US 11,797,792 B2Granted

Method of processing a signal of a passive RFID chip with a reader

AssigneeY Soft Corporation

InventorsVladislav Kasík, Pavel Stan{hacek over (e)}k

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Abstract

The subject of the invention Is a method of processing a signal of a passive RFID chip (1) with a reader (2) in order to amplify the useful signal. A method of processing a signal of a passive RFID chip (1) with a reader (2) comprising an antenna (3), an operational amplifier (4), an AD converter (5) and a first DA converter (6) and a second DA converter (7) or a source of constant voltage consists of steps of transmitting the source signal of the antenna (3), receiving the source signal of the antenna (3) by the RFID chip (1), transmitting the RFID chip (1) signal and receiving the RFID chip (1) signal by the antenna (3), wherein the received RFID chip (1) signal and the output of the first DA converter (6) is fed to the inverting input of the operational amplifier (4) and the output of the second DA converter (7) or the output of the source of constant voltage is fed to the non-inverting input of the operational amplifier (4). After converting the signal by the AD converter (5) the amplitude of two consecutive peaks belonging to a single wave is subtracted, wherein the individual signals are temporarily stored in the buffer (12) before subtraction.

Claims6

Dependent claims

A method of processing a signal of a passive RFID chip with a reader comprising an antenna, an operational amplifier, an AD converter and a first DA converter and further a second DA converter or a source of constant voltage, consisting of steps of transmitting the source signal of the antenna, receiving the source signal of the antenna by the RFID chip, transmitting the RFID chip signal and receiving the RFID chip signal by the antenna, wherein

a received RFID chip signal and an output of the first DA converter are fed to a inverting input of the operational amplifier,
an output of the second DA converter or an output of the source of constant voltage is fed to a non-inverting input of the operational amplifier,
a first pair of values of voltage of the first and the second DA converter or the source of constant voltage is chosen, wherein this pair of values is chosen so that a window of the operational amplifier scans a positive half wave of the received signal,
a second pair of values of voltage of the first and the second DA converter or the source of constant voltage is chosen, wherein this pair of values is chosen so that the window of the operational amplifier scans a negative half wave of the received signal,
pulses corresponding to a transferred information of the RFID chip are detected in positive and negative half waves,
the final signal is fed to the AD converter,
pulses detected from the same wave are subtracted.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/640,078Filed 3 Sep 2020
Priority: CZ CZ2019-5633 Sep 2019
Published: US 2022/0300724 A122 Sep 2022
Granted: 24 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G06K 7/10158
Sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves: methods and means used by the interrogation device for…
G06K 7/10366
Sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves: the interrogation device being adapted for…
H03F 3/195
With semiconductor devices only: in integrated circuits
H03F 3/45475
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using IC blocks as the active…