WO2017012188A1 - Near field communication receive circuit - Google Patents

Near field communication receive circuit Download PDF

Info

Publication number
WO2017012188A1
WO2017012188A1 PCT/CN2015/090009 CN2015090009W WO2017012188A1 WO 2017012188 A1 WO2017012188 A1 WO 2017012188A1 CN 2015090009 W CN2015090009 W CN 2015090009W WO 2017012188 A1 WO2017012188 A1 WO 2017012188A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
amplifier
signal
control
input signal
Prior art date
Application number
PCT/CN2015/090009
Other languages
French (fr)
Chinese (zh)
Inventor
罗迤宝
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2017012188A1 publication Critical patent/WO2017012188A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits

Definitions

  • the utility model relates to a Near Field Communication (NFC) signal processing technology, in particular to an NFC receiving circuit.
  • NFC Near Field Communication
  • NFC is a contactless identification and interconnect technology that enables close-range wireless communication between mobile devices, consumer electronics, desktop computers and smart control tools. At present, the 13.56 MHz NFC technology is widely used in smart terminals.
  • the traditional NFC antenna occupies a large space, but as the functions of the intelligent terminal become more and more, the structure of the intelligent terminal becomes more and more compact, and the space allocated for the NFC antenna is also smaller and smaller. Therefore, the NFC antenna is miniaturized. In order to develop trends.
  • the NFC antenna is miniaturized, the NFC receiving circuit is not improved, and the miniaturization of the NFC antenna will result in a decrease in the receiving power of the NFC antenna and a decrease in the ability to receive signals; correspondingly, the signal quality of the antenna transmitted to the NFC chip. It is also poor. Therefore, the prior art fails to solve the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
  • the embodiment of the present invention is expected to provide an NFC receiving circuit, which can solve the problem of insufficient receiving power of the antenna when the NFC uses a small antenna.
  • a near field communication NFC receiving circuit comprising:
  • a coupler that receives and couples the input signal
  • control circuit that determines a control signal corresponding to an amplitude gain of the coupled input signal; An input end of the control circuit is connected to an output end of the coupler;
  • the input end receives the input signal, amplifies the input signal according to the control signal, and outputs a first amplifier of the amplified input signal through an output terminal; a control end of the first amplifier and an output end of the control circuit Connected.
  • the NFC receiving circuit further includes:
  • An adjustment circuit for detecting and/or shaping the amplified input signal, an input of the adjustment circuit being coupled to an output of the first amplifier.
  • the NFC receiving circuit further includes: a second amplifier
  • An output of the second amplifier is coupled to an input of the coupler and configured to receive and amplify an original signal to obtain the input signal.
  • control circuit is configured to track and amplify the coupled input signal to obtain a track-amplified signal, determine an envelope of the track-amplified signal, and determine and A control circuit for the control signal corresponding to the undulation of the envelope.
  • control circuit is a low noise amplifier, and a response frequency of the control circuit is consistent with a receiving frequency of the NFC receiving circuit.
  • control circuit is an envelope tracking amplification ET envelope tracking circuit, and an output of the ET envelope tracking circuit is a control voltage.
  • the first amplifier is a voltage controlled amplifier.
  • the coupler is a radio frequency coupler.
  • the adjustment circuit is a detection shaping circuit.
  • the second amplifier is a low noise amplifier LNA.
  • the embodiment of the present invention provides a short-range wireless communication technology NFC receiving circuit, which is provided with a coupler, a control circuit, and a first amplifier; receives and couples an input signal through a coupler; and determines and couples the input signal through the control circuit The amplitude gain corresponds to a control signal; the first amplifier is then used to amplify the input signal in accordance with the control signal.
  • the input signal is first coupled by the coupler, and then the control circuit outputs a control signal, and the first amplifier is controlled to amplify the input signal according to the control signal, thereby achieving the purpose of increasing the input signal; and, the control signal It is determined according to the tracked amplified and coupled input signal, that is, the control signal changes according to the amplitude gain variation of the input signal, and the first amplifier changes the amplification factor according to the amplitude gain of the input signal. Therefore, the signal-to-noise ratio of the NFC receiving circuit is improved, thereby solving the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
  • FIG. 1 is a schematic structural view of an NFC receiving circuit provided by the present invention.
  • FIG. 2 is a schematic structural view of another NFC receiving circuit provided by the present invention.
  • FIG. 3 is a schematic structural diagram of still another NFC receiving circuit provided by the present invention.
  • the present invention provides an NFC receiving circuit 10, as shown in FIG. 1, the NFC receiving circuit 10 may include a coupler 101, a control circuit 102, and a first amplifier 103;
  • the coupler 101 is for receiving and coupling an input signal.
  • the coupler 101 is a radio frequency coupler.
  • Control circuit 102 is operative to determine a control signal corresponding to the amplitude gain of the coupled input signal.
  • the input of the control circuit 102 is connected to the output of the coupler 101.
  • control circuit 102 can be configured to track and amplify the coupled input signal to obtain a track-amplified signal; determine an envelope of the tracked amplified signal; and determine an undulation of an envelope of the track-amplified signal.
  • the control circuit 102 is a low noise amplifier; 2.
  • the response frequency of the control circuit 102 is consistent with the reception frequency of the NFC receiving circuit. In this way, the effective amplification of the NFC received signal can be completed by the above NFC receiving circuit 10, and the signal-to-noise ratio of the receiving system can be improved. Therefore, preferably, the control circuit 102 is an envelope tracking (ET) envelope tracking circuit, and the output of the ET envelope tracking circuit, that is, the control signal is a control voltage.
  • ET envelope tracking
  • the first amplifier 103 is for amplifying the input signal in accordance with a control signal.
  • control terminal of the first amplifier 103 is connected to the output terminal of the control circuit 102, the input terminal of the first amplifier 103 is for receiving an input signal, and the output terminal of the first amplifier 103 is for outputting the amplified input signal.
  • the amplified input signal is output to the first amplifier and then input to the NFC chip.
  • the preferred first amplifier is a voltage controlled amplifier.
  • the embodiment uses ET technology with a voltage-controlled amplifier to track and amplify the coupled input signal to obtain an envelope. The maximum amplitude gain and the minimum gain of the envelope are larger, and then the amplitude gain adjustment control is performed according to the amplitude gain. The voltage value of the voltage, thereby objectively improving the signal-to-noise ratio of the circuit.
  • the input signal is first coupled by the coupler, and then the control circuit outputs a control signal, and the first amplifier is controlled to amplify the input signal according to the control signal, thereby achieving the purpose of increasing the input signal, and the control signal is Determined according to the tracked amplified and coupled input signal, that is, the control signal is changed according to the amplitude gain of the input signal.
  • the first amplifier changes the amplification factor according to the amplitude gain of the input signal. Therefore, the signal-to-noise ratio of the NFC receiving circuit is improved, thereby solving the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
  • the NFC receiving circuit further includes: an adjusting circuit 104, an input end of the adjusting circuit 104 is connected to an output end of the first amplifier 103, and the adjusting circuit 104 is configured to input the amplified input.
  • Signal detection and / or shaping Preferably, the adjustment circuit 104 is a detection shaping circuit.
  • the NFC receiving circuit further includes: a second amplifier 100, an output of the second amplifier 100 is connected to an input end of the coupler 101; and a second amplifier 100 is configured to receive and amplify the original Signal, get the input signal of the coupler.
  • the second amplifier 100 is a Low Noise Amplifier (LNA).
  • the original signal is an NFC radio frequency signal received by the NFC antenna; when there is no second amplifier 100, the input signal is an NFC radio frequency signal received by the NFC antenna, and when the second amplifier 100 is present, the input signal is amplified by the second amplifier 100.
  • the NFC antenna receives the NFC RF signal.
  • the working process of this embodiment includes: as shown in FIG. 3, the NFC receives the NFC radio frequency signal through the antenna, and the NFC radio frequency signal first amplifies the NFC radio frequency signal through the front end LNA300; a part of the amplified NFC radio frequency signal is coupled through the radio frequency coupler 301, and coupled The signal enters the ET envelope tracking circuit 302.
  • the ET envelope tracking circuit 302 provides a fitted control voltage based on the undulation of the envelope of the coupled signal.
  • a portion of the amplified NFC RF signal enters the voltage controlled amplifier 303; the voltage controlled amplifier 303 is based on the ET.
  • the control voltage control provided by the envelope tracking circuit 302 re-amplifies the NFC radio frequency signal; the re-amplified NFC radio frequency signal enters the detection shaping circuit 304, detects and shapes the overshoot and nonlinearity of the signal, outputs an output signal, and finally outputs an output signal. Input to the NFC chip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Disclosed is an NFC receive circuit. The NFC receive circuit comprises: a coupler, for receiving and coupling an input signal; a control circuit, for determining a control signal corresponding to amplitude gain of the coupled input signal, the input end of the control circuit being connected to the output end of the coupler; and a first amplifier of which the input end receives the input signal, for amplifying the input signal according to the control signal and outputting the amplified input signal through the output end, the control end of the first amplifier being connected to the output end of the control circuit.

Description

一种近场通信接收电路Near field communication receiving circuit 技术领域Technical field
本实用新型涉及近场通信(Near Field Communication，NFC)信号处理技术，尤其涉及一种NFC接收电路。The utility model relates to a Near Field Communication (NFC) signal processing technology, in particular to an NFC receiving circuit.
背景技术Background technique
NFC是一种非接触式识别和互联技术，可以在移动设备、消费类电子产品、台式电脑和智能控件工具间进行近距离无线通信。目前，13.56MHz的NFC技术在智能终端上得到广泛应用。NFC is a contactless identification and interconnect technology that enables close-range wireless communication between mobile devices, consumer electronics, desktop computers and smart control tools. At present, the 13.56 MHz NFC technology is widely used in smart terminals.
传统NFC天线占用空间较大，但随着智能终端的功能越来越多，智能终端的结构越来越紧凑，为NFC天线分配的空间也就会越来越小，因此，NFC天线的小型化成为了发展趋势。The traditional NFC antenna occupies a large space, but as the functions of the intelligent terminal become more and more, the structure of the intelligent terminal becomes more and more compact, and the space allocated for the NFC antenna is also smaller and smaller. Therefore, the NFC antenna is miniaturized. In order to develop trends.
但实现在NFC天线的小型化的同时，NFC接收电路并未改进，NFC天线的小型化将会导致NFC天线的接收功率降低，接收信号的能力降低；相应的，天线发送到NFC芯片的信号质量也就较差。因此，现有技术未能解决NFC在使用小天线时带来的天线接收功率不足的问题。However, while the NFC antenna is miniaturized, the NFC receiving circuit is not improved, and the miniaturization of the NFC antenna will result in a decrease in the receiving power of the NFC antenna and a decrease in the ability to receive signals; correspondingly, the signal quality of the antenna transmitted to the NFC chip. It is also poor. Therefore, the prior art fails to solve the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
实用新型内容Utility model content
为解决上述技术问题，本实用新型实施例期望提供一种NFC接收电路，能够解决NFC在使用小天线时带来的天线接收功率不足问题。In order to solve the above technical problem, the embodiment of the present invention is expected to provide an NFC receiving circuit, which can solve the problem of insufficient receiving power of the antenna when the NFC uses a small antenna.
本实用新型的技术方案是这样实现的：The technical solution of the utility model is realized as follows:
第一方面，提供一种近场通信NFC接收电路，所述NFC接收电路包括：In a first aspect, a near field communication NFC receiving circuit is provided, the NFC receiving circuit comprising:
接收并耦合输入信号的耦合器；a coupler that receives and couples the input signal;
确定与耦合后的输入信号的振幅增益相对应的控制信号的控制电路； 所述控制电路的输入端与所述耦合器的输出端相连；a control circuit that determines a control signal corresponding to an amplitude gain of the coupled input signal; An input end of the control circuit is connected to an output end of the coupler;
输入端接收所述输入信号，根据所述控制信号放大所述输入信号，并通过输出端输出放大后的输入信号的第一放大器；所述第一放大器的控制端与所述控制电路的输出端相连。The input end receives the input signal, amplifies the input signal according to the control signal, and outputs a first amplifier of the amplified input signal through an output terminal; a control end of the first amplifier and an output end of the control circuit Connected.
结合第一方面，在第一种可实现方式中，所述NFC接收电路还包括：With reference to the first aspect, in a first implementation manner, the NFC receiving circuit further includes:
对所述放大后的输入信号检波和/或整形的调整电路，所述调整电路的输入端与所述第一放大器的输出端相连接。An adjustment circuit for detecting and/or shaping the amplified input signal, an input of the adjustment circuit being coupled to an output of the first amplifier.
结合第一方面或第一种可实现方式，在第二种可实现方式中，所述NFC接收电路还包括：第二放大器；With reference to the first aspect or the first implementation manner, in a second implementation manner, the NFC receiving circuit further includes: a second amplifier;
所述第二放大器的输出端与所述耦合器的输入端相连，配置为接收并放大原始信号，得到所述输入信号。An output of the second amplifier is coupled to an input of the coupler and configured to receive and amplify an original signal to obtain the input signal.
结合第一方面，在第三种可实现方式中，所述控制电路为跟踪放大所述耦合后的输入信号得到跟踪放大后的信号，确定所述跟踪放大后的信号的包络，并确定与所述包络的起伏相对应的控制信号的控制电路。With reference to the first aspect, in a third implementation manner, the control circuit is configured to track and amplify the coupled input signal to obtain a track-amplified signal, determine an envelope of the track-amplified signal, and determine and A control circuit for the control signal corresponding to the undulation of the envelope.
结合第一方面，在第四种可实现方式中，所述控制电路是低噪放，所述控制电路的响应频率与所述NFC接收电路的接收频率保持一致。In combination with the first aspect, in a fourth implementation manner, the control circuit is a low noise amplifier, and a response frequency of the control circuit is consistent with a receiving frequency of the NFC receiving circuit.
结合第四种可实现方式，在第五种可实现方式中，所述控制电路是包络跟踪放大ET包络跟踪电路，所述ET包络跟踪电路的输出是控制电压。In conjunction with the fourth achievable manner, in a fifth implementation manner, the control circuit is an envelope tracking amplification ET envelope tracking circuit, and an output of the ET envelope tracking circuit is a control voltage.
结合第五种可实现方式，在第六种可实现方式中，所述第一放大器是压控放大器。In conjunction with a fifth implementation, in a sixth implementation, the first amplifier is a voltage controlled amplifier.
结合第一方面，在第七种可实现方式中，所述耦合器是射频耦合器。In conjunction with the first aspect, in a seventh implementation, the coupler is a radio frequency coupler.
结合第一种可实现方式，在第八种可实现方式中，所述调整电路是检波整形电路。In conjunction with the first achievable manner, in an eighth implementation manner, the adjustment circuit is a detection shaping circuit.
结合第二种可实现方式，在第九种可实现方式中，所述第二放大器是低噪声放大器LNA。 In conjunction with the second implementation, in a ninth implementation, the second amplifier is a low noise amplifier LNA.
本实用新型实施例提供了一种近距离无线通讯技术NFC接收电路，设置有耦合器、控制电路、以及第一放大器；通过耦合器接收并耦合输入信号；通过控制电路确定与耦合后的输入信号的振幅增益相对应的控制信号；之后采用第一放大器根据控制信号放大所述输入信号。这样一来，输入信号先经过耦合器的耦合，再经过控制电路输出控制信号，根据该控制信号控制第一放大器对输入信号进行放大，如此就达到了增大输入信号的目的；而且，控制信号是根据跟踪放大后且耦合后的输入信号而确定的，也就是说，控制信号是根据输入信号的振幅增益变化而变化的，第一放大器也就是按照输入信号的振幅增益变化而改变放大倍数的，因此，提高了NFC接收电路的信噪比，从而解决NFC在使用小天线时带来的天线接收功率不足问题。The embodiment of the present invention provides a short-range wireless communication technology NFC receiving circuit, which is provided with a coupler, a control circuit, and a first amplifier; receives and couples an input signal through a coupler; and determines and couples the input signal through the control circuit The amplitude gain corresponds to a control signal; the first amplifier is then used to amplify the input signal in accordance with the control signal. In this way, the input signal is first coupled by the coupler, and then the control circuit outputs a control signal, and the first amplifier is controlled to amplify the input signal according to the control signal, thereby achieving the purpose of increasing the input signal; and, the control signal It is determined according to the tracked amplified and coupled input signal, that is, the control signal changes according to the amplitude gain variation of the input signal, and the first amplifier changes the amplification factor according to the amplitude gain of the input signal. Therefore, the signal-to-noise ratio of the NFC receiving circuit is improved, thereby solving the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
附图说明DRAWINGS
图1为本实用新型提供的一种NFC接收电路的结构示意图；1 is a schematic structural view of an NFC receiving circuit provided by the present invention;
图2为本实用新型提供的另一种NFC接收电路的结构示意图；2 is a schematic structural view of another NFC receiving circuit provided by the present invention;
图3为本实用新型提供的再一种NFC接收电路的结构示意图。FIG. 3 is a schematic structural diagram of still another NFC receiving circuit provided by the present invention.
具体实施方式detailed description
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.
本实用新型提供一种NFC接收电路10，如图1所示，该NFC接收电路10可以包括：耦合器101、控制电路102、以及第一放大器103；其中，The present invention provides an NFC receiving circuit 10, as shown in FIG. 1, the NFC receiving circuit 10 may include a coupler 101, a control circuit 102, and a first amplifier 103;
耦合器101用于接收并耦合输入信号。The coupler 101 is for receiving and coupling an input signal.
优选的，耦合器101是射频耦合器。Preferably, the coupler 101 is a radio frequency coupler.
控制电路102用于确定与耦合后的输入信号的振幅增益相对应的控制信号。 Control circuit 102 is operative to determine a control signal corresponding to the amplitude gain of the coupled input signal.
这里，控制电路102的输入端与耦合器101的输出端相连。Here, the input of the control circuit 102 is connected to the output of the coupler 101.
具体的，控制电路102可用于跟踪放大所述耦合后的输入信号，得到跟踪放大后的信号；确定跟踪放大后的信号的包络；确定出与所述跟踪放大后的信号的包络的起伏相对应的控制信号；其中，控制信号可以为包络信号。Specifically, the control circuit 102 can be configured to track and amplify the coupled input signal to obtain a track-amplified signal; determine an envelope of the tracked amplified signal; and determine an undulation of an envelope of the track-amplified signal. Corresponding control signals; wherein the control signals can be envelope signals.
由于NFC接收信号的包络的波形是矩形方波，因此，第一放大器放大后的输入信号导的相位失真对最终的信号解调影响不大，但是，在第一放大器的选择原则为如下两点：1、控制电路102是低噪放；2、控制电路102的响应频率和NFC接收电路的接收频率保持一致。这样，就可以通过以上NFC接收电路10完成对NFC接收信号的有效放大，提高接收系统的信噪比。因此，优选的，控制电路102是包络跟踪(Envelope tracking，ET)包络跟踪电路，ET包络跟踪电路的输出即控制信号是控制电压。Since the waveform of the envelope of the NFC received signal is a rectangular square wave, the phase distortion of the amplified input signal of the first amplifier has little effect on the final signal demodulation, but the selection principle of the first amplifier is as follows Points: 1. The control circuit 102 is a low noise amplifier; 2. The response frequency of the control circuit 102 is consistent with the reception frequency of the NFC receiving circuit. In this way, the effective amplification of the NFC received signal can be completed by the above NFC receiving circuit 10, and the signal-to-noise ratio of the receiving system can be improved. Therefore, preferably, the control circuit 102 is an envelope tracking (ET) envelope tracking circuit, and the output of the ET envelope tracking circuit, that is, the control signal is a control voltage.
第一放大器103用于根据控制信号，放大所述输入信号。The first amplifier 103 is for amplifying the input signal in accordance with a control signal.
这里，第一放大器103的控制端与控制电路102的输出端相连，第一放大器103的输入端用于接收输入信号，第一放大器103的输出端用于输出放大后的输入信号。其中，放大后的输入信号输出第一放大器之后，输入NFC芯片。Here, the control terminal of the first amplifier 103 is connected to the output terminal of the control circuit 102, the input terminal of the first amplifier 103 is for receiving an input signal, and the output terminal of the first amplifier 103 is for outputting the amplified input signal. The amplified input signal is output to the first amplifier and then input to the NFC chip.
由于控制电路输出的是控制电压，因此，优选的第一放大器是压控放大器。这里，本实施例利用ET技术配合一个压控放大器，对耦合后的输入信号进行跟踪放大，得到包络，该包络的最大振幅增益和最小增益的差值较大，再根据振幅增益调整控制电压的压值，从而客观提高了电路的信噪比。这样一来，输入信号先经过耦合器的耦合，再经过控制电路输出控制信号，根据该控制信号控制第一放大器对输入信号进行放大，这样，达到了增大输入信号的目的，而且控制信号是根据跟踪放大后且耦合后的输入信号而确定的，也就是说，控制信号是根据输入信号的振幅增益变化而变 化的，第一放大器也就是按照输入信号的振幅增益变化而改变放大倍数的，因此，提高了NFC接收电路的信噪比，从而解决NFC在使用小天线时带来的天线接收功率不足问题。Since the control circuit outputs a control voltage, the preferred first amplifier is a voltage controlled amplifier. Here, the embodiment uses ET technology with a voltage-controlled amplifier to track and amplify the coupled input signal to obtain an envelope. The maximum amplitude gain and the minimum gain of the envelope are larger, and then the amplitude gain adjustment control is performed according to the amplitude gain. The voltage value of the voltage, thereby objectively improving the signal-to-noise ratio of the circuit. In this way, the input signal is first coupled by the coupler, and then the control circuit outputs a control signal, and the first amplifier is controlled to amplify the input signal according to the control signal, thereby achieving the purpose of increasing the input signal, and the control signal is Determined according to the tracked amplified and coupled input signal, that is, the control signal is changed according to the amplitude gain of the input signal. The first amplifier changes the amplification factor according to the amplitude gain of the input signal. Therefore, the signal-to-noise ratio of the NFC receiving circuit is improved, thereby solving the problem that the antenna receiving power is insufficient when the NFC uses a small antenna.
进一步的，如图2所示，所述NFC接收电路还包括：调整电路104，该调整电路104的输入端与第一放大器103的输出端相连接，该调整电路104用于对放大后的输入信号检波和/或整形。优选的，调整电路104是检波整形电路。Further, as shown in FIG. 2, the NFC receiving circuit further includes: an adjusting circuit 104, an input end of the adjusting circuit 104 is connected to an output end of the first amplifier 103, and the adjusting circuit 104 is configured to input the amplified input. Signal detection and / or shaping. Preferably, the adjustment circuit 104 is a detection shaping circuit.
进一步的，如图2所示，所述NFC接收电路还包括：第二放大器100，第二放大器100的输出端与所述耦合器101的输入端相连；第二放大器100用于接收并放大原始信号，得到耦合器的输入信号。优选的，第二放大器100是低噪声放大器(Low Noise Amplifier，LNA)。Further, as shown in FIG. 2, the NFC receiving circuit further includes: a second amplifier 100, an output of the second amplifier 100 is connected to an input end of the coupler 101; and a second amplifier 100 is configured to receive and amplify the original Signal, get the input signal of the coupler. Preferably, the second amplifier 100 is a Low Noise Amplifier (LNA).
这里，原始信号是NFC天线接收的NFC射频信号；当没有第二放大器100时，输入信号就是NFC天线接收的NFC射频信号，当存在第二放大器100时，输入信号就是经过第二放大器100放大后的NFC天线接收的NFC射频信号。Here, the original signal is an NFC radio frequency signal received by the NFC antenna; when there is no second amplifier 100, the input signal is an NFC radio frequency signal received by the NFC antenna, and when the second amplifier 100 is present, the input signal is amplified by the second amplifier 100. The NFC antenna receives the NFC RF signal.
本实施例的工作流程包括：如图3所示，NFC通过天线接收NFC射频信号，NFC射频信号首先经过前端LNA300放大NFC射频信号；一部分放大的NFC射频信号通过射频耦合器301耦合，耦合后的信号进入ET包络跟踪电路302，ET包络跟踪电路302根据耦合后的信号的包络的起伏提供拟合的控制电压，一部分放大的NFC射频信号进入压控放大器303；压控放大器303根据ET包络跟踪电路302提供的控制电压控制再次放大NFC射频信号；再次放大的NFC射频信号进入到检波整形电路304，对信号的过冲和非线性进行检波和整形，输出输出信号，最终将输出信号输入到NFC芯片。The working process of this embodiment includes: as shown in FIG. 3, the NFC receives the NFC radio frequency signal through the antenna, and the NFC radio frequency signal first amplifies the NFC radio frequency signal through the front end LNA300; a part of the amplified NFC radio frequency signal is coupled through the radio frequency coupler 301, and coupled The signal enters the ET envelope tracking circuit 302. The ET envelope tracking circuit 302 provides a fitted control voltage based on the undulation of the envelope of the coupled signal. A portion of the amplified NFC RF signal enters the voltage controlled amplifier 303; the voltage controlled amplifier 303 is based on the ET. The control voltage control provided by the envelope tracking circuit 302 re-amplifies the NFC radio frequency signal; the re-amplified NFC radio frequency signal enters the detection shaping circuit 304, detects and shapes the overshoot and nonlinearity of the signal, outputs an output signal, and finally outputs an output signal. Input to the NFC chip.
以上所述，仅为本实用新型的较佳实施例而已，并非用于限定本实用 新型的保护范围。 The above description is only a preferred embodiment of the present invention, and is not intended to limit the utility. New range of protection.

Claims (10)

  1. 一种近场通信NFC接收电路，所述NFC接收电路包括：A near field communication NFC receiving circuit, the NFC receiving circuit comprising:
    接收并耦合输入信号的耦合器；a coupler that receives and couples the input signal;
    确定与耦合后的输入信号的振幅增益相对应的控制信号的控制电路；所述控制电路的输入端与所述耦合器的输出端相连；a control circuit for determining a control signal corresponding to an amplitude gain of the coupled input signal; an input of the control circuit coupled to an output of the coupler;
    输入端接收所述输入信号，根据所述控制信号放大所述输入信号，并通过输出端输出放大后的输入信号的第一放大器；所述第一放大器的控制端与所述控制电路的输出端相连。The input end receives the input signal, amplifies the input signal according to the control signal, and outputs a first amplifier of the amplified input signal through an output terminal; a control end of the first amplifier and an output end of the control circuit Connected.
  2. 根据权利要求1所述的NFC接收电路，其中，所述NFC接收电路还包括：The NFC receiving circuit of claim 1, wherein the NFC receiving circuit further comprises:
    对所述放大后的输入信号检波和/或整形的调整电路，所述调整电路的输入端与所述第一放大器的输出端相连接。An adjustment circuit for detecting and/or shaping the amplified input signal, an input of the adjustment circuit being coupled to an output of the first amplifier.
  3. 根据权利要求1或2所述的NFC接收电路，其中，所述NFC接收电路还包括：第二放大器；The NFC receiving circuit according to claim 1 or 2, wherein the NFC receiving circuit further comprises: a second amplifier;
    所述第二放大器的输出端与所述耦合器的输入端相连，配置为接收并放大原始信号，得到所述输入信号。An output of the second amplifier is coupled to an input of the coupler and configured to receive and amplify an original signal to obtain the input signal.
  4. 根据权利要求1所述的NFC接收电路，其中，所述控制电路为跟踪放大所述耦合后的输入信号得到跟踪放大后的信号，确定所述跟踪放大后的信号的包络，并确定与所述包络的起伏相对应的控制信号的控制电路。The NFC receiving circuit according to claim 1, wherein the control circuit is configured to track and amplify the coupled input signal to obtain a track-amplified signal, determine an envelope of the track-amplified signal, and determine and A control circuit for the control signal corresponding to the fluctuation of the envelope.
  5. 根据权利要求1所述的NFC接收电路，其中，所述控制电路是低噪放，所述控制电路的响应频率与所述NFC接收电路的接收频率保持一致。The NFC receiving circuit according to claim 1, wherein said control circuit is a low noise amplifier, and a response frequency of said control circuit is consistent with a receiving frequency of said NFC receiving circuit.
  6. 根据权利要求5所述的NFC接收电路，其中，所述控制电路是包络跟踪放大ET包络跟踪电路，所述ET包络跟踪电路的输出是控制电压。The NFC receiving circuit according to claim 5, wherein said control circuit is an envelope tracking amplification ET envelope tracking circuit, and an output of said ET envelope tracking circuit is a control voltage.
  7. 根据权利要求6所述的NFC接收电路，其中，所述第一放大器是压控放大器。 The NFC receiving circuit of claim 6 wherein said first amplifier is a voltage controlled amplifier.
  8. 根据权利要求1所述的NFC接收电路，其中，所述耦合器是射频耦合器。The NFC receiving circuit of claim 1 wherein said coupler is a radio frequency coupler.
  9. 根据权利要求2所述的NFC接收电路，其中，所述调整电路是检波整形电路。The NFC receiving circuit according to claim 2, wherein said adjusting circuit is a detecting shaping circuit.
  10. 根据权利要求3所述的NFC接收电路，其中，所述第二放大器是低噪声放大器LNA。 The NFC receiving circuit according to claim 3, wherein said second amplifier is a low noise amplifier LNA.
PCT/CN2015/090009 2015-07-23 2015-09-18 Near field communication receive circuit WO2017012188A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201520539839.2U CN204993318U (en) 2015-07-23 2015-07-23 Near field communications received circuit
CN201520539839.2 2015-07-23

Publications (1)

Publication Number Publication Date
WO2017012188A1 true WO2017012188A1 (en) 2017-01-26

Family

ID=55127637

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/090009 WO2017012188A1 (en) 2015-07-23 2015-09-18 Near field communication receive circuit

Country Status (2)

Country Link
CN (1) CN204993318U (en)
WO (1) WO2017012188A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018171723A1 (en) * 2017-03-24 2018-09-27 深圳市文鼎创数据科技有限公司 Near field communication front-end hardware circuit, terminal, reader/writer, system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080233871A1 (en) * 2007-03-19 2008-09-25 Ahmadreza Rofougaran Method and System For Bluetooth, Near Field Communication And Simultaneous FM Transmission and Reception Functions
US20100237943A1 (en) * 2009-03-23 2010-09-23 Samsung Electronics Co., Ltd. Auto gain controllers, and communication terminals having the same
US20130070750A1 (en) * 2011-09-15 2013-03-21 Electronics And Telecommunications Research Institute Method and apparatus for acquiring reception synchronization in local wireless communication system
CN103312363A (en) * 2012-03-12 2013-09-18 美国博通公司 Near field communications (nfc) device having adjustable gain
CN104734751A (en) * 2013-09-04 2015-06-24 联发科技（新加坡）私人有限公司 Short-distance contactless communication apparatus and method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080233871A1 (en) * 2007-03-19 2008-09-25 Ahmadreza Rofougaran Method and System For Bluetooth, Near Field Communication And Simultaneous FM Transmission and Reception Functions
US20100237943A1 (en) * 2009-03-23 2010-09-23 Samsung Electronics Co., Ltd. Auto gain controllers, and communication terminals having the same
US20130070750A1 (en) * 2011-09-15 2013-03-21 Electronics And Telecommunications Research Institute Method and apparatus for acquiring reception synchronization in local wireless communication system
CN103312363A (en) * 2012-03-12 2013-09-18 美国博通公司 Near field communications (nfc) device having adjustable gain
CN104734751A (en) * 2013-09-04 2015-06-24 联发科技（新加坡）私人有限公司 Short-distance contactless communication apparatus and method thereof

Also Published As

Publication number Publication date
CN204993318U (en) 2016-01-20

Similar Documents

Publication Publication Date Title
CN103391049B (en) The low-noise amplifier of gain adjustable
CN104113352B (en) Have and offset the transformer of self-interference signal function and the ultrahigh frequency RFID receiver front end based on this transformer
US20130303091A1 (en) Method and apparatus for transmitting and receiving high frequency
CN103427858A (en) Automatic gain control device and method, radio frequency receiver chip and radio frequency receiving machine
CN204517760U (en) A kind of Big Dipper B3 band low noise amplifier circuit
US9413431B2 (en) Transceiver
WO2017012188A1 (en) Near field communication receive circuit
RU2689415C1 (en) Apparatus and method for improving an nfc channel by applying surface waves
CN213637763U (en) Micro microwave induction antenna
CN104158504A (en) Broadband low-noise amplifier
CN103516313A (en) Low-noise amplifiers for radio frequency receiver
CN103888169A (en) Gain control method for ultra short wave reception channel
CN203661047U (en) A 2.4G direct down conversion receiver radio frequency front end device
CN104269660A (en) Broadband receiving antenna with active antenna and passive antenna switching function
CN201846316U (en) Automatic gain control circuit of zero intermediate frequency receiver
KR20080107915A (en) Radio frequency identification receiving device
JP2015146537A (en) Transmission circuit for millimeter wave transmitter
CN204794914U (en) Radio frequency power amplifier wave filter subassembly
CN203039644U (en) Beidou and GPS (global positioning system) low-noise amplifier
CN204088581U (en) There is the broad-band reception antenna of active antenna and passive antenna handoff functionality
CN203086412U (en) Impulse power amplifier
JP2015106906A (en) Wireless receiver
CN112491482B (en) Micro microwave induction antenna
TWI714974B (en) Signal receiving circuit and wireless communication system
CN207181669U (en) A kind of 3mm microwave low noise amplifiers

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15898744

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15898744

Country of ref document: EP

Kind code of ref document: A1