Kim K Tran

US Patent:

6472860, Oct 29, 2002

Filed:

Mar 21, 2000

Appl. No.:

09/532062

Inventors:

Kim Anh Tran - Garland TX
Jukka-pekka Neitiniemi - Irving TX

Assignee:

Nokia Networks Oy - Espoo

International Classification:

G01R 1900

US Classification:

324 7611, 324537, 702 58

Abstract:

A compensated RF power detector utilized in power control circuits for preventing power amplifier saturation. A power amplifier uses a power control circuit to maintain the power amplifier as efficiently and linearly as possible without distortion. The operating point of the power amplifier is defined as close to the 1 dB gain compression point as possible for maximum efficiency and linearity with minimum distortion. However, extreme temperature conditions affect the 1 dB gain compression point causing the power amplifier to operate too close to saturation resulting in distortion or spectral growth. In an embodiment, the compensated RF power detector comprises a RF power detector and a variable RC circuit. The RF power detector has a RF input for receiving RF power, a detector output for supplying a compensated detected voltage and, a detecting diode for generating a detected voltage in response to the received RF power. The detecting diode has an anode coupled to the RF input and a cathode coupled to the detector output.

US Patent:

6731915, May 4, 2004

Filed:

Oct 31, 2000

Appl. No.:

09/703065

Inventors:

Kim Anh Tran - Garland TX

Assignee:

Nokia Corporation - Espoo

International Classification:

H04B 104

US Classification:

455126, 4551271, 4551141, 455 93, 330144

Abstract:

A Power Amplifier (PA) exhibits non-linear characteristics as a result of Amplitude Modulation-Phase Modulation (AM-PM) conversions resulting in intermodulation. Inter-modulation affects the RF signal spectrum at the output of the PA. The invention presents a method and apparatus for reducing intermodulation generated at the output of a PA as a result of AM-PM conversion. Presented is a RF power detector utilized in feedback control circuitry where the induction of odd-order harmonics into the feedback path acts to reduce AM-PM intermodulation at the output of the PA. The RF power detector comprises an detector input for receiving RF power and a detector output containing a pre-corrected detected voltage. The RF power detector comprises a pre-correcting circuit for generating odd-order harmonics at a specific power level. The pre-correcting circuit induces odd-order harmonics into the detected portion of output power allowing feedback control circuit to compensate for AM conversions. -PM.

US Patent:

6950859, Sep 27, 2005

Filed:

Dec 23, 2002

Appl. No.:

10/329102

Inventors:

David J. Bartek - Frisco TX, US
Yashodhara Devadiga - San Diego CA, US
Sarath Babu Govindarajulu - San Diego CA, US
Kim Phuong Tran - San Diego CA, US
Suresh Kumar Singamsetty - San Diego CA, US

Assignee:

Microtune (San Diego), Inc. - San Diego CA

International Classification:

G06F015/16
H04B001/69

US Classification:

709217, 709227, 375130

Abstract:

A method for emulating a physical connection using a wireless connection includes establishing a communication connection with a host controller according to a first communication protocol and establishing a wireless connection with a wireless device coupled to a peripheral. The method further includes receiving a wireless signal comprising registration information for the peripheral formatted according to a second communication protocol and communicating the registration information to the host controller using the communication connection. The communication of the registration information to the host controller allows the host controller to recognize the peripheral.

US Patent:

7136904, Nov 14, 2006

Filed:

Dec 23, 2002

Appl. No.:

10/329101

Inventors:

David J. Bartek - Frisco TX, US
Yashodhara Devadiga - San Diego CA, US
Sarath Babu Govindarajulu - San Diego CA, US
Kim Phuong Tran - San Diego CA, US
Suresh Kumar Singamsetty - San Diego CA, US

Assignee:

Microtine (San Diego), Inc. - San Diego CA

International Classification:

G06F 15/16

US Classification:

709217, 709227

Abstract:

A method for emulating a physical connection using a wireless connection includes establishing a communication connection with a peripheral according to a communication protocol using a host controller. The method further includes receiving a wireless signal carrying data having a format specified by the communication protocol, extracting the data from the wireless signal, and communicating the data to the peripheral using the communication connection.

US Patent:

62047272, Mar 20, 2001

Filed:

Sep 20, 1999

Appl. No.:

9/399562

Inventors:

Kim Anh Tran - Garland TX
Jukka-Pekka Neitiniemi - Irving TX

Assignee:

Nokia Telecommunications OY - Espoo

International Classification:

H03K 1922
H03K 2110

US Classification:

329370

Abstract:

A controlled detector circuit for generating a detector current to the input of a selected circuit. An unwanted operational voltage is generated on the input of the selected circuit affecting the precision of the detector circuit. The controlled detector circuit comprises a detector circuit having an RF input for detecting a RF signal and a detector output for providing the detector current. Operation of the detector circuit generates a voltage drop affecting the precision of the detector current. A control circuit having a control output connected to the detector output generates a control voltage for reducing the unwanted parameters affecting the precision of the detector current.

US Patent:

62659286, Jul 24, 2001

Filed:

Jul 16, 1999

Appl. No.:

9/354984

Inventors:

Kim Anh Tran - Garland TX
Jukka-Pekka Neitiniemi - Irving TX

Assignee:

Nokia Telecommunications OY - Espoo

International Classification:

G06F 7556

US Classification:

327350

Abstract:

A precision-controlled logarithmic amplifier having reduced interference parameters. In an embodiment, the invention comprises a logarithmic amplifier having an output signal providing a logarithmic representation of an input signal. A precision-control circuit is coupled to the logarithmic amplifier. The precision-control circuit produces a bias and a saturation current that act to reduce the effects of bias and saturation currents that are produced in the logarithmic amplifier and affect the output signal of the logarithmic amplifier.

US Patent:

62977091, Oct 2, 2001

Filed:

Jul 14, 1999

Appl. No.:

9/354356

Inventors:

Jukka-Pekka Neitiniemi - Irving TX
Kim A. Tran - Garland TX

Assignee:

Nokia Telecommunications Oy - Espoo

International Classification:

H01P 122
H03G 1102

US Classification:

333 171

Abstract:

A temperature compensated variable attenuator comprising a variable attenuator having at least one diode with temperature variations across the at least one diode producing a temperature offset signal. A bias source coupled to the variable attenuator supplies a biasing signal to the at least one diode through a temperature compensation source. The temperature compensation source is coupled between the bias source and the variable attenuator with the temperature compensation source comprising at least one diode capable of producing a temperature offset signal approximately equivalent to the temperature offset signal produced by the first at least one diode. The approximate temperature offset signal subtracted from the biasing signal produces a temperature compensated bias signal that is supplied to the variable attenuator.