公开(公告)号：US20140226768A1

公开(公告)日：2014-08-14

申请号：US14053815

申请日：2013-10-15

Applicant: PARKERVISION, INC.

Inventor： Gregory S. Rawlins ,  Kevin Brown ,  Michael W. Rawlins ,  David F. Sorrells

IPC: H03G3/20

CPC classification number: H03G3/20 ,  H04B1/30

Abstract: Methods and apparatuses for reducing DC offsets in a communication system are described. In a first aspect, a feedback loop circuit reduces DC offset in a wireless local area network (WLAN) receiver channel. The frequency response of the feedback loop circuit can be variable. In a second aspect, a circuit provides gain control in a WLAN receiver channel. The stored DC offset is subtracted from the receiver channel. First and second automatic gain control (AGC) amplifiers are coupled in respective portions of the receiver channel. In a third aspect, a feedback loop circuit reduces DC offset in a WLAN receiver channel. The feedback loop circuit includes a storage element that samples and stores receiver channel DC offset. The loop is opened, and the DC offset stored in the storage element is subtracted from the receiver channel. Circuits for monitoring DC offset, and for providing control signals for controlling the frequency response of the DC offset reducing circuits are also provided.

Abstract translation: 描述用于减少通信系统中的DC偏移的方法和装置。 在第一方面，反馈回路电路减少无线局域网（WLAN）接收机信道中的DC偏移。 反馈回路电路的频率响应是可变的。 在第二方面，电路在WLAN接收机信道中提供增益控制。 从接收机通道中减去存储的直流偏移。 第一和第二自动增益控制（AGC）放大器耦合在接收机通道的相应部分中。 在第三方面，反馈回路电路减少WLAN接收机信道中的DC偏移。 反馈回路电路包括采样和存储接收机通道DC偏移的存储元件。 打开该循环，并从接收器通道中减去存储在存储元件中的DC偏移。 还提供了用于监控DC偏移的电路，以及用于提供用于控制DC偏移减小电路的频率响应的控制信号。