CN201781540U - Fixed wireless telephone with FM (frequency modulation) function - Google Patents

Fixed wireless telephone with FM (frequency modulation) function Download PDF

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Publication number
CN201781540U
CN201781540U CN2010202950379U CN201020295037U CN201781540U CN 201781540 U CN201781540 U CN 201781540U CN 2010202950379 U CN2010202950379 U CN 2010202950379U CN 201020295037 U CN201020295037 U CN 201020295037U CN 201781540 U CN201781540 U CN 201781540U
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CN
China
Prior art keywords
function
leads
access point
electric capacity
handle
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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.)
Expired - Lifetime
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CN2010202950379U
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Chinese (zh)
Inventor
况贤良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Priority to CN2010202950379U priority Critical patent/CN201781540U/en
Application granted granted Critical
Publication of CN201781540U publication Critical patent/CN201781540U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to the field of a fixed wireless telephone, and particularly discloses a fixed wireless telephone with an FM (frequency modulation) function. An FM aerial signal access point is arranged on one lead in four leads connected between a baseband chip and a handle; a first magnetic bead is connected between the FM aerial signal access point and the output terminal of the baseband chip in series; an FM frequency selection circuit is lapped on the FM aerial signal access point; and the FM frequency selection circuit is connected with an FM chip. The fixed wireless telephone with the FM function has the advantages that a handle cord of the fixed wireless telephone serves as an FM antenna, and the corresponding frequency selection circuit is added, so that not only the cost can be saved and the external appearance of the fixed wireless telephone can be kept, but also the antenna has a good receptivity.

