公开(公告)号：US20040214538A1

公开(公告)日：2004-10-28

申请号：US10421002

申请日：2003-04-22

Applicant: MOTOROLA, INC.

Inventor： Wayne Wiggins Ballantyne ,  Thomas Michael King

IPC: H04B001/00 ,  H04B007/00

CPC classification number: H03J1/0083 ,  H03J1/0033 ,  H03J1/0041 ,  H03J3/185 ,  H03J2200/02 ,  H03J2200/11

Abstract: A multiple channel receiver (200) includes a communications receiver synthesizer (204) and at least one numerically controlled oscillator (NCO) (406) that produce local oscillator signals that are derived from a common reference oscillator (202). A DSP (212) and CPU (214) perform automatic frequency control (AFC) by adjustment of the reference oscillator (202) based upon a signal received by a receive channel using the local oscillator signal produced by the communications receiver synthesizer (204). The CPU (214) also provides a synchronous indication of adjustments to the reference oscillator (202) to control circuitry for the at least one NCO (406) so that the configuration of the NCO (406) can be altered so as to maintain a substantially constant frequency output during the adjustment of the reference oscillator (202).

Abstract translation: 多通道接收器（200）包括通信接收机合成器（204）和产生从公共参考振荡器（202）导出的本地振荡器信号的至少一个数控振荡器（NCO）（406）。 DSP（212）和CPU（214）通过使用由通信接收机合成器（204）产生的本地振荡器信号由接收信道接收的信号来调整参考振荡器（202）来执行自动频率控制（AFC）。 CPU（214）还向参考振荡器（202）提供对于至少一个NCO（406）的控制电路的调整的同步指示，使得可以改变NCO（406）的配置，以便保持基本上 在调整参考振荡器（202）期间的恒定频率输出。