-
公开(公告)号：DE60330707D1
公开(公告)日：2010-02-04
申请号：DE60330707
申请日：2003-11-12
Applicant: QUALCOMM INC
Inventor： BARNETT KENNETH , WALKER BRETT C , GARD KEVIN
Abstract: A radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control is provided. The RF driver amplifier system comprises a linear transconductor receiving an input voltage and providing a controlled current based on input voltage received, temperature compensation circuitry for varying current from the linear transconductor according to absolute temperature, an exponential current controller receiving current varied according to temperature and providing an exponential current in response, and an inductive degeneration compensator receiving exponential current and providing a control current to driver amplifier circuitry, thereby compensating for inductive degeneration due to at least one inductor in the driver amplifier circuitry. Control current passes from the inductive degeneration compensator to the driver amplifier circuitry. Output gain from the driver amplifier circuitry varies linearly in decibels with respect to the input voltage.
-
公开(公告)号：AT453244T
公开(公告)日：2010-01-15
申请号：AT03783406
申请日：2003-11-12
Applicant: QUALCOMM INC
Inventor： BARNETT KENNETH , WALKER BRETT C , GARD KEVIN
Abstract: A radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control is provided. The RF driver amplifier system comprises a linear transconductor receiving an input voltage and providing a controlled current based on input voltage received, temperature compensation circuitry for varying current from the linear transconductor according to absolute temperature, an exponential current controller receiving current varied according to temperature and providing an exponential current in response, and an inductive degeneration compensator receiving exponential current and providing a control current to driver amplifier circuitry, thereby compensating for inductive degeneration due to at least one inductor in the driver amplifier circuitry. Control current passes from the inductive degeneration compensator to the driver amplifier circuitry. Output gain from the driver amplifier circuitry varies linearly in decibels with respect to the input voltage.
-
公开(公告)号：RU2376704C2
公开(公告)日：2009-12-20
申请号：RU2004121685
申请日：2003-11-14
Applicant: QUALCOMM INC
Inventor： GARD KEVIN , SEGORIJA EHNTONI , SAKHOTA GURKANVAL KAMAL , PERSIKO CHARL Z
Abstract: Изобретениеотноситсяк электроннымсхемами можетиспользоватьсядляпрямогоповышающегопреобразованиячастоты. Достигаемыйтехническийрезультат - снижениевоздействияутечкигетеродинногосигналанавыходнойсигнал. Способповышающегопреобразованиячастотыв передатчикезаключаетсяв том, чтоформируютгетеродинныйсигналнаосновесигнала, управляемогонапряжениемгенератора (УНГ), настраиваютамплитудугетеродинногосигналанаосновеамплитудывыходногосигналанарадиочастоте (РЧ) ивыполняютпрямоеповышающеепреобразованиечастотывходногосигналав базовойполосес использованиемгетеродинногосигналапеременнойамплитуды. Устройствосодержитгетеродинныйгенератор, выполненныйс возможностьюприемасигналаУНТи формированиягетеродинныхсигналов, имеющихпеременнуюамплитудуи частоту, усилительс переменнымусилением, выполненныйс возможностьюнастройкиамплитудыгетеродинныхсигналов, иповышающийпреобразовательчастоты. 4 н. и 16 з.п. ф-лы, 8 ил.
-
公开(公告)号：BRPI0417707A
公开(公告)日：2007-03-20
申请号：BRPI0417707
申请日：2004-12-17
Applicant: QUALCOMM INC
Inventor： PERSICO CHARLES J , GARD KEVIN , SAHOTA GURKANWAL KAMAL , MIYAZAKI SHINICHI , CICCARELLI STEVEN C
Abstract: A low-power diversity receiver includes at least two receive paths, each of which is designated as a primary or secondary receive path. A primary receive path is compliant with system requirements (e.g., IS-98D requirements). A secondary receive path is not fully compliant with the system requirements and is designed for lower power, less area, and lower cost than the primary receive path. For a multi-antenna receiver, the two receive paths may be used to simultaneously process two received signals from two antennas. For a single-antenna receiver, either the primary or secondary receive path is selected, e.g., depending on whether or not large amplitude “jammers” are detected, to process a single input signal from one antenna. The receiver may include additional receive paths for additional frequency bands and/or GPS.
-
公开(公告)号：AU2003287661A1
公开(公告)日：2004-06-15
申请号：AU2003287661
申请日：2003-11-14
Applicant: QUALCOMM INC
Inventor： SEGORIA ANTHONY , SAHOTA GURKANWAL KAMAL , PERSICO CHARLES , GARD KEVIN
IPC: H04B1/30
Abstract: Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e.g., direction upconversion) of an input signal (e.g., at baseband) to obtain an output signal (e.g., at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level.
-
Patent Agency Ranking
公开(公告)号：CA2434048A1
公开(公告)日：2002-07-18
申请号：CA2434048
申请日：2002-01-10
Applicant: QUALCOMM INC
Inventor： SEE PUAY HOE ANDREW , DUNWORTH JEREMY D , SAHOTA KAMAL , MALDONADO DAVID , GARD KEVIN , PETERZELL PAUL E
Abstract: A system and method for generating a local oscillator (LO) frequency in a ze ro intermediate frequency (IF) receiver or transmitter is presented. A signal i s received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus , the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.
-
公开(公告)号：AT484888T
公开(公告)日：2010-10-15
申请号：AT03781962
申请日：2003-11-14
Applicant: QUALCOMM INC
Inventor： GARD KEVIN , SEGORIA ANTHONY , SAHOTA GURKANWAL , PERSICO CHARLES
IPC: H04B1/30
Abstract: Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e.g., direction upconversion) of an input signal (e.g., at baseband) to obtain an output signal (e.g., at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level.
-
公开(公告)号：DE60224162T2
公开(公告)日：2008-12-04
申请号：DE60224162
申请日：2002-01-10
Applicant: QUALCOMM INC
Inventor： PETERZELL PAUL E , MALDONADO DAVID , GARD KEVIN , SEE PUAY HOE ANDREW , DUNWORTH JEREMY D , SAHOTA KAMAL
Abstract: PROBLEM TO BE SOLVED: To provide local oscillator leakage control in direct conversion processes. SOLUTION: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications. COPYRIGHT: (C)2009,JPO&INPIT
-
公开(公告)号：DE60224162D1
公开(公告)日：2008-01-31
申请号：DE60224162
申请日：2002-01-10
Applicant: QUALCOMM INC
Inventor： PETERZELL PAUL E , MALDONADO DAVID , GARD KEVIN , SEE PUAY HOE ANDREW , DUNWORTH JEREMY D , SAHOTA KAMAL
Abstract: PROBLEM TO BE SOLVED: To provide local oscillator leakage control in direct conversion processes. SOLUTION: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications. COPYRIGHT: (C)2009,JPO&INPIT
-
公开(公告)号：AT376720T
公开(公告)日：2007-11-15
申请号：AT00976924
申请日：2000-11-03
Applicant: QUALCOMM INC
Inventor： GARD KEVIN , SAHOTA KAMAL , WALKER BRETT
Abstract: A device for use in a wireless communications system that reduces the amount of phase noise in the carrier signals due to powering down circuit elements for reducing power consumption. The device includes one or more carrier signal generators coupled to a transmitter. Each signal generator provides a respective carrier signal. The transmitter receives and modulates one or more carrier signals with one or more input signals to generate a modulated signal, which is gated on and off during a discontinnous data transmission. The transmitter includes one or more input buffers, with each input buffer receiving and buffering a respective carrier signal. The input buffers are maintained biased for the duration of the data transmission, even as the modulated signal is gated on and off, to provide a constant load for the signal generators and to isolate the carrier signal generators from switching noise. Some other active elements in the transmitter may be powered down when the modulated signal is gated off to further reduce power consumption.
-
-
-
-
-
-
-
-
-
Search Results
26
records
(took 0.023 seconds)
