirvani Mahdavi - San Jose CA, US
Qiong Sun - Fremont CA, US
Leycheoh Lim - San Jose CA, US

Assignee:

Marvell International Ltd. - Hamilton

International Classification:

H04B 7/00

US Classification:

455522

Abstract:

Systems and methods are provided for calibrating the control mechanism in a communication circuit to allow the communication circuit to maintain a desired output power level. The communication circuit includes a variable gain adjustment circuit and a power amplifier, which operate together to provide an output power level. A control circuit controls the variable gain adjustment circuit based on a default gain parameter, a high power threshold, and a low power threshold. A calibration circuit in the control circuit calibrates a default gain parameter to provide a desired output power. A power detector can detect the desired output power level to provide an output power measurement. The calibration circuit calibrates upper and lower power thresholds to provide an acceptable range of power variation around the output power measurement.