Transmission apparatus for a wireless device using delta-sigma modulation
First Claim
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1. A method comprising:
- receiving, via an antenna of a wireless device, an original signal transmitted by a detecting device;
receiving, at a decoder of the wireless device, an N-bit digital waveform representing information within the wireless device, wherein the decoder is coupled to a variable impedance circuit of the wireless device; and
responsive to the received N-bit digital waveform, modulating a variable impedance value of the variable impedance circuit, wherein the N-bit digital waveform has a modulation type,wherein a backscattering coefficient of the antenna changes responsively to the modulated variable impedance value to backscatter the original signal as a modulated signal that is a frequency offset form of the N-bit digital waveform, andwherein the N-bit digital waveform received by the decoder produces a control signal for the variable impedance circuit that is related to the N-bit digital waveform.
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Abstract
A transmission apparatus for a wireless device, comprising: an antenna for receiving an original signal and for backscattering a modulated signal containing information from the wireless device; a variable impedance coupled to the antenna, the variable impedance having an impedance value; a delta-sigma modulator coupled to the variable impedance for modulating the impedance value, and thereby a backscattering coefficient for the antenna, in accordance with the information to generate the modulated signal; and, a decoder coupled to the delta-sigma modulator for generating the impedance value from the information.
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Citations
25 Claims
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1. A method comprising:
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receiving, via an antenna of a wireless device, an original signal transmitted by a detecting device; receiving, at a decoder of the wireless device, an N-bit digital waveform representing information within the wireless device, wherein the decoder is coupled to a variable impedance circuit of the wireless device; and responsive to the received N-bit digital waveform, modulating a variable impedance value of the variable impedance circuit, wherein the N-bit digital waveform has a modulation type, wherein a backscattering coefficient of the antenna changes responsively to the modulated variable impedance value to backscatter the original signal as a modulated signal that is a frequency offset form of the N-bit digital waveform, and wherein the N-bit digital waveform received by the decoder produces a control signal for the variable impedance circuit that is related to the N-bit digital waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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receiving, via an inductor coupled to an antenna, an original signal transmitted by a detecting device; transmitting by mutual inductance a modulated signal containing information from a wireless device; coupling a variable impedance circuit to the inductor, the variable impedance circuit having an impedance element with an impedance value; modulating the impedance value and thereby a value of the mutual inductance, comprising; controlling a decoder to generate a control signal in accordance with the information; and coupling the decoder and thereby the control signal to the variable impedance circuit; and generating the information as a complex modulate signal using an in-phase signal and a quadrature signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification