公开(公告)号：US06631273B1

公开(公告)日：2003-10-07

申请号：US09392825

申请日：2000-01-31

申请人： Glenn William Eswein ,  Daniel James Curran ,  Graham Stuart Hamilton ,  James Francis Reardon ,  John Francis O'Connor

发明人： Glenn William Eswein ,  Daniel James Curran ,  Graham Stuart Hamilton ,  James Francis Reardon ,  John Francis O'Connor

IPC分类号： H04Q720

CPC分类号： H03J5/244

摘要： Modern portable communications units, and in particular cellular telephones, can contain several frequency bands for receiving and several frequency bands for transmitting signals. Typically these units contain a baseband unit and a frequency synthesizer unit, which may be embodied as VLSI integrated circuits. The baseband unit commonly contains the user interfaces and control signals for controlling other portions of the circuitry. The second unit is sometimes called a frequency synthesizer unit. The second unit is dedicated to producing frequencies that are used by the communications system to create RF signals for broadcast and also to take RF signals and extract the modulated signal from them for decoding. As personal communications units have begun using an increasing number of bands it is often necessary to configure different filters to receive or broadcast the different bands. Typically, the baseband Integrated Circuit or separate circuitry does this filter configuration management. The data for filter switching, however, can be decoded from the data that is communicated across the serial bus to the frequency synthesizer integrated circuit. By allowing the frequency synthesizer Integrated Circuit to control the filtering as well as the frequency synthesizer functions, integrated circuit pins can be eliminated from the baseband integrated circuit. In addition, timing and latency problems involved with commanding the frequency change over a serial bus and switching filters directly are eliminated.

摘要翻译： 现代便携式通信单元，特别是蜂窝电话可以包含用于接收的几个频带和用于发送信号的几个频带。 通常，这些单元包含基带单元和频率合成器单元，其可以被实现为VLSI集成电路。 基带单元通常包含用于控制电路的其它部分的用户界面和控制信号。 第二单元有时称为频率合成器单元。 第二单元专用于产生由通信系统用于创建用于广播的RF信号的频率，并且还采取RF信号并从其中提取调制信号以进行解码。 随着个人通信单元已经开始使用越来越多的频带，通常需要配置不同的滤波器来接收或广播不同的频带。 通常，基带集成电路或单独的电路执行此过滤器配置管理。 然而，用于滤波器切换的数据可以从通过串行总线传送到频率合成器集成电路的数据被解码。 通过允许频率合成器集成电路来控制滤波以及频率合成器功能，可以从基带集成电路中消除集成电路引脚。 此外，消除了通过串行总线和切换滤波器直接指挥频率变化所涉及的定时和延迟问题。