公开(公告)号：EP0917297A2

公开(公告)日：1999-05-19

申请号：EP98660123.5

申请日：1998-11-12

申请人： NOKIA MOBILE PHONES LTD.

发明人： Lehtinen, Kari ,  Hietala, Seppo ,  Numminen, Jussi

IPC分类号： H04B1/40

CPC分类号： H04B1/0071 ,  H04B1/0082

摘要： A radio transceiver (400, 450) is intended for transmission and reception of radio signals in two frequency bands, and it comprises a first signal input (101) for receiving radio signals in the first frequency band, and a second signal input (102) for receiving radio signals in the second frequency band. In addition, it comprises

a first mixer connected to the first signal input (101) for mixing the radio signals (DCS RX) in the first frequency band onto a predetermined first intermediate frequency (IF1);
a second mixer (404) for mixing the first intermediate frequency (IF1) onto a predetermined second intermediate frequency (IF2); and
a third mixer (402, 461) connected to the second signal input (102) for mixing the radio signals (GSM RX) in the second frequency band onto a predetermined frequency (IF2), which is substantially the same as the second intermediate frequency.

摘要翻译： 无线电收发器（400,450）旨在用于在两个频带中发送和接收无线电信号，并且其包括用于接收第一频带中的无线电信号的第一信号输入（101）和第二信号输入（102） 用于在第二频带中接收无线电信号。 另外，它包括连接到第一信号输入（101）的第一混频器，用于将第一频带中的无线信号（DCS RX）混合到预定的第一中频（IF1）上; 用于将第一中频（IF1）混合到预定的第二中频（IF2）上的第二混频器（404）; 以及连接到第二信号输入端（102）的第三混频器（402,461），用于将第二频带中的无线电信号（GSM RX）混合到与第二中频基本相同的预定频率（IF2）上 。