公开(公告)号：AT514234T

公开(公告)日：2011-07-15

申请号：AT09175722

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：DE602007004724D1

公开(公告)日：2010-03-25

申请号：DE602007004724

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：CA2663936A1

公开(公告)日：2006-03-30

申请号：CA2663936

申请日：2005-09-16

Applicant: QUALCOMM INC

Inventor： GUDEM PRASAD ,  SAHOTA GURKANWAL KAMAL

IPC: H03F3/16 ,  H03F1/32 ,  H03F3/45 ,  H03H11/04

Abstract: A transconductance cell is disclosed. The transconductance cell may be singl e- ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistor s connected in series with each of the field effect transistors having a gate configured to receive a tuning voltage.

公开(公告)号：CA2580234A1

公开(公告)日：2006-03-30

申请号：CA2580234

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：CA2577206A1

公开(公告)日：2006-03-30

申请号：CA2577206

申请日：2005-08-17

Applicant: QUALCOMM INC

Inventor： GUDEM PRASAD ,  GAZZERRO PETER C

IPC: H03H11/12

Abstract: An active filter with compensation to reduce Q-enhancement is disclosed. The filter may include a first amplifier (202a) and a second amplifier (202b) coupled to the first amplifier. The second amplifier having a negative feedback loop including a buffer (702) having a plurality of compensation resistors (RC2) and a capacitor (C2). The compensation resistors each have a value that results in the biquad filter having substantially zero Q-enhancement. The biquads are cascaded to form higher order filters.

公开(公告)号：WO2007134201A3

公开(公告)日：2008-01-10

申请号：PCT/US2007068724

申请日：2007-05-11

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

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

IPC: H04B1/10

CPC classification number: H04B1/109

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.

Abstract translation: 描述了用于控制接收机中的控制环路的操作的技术。 结合操作状态的改变来修改至少一个控制回路的操作，其可以对应于线性状态，增益状态，操作频率，天线配置等的改变。线性状态的变化可能发生在干扰器 并且可能导致模拟电路块的偏置电流被调整。 要修改的至少一个控制环路可以包括DC环路，AGC环路等。可以通过在改变操作状态之前禁用控制环路或改变其时间常数来修改控制环路的操作，等待预定量 的时间以允许接收机安定，并且在等待预定时间量之后启用控制环路或恢复其时间常数。

公开(公告)号：WO2006033735A3

公开(公告)日：2006-05-18

申请号：PCT/US2005029456

申请日：2005-08-17

Applicant: QUALCOMM INC ,  GUDEM PRASAD ,  GAZZERRO PETER C

Inventor： GUDEM PRASAD ,  GAZZERRO PETER C

IPC: H03H11/12

CPC classification number: H03H11/1252 ,  H03H11/1234

Abstract: An active filter with compensation to reduce Q-enhancement is disclosed. The filter may include a first amplifier (202a) and a second amplifier (202b) coupled to the first amplifier. The second amplifier having a negative feedback loop including a buffer (702) having a plurality of compensation resistors (RC2) and a capacitor (C2). The compensation resistors may each have a value that results in the biquad filter having substantially zero Q-enhancement. The biquads may cascaded to form higher order filters.

Abstract translation: 公开了一种具有补偿以降低Q增强的有源滤波器。 滤波器可以包括耦合到第一放大器的第一放大器（202a）和第二放大器（202b）。 第二放大器具有负反馈回路，包括具有多个补偿电阻器（RC2）和电容器（C2）的缓冲器（702）。 补偿电阻器可以各自具有导致双二阶滤波器具有基本为零Q增强的值。 双层可以级联以形成更高阶的滤波器。

公开(公告)号：WO2006034174A3

公开(公告)日：2006-07-27

申请号：PCT/US2005033445

申请日：2005-09-16

Applicant: QUALCOMM INC ,  GUDEM PRASAD ,  SAHOTA GURKANWAL KAMAL

Inventor： GUDEM PRASAD ,  SAHOTA GURKANWAL KAMAL

IPC: H03F3/45

CPC classification number: H03F3/45085 ,  H03F1/3211 ,  H03F3/45179 ,  H03F2203/45352 ,  H03F2203/45384 ,  H03F2203/45392

Abstract: A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistors connected in series with each of the field effect transistors having a gate configured to receive a tuning voltage.

Abstract translation: 公开了一种跨导电池。 跨导单元可以是单端或差分。 跨导单元可以包括可调变性电路。 可调谐退化电路可以具有与具有配置为接收调谐电压的栅极的每个场效应晶体管串联连接的多个场效应晶体管。

公开(公告)号：WO2007109776A2

公开(公告)日：2007-09-27

申请号：PCT/US2007064724

申请日：2007-03-22

Applicant: QUALCOMM INC ,  DENG JUNXIONG ,  GUDEM PRASAD

Inventor： DENG JUNXIONG ,  GUDEM PRASAD

IPC: H03F1/02

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

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.

Abstract translation: 蜂窝电话的RF输出功率放大器（PA）包括第一和第二AB类放大器电路。 如果蜂窝电话要在高功率操作模式下工作，则第一放大器驱动PA输出端。 第一放大器中的功率晶体管被偏置在第一直流电流和第一直流电压上，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工作，则第二放大器驱动输出端。 第二放大器中的功率晶体管被以第二直流电流和第二直流电压偏置，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。