CN204993318U - Near field communications received circuit - Google Patents
Near field communications received circuit Download PDFInfo
- Publication number
- CN204993318U CN204993318U CN201520539839.2U CN201520539839U CN204993318U CN 204993318 U CN204993318 U CN 204993318U CN 201520539839 U CN201520539839 U CN 201520539839U CN 204993318 U CN204993318 U CN 204993318U
- Authority
- CN
- China
- Prior art keywords
- amplifier
- signal
- circuit
- receiving circuit
- nfc
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The embodiment of the utility model discloses NFC receiving circuit, NFC receiving circuit includes: receive coupling incoming signal's coupler, confirm with the coupling after the corresponding control signal's of incoming signal's amplitude gain control circuit, control circuit's input with the output of coupler links to each other, the input is received incoming signal, according to control signal enlargies incoming signal to incoming signal's after enlargeing through output first amplifier, the control end of first amplifier with control circuit's output links to each other.
Description
Technical field
The utility model relates to near-field communication (NearFieldCommunication, NFC) signal processing technology, particularly relates to a kind of NFC receiving circuit.
Background technology
NFC is a kind of non contact angle measurement and interconnection technique, can carry out wireless near field communication at mobile device, consumer electronics product, desktop computer and smart control Tool Room.At present, the NFC technique of 13.56MHz is used widely on intelligent terminal.
Tradition NFC antenna takes up room comparatively large, but gets more and more along with the function of intelligent terminal, and the structure of intelligent terminal is more and more compacter, and the space distributed for NFC antenna also will be more and more less, and therefore, the miniaturization of NFC antenna becomes development trend.
But realize while the miniaturization of NFC antenna, NFC receiving circuit does not improve, and the miniaturization of NFC antenna will cause the received power of NFC antenna to reduce, the ability of Received signal strength reduces; Accordingly, the antenna signal quality that is sent to NFC chip is also just poor.Therefore, prior art fails to solve the problem of antenna received power deficiency that NFC brings when using miniature antenna.
Utility model content
For solving the problems of the technologies described above, the utility model embodiment is expected to provide a kind of NFC receiving circuit, can solve the not enough problem of antenna received power that NFC brings when using miniature antenna.
The technical solution of the utility model is achieved in that
First aspect, provide a kind of near-field communication NFC receiving circuit, described NFC receiving circuit comprises:
Receive and the coupler of the input signal that is coupled;
Determine the control circuit of the control signal corresponding with the amplitude gain of the input signal after coupling; The input of described control circuit is connected with the output of described coupler;
Input receives described input signal, amplifies described input signal according to described control signal, and exports the first amplifier of the input signal after amplifying by output; The control end of described first amplifier is connected with the output of described control circuit.
In conjunction with first aspect, can in implementation at the first, described NFC receiving circuit also comprises:
To the Circuit tuning of the input signal detection after described amplification and/or shaping, the input of described Circuit tuning is connected with the output of described first amplifier.
Can implementation in conjunction with first aspect or the first, can in implementation at the second, described NFC receiving circuit also comprises:
Receive and amplify primary signal, obtaining the second amplifier of described input signal, the output of described second amplifier is connected with the input of described coupler.
In conjunction with first aspect, can in implementation at the third, described control circuit is follow the tracks of the input signal after amplifying described coupling to obtain following the tracks of the signal after amplifying, and determines the described envelope following the tracks of the signal after amplifying, and determines the control circuit of the control signal corresponding with the fluctuating of described envelope.
In conjunction with first aspect, can in implementation at the 4th kind, described control circuit is the first low noise amplifier, and the response frequency of described control circuit and the receive frequency of described NFC receiving circuit are consistent.
Can implementation in conjunction with the 4th kind, can in implementation at the 5th kind, described control circuit is that envelope-tracking amplifies ET envelope-tracking circuit, and the output of described ET envelope-tracking circuit is control voltage.
Can implementation in conjunction with the 5th kind, can in implementation at the 6th kind, described first amplifier is voltage-controlled amplifier.
In conjunction with first aspect, can in implementation at the 7th kind, described coupler is radio-frequency (RF) coupler.
Can implementation in conjunction with the first, can in implementation at the 8th kind, described Circuit tuning is detection shaping circuit.
Can implementation in conjunction with the second, can in implementation at the 9th kind, described second amplifier is low noise amplifier LNA.
The utility model embodiment provides a kind of near field communication (NFC) NFC receiving circuit, is provided with coupler, control circuit and the first amplifier; Received by coupler and the input signal that is coupled; The control signal corresponding with the amplitude gain of the input signal after coupling is determined by control circuit; The first amplifier is adopted to amplify described input signal according to control signal afterwards.So, input signal first through the coupling of coupler, then exports control signal through control circuit, controls the first amplifier amplify input signal according to this control signal, so just reaches the object increasing input signal; And, control signal is amplified rear and after coupling input signal according to tracking and is determined, that is, control signal changes according to the amplitude gain of input signal and changes, first amplifier namely changes multiplication factor according to the amplitude gain change of input signal, this improves the signal to noise ratio of NFC receiving circuit, thus the not enough problem of antenna received power that solution NFC brings when using miniature antenna.
Accompanying drawing explanation
The structural representation of a kind of NFC receiving circuit that Fig. 1 provides for the utility model;
The structural representation of the another kind of NFC receiving circuit that Fig. 2 provides for the utility model;
The structural representation of another NFC receiving circuit that Fig. 3 provides for the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
The utility model provides a kind of NFC receiving circuit 10, and as shown in Figure 1, this NFC receiving circuit 10 can comprise: coupler 101, control circuit 102 and the first amplifier 103; Wherein,
Coupler 101 is for receiving and the input signal that is coupled.
Preferably, coupler 101 is radio-frequency (RF) coupler.
Control circuit 102 is for determining the control signal corresponding with the amplitude gain of the input signal after coupling.
Here, the input of control circuit 102 is connected with the output of coupler 101.
Concrete, control circuit 102 can be used for following the tracks of the input signal after amplifying described coupling, obtains following the tracks of the signal after amplifying; Determine the envelope following the tracks of the signal after amplifying; Determine the control signal corresponding with the described fluctuating following the tracks of the envelope of the signal after amplifying; Wherein, control signal can be envelope signal.
Waveform due to the envelope of NFC Received signal strength is rectangle square wave, therefore, the phase distortion that input signal after first amplifier amplifies is led is little on the impact of final signal receiving, but, be following 2 points in the selection principle of the first amplifier: 1, control circuit 102 is first low noise amplifiers; 2, the response frequency of control circuit 102 and the receive frequency of NFC receiving circuit are consistent.Like this, just can complete effective amplification to NFC Received signal strength by above NFC receiving circuit 10, improve the signal to noise ratio of receiving system.Therefore, preferably, control circuit 102 is envelope-tracking (Envelopetracking, ET) envelope-tracking circuit, and output and the control signal of ET envelope-tracking circuit are control voltages.
First amplifier 103, for according to control signal, amplifies described input signal.
Here, the control end of the first amplifier 103 is connected with the output of control circuit 102, and the input of the first amplifier 103 is for receiving input signal, and the output of the first amplifier 103 is for exporting the input signal after amplification.Wherein, after the input signal after amplification exports the first amplifier, input NFC chip.
Due to control circuit output is control voltage, and therefore, preferred first amplifier is voltage-controlled amplifier.Here, the present embodiment utilizes ET technology to coordinate a voltage-controlled amplifier, carry out tracking to the input signal after coupling to amplify, obtain envelope, the peak swing gain of this envelope and the difference of least gain larger, again according to the pressure value of amplitude gain adjustment control voltage, thus the objective signal to noise ratio that improve circuit.So, input signal is first through the coupling of coupler, control signal is exported again through control circuit, control the first amplifier according to this control signal to amplify input signal, like this, reach the object increasing input signal, and control signal according to follow the tracks of amplify after and coupling after input signal determine, that is, control signal changes according to the amplitude gain of input signal and changes, first amplifier namely changes multiplication factor according to the amplitude gain change of input signal, therefore, improve the signal to noise ratio of NFC receiving circuit, thus the not enough problem of antenna received power that solution NFC brings when using miniature antenna.
