Radio communications system designed for a low-power receiver
First Claim
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1. A low power receiver, comprising:
- an antenna;
a resonant circuit;
a nonlinear device, wherein said antenna forms said resonant circuit or a part of said resonant circuit, or is directly or indirectly coupled to said resonant circuit;
said antenna and said resonant circuit tuned to receive a first high frequency carrier of a predetermined first frequency F1 and a second high frequency carrier of a predetermined second frequency F2 simultaneously, which differ from each other by a predetermined intermediate or baseband frequency Fout =|F2−
F1|, wherein said nonlinear device is directly or indirectly connected to said resonant circuit and configured to generate an intermediate frequency signal or a baseband signal, respectively, of frequency Fout, wherein said low power receiver is configured to operate according to a heterodyne principle to down convert a high frequency signal to said intermediate frequency signal or said baseband signal, respectively, via a mix of said first high frequency carrier and said second high frequency carrier to thus regain said intermediate frequency signal without a local oscillator;
a second nonlinear device coupled to the antenna, said second nonlinear device comprising a signal input configured to receive signals having at least two different frequencies that include said predetermined first frequency F1 and said predetermined second frequency F2 and a signal output, said second nonlinear device configured to generate at least signals having two further frequencies F21 and F12 from received signals of said predetermined first frequency F1 and said predetermined second frequency F2 and to couple the signals having said two further frequencies F21 and F12 back to said antenna to transmit data out of said antenna; and
,wherein said low power receiver is configured to reside within an implantable device configured to be implanted in a body of a mammal and wherein said implantable medical device is a pacemaker, a cardioverter/defibrillator, or a combination thereof.
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Abstract
The invention relates to methods by which radio signals can be transmitted to, and received by, a radio receiver such that the receiver consumes very little power from a battery or energy source. The invention also relates to methods by which radio signals, modulated with data information, can be produced by a transmitter that consumes very little power. The invention is applicable not only to medical implants, but any application requiring a radio receiver to operate with very low power consumption.
51 Citations
33 Claims
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1. A low power receiver, comprising:
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an antenna; a resonant circuit; a nonlinear device, wherein said antenna forms said resonant circuit or a part of said resonant circuit, or is directly or indirectly coupled to said resonant circuit; said antenna and said resonant circuit tuned to receive a first high frequency carrier of a predetermined first frequency F1 and a second high frequency carrier of a predetermined second frequency F2 simultaneously, which differ from each other by a predetermined intermediate or baseband frequency Fout =|F2−
F1|, wherein said nonlinear device is directly or indirectly connected to said resonant circuit and configured to generate an intermediate frequency signal or a baseband signal, respectively, of frequency Fout, wherein said low power receiver is configured to operate according to a heterodyne principle to down convert a high frequency signal to said intermediate frequency signal or said baseband signal, respectively, via a mix of said first high frequency carrier and said second high frequency carrier to thus regain said intermediate frequency signal without a local oscillator;a second nonlinear device coupled to the antenna, said second nonlinear device comprising a signal input configured to receive signals having at least two different frequencies that include said predetermined first frequency F1 and said predetermined second frequency F2 and a signal output, said second nonlinear device configured to generate at least signals having two further frequencies F21 and F12 from received signals of said predetermined first frequency F1 and said predetermined second frequency F2 and to couple the signals having said two further frequencies F21 and F12 back to said antenna to transmit data out of said antenna; and
,wherein said low power receiver is configured to reside within an implantable device configured to be implanted in a body of a mammal and wherein said implantable medical device is a pacemaker, a cardioverter/defibrillator, or a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification