公开(公告)号：EP2316162B1

公开(公告)日：2013-04-10

申请号：EP09791103.6

申请日：2009-08-03

申请人： QUALCOMM Incorporated

发明人： ASURI, Bhushan, Shanti

IPC分类号： H03D7/14 ,  H03D7/16

CPC分类号： H03D7/166 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/165 ,  H03D2200/0084

公开(公告)号：EP2815510B1

公开(公告)日：2018-03-28

申请号：EP13708552.8

申请日：2013-02-13

申请人： Qualcomm Incorporated

发明人： ASURI, Bhushan, Shanti ,  PATEL, Shrenik

IPC分类号： H04B1/04

CPC分类号： H04L25/08 ,  H04B1/0475

摘要： An apparatus for reducing spurs is described. The apparatus includes a coarse digital to analog converter (DAC). The apparatus also includes a correction term generator. The correction term generator generates a correction term. The correction term has an amplitude within a dynamic range of the coarse digital to analog converter (DAC). The apparatus also includes a baseband filter. The correction term is selected such that the baseband filter reduces the correction term to an amplitude approximating that of a spur in a transmit signal. The correction term is used to reduce a spur.

公开(公告)号：EP2815510A1

公开(公告)日：2014-12-24

申请号：EP13708552.8

申请日：2013-02-13

申请人： Qualcomm Incorporated

发明人： ASURI, Bhushan, Shanti ,  PATEL, Shrenik

IPC分类号： H04B1/04

CPC分类号： H04L25/08 ,  H04B1/0475

摘要： An apparatus for reducing spurs is described. The apparatus includes a coarse digital to analog converter (DAC). The apparatus also includes a correction term generator. The correction term generator generates a correction term. The correction term has an amplitude within a dynamic range of the coarse digital to analog converter (DAC). The apparatus also includes a baseband filter. The correction term is selected such that the baseband filter reduces the correction term to an amplitude approximating that of a spur in a transmit signal. The correction term is used to reduce a spur.

公开(公告)号：EP2316162A2

公开(公告)日：2011-05-04

申请号：EP09791103.6

申请日：2009-08-03

申请人： QUALCOMM Incorporated

发明人： ASURI, Bhushan, Shanti

IPC分类号： H03D7/14 ,  H03D7/16

CPC分类号： H03D7/166 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/165 ,  H03D2200/0084

摘要： An upconverter and a downconverter having good performance are described. In one design, the upconverter includes first, second, and third sets of transistors. The first set of transistors receives baseband signals and provides an upconverted signal. The second set of transistors switches the transconductance of the transistors in the first set based on transmit (TX) local oscillator (LO) signals. The third set of transistors enables and disables the transistors in the second set based on a TX VCO signal. In one design, the downconverter includes first, second, and third sets of transistors. The first set of transistors receives a modulated signal and provides baseband signals. The second set of transistors switches the transconductance of the transistors in the first set based on receive (RX) LO signals. The third set of transistors enables and disables the transistors in the second set based on an RX VCO signal.