Further, as shown in Figure 2, described NFC receiving circuit also comprises: Circuit tuning 104, and the input of this Circuit tuning 104 is connected with the output of the first amplifier 103, this Circuit tuning 104 for amplify after input signal detection and/or shaping.Preferably, Circuit tuning 104 is detection shaping circuits.
Further, as shown in Figure 2, described NFC receiving circuit also comprises: the output of the second amplifier 100, second amplifier 100 is connected with the input of described coupler 101; Second amplifier 100, for receiving and amplifying primary signal, obtains the input signal of coupler.Preferably, the second amplifier 100 is low noise amplifier (LowNoiseAmplifier, LNA).
Here, primary signal is the NFC radiofrequency signal that NFC antenna receives; When not having the second amplifier 100, input signal is exactly the NFC radiofrequency signal that NFC antenna receives, when existence the second amplifier 100, and the NFC radiofrequency signal that the NFC antenna after input signal is just through the second amplifier 100 amplification receives.
The workflow of the present embodiment comprises: as shown in Figure 3, and NFC receives NFC radiofrequency signal by antenna, and first NFC radiofrequency signal amplifies NFC radiofrequency signal through front end LNA300; The NFC radiofrequency signal that a part is amplified is coupled by radio-frequency (RF) coupler 301, signal after coupling enters ET envelope-tracking circuit 302, ET envelope-tracking circuit 302 provides the control voltage of matching according to the fluctuating of the envelope of the signal after coupling, and the NFC radiofrequency signal that a part is amplified enters voltage-controlled amplifier 303; Voltage-controlled amplifier 303 controls again to amplify NFC radiofrequency signal according to the control voltage that ET envelope-tracking circuit 302 provides; The NFC radiofrequency signal of again amplifying enters into detection shaping circuit 304, to the overshoot of signal with non-linearly carry out detection and shaping, output signal output, is input to NFC chip the most at last.
The above, be only preferred embodiment of the present utility model, is not intended to limit protection range of the present utility model.
Claims (10)
1. a near-field communication NFC receiving circuit, is characterized in that, described NFC receiving circuit comprises:
Receive and the coupler of the input signal that is coupled;
Determine the control circuit of the control signal corresponding with the amplitude gain of the input signal after coupling; The input of described control circuit is connected with the output of described coupler;
Input receives described input signal, amplifies described input signal according to described control signal, and exports the first amplifier of the input signal after amplifying by output; The control end of described first amplifier is connected with the output of described control circuit.
2. NFC receiving circuit according to claim 1, is characterized in that, described NFC receiving circuit also comprises:
To the Circuit tuning of the input signal detection after described amplification and/or shaping, the input of described Circuit tuning is connected with the output of described first amplifier.
3. NFC receiving circuit according to claim 1 and 2, is characterized in that, described NFC receiving circuit also comprises:
Receive and amplify primary signal, obtaining the second amplifier of described input signal, the output of described second amplifier is connected with the input of described coupler.
4. NFC receiving circuit according to claim 1, it is characterized in that, described control circuit is follow the tracks of the input signal after amplifying described coupling to obtain following the tracks of the signal after amplifying, determine the described envelope following the tracks of the signal after amplifying, and determine the control circuit of the control signal corresponding with the fluctuating of described envelope.
5. NFC receiving circuit according to claim 1, is characterized in that, described control circuit is low noise amplifier, and the response frequency of described control circuit and the receive frequency of described NFC receiving circuit are consistent.
6. NFC receiving circuit according to claim 5, is characterized in that, described control circuit is that envelope-tracking amplifies ET envelope-tracking circuit, and the output of described ET envelope-tracking circuit is control voltage.
7. NFC receiving circuit according to claim 6, is characterized in that, described first amplifier is voltage-controlled amplifier.
8. NFC receiving circuit according to claim 1, is characterized in that, described coupler is radio-frequency (RF) coupler.
