公开(公告)号：EP0617532A1

公开(公告)日：1994-09-28

申请号：EP94302041.2

申请日：1994-03-22

申请人： NOKIA MOBILE PHONES LTD.

发明人： Tiittanen, Erkki ,  Mattila, Heikki ,  Rautava, Tapio ,  Matero, Jorma ,  Ostman, Kjell ,  Halttunen, Mikko

IPC分类号： H04L27/20

CPC分类号： H04L27/364 ,  H03C3/406 ,  H04B1/0475 ,  H04L27/2071

摘要： Method and system, for calibrating a vector modulator that does not require a network analyzer, are disclosed which are incorporated in a vector modulation system comprising a standard vector modulator circuit including means for shifting phase to adjust the relative phases of the I and Q components of the modulated RF carrier. Means for attenuating are included in the I and Q modulation system to adjust the relative amplitude of the modulation signals. The disclosure describes a technique wherein the microwave transmitter's I and Q phase difference is measured by measuring the power levels of selected frequencies of the RF output signal. The power levels are compared and a correction value is stored in a read-only memory to compensate for the error. More particularly, the error compensation is achieved by first determining amplitude error or unbalance by I and Q signal power measurement and an amplitude compensation signal is stored, then a power measurement is carried out for phase compensation and a phase compensation signal is stored.

摘要翻译： 公开了用于校准不需要网络分析器的矢量调制器的方法和系统，其被并入矢量调制系统中，该矢量调制系统包括标准矢量调制器电路，包括用于移相的装置，以调整I和Q分量的相对相位 调制的RF载波。 在I和Q调制系统中包括用于衰减的装置，以调整调制信号的相对幅度。 本公开描述了一种技术，其中通过测量RF输出信号的选定频率的功率电平来测量微波发射器的I和Q相位差。 功率电平进行比较，校正值存储在只读存储器中以补偿误差。 更具体地，通过首先通过I和Q信号功率测量来确定振幅误差或不平衡来存储误差补偿，并且存储幅度补偿信号，然后执行功率测量以进行相位补偿，并且存储相位补偿信号。