-
1.发明申请公开(公告)号：US20010036816A1
公开(公告)日：2001-11-01
申请号：US09753123
申请日：2000-12-29
IPC分类号： H04B001/00
CPC分类号： H03F1/0272 , H03F3/1935 , H03F2200/294 , H03F2200/372 , H03F2203/7239 , H04B1/109
摘要： A radio frequency receiver includes an amplifier and a detector that produces a bias control signal indicating the level of the signal environment in which the receiver is currently operating. A bias generator sets the bias level of the amplifier according to the bias control signal, where the bias level tends to increase as the signal level increases. Other circuits within the early stages or front end of a radio frequency receiver can also have such reactively adjusted bias levels. These include buffers for local intermediate frequency oscillators and radio frequency to intermediate frequency mixers or converters. The invention can be used to increase the range of linearity (and thus the intermodulation immunity) of RF amplification stages. It can also be used to reduce typical power consumption by reducing the bias level under typical conditions and relying on the bias control to increase bias levels under adverse signal conditions. The invention can be particularly advantageous for applications where power is at a premium and the receiver, or at least its front end, must operate while the device is in standby mode. Such applications include mobile, portable and hand held pagers and wireless telephones and Internet connections. If standby mode operation in non-maximum signal environments dominates the usage of the receiver, then the invention can substantially increase battery life.
摘要翻译： 射频接收机包括放大器和检测器，其产生指示接收机当前正在操作的信号环境的电平的偏置控制信号。 偏置发生器根据偏置控制信号设置放大器的偏置电平，其中偏置电平随信号电平增加而趋于增加。 无线电频率接收机的早期或前端内的其他电路也可以具有这样的反应性调整的偏置电平。 这些包括用于本地中频振荡器和射频到中频混频器或转换器的缓冲器。 本发明可用于增加RF放大级的线性范围（从而增加互调抗扰度）。 它也可以用于通过在典型条件下降低偏置电平来降低典型功耗，并依靠偏置控制来增加不利信号条件下的偏置电平。 本发明对于功率非常大的应用而言尤其有利，并且接收器或至少其前端必须在器件处于待机模式时工作。 这样的应用包括移动，便携式和手持寻呼机以及无线电话和因特网连接。 如果在非最大信号环境中的待机模式操作主导了接收机的使用，则本发明可以显着延长电池寿命。
搜索结果
1 条记录 (耗时 0.015 秒)