NFC receiver and operation method of circuit comprising the NFC receiver
First Claim
1. A method of operating a near-field communication (NFC) circuit, the method comprising:
- receiving an interference signal and a data signal through an antenna;
adjusting magnitudes of the received interference signal and the received data signal;
down-converting frequencies of the interference signal and the data signal;
filtering the data signal by removing the frequency down-converted interference signal; and
adjusting a magnitude of the filtered data signal,wherein the adjusting the magnitudes of the received interference signal and the received data signal comprises adjusting the magnitudes of the interference signal and the data signal such that linearity of the data signal is maintained during signal processing performed on the interference signal and the data signal in the down-converting of the frequencies of the interference signal and the data signal, the filtering of the data signal, and the adjusting of the magnitude of the filtered data signal,wherein the adjusting the magnitude of the filtered data signal further comprises;
adjusting, at a first time, the magnitude of the filtered data signal based on a first gain value;
performing, at a second time later than the first time, analog to digital conversion of the data signal having the adjusted magnitude;
detecting a magnitude of the data signal on which the analog-to-digital conversion is performed; and
adjusting the first gain value in response to a determination that the data signal having the detected magnitude cannot be demodulated without saturation.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of operating a near-field communication (NFC) circuit, the method including: receiving an interference signal and a data signal through an antenna; adjusting magnitudes of the received interference signal and the received data signal; down-converting frequencies of the interference signal and the data signal, the magnitudes of which are adjusted; filtering the data signal by removing the frequency down-converted interference signal; and adjusting a magnitude of the filtered data signal. The adjusting of the magnitudes of the received interference signal and the received data signal may include adjusting the magnitudes of the interference signal and the data signal such that linearity of the data signal is maintained during signal processing performed on the interference signal and the data signal in the down-converting of the frequencies of the interference signal and the data signal, the filtering of the data signal, and the adjusting of the magnitude of the filtered data signal.
13 Citations
19 Claims
-
1. A method of operating a near-field communication (NFC) circuit, the method comprising:
-
receiving an interference signal and a data signal through an antenna; adjusting magnitudes of the received interference signal and the received data signal; down-converting frequencies of the interference signal and the data signal; filtering the data signal by removing the frequency down-converted interference signal; and adjusting a magnitude of the filtered data signal, wherein the adjusting the magnitudes of the received interference signal and the received data signal comprises adjusting the magnitudes of the interference signal and the data signal such that linearity of the data signal is maintained during signal processing performed on the interference signal and the data signal in the down-converting of the frequencies of the interference signal and the data signal, the filtering of the data signal, and the adjusting of the magnitude of the filtered data signal, wherein the adjusting the magnitude of the filtered data signal further comprises; adjusting, at a first time, the magnitude of the filtered data signal based on a first gain value; performing, at a second time later than the first time, analog to digital conversion of the data signal having the adjusted magnitude; detecting a magnitude of the data signal on which the analog-to-digital conversion is performed; and adjusting the first gain value in response to a determination that the data signal having the detected magnitude cannot be demodulated without saturation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of operating a near-field communication (NFC) circuit, the method comprising:
-
receiving a first signal including an interference signal or a modulated data signal through an antenna; attenuating a magnitude of the received first signal; down-converting a frequency of the first signal having the attenuated magnitude based on a local oscillation signal having a frequency for communication of the NFC circuit; filtering the modulated data signal included in the frequency down-converted first signal; and adjusting a magnitude of the filtered data signal, wherein the attenuating the magnitude of the received first signal comprises attenuating the magnitude of the first signal such that linearity of the modulated data signal is maintained in signal processing performed on the first signal in the down-converting of the frequency of the first signal, the filtering of the modulated data signal, and the adjusting of the magnitude of the filtered data signal, and wherein the adjusting the magnitude of the filtered data signal comprises adjusting the magnitude of the filtered data signal such that the filtered data signal has a sufficient magnitude for demodulating without saturation, wherein the adjusting the magnitude of the filtered data signal further comprises; adjusting, at a first time, the magnitude of the filtered data signal based on a first gain value; performing, at a second time later than the first time, analog to digital conversion of the data signal having the adjusted magnitude; detecting a magnitude of the data signal on which the analog-to-digital conversion is performed; and adjusting the first gain value in response to a determination that the data signal having the detected magnitude cannot be demodulated without saturation. - View Dependent Claims (13)
-
-
14. A near-field communication (NFC) receiver performing communication through an antenna, the NFC receiver comprising:
-
a first adjusting unit configured to receive a data signal or an interference signal through the antenna, and attenuate a magnitude of the data signal or the interference signal based on a first attenuation value; a mixer configured to down-convert a frequency of the data signal or the interference signal output by the first adjusting unit; a filter configured to filter the data signal from the data signal or the interference signal output by the mixer; a second adjusting unit configured to receive the filtered data signal and adjust a magnitude of the data signal based on a first gain value; and an automatic gain controller (AGC) configured to adjust the first attenuation value based on the magnitude of the data signal or the interference signal that is attenuated using the first adjusting unit, and to adjust the first gain value based on the magnitude of the data signal that is adjusted using the second adjusting unit, wherein adjusting the magnitude of the data signal comprises one of amplifying the magnitude of the data signal and attenuating the magnitude of the data signal, and wherein the second adjusting unit comprises; a variable gain amplifier configured to receive the filtered data signal and adjust the data signal based on the first gain value, adjusting the data signal comprising one of amplifying the data signal and attenuating the data signal; an analog-to-digital converter configured to receive an output signal of the variable gain amplifier and perform analog-to-digital conversion on the output signal to output the analog-to-digital converted signal. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification