公开(公告)号：HK1075548A1

公开(公告)日：2005-12-16

申请号：HK05106242

申请日：2005-07-22

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  BARGHOUTI IHAB

IPC: H04B20060101 ,  H04Q20060101

公开(公告)号：HK1063892A1

公开(公告)日：2005-01-14

申请号：HK04106566

申请日：2004-09-01

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  ABRISHAMKAR FARROKH ,  FEVRIER IAN ,  GLAZKO SERGUEI ,  LEE WAY-SHING ,  PATRICK CHRISTOPHER ,  SIH GIL

IPC: H04B20100101 ,  H04B7/26

Abstract: A spread spectrum wireless device (100) may include a receiver (110), a searcher (128), a search controller (130) and other features. The search controller (130) selectively generates control signals to control the searcher (128), which searches for a spread-spectrum signal. In one embodiment, the architecture of the searcher (128) is dynamically configurable by the search controller (130) to selectively search multiple channels using multiple frequency bins for the signal.

公开(公告)号：AU2003224784A1

公开(公告)日：2003-10-13

申请号：AU2003224784

申请日：2003-03-26

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  SINDHUSHAYANA NAGABHUSHANA ,  CHALLA RAGHU ,  SELTMANN KEVIN

IPC: H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04B1/16 ,  H04B1/40 ,  H04B1/38

Abstract: Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

公开(公告)号：CA2453168A1

公开(公告)日：2003-01-30

申请号：CA2453168

申请日：2002-07-16

Applicant: QUALCOMM INC

Inventor： CHALLA RAGHU ,  KASTURI NITIN ,  SCHLEGEL NIKOLAI

IPC: G06F1/00 ,  G06F1/03 ,  G06F7/52 ,  G06F7/556 ,  H03G3/20 ,  H03G3/30 ,  H04B1/16 ,  H04B1/707

Abstract: The invention is directed toward a digital VGA that is implemented in the logarithmic domain. The digital VGA exploits logarithmic properties to repla ce a complex multiplier of a conventional digital VGA with a simple and inexpensive adder. Moreover, additional techniques are described to significantly reduce the size of one or more lookup tables (LUTs) implemente d within the digital VGA. In this manner, the invention can realize a simple, low cost digital VGA.

公开(公告)号：CA2723058A1

公开(公告)日：2002-08-29

申请号：CA2723058

申请日：2002-02-15

Applicant: QUALCOMM INC

Inventor： LI TAO ,  HOLENSTEIN CHRISTIAN ,  KANG INYUP ,  WALKER BRETT C ,  PETERZELL PAUL E ,  CHALLA RAGHU ,  SEVERSON MATTHEW L ,  RAGHUPATHY ARUN ,  SIH GILBERT C

IPC: H03G1/00 ,  H04B1/30 ,  H03D9/00 ,  H03G3/20 ,  H03G3/30 ,  H04L25/06 ,  H04L27/22 ,  H04L27/38

Abstract: A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide gain control for the DVGA and RF/analog circuitry, and a serial bus interface (SBI) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode of the DC loop, since these two loops interact with one another. The duration of time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.

公开(公告)号：CA2438333A1

公开(公告)日：2002-08-29

申请号：CA2438333

申请日：2002-02-15

Applicant: QUALCOMM INC

Inventor： HOLENSTEIN CHRISTIAN ,  SEVERSON MATTHEW L ,  LI TAO ,  PETERZELL PAUL E ,  CHALLA RAGHU ,  WALKER BRETT C ,  KANG INJUP

IPC: H03G1/00 ,  H03G3/20 ,  H03G3/30 ,  H04L27/22 ,  H04L27/38 ,  H03F3/68

Abstract: A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide ga in control for the DVGA and RF/analog circuitry, and a serial bus interface (SB I) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode o f the DC loop, since these two loops interact with one another. The duration o f time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.

公开(公告)号：AT510351T

公开(公告)日：2011-06-15

申请号：AT02709570

申请日：2002-02-15

Applicant: QUALCOMM INC

Inventor： LI TAO ,  HOLENSTEIN CHRISTIAN ,  KANG INJUP ,  WALKER BRETT ,  PETERZELL PAUL ,  CHALLA RAGHU ,  SEVERSON MATTHEW ,  RAGHUPATHY ARUN ,  SIH GILBERT C

IPC: H03G1/00 ,  H03G3/30 ,  H03D3/00 ,  H03G3/20 ,  H04B1/40 ,  H04L27/22 ,  H04L27/38

Abstract: An apparatus and method in a wireless communication system, the apparatus comprising: first means for amplifying a received signal; means for cancelling a DC offset in the amplified signal; second means for digitally amplifying the DC offset cancelled signal; and means for measuring the digitally amplified signal and to control the gains of the first and second amplifying means.

公开(公告)号：AU2003224784C1

公开(公告)日：2009-01-22

申请号：AU2003224784

申请日：2003-03-26

Applicant: QUALCOMM INC

Inventor： SINDHUSHAYANA NAGABHUSHANA ,  SELTMANN KEVIN ,  BLACK PETER J ,  CHALLA RAGHU

IPC: H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04B1/16 ,  H04B1/40

Abstract: Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

公开(公告)号：AU2003224784B2

公开(公告)日：2008-06-19

申请号：AU2003224784

申请日：2003-03-26

Applicant: QUALCOMM INC

Inventor： SINDHUSHAYANA NAGABHUSHANA ,  SELTMANN KEVIN ,  BLACK PETER J ,  CHALLA RAGHU

IPC: H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04B1/16 ,  H04B1/40

Abstract: Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

公开(公告)号：AU2007234638A1

公开(公告)日：2007-12-13

申请号：AU2007234638

申请日：2007-11-23

Applicant: QUALCOMM INC

Inventor： PETERZELL PAUL E ,  SIH GILBERT C ,  CHALLA RAGHU ,  HOLENSTEIN CHRISTIAN ,  KANG INJUP ,  LI TAO ,  WALKER BRETT C ,  RAGHUPATHY ARUN ,  SEVERSON MATTHEW L

IPC: H03G1/00 ,  H03G3/20 ,  H03G3/30 ,  H04L27/22 ,  H04L27/38

Abstract: An apparatus and method in a wireless communication system, the apparatus comprising: first means for amplifying a received signal; means for cancelling a DC offset in the amplified signal; second means for digitally amplifying the DC offset cancelled signal; and means for measuring the digitally amplified signal and to control the gains of the first and second amplifying means.