Method and apparatus for waking up a circuit and applications thereof
First Claim
1. A wake up circuit comprises:
- first detection module operably coupled to a data path to determine whether a signal is present on the data path, wherein, when the signal is detected on the data path, the first detection module produces an enable signal; and
second detection module operable based on the enable signal, wherein, when the enable signal is produced, the second detection module is operably coupled to determine whether a characteristic of the signal is one of a known set of characteristics, wherein, when the characteristic is one of the known set of characteristics, the second detection module provides a signal present signal, and wherein the second detection module is inoperable when the enable signal is not produced.
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Abstract
A method and apparatus for waking up a circuit includes processing that begins by determining whether a signal is present on a data path by a 1st detection module. The 1st detection module is designed with passive components such that it consumes a minimal amount of power. In addition, the 1st detection module detects the presence of any signal on the received path using the energy of the signal. When a signal is detected, a 2nd detection module is enabled to determine whether a characteristic of the signal is one of a known set of characteristics. The known set of characteristics includes a phase relationship, magnitude, power level, frequency, and/or any other characteristic a telecommunication system may have. When the characteristic of the signal is one of the known set of characteristics, the digital circuitry of a modem is enabled.
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Citations
21 Claims
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1. A wake up circuit comprises:
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first detection module operably coupled to a data path to determine whether a signal is present on the data path, wherein, when the signal is detected on the data path, the first detection module produces an enable signal; and
second detection module operable based on the enable signal, wherein, when the enable signal is produced, the second detection module is operably coupled to determine whether a characteristic of the signal is one of a known set of characteristics, wherein, when the characteristic is one of the known set of characteristics, the second detection module provides a signal present signal, and wherein the second detection module is inoperable when the enable signal is not produced. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An analog front end comprises:
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transmit path that includes;
digital to analog converter operably coupled to convert a digital transmit signal into an analog transmit signal;
line driver operably coupled to amplify energy of the analog transmit signal to produce an amplified analog transmit signal;
receive path that includes;
filter having an input and an output, wherein the input is operably coupled to receive an analog receive signal, wherein the filter filters and amplifies the analog receive signal to produce a filtered analog receive signal;
oversampling quantizer operably coupled to convert the filtered analog receive signal into a stream of digital data;
decimation filter operably coupled to decimate the stream of digital data into a digital receive signal;
wake up circuit operably coupled to disable the digital portions of the transmit and receive paths until a viable analog receive signal is detected, the wake up circuit includes;
first detection module operably coupled to determine whether a signal is present at the input of the filter, wherein, when the signal is detected at the input of the filter, the first detection module produces an enable signal; and
second detection module operable based on the enable signal, wherein, when the enable signal is produced, the second detection module is operably coupled to determine whether a characteristic of the signal is one of a known set of characteristics of the analog receive signal, wherein, when the characteristic is one of the known set of characteristics, the second detection module provides a signal present signal, and wherein at least some of the digital portions of the transmit and receive paths are enabled based on the signal present signal. - View Dependent Claims (9, 10, 11, 12, 13, 15, 16, 17, 19, 20, 21)
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14. A method for waking up a circuit, the method comprises the steps of:
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determining whether a signal is present on a data path;
when the signal is detected on the data path, determining whether a characteristic of the signal is one of a known set of characteristics;
when the characteristic is one of the known set of characteristics, determining whether the signal is a particular type of signal; and
when the signal is the particular type of signal, producing a system wake-up signal.
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18. An apparatus for waking up a circuit, the apparatus comprises:
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processing module; and
memory operably coupled to the processing module, wherein the memory stores operational instructions that cause the processing module to;
determine whether a signal is present on a data path;
when the signal is detected on the data path, determine whether a characteristic of the signal is one of a known set of characteristics;
when the characteristic is one of the known set of characteristics, determine whether the signal is a particular type of signal; and
when the signal is the particular type of signal, produce a system wake-up signal.
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Specification