公开(公告)号：US20150180529A1

公开(公告)日：2015-06-25

申请号：US14638463

申请日：2015-03-04

Applicant: Renesas Electronics Corporation

Inventor： Satoru TOMISAWA ,  Hiroaki MATSUI ,  Kazuaki HORI ,  Tetsuya WAKUDA ,  Sungwoo CHA

IPC: H04B1/40 ,  H04B17/00

CPC classification number: H04B1/40 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D2200/0043 ,  H04B17/00 ,  H04B17/11 ,  H04B17/15 ,  H04B17/17 ,  H04B17/21

Abstract: There is a need to reduce secondary intermodulation distortion that may occur in a reception circuit of a high-frequency signal processor and a wireless communication system having the same. In test mode, for example, a test signal generating circuit TSGEN generates a test signal RFtst at f_tx±0.5 MHz. The test signal RFtst is input to a mixer circuit MIXrx_I (MIXrx_Q). A correction circuit block CALBK detects an IM2 component resulting from the MIXrx_I (MIXrx_Q). The CALBK varies a differential balance for the MIXrx_I (MIXrx_Q) and concurrently monitors a phase for the IM2 component resulting from MIXrx_I (MIXrx_Q). The CALBK searches for the differential balance corresponding to a transition point that allows the phase to transition by approximately 180°. The MIXrx_I (MIXrx_Q) operates in normal mode using the differential balance as a search result.

Abstract translation: 需要减少可能在高频信号处理器的接收电路和具有该二次互调失真的无线通信系统中发生的二次互调失真。 在测试模式下，例如，测试信号产生电路TSGEN产生f_tx±0.5MHz的测试信号RFtst。 测试信号RFtst被输入到混频器电路MIXrx_I（MIXrx_Q）。 校正电路块CALBK检测由MIXrx_I（MIXrx_Q）产生的IM2分量。 CALBK改变MIXrx_I（MIXrx_Q）的差分平衡，同时监视由MIXrx_I（MIXrx_Q）产生的IM2分量的相位。 CALBK搜索对应于允许相位转换约180°的转换点的差分平衡。 使用差分天平作为搜索结果，MIXrx_I（MIXrx_Q）在正常模式下运行。