公开(公告)号：US20160036486A1

公开(公告)日：2016-02-04

申请号：US14814197

申请日：2015-07-30

Applicant: Texas Instruments Incorporated

Inventor： Charles Kasimer Sestok, IV ,  Hunsoo Choo ,  Nikolaus Klemmer ,  Xiaoxi Zhang

IPC: H04B1/403 ,  H04L7/033 ,  H04B1/10

CPC classification number: H04B1/406 ,  H04B1/1027 ,  H04B1/403 ,  H04L7/0331

Abstract: A phase rotator corrects the IQ imbalance in a wireless transceiver. The phase rotator is a part of a compensation system that detects and separates reception impairment images from transmission impairment images. The disclosed phase rotator introduces a phase shift between the transmission channel and the reception channel without perturbing the phase mismatch and the gain mismatch in the reception path. The phase rotator includes a first local oscillation (LO) circuit that generates a first LO signal at a first carrier frequency and a second LO circuit that generates a second LO signal at a second carrier frequency that deviates from the first carrier frequency for a phase rotation period. The phase rotation period is sufficiently long such that the frequency deviation can introduce a prescribed phase shift between the first LO signal and the second LO signal.

Abstract translation: 相位旋转器校正无线收发器中的IQ不平衡。 相位旋转器是检测和分离接收损伤图像与传输损伤图像的补偿系统的一部分。 所公开的相位旋转器在传输信道和接收信道之间引入相移，而不会扰乱接收路径中的相位失配和增益失配。 相位旋转器包括以第一载波频率产生第一LO信号的第一本地振荡（LO）电路和产生第二载波频率的第二LO信号，该第二LO信号偏离第一载波频率用于相位旋转 期。 相位旋转周期足够长，使得频率偏差可以在第一LO信号和第二LO信号之间引入规定的相移。