Description

A kind of fixed CDMA WLL with the FM function
Technical field
The utility model relates to the fixed CDMA WLL field, and in particular a kind of handle rope with fixed CDMA WLL is done the fixed CDMA WLL of the method and the band FM function of FM antenna.
Background technology
Along with development of Communication Technique, the use of fixed CDMA WLL is more and more universal.At present, the application of FM function of radio receiver on fixed CDMA WLL is also of common occurrence, but increase the telescopic antenna of a FM separately for the fixed CDMA WLL of band FM function, not only make fixed CDMA WLL seem (because the antenna of a fixed CDMA WLL has been arranged) not attractive in appearance, also increased cost simultaneously.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of fixed CDMA WLL with the FM function, and it is simple in structure, and cost of manufacture is low, and can obtain good FM receptivity simultaneously.
The technical scheme that the utility model technical solution problem is adopted is as follows:
A kind of fixed CDMA WLL with the FM function, comprise FM frequency modulation chip, baseband chip, and handle, described handle is connected with described baseband chip by four leads in the handle rope, wherein, wherein lead in four leads that described baseband chip is connected with described handle is provided with a FM aerial signal access point, and between described FM aerial signal access point and described baseband chip output, be serially connected with first magnetic bead, and on FM aerial signal access point, being overlapped with a FM frequency selection circuit, described FM frequency selection circuit is connected with described FM frequency modulation chip.
The fixed CDMA WLL of described band FM function, it is characterized in that, four leads of described handle rope comprise two leads that connect transmitter and two leads that are connected receiver, and described FM aerial signal access point is arranged on the lead in two leads of connection receiver FM aerial signal access point is set.
The fixed CDMA WLL of described band FM function wherein, is serially connected with second magnetic bead, the 3rd magnetic bead and the 4th magnetic bead respectively on other three leads in four leads that described baseband chip is connected with described handle.
The fixed CDMA WLL of described band FM function, wherein, described first magnetic bead is 2500 ohm a magnetic bead.
The fixed CDMA WLL of described band FM function, wherein, the FM frequency selection circuit comprises first electric capacity, second electric capacity, the 3rd electric capacity and an inductance, first end of described first electric capacity is connected with described FM aerial signal access point, and second end of described first electric capacity is connected with described FM frequency modulation chip by described inductance;
And first end of described first electric capacity also connects with reference to ground by described second electric capacity, and second end of described first electric capacity connects with reference to ground by described the 3rd electric capacity.
The fixed CDMA WLL of described band FM function, wherein, it is the chip of RDA5802E that described FM frequency modulation chip adopts a model.
The fixed CDMA WLL of band FM function provided by the utility model, make the FM antenna owing to adopt the handle rope of fixed CDMA WLL, and increase corresponding frequency selection circuit, and not only can save cost, keep the fixed CDMA WLL outward appearance, can also make antenna reach a good receptivity.
Description of drawings
Fig. 1 is the fixed CDMA WLL circuit theory diagrams of the band FM function of the utility model embodiment;
Fig. 2 is the method flow diagram that the handle rope with fixed CDMA WLL of the utility model embodiment is made the FM antenna.
Embodiment
The fixed CDMA WLL of band FM function provided by the utility model uses handle rope to make the FM antenna.The FM bandwidth between 88MHz~108MHz, center frequency point f 0Be 98MHz, and wavelength X=c/f 0C is the light velocity 3 * 10 8M/s.Calculating can get the wavelength X=3.06m of center frequency point.And the length of general handle rope is 3m, and is spiral helicine, and the length after the bending is generally 0.5m, and it is feasible making the FM antenna.For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
A kind of fixed CDMA WLL of the utility model embodiment with the FM function, as shown in Figure 1, comprise FM frequency modulation chip 100, baseband chip 200, and handle 300, described handle 300 is connected with described baseband chip 200 with 304 by four leads 301,302,303 in the handle rope, wherein, described handle 300 comprises receiver 320 and transmitter 310, handle rope is the lead that connects between handle and base band BB, and four leads of described handle rope comprise two leads 303,304 that connect transmitter 310 and two leads 301,302 that are connected receiver 320.
When physical circuit is realized can selection in described baseband chip 200 and four leads that described handle 300 is connected wherein a lead make the FM antenna: FM ANT.And do in this selection on the lead of FM antenna a FM aerial signal access point 101 is set, embodiment as shown in Figure 1 is provided with FM aerial signal access point 101 on the lead 302 in two leads that connect receiver 320.And between described FM aerial signal access point 101 and described baseband chip 200 outputs, be serially connected with the first magnetic bead L3 that the high-frequency noise that is used to suppress on holding wire, the power line and spike disturb, and on FM aerial signal access point 101, being overlapped with a FM frequency selection circuit 110, described FM frequency selection circuit 110 is connected with described FM frequency modulation chip 100.
Preferably embodiment as shown in Figure 1,2500 ohm magnetic bead of string is the first magnetic bead L3 on the lead 302 between baseband chip 200 audio outputs and the receiver 320, be used to stop the baseband chip 200 of FM signal flow to FM aerial signal access point 101 left sides, make the frequency selection circuit 110 of FM signal flow, can stop the FM frequency selection circuit 110 that flows to the right from the interference signal of baseband chip 200 simultaneously to FM aerial signal access point 101 the right.
As shown in Figure 1, described FM frequency selection circuit 110 comprises first capacitor C 77, second capacitor C 78, the 3rd capacitor C 6 and an inductance L 8, first end 1 of described first capacitor C 77 is connected with described FM aerial signal access point 101, and second end 2 of described first capacitor C 77 is connected with described FM frequency modulation chip 100 by described inductance L 8;
And first end 1 of described first capacitor C 77 also connects with reference to ground by described second capacitor C 78, and second end 2 of described first capacitor C 77 also connects with reference to ground by described the 3rd capacitor C 6.
Preferably, described FM frequency modulation chip 100 employings one model is the chip of RDA5802E.Like this, the built-in 50PF electric capacity of the 3rd capacitor C 6, first capacitor C 77, second capacitor C 78, inductance L 8 and FM frequency modulation chip RDA5802E is formed the frequency selection circuit of FM.Wherein said C6, C77, C78, L8 numerical value can adjust according to different FM chips.
In order further to improve the FM signal receiving sensitivity, as shown in Figure 1, on other three leads 301,303 and 304 in described baseband chip 200 and four leads 301,302,303 and 304 that described handle 300 is connected, be serially connected with the second magnetic bead L6, the 3rd magnetic bead L7 and the 4th magnetic bead L9 respectively.Because four leads of handle rope are parallel, if do not add magnetic bead, the interference signal from baseband chip 200 will be coupled on this root lead 302 of FM ANT so, thereby influences the FM signal receiving sensitivity.
Therefore, use handle rope to make the FM antenna among the utility model embodiment, and increase frequency selection circuit, not only can save cost, keep the fixed CDMA WLL outward appearance, can also make the FM antenna reach a good receptivity.Handle rope is made the FM antenna in the specific embodiment, main two parts circuit that increases, as shown in Figure 1, a part is 2500 ohm magnetic bead L3, be in order to stop the baseband chip 200 of FM signal flow to the left side, make the FM signal flow to the FM on the right frequency selection circuit 110, stop the frequency selection circuit 110 that flows to FM from the interference signal of baseband chip 200 simultaneously, another part is C77, C78, C6, L8, is connected FM frequency modulation chip, the fixed CDMA WLL of realization the utility model band FM function with frequency selection circuit 110 that the built-in 50PF electric capacity of RDA5802E is formed.
Based on the fixed CDMA WLL of above-mentioned band FM function, the utility model embodiment also provides a kind of handle rope with fixed CDMA WLL to do the method for FM antenna, as shown in Figure 2, comprises step:
Step S910, in the transmitter 310 and the receiver 320 of fixed CDMA WLL handle is connected handle rope with baseband chip 200 four leads 301,302,303 and 304, select wherein a lead as the FM antenna, and between this selection is as the lead of FM antenna and baseband chip 200, a FM aerial signal access point 101 is set, as shown in Figure 1, be chosen on the lead 302 in two leads 301 and 302 that connect receiver 320 described FM aerial signal access point 101 is set.And between described FM signal access point 101 and baseband chip 200, be connected in series the first magnetic bead L3;
Step S920, on described FM signal access point 101 overlap joint one FM frequency selection circuit 110, and described FM frequency selection circuit 110 is connected with FM frequency modulation chip 100.
The fixed CDMA WLL of band FM function provided by the utility model, make the FM antenna owing to adopt the handle rope of fixed CDMA WLL, and increase corresponding frequency selection circuit, and not only can save cost, keep the fixed CDMA WLL outward appearance, can also make antenna reach a good receptivity.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.

