DC offset correcting in a direct conversion or very low IF receiver
First Claim
1. A method for DC offset correction in a direct conversion or very low intermediate frequency (VLIF) receiver, the method comprises:
- prior to receiving a burst of data;
determining a coarse DC offset with an antenna of the receiver off;
adjusting an analog portion of the receiver based on the coarse DC offset;
determining gain setting of the receiver with the antenna on;
setting gain of at least one gain stage of the receiver based on the gain setting;
determining a fine DC offset with the antenna off; and
while receiving the burst of data, subtracting the fine DC offset from a digital baseband signal or digital low IF signal.
6 Assignments
0 Petitions
Accused Products
Abstract
A direct conversion or VLIF receiver corrects DC offset by, prior to receiving a burst of data, the receiver determines a coarse DC offset with the antenna of the receiver switched off. The receiver then adjusts an analog portion of the receiver (e.g., the output of the mixers) based on the coarse DC offset. The receiver then determines a gain setting of the receiver (e.g., for the low noise amplifier and/or programmable gain amplifiers) with the antenna on. The receiver then sets the gain of at least one gain stage of the receiver based on the gain setting. The receiver then determines a fine DC offset with the antenna off. The receiver then, while receiving a burst of data, subtracts the fine DC offset from the digital baseband or low IF signal prior to data recovery.
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Citations
26 Claims
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1. A method for DC offset correction in a direct conversion or very low intermediate frequency (VLIF) receiver, the method comprises:
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prior to receiving a burst of data; determining a coarse DC offset with an antenna of the receiver off; adjusting an analog portion of the receiver based on the coarse DC offset; determining gain setting of the receiver with the antenna on; setting gain of at least one gain stage of the receiver based on the gain setting; determining a fine DC offset with the antenna off; and while receiving the burst of data, subtracting the fine DC offset from a digital baseband signal or digital low IF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for DC offset correction in a direct conversion or very low intermediate frequency (VLIF) receiver, the method comprises:
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determining a coarse analog DC offset by; disabling an antenna coupled to the receiver; sampling an analog DC offset of an analog portion of the receiver; and holding the analog DC offset as the coarse analog DC offset; adjusting the analog portion of the receiver based on the coarse analog DC offset; determining a gain setting for at least one gain stage of the receiver with the antenna enabled; adjusting gain of the at least one gain stage based on the gain setting; determining a fine digital DC offset; and adjusting a digital portion of the receiver based on the fine digital DC offset. - View Dependent Claims (11, 12, 13)
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14. A receiver comprises:
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processing module; and memory operably coupled to the processing module, wherein the memory includes operational instructions that cause the processing module to; prior to receiving a burst of data; determine a coarse DC offset with an antenna of the receiver off; adjust an analog portion of the receiver based on the coarse DC offset; determine gain setting of the receiver with the antenna on; set gain of at least one gain stage of the receiver based on the gain setting; determine a fine DC offset with the antenna off; and while receiving the burst of data, subtract the fine DC offset from a digital baseband signal or a digital low IF signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A receiver comprises:
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processing module; and memory operably coupled to the processing module, wherein the memory includes operational instructions that cause the processing module to; determine a coarse analog DC offset by; disabling an antenna coupled to the receiver; sampling analog DC offset of an analog portion of the receiver; and holding the analog DC offset as the coarse analog DC offset; adjust the analog portion of the receiver based on the coarse analog DC offset; determine a gain setting for at least one gain stage of the receiver; adjust gain of the at least one gain stage based on the gain setting; determine a fine digital DC offset; and adjust a digital portion of the receiver based on the fine digital DC offset. - View Dependent Claims (24, 25, 26)
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Specification