Dynamic AC-Coupled DC Offset Correction
First Claim
1. A method, using an AC-coupled filter, of reducing DC offset in a downconverted signal in a wireless receiver receiving a signal including a preamble, the method comprising:
- changing the corner frequency of the AC-coupled filter a plurality of times during reception of the preamble.
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Abstract
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.
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Citations
9 Claims
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1. A method, using an AC-coupled filter, of reducing DC offset in a downconverted signal in a wireless receiver receiving a signal including a preamble, the method comprising:
changing the corner frequency of the AC-coupled filter a plurality of times during reception of the preamble. - View Dependent Claims (2, 3, 4, 5)
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6. A receiver including a DC offset correction system, comprising:
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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 20 having a switchable corner frequency dependent on the frame state of the received signal. - View Dependent Claims (7, 8)
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9. A method for correcting DC offset in a wireless receiver, the method comprising:
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high pass filtering a downconverted signal to substantially reduce signal components below a first frequency during a first time period; high pass filtering the downconverted signal to substantially reduce signal components below a second frequency during a second time period; and high pass filtering the downconverted signal to substantially reduce signal components below a third frequency during a third time period.
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Specification