Method and device for modulating an active load
First Claim
1. A method comprising:
- producing, by an inductive antenna circuit, a first periodic signal that is based on an alternating external magnetic field;
producing, by an oscillator circuit, a second periodic signal that is based on the first periodic signal;
transmitting, in correspondence with a data-carrying modulation signal, a sequence of data bits of a data frame by sequentially and repetitively;
applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit to transmit a portion of the data frame, the second periodic signal being applied to the inductive antenna circuit in response to the data-carrying modulation signal having a first logic value; and
after transmitting the portion of the data frame, inhibiting, with the oscillator circuit operating in a synchronous oscillation mode, application of the second periodic signal to the inductive antenna circuit, application of the second periodic signal to the inductive antenna circuit being inhibited in response to the data-carrying modulation signal having a second logic value, the second logic value being opposite the first logic value,the synchronous oscillation mode of the oscillator circuit causing the second periodic signal to be synchronized to the first periodic signal.
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Accused Products
Abstract
In a general aspect, a method can include producing, by an inductive antenna circuit, a first periodic signal that is based on an alternating external magnetic field; producing, by an oscillator circuit, a second periodic signal that is based on the first periodic signal; and transmitting, in correspondence with a data-carrying modulation signal, a sequence of data bits. The transmitting can include sequentially and repetitively: applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit; and inhibiting, with the oscillator circuit operating in a synchronous oscillation mode, application of the second periodic signal to the inductive antenna circuit. The synchronous oscillation mode of the oscillator circuit can cause the second periodic signal to be synchronized to the first periodic signal.
15 Citations
16 Claims
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1. A method comprising:
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producing, by an inductive antenna circuit, a first periodic signal that is based on an alternating external magnetic field; producing, by an oscillator circuit, a second periodic signal that is based on the first periodic signal; transmitting, in correspondence with a data-carrying modulation signal, a sequence of data bits of a data frame by sequentially and repetitively; applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit to transmit a portion of the data frame, the second periodic signal being applied to the inductive antenna circuit in response to the data-carrying modulation signal having a first logic value; and after transmitting the portion of the data frame, inhibiting, with the oscillator circuit operating in a synchronous oscillation mode, application of the second periodic signal to the inductive antenna circuit, application of the second periodic signal to the inductive antenna circuit being inhibited in response to the data-carrying modulation signal having a second logic value, the second logic value being opposite the first logic value, the synchronous oscillation mode of the oscillator circuit causing the second periodic signal to be synchronized to the first periodic signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for sending a data frame, the device comprising:
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an inductive antenna circuit configured to produce a first periodic signal that is based on an alternating external magnetic field; an oscillator circuit configured to produce a second periodic signal that is based on the first periodic signal; and an active load modulation circuit configured to provide a data-carrying modulation signal, the device being configured to; transmit, in correspondence with the data-carrying modulation signal, a sequence of data bits of a data frame by sequentially and repetitively; applying, with the oscillator circuit operating in a free oscillation mode, the second periodic signal to the inductive antenna circuit to transmit a portion of the data frame, the second periodic signal being applied to the inductive antenna circuit in response to the data-carrying modulation signal having a first logic value; and after transmitting the portion of the data frame, inhibiting, with the oscillator circuit operating in a synchronous oscillation mode, application of the second periodic signal to the inductive antenna circuit, application of the second periodic signal to the inductive antenna circuit being inhibited in response to the data-carrying modulation signal having a second logic value, the second logic value being opposite the first logic value, the synchronous oscillation mode of the oscillator circuit causing the second periodic signal to be synchronized to the first periodic signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification