公开(公告)号：JP2011205662A

公开(公告)日：2011-10-13

申请号：JP2011104579

申请日：2011-05-09

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： DENG JUNXIONG ,  GUDEM PRASAD

IPC: H03F1/02

CPC classification number: H03F1/0277 ,  H03F1/0283 ,  H03F2200/294 ,  H03F2200/372

Abstract: PROBLEM TO BE SOLVED: To provide a power amplifier including appropriate power efficiency and linearity corresponding to different output power modes.SOLUTION: An RF output power amplifier 8 of a cellular telephone includes first and second Class-AB amplifier circuits 109, 110. If the cellular telephone is to operate in a high power operating mode, then the first amplifier 109 drives a PA output terminal 117. The power transistor(s) 121 in the first amplifier 109 is/are biased at a first DC current and a first DC voltage so as to optimize efficiency and linearity at high output powers. If the cellular telephone is to operate in a low power operating mode, then the second amplifier 110 drives the output terminal 117. The power transistor(s) 124, 125 in the second amplifier 110 is/are biased at a second DC current and a second DC voltage so as to optimize efficiency and linearity at low output powers.

Abstract translation: 要解决的问题：提供一种包括与不同输出功率模式对应的适当功率效率和线性度的功率放大器。解决方案：蜂窝电话的RF输出功率放大器8包括第一和第二AB类放大器电路109,110。如果 蜂窝电话将以高功率操作模式操作，则第一放大器109驱动PA输出端117.第一放大器109中的功率晶体管121被偏置在第一直流电流和第一直流电压 以便在高输出功率下优化效率和线性度。 如果蜂窝电话要在低功率操作模式下操作，则第二放大器110驱动输出端117.第二放大器110中的功率晶体管124,125被偏置在第二DC电流和 第二直流电压，以便在低输出功率下优化效率和线性度。

公开(公告)号：JP2013102490A

公开(公告)日：2013-05-23

申请号：JP2012286987

申请日：2012-12-28

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： DENG JUNXIONG ,  GUDEM PRASAD

IPC: H03F1/02 ,  H03F3/24 ,  H03F3/68

CPC classification number: H03F1/0277 ,  H03F1/0283 ,  H03F2200/294 ,  H03F2200/372

Abstract: PROBLEM TO BE SOLVED: To provide power amplifiers in cellular telephones which can improve average power efficiency (APE).SOLUTION: An RF output power amplifier (PA) includes first and second Class AB amplifier circuits. In operation in a high power operating mode, the first amplifier drives a PA output terminal. The power transistor(s) in the first amplifier is/are biased so as to optimize efficiency and linearity at high output power. In operation in a low power operating mode, then the second amplifier drives the output terminal. The power transistor(s) in the second amplifier is/are biased so as to optimize efficiency and linearity at low output powers. By sizing the power transistors in the amplifiers appropriately, emitter current densities are kept substantially equal so that PA power gain is the same in the two operating modes.

Abstract translation: 要解决的问题：提供可以提高平均功率效率（APE）的蜂窝电话中的功率放大器。 解决方案：RF输出功率放大器（PA）包括第一和第二AB类放大器电路。 在大功率工作模式下，第一放大器驱动PA输出端。 第一放大器中的功率晶体管被偏置，以便在高输出功率下优化效率和线性度。 在低功耗工作模式下工作时，第二放大器驱动输出端子。 第二放大器中的功率晶体管被偏置，以便在低输出功率下优化效率和线性度。 通过适当地调整放大器中的功率晶体管的尺寸，发射极电流密度保持基本相等，使PA功率增益在两种工作模式下相同。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：DE602005024284D1

公开(公告)日：2010-12-02

申请号：DE602005024284

申请日：2005-09-16

Applicant: QUALCOMM INC

Inventor： GUDEM PRASAD ,  SAHOTA GURKANWAL KAMAL

IPC: H03F3/45

公开(公告)号：AT497654T

公开(公告)日：2011-02-15

申请号：AT08830496

申请日：2008-09-10

Applicant: QUALCOMM INC

Inventor： CABANILLAS JOSE ,  GUDEM PRASAD ,  KWOK SAI ,  LOVE DAVID

IPC: H04B1/52

Abstract: Techniques for attenuating undesired signal components from a differential duplexer are described. The duplexer provides a differential received signal at RX+ and RX− ports. This differential received signal includes an undesired common mode signal, which may come from a transmit signal. The common mode signal is attenuated with a common mode trap in an impedance matching network coupled to the RX+ and RX− ports. The matching network includes a first passive circuit coupled between the RX+ port and a first node, a second passive circuit coupled between the RX− port and a second node, and the common mode trap coupled between the first and second nodes. In one design, the common mode trap includes a first inductor coupled between the first node and a common node, a second inductor coupled between the second node and the common node, and a capacitor coupled between the common node and circuit ground.

公开(公告)号：AT485625T

公开(公告)日：2010-11-15

申请号：AT05796291

申请日：2005-09-16

Applicant: QUALCOMM INC

Inventor： GUDEM PRASAD ,  SAHOTA GURKANWAL KAMAL

IPC: H03F3/45

Abstract: A transconductance cell comprising a tunable degeneration circuit having a plurality of field effect transistors connected in series, each of the field effect transistors having a gate configured to receive a tuning voltage, wherein the tunable degeneration circuit further comprises a tapped voltage divider network configured to apply the tuning voltage to each of the field effect transistors through a different one of the taps, wherein each of said one or more resistors has a value that results in a differential voltage between each adjacent pair of the taps when the tuning voltage is applied to the tapped voltage divider network, the differential voltage being equal to the quiescent drain-to-source voltage of one of the field effect transistors.

公开(公告)号：ES2668400T3

公开(公告)日：2018-05-17

申请号：ES09791629

申请日：2009-08-18

Applicant: QUALCOMM INC

Inventor： LIU LI ,  GUDEM PRASAD

IPC: H03F1/56 ,  H03F3/45

Abstract: Un aparato que comprende: un amplificador de bajo ruido (LNA) (130, 130a, 130b) configurado para recibir una señal de entrada de LNA y proporcionar al menos una señal de salida de LNA; y múltiples pares de mezcladores (440, 442, 450, 452, 640, 642, 650, 652) acoplados al LNA, cada par de los múltiples pares de mezcladores tiene una impedancia de entrada de mezclador diferente, en el que cada par de mezcladores está configurado para reducir en frecuencia una de al menos una señal de salida de LNA cuando esté activada, estando cada par de mezcladores activados o desactivados selectivamente; en el que los múltiples pares de mezcladores (440, 442, 450, 452, 640, 642, 650, 652) comprenden un primer par de mezcladores activados y desactivados por una corriente y/o voltaje de polarización en fase y por un segundo par de mezcladores activados y desactivados por una corriente y/o voltaje de polarización en fase de cuadratura; en el que los múltiples pares de mezcladores (440, 442, 450, 452, 640, 642, 650, 652) están configurados para activarse y desactivarse selectivamente para: funcionar en un modo de alta linealidad y obtener una impedancia baja de mezclador para el LNA (130, 130a, 130b); o funcionar en un modo de baja linealidad y obtener una alta impedancia del mezclador para el LNA 25 (130, 130a, 130b).

公开(公告)号：AT528851T

公开(公告)日：2011-10-15

申请号：AT07759195

申请日：2007-03-22

Applicant: QUALCOMM INC

Inventor： DENG JUNXIONG ,  GUDEM PRASAD

IPC: H03F1/02

Abstract: An RF output power amplifier (PA) of a cellular telephone includes first and second Class AB amplifier circuits. If the cellular telephone is to operate in a high power operating mode, then the first amplifier drives the PA output terminal. The power transistor(s) in the first amplifier is/are biased at a first DC current and a first DC voltage so as to optimize efficiency and linearity at high output powers. If the cellular telephone is to operate in a low power operating mode, then the second amplifier drives the output terminal. The power transistor(s) in the second amplifier is/are biased at a second DC current and a second DC voltage so as to optimize efficiency and linearity at low output powers. By sizing the power transistors in the amplifiers appropriately, emitter current densities are maintained substantially equal so that PA power gain is the same in the two operating modes.

公开(公告)号：ES2360690T3

公开(公告)日：2011-06-08

申请号：ES08830496

申请日：2008-09-10

Applicant: QUALCOMM INC

Inventor： CABANILLAS JOSE ,  GUDEM PRASAD ,  KWOK SAI ,  LOVE DAVID

IPC: H04B1/52

Abstract: Un aparato (122) que comprende: un primer componente (424a, 624a, 724a) de circuito acoplado entre un primer nodo (A) y un nodo común (C); un segundo componente (424b, 624b, 724b) de circuito acoplado entre un segundo nodo (B) y el nodo común (C); un tercer componente (426, 626, 726) de circuito acoplado entre el nodo común (C) y un circuito de descarga a tierra, proporcionando los componentes de circuito primero, segundo y tercero un trayecto de baja impedancia a través del nodo común para una señal en modalidad común recibida en los nodos (A, B) primero y segundo desde puertos de recepción diferenciales de un duplexador (112).

公开(公告)号：AT457553T

公开(公告)日：2010-02-15

申请号：AT07762111

申请日：2007-05-11

Applicant: QUALCOMM INC

Inventor： CICCARELLI STEVEN C ,  BANISTER BRIAN CLARKE ,  GEORGE BRIAN ,  LAU SOON-SENG ,  GUDEM PRASAD ,  RAGHUPATHY ARUN

IPC: H04B1/10

Abstract: Techniques for controlling operation of control loops in a receiver are described. The operation of at least one control loop is modified in conjunction with a change in operating state, which may correspond to a change in linearity state, gain state, operating frequency, antenna configuration, etc. A change in linearity state may occur when jammers are detected and may cause bias current of analog circuit blocks to be adjusted. The at least one control loop to be modified may include a DC loop, an AGC loop, etc. The operation of a control loop may be modified by disabling the control loop or changing its time constant prior to changing operating state, waiting a predetermined amount of time to allow the receiver to settle, and enabling the control loop or restoring its time constant after waiting the predetermined amount of time.

公开(公告)号：RU2376701C2

公开(公告)日：2009-12-20

申请号：RU2007109795

申请日：2005-08-17

Applicant: QUALCOMM INC

Inventor： GUDEM PRASAD ,  GADZERRO PITER K

IPC: H03H11/12

Abstract: Изобретениеотноситсяк областиэлектроники, вчастностик активнымфильтрамс компенсациейдлясниженияувеличениязначениядобротности. Техническийрезультат - низкоеувеличениедобротностив диапазонеизмененийпроцесса, напряженияи температуры. Фильтр (фиг.2) можетвключатьв себяпервыйусилитель (202а) ивторойусилитель (202b), соединенныйс первымусилителем. Второйусилительимеетцепьотрицательнойобратнойсвязи, включающуюв себя (фиг.7) буфер (702), имеющиймножествокомпенсационныхрезисторов (RC2) иконденсатор (С2). Каждыйизкомпенсационныхрезисторовможетиметьноминал, которыйприводитк тому, чтобиквадратныйфильтримеетпосуществунулевоеувеличениезначениядобротности. Биквадымогутбытьвключеныкаскаднодляполученияфильтровболеевысокогопорядка. 5 н. и 18 з.п. ф-лы, 17 ил.