公开(公告)号：EP1704640A1

公开(公告)日：2006-09-27

申请号：EP05711536.2

申请日：2005-01-14

申请人： Qualcomm, Incorporated

发明人： RAGHUPATHY, Arun ,  SEE, Puay Hoe ,  SAHOTA, Gurkanwal Kamal ,  REEVES, Robert ,  PETERZELL, Paul, E.

IPC分类号： H03F1/32 ,  H03G3/30

CPC分类号： H03F1/3247 ,  H03F1/0222 ,  H03F1/3282 ,  H03F2201/3233 ,  H03G3/3047

摘要： Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amplifier characteristics can be stored in distinct look up tables (526, 712). Alternatively, the inverse of the amplifier characteristics can be stored in distinct look up tables. Signals that are to be amplified are characterized in polar format having a phase component with a normalized magnitude and a magnitude component. The phase component can be predistorted by applying the inverse of the PM distortion characteristics to the signal. Similarly, the magnitude component can be predistorted by applying the inverse of the AM distortion characteristics to the signal. The predistorted phase component can be amplified using the previously characterized amplifier. The predistorted magnitude component can be used to set the gain of the previously characterized amplifier.

公开(公告)号：EP1790074B1

公开(公告)日：2010-10-20

申请号：EP05796291.2

申请日：2005-09-16

申请人： QUALCOMM INCORPORATED

发明人： GUDEM, Prasad ,  SAHOTA, Gurkanwal Kamal

IPC分类号： H03F3/45

CPC分类号： H03F3/45085 ,  H03F1/3211 ,  H03F3/45179 ,  H03F2203/45352 ,  H03F2203/45384 ,  H03F2203/45392

摘要： 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.

公开(公告)号：EP2038997A2

公开(公告)日：2009-03-25

申请号：EP07840385.4

申请日：2007-07-10

申请人： QUALCOMM Incorporated

发明人： ZHUO, Wei ,  HADJICHRISTOS, Aristotele ,  SAHOTA, Gurkanwal Kamal ,  PENG, Solti

IPC分类号： H03D7/16

CPC分类号： H03D7/166 ,  H03H19/008 ,  H03H2007/0192

摘要： A method according to one embodiment includes using a quadrature set of local oscillator signals having duty cycles of substantially less than fifty percent to perform a mixing operation on a radio-frequency current signal. Other embodiments include using a quadrature set of local oscillator signals having duty cycles of less than twenty-five percent.

摘要翻译： 根据一个实施例的方法包括使用占空比基本上小于百分之五十的本地振荡器信号的正交组来对射频电流信号执行混频操作。 其他实施例包括使用占空比小于百分之二十五的本地振荡器信号的正交组。

公开(公告)号：EP1790074A2

公开(公告)日：2007-05-30

申请号：EP05796291.2

申请日：2005-09-16

申请人： QUALCOMM INCORPORATED

发明人： GUDEM, Prasad ,  SAHOTA, Gurkanwal Kamal

IPC分类号： H03F3/45

CPC分类号： H03F3/45085 ,  H03F1/3211 ,  H03F3/45179 ,  H03F2203/45352 ,  H03F2203/45384 ,  H03F2203/45392

摘要： 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.