Claims (6)

1. fixed CDMA WLL with the FM function, comprise FM frequency modulation chip, baseband chip, and handle, described handle is connected with described baseband chip by four leads in the handle rope, it is characterized in that, wherein lead in four leads that described baseband chip is connected with described handle is provided with a FM aerial signal access point, and between described FM aerial signal access point and described baseband chip output, be serially connected with first magnetic bead, and on FM aerial signal access point, being overlapped with a FM frequency selection circuit, described FM frequency selection circuit is connected with described FM frequency modulation chip.
2. according to the described fixed CDMA WLL of being with the FM function of claim 1, it is characterized in that, four leads of described handle rope comprise two leads that connect transmitter and two leads that are connected receiver, and described FM aerial signal access point is arranged on the lead in two leads of connection receiver.
3. according to the fixed CDMA WLL of the described band of claim 1 FM function, it is characterized in that, be serially connected with second magnetic bead, the 3rd magnetic bead and the 4th magnetic bead respectively on other three leads in four leads that described baseband chip is connected with described handle.
4. according to the fixed CDMA WLL of the described band of claim 1 FM function, it is characterized in that described first magnetic bead is 2500 ohm a magnetic bead.
5. according to the described fixed CDMA WLL of being with the FM function of claim 1, it is characterized in that, the FM frequency selection circuit comprises first electric capacity, second electric capacity, the 3rd electric capacity and an inductance, first end of described first electric capacity is connected with described FM aerial signal access point, and second end of described first electric capacity is connected with described FM frequency modulation chip by described inductance;
And first end of described first electric capacity also connects with reference to ground by described second electric capacity, and second end of described first electric capacity connects with reference to ground by described the 3rd electric capacity.
6. according to the fixed CDMA WLL of the described band of claim 1 FM function, it is characterized in that it is the chip of RDA5802E that described FM frequency modulation chip adopts a model.
CN2010202950379U 2010-08-17 2010-08-17 Fixed wireless telephone with FM (frequency modulation) function Expired - Lifetime CN201781540U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010202950379U CN201781540U (en) 2010-08-17 2010-08-17 Fixed wireless telephone with FM (frequency modulation) function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010202950379U CN201781540U (en) 2010-08-17 2010-08-17 Fixed wireless telephone with FM (frequency modulation) function

Publications (1)

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CN201781540U true CN201781540U (en) 2011-03-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101924834A (en) * 2010-08-17 2010-12-22 惠州Tcl移动通信有限公司 Method for using handle rope of fixed wireless phone as FM antenna and fixed wireless phone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101924834A (en) * 2010-08-17 2010-12-22 惠州Tcl移动通信有限公司 Method for using handle rope of fixed wireless phone as FM antenna and fixed wireless phone
WO2012022176A1 (en) * 2010-08-17 2012-02-23 惠州Tcl移动通信有限公司 Method for using handle rope of fixed wireless telephone as frequency modulation (fm) antenna and fixed wireless telephone
CN101924834B (en) * 2010-08-17 2013-07-03 惠州Tcl移动通信有限公司 Method for using handle rope of fixed wireless phone as FM antenna and fixed wireless phone
US8588848B2 (en) 2010-08-17 2013-11-19 Huizhou Tcl Mobile Communication Co., Ltd. Method of using handle cord of a fixed wireless phone as FM antenna and a fixed wireless phone

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GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20110330

Effective date of abandoning: 20130703

RGAV Abandon patent right to avoid regrant