公开(公告)号：US10296822B2

公开(公告)日：2019-05-21

申请号：US15894440

申请日：2018-02-12

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Anton Stern ,  Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K19/07 ,  G06K19/077

Abstract: An RFID transponder device has antenna terminals for coupling an antenna system to the device. A transmitter and a receiver are coupled to the antenna terminals. The device has at least one damping resistance connected to at least one of the antenna terminals. The at least one damping resistance is connected, depending on a voltage swing at the antenna terminals during a transmission burst period, either together with a serially connected switch in parallel to the antenna terminals that are coupled to the receiver, or together with a parallel connected switch between one of the antenna terminals and a terminal of the transmitter. A damping control is configured to activate the at least one damping resistance during a damping period after the transmission burst period by controlling the respective switch.

公开(公告)号：US10242303B2

公开(公告)日：2019-03-26

申请号：US15473295

申请日：2017-03-29

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Iztok Bratuz ,  Albin Pevec ,  Kosta Kovacic ,  Maksimiljan Stiglic

IPC: G06K19/07 ,  G06K19/077 ,  H04L7/033

Abstract: In an embodiment, a carrier signal generation circuit can be used for a Radio-frequency identification (RFID) transponder device. A frequency divider circuit has a first input to receive a first frequency signal, a second input to receive a division ratio signal, and an output to provide a carrier signal as a function of the first frequency signal and the division ratio signal. A phase difference circuit has a first input to receive an analog reader device carrier signal, a second input to receive a signal based on the first frequency signal and an output to provide a digital phase difference signal as a function of the reader device carrier signal and the signal based on the first frequency signal. A signal processor has an input coupled to the output of the phase difference circuit.

公开(公告)号：US20170300723A1

公开(公告)日：2017-10-19

申请号：US15473074

申请日：2017-03-29

Applicant: STMicroelectronics International N.V

Inventor： Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K7/10 ,  G06K19/07

CPC classification number: G06K7/10009 ,  G06K19/0705 ,  G06K19/0723

Abstract: Embodiments provide a method for sending a message from an RFID transponder to a reader during a transmission frame using active load modulation, the method comprising. An encoded bit signal has a first logic level during first time segments within the transmission frame and a second logic level during second time segments within the transmission frame. The first time segments include an initial time segment of the transmission frame. A transmission signal is generated based on the encoded bit signal. The transmission signal is generated having a first phase depending on the first logic level during the first time segments, a second phase depending on the second logic level during the second time segments, and the second phase during a time interval preceding the transmission frame.

公开(公告)号：US09760822B2

公开(公告)日：2017-09-12

申请号：US14761291

申请日：2014-01-14

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Maksimiljan Stiglic ,  Kosta Kovacic ,  Albin Pevec ,  Anton Stern

IPC: G06K19/07 ,  G06K7/10 ,  H04B5/00

CPC classification number: H04B5/0056 ,  G06K7/10297 ,  G06K19/0701 ,  G06K19/0705 ,  G06K19/0723 ,  G06K19/0726 ,  H04B5/0075 ,  H04B5/0081

Abstract: An actively transmitting tag detects a shift of a phase of an antenna signal (as) with regard to a phase of a transmitted signal (ts) in time intervals with a length of one half-period of a subcarrier, in which time intervals it transmits high-frequency wave packets with their phase being inverted according to a communication protocol at the ends of said half-periods. Generation of said wave packets is controlled by said phase shift in a way that said phase shift retains its absolute value at transitions into subsequent half-periods. Synchronizing the tag's transmission to a received interrogator signal carried out even during tag's transmitting enables the tag to transmit according to protocol ISO 14443 B by inverting a phase at transitions between said half-periods. Said synchronizing is carried out although no time window without a tag transmitting exists within the transmitted data frame.

公开(公告)号：US20170116509A1

公开(公告)日：2017-04-27

申请号：US15397559

申请日：2017-01-03

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Anton Stern ,  Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K19/077 ,  G06K19/07

CPC classification number: G06K19/07773 ,  G06K19/0715 ,  G06K19/07749 ,  G06K19/0775

Abstract: An RFID transponder device has antenna terminals for coupling an antenna system to the device. A transmitter and a receiver are coupled to the antenna terminals. The device has at least one damping resistance connected to at least one of the antenna terminals. The at least one damping resistance is connected, depending on a voltage swing at the antenna terminals during a transmission burst period, either together with a serially connected switch in parallel to the antenna terminals that are coupled to the receiver, or together with a parallel connected switch between one of the antenna terminals and a terminal of the transmitter. A damping control is configured to activate the at least one damping resistance during a damping period after the transmission burst period by controlling the respective switch.

