AGC for slicer-based low power demodulator
First Claim
Patent Images
1. An apparatus for wireless communications, comprising:
- an amplifier;
an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; and
a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period;
wherein the automatic gain control is further configured to;
process the samples;
compare the processed samples to a threshold; and
determine the gain for the amplifier based on the comparison; and
further wherein each of the samples output from the slicer comprises a first or second value, the automatic gain control being further configured to;
compare a percentage of samples having the first value to a threshold percentage during the time period; and
determine the gain for the amplifier based on the comparison.
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Abstract
An apparatus and method for performing automatic gain control in a receiver are disclosed. The apparatus may include an amplifier, and the gain control may be based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier.
148 Citations
32 Claims
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1. An apparatus for wireless communications, comprising:
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an amplifier; an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; and a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period; wherein the automatic gain control is further configured to; process the samples; compare the processed samples to a threshold; and determine the gain for the amplifier based on the comparison; and further wherein each of the samples output from the slicer comprises a first or second value, the automatic gain control being further configured to; compare a percentage of samples having the first value to a threshold percentage during the time period; and determine the gain for the amplifier based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for wireless communications, comprising:
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an amplifier; an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; and a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period, wherein the slicer is further configured to sample the output from the amplifier based on a threshold, and wherein the automatic gain control is further configured to determine the threshold for the slicer from the samples during the time period. - View Dependent Claims (10)
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11. An apparatus for wireless communications, comprising:
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means for amplifying a target signal; means for automatically controlling a gain for the amplifying means based on an output from the amplifying means during a time period in which the target signal is not present at the output of the amplifying means; and means for sampling the output from the amplifying means, wherein the means for automatically controlling a gain for the amplifying means further comprises means for determining the gain for the amplifying means from the samples during the time period; wherein the means for automatically controlling a gain of the amplifying means further comprises; means for processing the samples output from the sampling means; means for comparing the processed samples to a threshold; and means for determining the gain for the amplifier based on the comparison; and further wherein each of the samples output from the sampling means comprises a first or second value, the means for automatically controlling a gain of the amplifying means further comprising; means for comparing a percentage of samples having the first value to a threshold percentage during the time period; and means for determining the gain for the amplifying means based on the comparison. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for wireless communications, comprising:
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means for amplifying a target signal; means for automatically controlling a gain for the amplifying means based on an output from the amplifying means during a time period in which the target signal is not present at the output of the amplifying means; and means for sampling the output from the amplifying means, wherein the means for automatically controlling a gain for the amplifying means further comprises means for determining the gain for the amplifying means from the samples during the time period; wherein the sampling means is configured to sample the outputs from the amplifying means based on a threshold, the apparatus further comprising means for determining the threshold for the sampling means from the samples output from the sampling means during the time period. - View Dependent Claims (21)
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22. A method of automatic gain control, comprising:
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amplifying a target signal with an amplifier; automatically controlling a gain for the amplifier based on an output from the amplifier means during a time period in which the target signal is not present at the output of the amplifier and sampling the output from the amplifier, wherein the automatic control of the gain further comprises determining the gain for the amplifier from the samples during the time period; wherein the automatic control of the gain further comprises; processing the samples; comparing the processed samples to a threshold; and determining the gain for the amplifier based on the comparison; and further wherein each of the samples comprises a first or second value, the automatic control of the gain further comprises; comparing a percentage of samples having the first value to a threshold percentage during the time period; and determining the gain for the amplifier based on the comparison. - View Dependent Claims (23, 24, 25, 26)
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27. A method of automatic gain control, comprising:
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amplifying a target signal with an amplifier; automatically controlling a gain for the amplifier based on an output from the amplifier means during a time period in which the target signal is not present at the output of the amplifier; and sampling the output from the amplifier, wherein the automatic control of the gain further comprises determining the gain for the amplifier from the samples during the time period; wherein the sampling of the output from the amplifier is based on a threshold, and wherein the automatic control of the gain further comprises determining the threshold during the time period. - View Dependent Claims (28)
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29. A computer-program product for automatically controlling a gain of an amplifier, comprising:
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a non-transitory computer-readable medium encoded with codes executable to; amplify a target signal with an amplifier; automatically control a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; and sample the output from the amplifier, wherein the automatic control of the gain comprises determining the gain for the amplifier from the samples during the time period; wherein the automatic control of the gain further comprises; processing the samples; comparing the processed samples to a threshold; and determining the gain for the amplifier based on the comparison; and further wherein each of the samples comprises a first or second value, and the automatic control of the gain further comprises; comparing a percentage of samples having the first value to a threshold percentage during the time period; and determining the gain for the amplifier based on the comparison.
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30. A headset, comprising:
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an amplifier; an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period; wherein the automatic gain control is further configured to; process the samples; compare the processed samples to a threshold; and determine the gain for the amplifier based on the comparison; and further wherein each of the samples output from the slicer comprises a first or second value, the automatic gain control being further configured to; compare a percentage of samples having the first value to a threshold percentage during the time period; and determine the gain for the amplifier based on the comparison; and a transducer configured to generate sound based on the target signal.
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31. A watch, comprising:
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an amplifier; an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period; wherein the automatic gain control is further configured to; process the samples; compare the processed samples to a threshold; and determine the gain for the amplifier based on the comparison; and further wherein each of the samples output from the slicer comprises a first or second value, the automatic gain control being further configured to; compare a percentage of samples having the first value to a threshold percentage during the time period; and determine the gain for the amplifier based on the comparison; and a user interface configured to provide an indication based on the target signal.
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32. A sensing device, comprising:
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an amplifier; an automatic gain control configured to determine a gain for the amplifier based on an output from the amplifier during a time period in which a target signal is not present at the output of the amplifier; a slicer configured to sample the output from the amplifier, wherein the automatic gain control is further configured to determine the gain for the amplifier from the samples during the time period; wherein the automatic gain control is further configured to; process the samples; compare the processed samples to a threshold; and determine the gain for the amplifier based on the comparison; and further wherein each of the samples output from the slicer comprises a first or second value, the automatic gain control being further configured to; compare a percentage of samples having the first value to a threshold percentage during the time period; and determine the gain for the amplifier based on the comparison; and a sensor configured to generate data based on the target signal.
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Specification