| 摘要 |
A method, using an AC-coupled filter, reduces DC offset in a downconverted signal in a wireless receiver receiving a signal including a preamble, the method including: changing the corner frequency of the AC-coupled filter a plurality of times during reception of the preamble. In another implementation, a receiver includes a DC offset correction system. The receiver includes a mixer downconverting a received signal to form a downconverted signal; a first AC-coupled high pass filter having an input in at least one-way data communication with the mixer, the first AC-coupled high pass filter having a switchable corner frequency dependent on a frame state of a received signal; and a plurality of second AC-coupled high pass filters coupled to an output of the first AC-coupled high pass filter, each of the plurality of second AC-coupled high pass filters have a switchable corner frequency. |