公开(公告)号：US09576237B2

公开(公告)日：2017-02-21

申请号：US14903584

申请日：2014-06-12

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Anton Stern ,  Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: G06K19/06 ,  G06K19/077

CPC classification number: G06K19/07773 ,  G06K19/0715 ,  G06K19/07749 ,  G06K19/0775

Abstract: An RFID transponder device has antenna terminals for coupling an antenna system to the device. A transmitter and a receiver are coupled to the antenna terminals. The device has at least one damping resistance connected to at least one of the antenna terminals. The at least one damping resistance is connected, depending on a voltage swing at the antenna terminals during a transmission burst period, either together with a serially connected switch in parallel to the antenna terminals that are coupled to the receiver, or together with a parallel connected switch between one of the antenna terminals and a terminal of the transmitter. A damping control is configured to activate the at least one damping resistance during a damping period after the transmission burst period by controlling the respective switch.

Abstract translation: RFID应答器设备具有用于将天线系统耦合到设备的天线端子。 发射器和接收器耦合到天线端子。 该装置具有连接到至少一个天线端子的至少一个阻尼电阻。 至少一个阻尼电阻根据传输脉冲串期间天线端子处的电压摆幅而连接，或者连接到与接收器耦合的天线端子并联连接的串联开关，或者与并联连接 在天线终端之一和发射机的终端之间切换。 阻尼控制被配置为通过控制相应的开关来在传输脉冲串周期之后的阻尼时段期间激活至少一个阻尼电阻。

公开(公告)号：US10608705B2

公开(公告)日：2020-03-31

申请号：US16435815

申请日：2019-06-10

Applicant: STMicroelectronics International N.V.

Inventor： Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: H04B5/00 ,  G06K19/077 ,  G06K19/07 ,  G06K7/00

Abstract: An RFID transponder includes a coding and modulation unit that generates a transmission signal by modulating an oscillator signal with an encoded bit signal. During a first and a second time segment, the encoded bit signal assumes a first and a second logic level, respectively. The transmission signal includes a first signal pulse having a first phase within the first time segment and a second signal pulse having a second phase that is shifted with respect to the first phase by a predefined phase difference within the second time segment. The transmission signal is paused for a pause period between the first and the second signal pulse. The pause period is shorter than a mean value of a period of the first time segment and a period of the second time segment.

公开(公告)号：US20190036568A1

公开(公告)日：2019-01-31

申请号：US15757771

申请日：2016-09-21

Applicant: STMicroelectronics International N.V.

Inventor： Kosta Kovacic ,  Albin Pevec

IPC: H04B5/00 ,  H04W4/80 ,  H04L27/04 ,  H04B1/04 ,  G06K7/10

CPC classification number: H04B5/0062 ,  G06K7/10366 ,  H04B1/04 ,  H04B5/0031 ,  H04L27/04 ,  H04W4/80

Abstract: When communicating using active load modulation in a Radio Frequency Identification (RFID) system, a carrier signal having a carrier frequency is received from a reader device. In response, a modulated signal is generated and a burst of a sending signal is transmitted. The sending signal is decayed at the end of the burst.

公开(公告)号：US20180343152A1

公开(公告)日：2018-11-29

申请号：US15580843

申请日：2016-06-09

Applicant: STMicroelectronics International N.V.

Inventor： Vinko Kunc ,  Albin Pevec ,  Kosta Kovacic

IPC: H04L27/06 ,  H03D1/18 ,  H03D1/22 ,  H03D1/02 ,  H04L27/26

Abstract: A demodulator circuit receives an envelope signal for comparison against a switched reference signal that is generated as a function of the envelope signal and as a function of an output signal of the demodulator circuit. The switched reference signal is filtered by an RC filter prior to comparison. The output signal is dependent on a difference between the filtered switched reference signal and the envelope signal.

公开(公告)号：US20180227019A1

公开(公告)日：2018-08-09

申请号：US15742962

申请日：2016-07-15

Applicant: STMicroelectronics International N.V.

Inventor： Kosta Kovacic ,  Albin Pevec ,  Maksimiljan Stiglic

IPC: H04B5/00 ,  G06K19/07 ,  G06K19/077 ,  G06K7/00

CPC classification number: H04B5/0068 ,  G06K7/0008 ,  G06K19/0715 ,  G06K19/0723 ,  G06K19/07749

Abstract: An RFID transponder includes a coding and modulation unit that generates a transmission signal by modulating an oscillator signal with an encoded bit signal. During a first and a second time segment, the encoded bit signal assumes a first and a second logic level, respectively. The transmission signal includes a first signal pulse having a first phase within the first time segment and a second signal pulse having a second phase that is shifted with respect to the first phase by a predefined phase difference within the second time segment. The transmission signal is paused for a pause period between the first and the second signal pulse. The pause period is shorter than a mean value of a period of the first time segment and a period of the second time segment.