Systems and Methods for Wireless Transmission of Biopotentials
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Abstract
The invention relates to wireless biotelemetry of low level bioelectric and biosensor signals by means of directly modulating the backscatter of a resonant circuit. Low level electrical analog or digital signals are directly applied to a resonant circuit containing a voltage-variable capacitor such as a varactor diode, that proportionally shifts the resonant frequency and so amplitude of radiofrequency backscatter in a way that represents analog bioelectric or biosensor waveform data. By strongly driving the resonant circuit with a radiofrequency source, a voltage variable capacitance can be caused to amplify the bio-signal level by a parametric process and so provide sufficient sensitivity to telemeter for low millivolt and microvolt level signals without additional amplification. A feature of the device is its simplicity and that it accomplishes both modulation and preamplification of low level sensor signals by the same variable capacitance circuit which reduces the device size and power consumption.
130 Citations
79 Claims
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1-52. -52. (canceled)
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53. An apparatus comprising:
an electronic circuit configured to provide an inductance and a variable capacitance, wherein; the electronic circuit is configured to receive an excitation signal and an analog sensor signal; the electronic circuit has a resonant frequency that varies in response to a biosignal; the electronic circuit is configured to transmit a response signal when the electronic circuit receives the excitation signal and the biosignal; and a characteristic of the analog signal can be determined by measuring the response signal. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79)
Specification