RFID reader
First Claim
Patent Images
1. An RFID reader which reads data from an RFID tag using a wireless connection over a specified frequency bandwidth, comprising:
- a transmitting unit which sequentially and cumulatively synthesizes a specific frequency signal from frequency control signals generated every clock, mixes the synthesized specific frequency signal and a fixed frequency signal, and outputs an RF signal as a result,wherein the transmitting unit comprises;
a frequency synthesizing unit which sequentially and cumulatively synthesizes the specific frequency signal from the frequency control signals generated every clock, and outputs the specific frequency signal;
a fixed frequency generating unit which generates and outputs the fixed frequency signal, which is fixed to a specified level;
a modulating unit which modulates the fixed frequency signal outputted from the fixed frequency generating unit with the specific frequency signal outputted from the frequency synthesizing unit, and outputs an RF signal as a result; and
an amplifying unit which amplifies the RF signal outputted from the modulating unit to a specific level and transmits the amplified signal through an antenna,wherein the modulating unit comprises;
a first phase shifting unit which phase-shifts the specific frequency signal by 90 degrees and outputs an in-phase signal as a result;
a second phase shifting unit which phase-shifts the fixed frequency signal by 90 degrees and outputs a signal;
a first mixer which mixes the in-phase signal from the first phase shifting unit and the signal output from the second phase shifting unit;
a second mixer which mixes the fixed frequency signal and a quadrature-phase signal of the specific frequency signal; and
an adding unit which adds a signal output from the first mixer and a signal output from the second mixer, and outputs the RF signal as a result.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided are an RFID reader reading data from an RFID tag using a wireless connection over a specified frequency bandwidth, including a transmitting unit synthesizing sequentially and cumulatively frequency control signals generated every clock, mixing the synthesized specific frequency signal and a fixed frequency signal, and as a result outputting an RF signal.
15 Citations
13 Claims
-
1. An RFID reader which reads data from an RFID tag using a wireless connection over a specified frequency bandwidth, comprising:
-
a transmitting unit which sequentially and cumulatively synthesizes a specific frequency signal from frequency control signals generated every clock, mixes the synthesized specific frequency signal and a fixed frequency signal, and outputs an RF signal as a result, wherein the transmitting unit comprises; a frequency synthesizing unit which sequentially and cumulatively synthesizes the specific frequency signal from the frequency control signals generated every clock, and outputs the specific frequency signal; a fixed frequency generating unit which generates and outputs the fixed frequency signal, which is fixed to a specified level; a modulating unit which modulates the fixed frequency signal outputted from the fixed frequency generating unit with the specific frequency signal outputted from the frequency synthesizing unit, and outputs an RF signal as a result; and an amplifying unit which amplifies the RF signal outputted from the modulating unit to a specific level and transmits the amplified signal through an antenna, wherein the modulating unit comprises; a first phase shifting unit which phase-shifts the specific frequency signal by 90 degrees and outputs an in-phase signal as a result; a second phase shifting unit which phase-shifts the fixed frequency signal by 90 degrees and outputs a signal; a first mixer which mixes the in-phase signal from the first phase shifting unit and the signal output from the second phase shifting unit; a second mixer which mixes the fixed frequency signal and a quadrature-phase signal of the specific frequency signal; and an adding unit which adds a signal output from the first mixer and a signal output from the second mixer, and outputs the RF signal as a result. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An RFID reader which reads data from an RFID tag using a wireless connection over a specified frequency bandwidth, comprising:
-
a transmitting unit which pulses-shapes a frequency control signal generated every clock in order to generate a specific frequency signal, mixes the specific frequency signal and a changed frequency, and outputs an RF signal as a result, and a controlling unit which outputs the frequency control signal every clock and controls a change of a frequency to synchronize phases of the specific frequency signal and the changed frequency; the transmitting unit performs the pulse shaping by adjusting ascending and descending times of the frequency control signal generated every clock and outputs the specific frequency signal as a result; the transmitting unit comprising a frequency changing unit which changes a frequency to synchronize phases of the specific frequency signal and the changed frequency in accordance with a specific control and a modulating unit which mixes the changed frequency and the specific frequency signal and an amplifying unit which amplifies a signal outputted from the modulating unit to a specific level and transmits an amplified signal through an antenna. - View Dependent Claims (7)
-
-
8. An RFID reader which reads data from an RFID tag using a wireless connection over a specified frequency bandwidth, comprising:
-
a transmitting unit which pulse-shapes a frequency control signal generated every clock in order to generate a specific frequency signal, mixes the specific frequency signal and a changed frequency, and outputs an RF signal as a result; and a receiving unit which mixes a frequency of a signal transmitted from the RFID tag by way of squaring the frequency, converts the mixed signal into a digital signal, and extracts data as a result, wherein the transmitting unit comprises; a pulse shaping unit which performs pulse shaping by adjusting ascending and descending times of the frequency control signal generated every clock, and outputs the specific frequency signal as a result; a frequency changing unit which changes a frequency to synchronize phases of the specific frequency signal and the changed frequency in accordance with a specific control; a modulating unit which mixes the changed frequency and the specific frequency signal; and an amplifying unit which amplifies a signal outputted from the modulating unit to a specific level and transmits an amplified signal through an antenna. - View Dependent Claims (9, 10)
-
-
11. A RFID reader which reads data from an RFID tag using a wireless connection over a specified frequency bandwidth, comprising:
-
a transmitting unit which pulse-shapes a frequency control signal generated every clock in order to generate a specific frequency signal, mixes the specific frequency signal and a changed frequency, and outputs an RF signal as a result; and a receiving unit which detects a level of a signal received from the RFID tag, converts a detected level of the signal into a digital signal, and extracts data as a result, wherein the transmitting unit comprises; a pulse shaping unit which performs pulse shaping by adjusting ascending and descending times of the frequency control signal generated every clock, and outputs the specific frequency signal as a result; a frequency changing unit which changes a frequency to synchronize phases of the specific frequency signal and the changed frequency in accordance with a specific control; a modulating unit which mixes the changed frequency and the specific frequency signal; and an amplifying unit which amplifies a signal outputted from the modulating unit to a specific level and transmits an amplified signal through an antenna. - View Dependent Claims (12, 13)
-
Specification