9. NFC receiving circuit according to claim 2, is characterized in that, described Circuit tuning is detection shaping circuit.
10. NFC receiving circuit according to claim 3, is characterized in that, described second amplifier is low noise amplifier LNA.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520539839.2U CN204993318U (en) | 2015-07-23 | 2015-07-23 | Near field communications received circuit |
| PCT/CN2015/090009 WO2017012188A1 (en) | 2015-07-23 | 2015-09-18 | Near field communication receive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520539839.2U CN204993318U (en) | 2015-07-23 | 2015-07-23 | Near field communications received circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204993318U true CN204993318U (en) | 2016-01-20 |
Family
ID=55127637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520539839.2U Active CN204993318U (en) | 2015-07-23 | 2015-07-23 | Near field communications received circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN204993318U (en) |
| WO (1) | WO2017012188A1 (en) |
Cited By (1)
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7683851B2 (en) * | 2007-03-19 | 2010-03-23 | Broadcom Corporation | Method and system for using a single transformer for FM transmit and FM receive functions |
| KR101544859B1 (en) * | 2009-03-23 | 2015-08-17 | 삼성전자주식회사 | Auto gain controller and communication terminal having the same |
| KR101656083B1 (en) * | 2011-09-15 | 2016-09-09 | 한국전자통신연구원 | Apparatus and method for obtaining reception synchronization in wireless communication system |
| US9184798B2 (en) * | 2012-03-12 | 2015-11-10 | Broadcom Corporation | Near field communications (NFC) device having adjustable gain |
| US9608797B2 (en) * | 2013-09-04 | 2017-03-28 | Mediatek Singapore Pte. Ltd. | Adaptive envelope extracting apparatus, signal decoding apparatus and short-distance contactless communication apparatus applying the adaptive envelope extracting apparatus, and method thereof |
-
2015
- 2015-07-23 CN CN201520539839.2U patent/CN204993318U/en active Active
- 2015-09-18 WO PCT/CN2015/090009 patent/WO2017012188A1/en active Application Filing
Cited By (1)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017012188A1 (en) | 2017-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104113352A (en) | Transformer with self interference signal offsetting function and ultrahigh frequency radio frequency identification device (RFID) receiver front end based on same | |
| CN103391049A (en) | Variable-gain low noise amplifier | |
| CN102244500B (en) | Method and device for controlling power supplying voltage of power consumption device in emitting passage and emitting system | |
| CN101807886B (en) | Radio frequency power amplifying device and analog predistortion correction method thereof | |
| CN204517760U (en) | A kind of Big Dipper B3 band low noise amplifier circuit | |
| CN204993318U (en) | Near field communications received circuit | |
| CN206060732U (en) | A kind of wide dynamic range AFE (analog front end) | |
| CN218829866U (en) | Radio frequency power amplifier and radio frequency chip | |
| CN103675765B (en) | High-frequency software radio receiving system | |
| CN204376883U (en) | A kind of miniaturized receiver circuit | |
| CN204046526U (en) | Radio-frequency power amplifier | |
| CN104579407A (en) | Wireless communication device | |
| CN204206115U (en) | A kind of amplifying circuit for wireless short wave transmitting antenna | |
| CN213637763U (en) | Micro microwave induction antenna | |
| CN205051656U (en) | Microphone amplification circuit | |
| CN203301469U (en) | Short wave TR assemble | |
| CN106656082A (en) | Multistage amplifier circuit | |
| CN203313168U (en) | Signal sending device and signal receiving device used for wireless communication | |
| CN106330113B (en) | A kind of power amplifier | |
| CN204794914U (en) | Radio frequency power amplifier wave filter subassembly | |
| CN218633921U (en) | Microwave receiving module with VGC control function | |
| CN203747757U (en) | Front end amplification assembly of radio frequency receiver | |
| CN203645659U (en) | Long-range RF transceiving device based on DSSS technology | |
| CN204088581U (en) | There is the broad-band reception antenna of active antenna and passive antenna handoff functionality | |
| CN204556835U (en) | A kind of logarithmic amplifying circuit being applied to Tacan uphole equipment receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |