TRANSCEIVER
First Claim
1. A transceiver for use in a communications system that uses magnetic field induction to transmit data, the transceiver comprising:
- an amplifier for driving an antenna;
a capacitance connected in parallel with the antenna;
a resistance connected in parallel with the capacitance and the antenna, such that the antenna, capacitance and resistance form a parallel resonant circuit, wherein the value of the resistance is variable to permit adjustment of the loaded quality factor of the resonant circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
The present application relates to a transceiver for use in a communications system that uses magnetic field induction to transmit data, the transceiver having an amplifier for driving an antenna, the amplifier forming, with a capacitance and a resistance connected in parallel with the antenna, a parallel resonant circuit. The resistance value of the resistance is adjustable, to permit adjustment of the loaded quality factor of the parallel resonant circuit. The transceiver includes a processing unit configured to determine the signal to noise ratio (SNR) of a signal received by the transceiver, and based on this SNR select a modulation scheme to apply to a data signal to be transmitted by the transceiver. The value of the resistance is adjusted to a level at which the loaded quality factor of the parallel resonant circuit is able to support the bandwidth and data rate required by the selected modulation scheme.
41 Citations
12 Claims
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1. A transceiver for use in a communications system that uses magnetic field induction to transmit data, the transceiver comprising:
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an amplifier for driving an antenna; a capacitance connected in parallel with the antenna; a resistance connected in parallel with the capacitance and the antenna, such that the antenna, capacitance and resistance form a parallel resonant circuit, wherein the value of the resistance is variable to permit adjustment of the loaded quality factor of the resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification