US 8,917,163 B2Granted

Active electronic tag apparatus for memory card

AssigneeBeing Tech Electronics Corp.

InventorChiung-Ching Ku

Life of this patent

Estimating the term…

Loading patent…

Abstract

An active electronic tag for a memory card is disclosed herein. The active electronic tag includes an antenna, a first amplifier, an automatic gain control circuit, a phase synchronization locking circuit, a decoding and TX/RX control unit and a second amplifier. The antenna receives a detecting signal transmitted from a card reader, in which the detecting signal is carried on a first carrier. The phase synchronization locking circuit generates a positive carrier and a negative carrier with a phase difference of 180 degree. The decoding and TX/RX control unit generates a response signal, which is carried on the negative carrier. By utilizing the phase difference of the first carrier and the negative carrier, the response signal cancels the first carrier on the card reader, so as to transmit the information saved inside the active electronic tag.

Claims9

Dependent claims

An active electronic tag, comprising:

an antenna, for receiving a detecting signal transmitted from a card reader, wherein the detecting signal is carried on a first carrier;
a first amplifier, electrically coupled to the antenna, for amplifying the detecting signal;
an automatic gain control circuit, electrically coupled to the first amplifier and utilizing a feedback method to control the first amplifier to stably amplify the detecting signal;
a phase synchronization locking circuit, electrically coupled to the first amplifier, and receiving the amplified detecting signal and a transmitting control signal to generate a positive carrier and a negative carrier;
a decoding and transmission/reception (TX/RX) control unit, electrically coupled to the first amplifier and the phase synchronization locking circuit, receiving the amplified detecting signal, the positive carrier and the negative carrier, detecting the detecting signal of the first carrier, and generating the transmitting control signal and a response signal according to the detecting signal of the first carrier, wherein the response signal is carried on the negative carrier;
and
a second amplifier, electrically coupled to the decoding and TX/RX control unit and the antenna, for amplifying the response signal to the antenna and transmitting the response signal to the card reader by the antenna;
wherein the response signal utilizes a phase difference between the negative carrier and the first carrier to cancel the first carrier on the card reader, so as to transmit information;
wherein the decoding and TX/RX control unit comprises:
a decoding circuit, for detecting variation of the detecting signal of the first carrier, and controlling a microcontroller containing tag memory to generate the transmitting control signal according to the detecting signal;
a one-out-of-two switch, wherein when the one-out-of-two switch receives the transmitting control signal, a driving clock provided to the decoding circuit is switched to the positive carrier, and when the transmitting control signal is stopped, the driving clock is switched to the first carrier;
and
a transmitting switch, receiving the negative carrier and the transmitting control signal to generate the response signal to the second amplifier.

10 more elements

A signal modulation method of an active electronic tag, adapted to an active electronic tag comprising a tag memory for storing tag information, the signal modulation method of the active electronic tag comprising:

receiving a detecting signal transmitted from a card reader, wherein the detecting signal is carried on a first carrier;
utilizing a feedback method to stably amplify the detecting signal;
transmitting the detecting signal to a decoding circuit and utilizing the first carrier or a positive carrier as a driving clock of the decoding circuit to drive the decoding circuit, wherein the decoding circuit detects the detecting signal of the first carrier and controls a microcontroller containing tag memory to generate a transmitting control signal;
generating the positive carrier and a negative carrier according to an oscillator frequency and the transmitting control signal;
generating the transmitting control signal and a response signal according to the positive carrier, the negative carrier, and the tag information when variation of the detecting signal of the first carrier is detected, wherein the response signal is carried on the negative carrier;
and
amplifying the response signal and transmitting the amplified response signal to the card reader, wherein the response signal utilizes a phase difference between the negative carrier and the first carrier to cancel the first carrier on the card reader, so as to transmit the information;
wherein the step of generating the response signal and the transmitting control signal comprises:
detecting the first carrier and the detecting signal to notify the microcontroller containing tag memory to generate the transmitting control signal;
switching the driving clock inputted to the decoding circuit according to the transmitting control signal;
and
inputting the negative carrier and the transmitting control signal simultaneously to a transmitting switch to generate the response signal.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/769,391Filed 18 Feb 2013
Priority: CN 2012 1 052560410 Dec 2012
Published: US 2014/0159871 A112 Jun 2014
Granted: 23 Dec 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G06K 19/0723
With integrated circuit chips: the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on…
G06K 19/073
With integrated circuit chips: special arrangements for circuits, e.g. for protecting identification code in memory
H03G 3/3052
In amplifiers having semiconductor devices: in bandpass amplifiers or in frequency-changers used in a heterodyne receiver
H04B 5/266
Using coils: one coil at each side, e.g. with primary and secondary coils