Signal-characteristic determined digital-to-analog converter (DAC) filter stage configuration
First Claim
1. A reconfigurable signal processing circuit for processing an input signal, comprising:
- a detector for generating a measure of at least one of an amplitude or a frequency of the input signal;
a plurality of digital processing stages connected in cascade for processing the input signal, wherein the plurality of processing stages have differing output sample rates while operational; and
a power management block for receiving the measure generated by the detector and determining particular ones of the plurality of digital signal processing stages that are placed in a low-power non-operational state in conformity with the measure of amplitude or frequency, whereby in at least one operating mode, when the measure indicates that the amplitude of the input signal or the frequency of the input signal is below a threshold value, at least one but not all of the plurality of digital signal processing stages is placed in the low-power non-operational state, and wherein when the measure indicates that the amplitude of the input signal or the frequency of the input signal is above the threshold value, the at least one digital signal processing stage is placed in an operational state to provide a higher performance from the plurality of digital signal processing stages.
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Abstract
A digital signal processing circuit, such as a digital-to-analog converter (DAC) having multiple cascaded processing stages, some of which are selectably placed in a low-power non-operating state according to a lower-power operating mode of the digital signal processing circuit and are placed in an operating state according to another higher-performance operating mode of the circuit. The output sample rates of the stages differ, so that the sample rate through the cascade changes. A signal characteristic determination block generates an indication of one or both of an amplitude and/or frequency of the input signal, so that the operating mode of the digital signal processing circuit is selected in conformity with the indication of amplitude and/or frequency of the input signal.
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Citations
20 Claims
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1. A reconfigurable signal processing circuit for processing an input signal, comprising:
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a detector for generating a measure of at least one of an amplitude or a frequency of the input signal; a plurality of digital processing stages connected in cascade for processing the input signal, wherein the plurality of processing stages have differing output sample rates while operational; and a power management block for receiving the measure generated by the detector and determining particular ones of the plurality of digital signal processing stages that are placed in a low-power non-operational state in conformity with the measure of amplitude or frequency, whereby in at least one operating mode, when the measure indicates that the amplitude of the input signal or the frequency of the input signal is below a threshold value, at least one but not all of the plurality of digital signal processing stages is placed in the low-power non-operational state, and wherein when the measure indicates that the amplitude of the input signal or the frequency of the input signal is above the threshold value, the at least one digital signal processing stage is placed in an operational state to provide a higher performance from the plurality of digital signal processing stages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of processing an input signal, comprising:
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generating a measure of at least one of an amplitude or a frequency of the input signal; operating a plurality of digital signal processing stages connected in cascade for processing the input signal at differing output sample rates; and power managing the plurality of digital signal processing stages in conformity with the measure generated by generating by determining particular ones of the plurality of digital signal processing stages to be placed in a low-power non-operational state, whereby in at least one operating mode, when the measure indicates that the amplitude of the input signal or the frequency of the input signal is below a threshold value, at least one but not all of the plurality of digital signal processing stages is placed in the low-power non-operational state, and wherein when the measure indicates that the amplitude of the input signal or the frequency of the input signal is above the threshold value, the at least one digital signal processing stage is placed in an operational state to provide a higher performance from the plurality of digital signal processing stages. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An integrated circuit, comprising:
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a detector for generating a measure of at least one of an amplitude or a frequency of an input signal; a plurality of digital processing stages connected in cascade for processing the input signal, wherein the plurality of processing stages have differing output sample rates while operational; and a power management block for receiving the measure generated by the detector and determining particular ones of the plurality of digital signal processing stages that are placed in a low-power non-operational state in conformity with the measure of amplitude or frequency, whereby in at least one operating mode, when the measure indicates that the amplitude of the input signal or the frequency of the input signal is below a threshold value, at least one but not all of the plurality of digital signal processing stages is placed in the low-power non-operational state, and wherein when the measure indicates that the amplitude of the input signal or the frequency of the input signal is above the threshold value, the at least one digital signal processing stage is placed in an operational state to provide a higher performance from the plurality of digital signal processing stages. - View Dependent Claims (18, 19, 20)
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Specification