System and method for an energy efficient RF transceiver
First Claim
1. A method of reducing the power consumption of a wireless communications device, the device having a sleep mode and a wake-up mode, comprising the steps of:
- (a) placing a first receiver portion of the device in a wake-up mode;
(b) receiving a signal having a header and a payload;
(c) decoding the header to determine an identity of the intended receiver in the first receiver portion;
(d) placing the first receiver portion in a sleep mode if the device is not the intended receiver; and
(e) waking up a second receiver portion and decoding the payload in the second receiver portion if the device is the intended receiver.
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Accused Products
Abstract
An energy efficient radio having a clocking system utilizing two clocks with very different precision and power characteristics. In another aspect, the time that a radio spends on listening/receiving is optimized so that energy is not wasted when there is no need to keep receiving. In another aspect, to further improve the energy efficiency, two receive portions with drastic difference in power consumption, instead of a single receive portion as is used in a typical wireless receiver, and are used to process different parts of a received packet.
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Citations
14 Claims
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1. A method of reducing the power consumption of a wireless communications device, the device having a sleep mode and a wake-up mode, comprising the steps of:
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(a) placing a first receiver portion of the device in a wake-up mode; (b) receiving a signal having a header and a payload; (c) decoding the header to determine an identity of the intended receiver in the first receiver portion; (d) placing the first receiver portion in a sleep mode if the device is not the intended receiver; and (e) waking up a second receiver portion and decoding the payload in the second receiver portion if the device is the intended receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An energy efficient wireless device comprising:
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a first receiver portion having an operational amplifier feeding a Direct Sequence Spread Spectrum decoder and an identity decoder; a second receiver portion having an analog to digital converter feeding a signal processor; a first clock for providing timing to the first receiver portion; and a second clock having a precision greater than the first clock;
for providing timing to the second receiver portion; andwherein the first receiver portion processes a portion of a received signal and passes the received signal to the second receiver portion as a function of the processing by the first receiver portion. - View Dependent Claims (13, 14)
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Specification