CN201328122Y - FM radio receiving circuit for portable product - Google Patents
FM radio receiving circuit for portable product Download PDFInfo
- Publication number
- CN201328122Y CN201328122Y CNU2008202358482U CN200820235848U CN201328122Y CN 201328122 Y CN201328122 Y CN 201328122Y CN U2008202358482 U CNU2008202358482 U CN U2008202358482U CN 200820235848 U CN200820235848 U CN 200820235848U CN 201328122 Y CN201328122 Y CN 201328122Y
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- portable product
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Abstract
The utility model relates to a FM radio receiving circuit for portable product; the portable product comprises a shell; an antenna in sequential connection, a low-noise amplifier circuit and radio circuit are arranged inside the shell; wherein the Q value of the antenna is from 1 to 10. The FM radio receiving circuit of the utility model chooses the high-grain and low Q value broadband built-in antenna; and then the broadcast signals received by the antenna will be amplified by a low-noise amplifier before being sent to the radio circuit; the weak signals received by the antenna will be amplified and then sent to the radio circuit, thereby the first-level amplification outside the radio circuit and the second-level amplification inside the radio circuit can be achieved, and the receiving sensitivity of the entire FM can be enhanced. Furthermore, since the antenna adopted is a low Q value antenna with wide entire bandwidth and the bandwidth broadening technology, the antenna can meet the wide bandwidth characteristics of FM broadcast radio, and the problems that the receptivity is easy to be affected by human body can be solved.
Description
Technical field
The utility model relates to broadcast receiving circuit, more particularly, relates to a kind of FM broadcast receiving circuit that is used for portable product.
Background technology
Current along with the development of technology and terminal guest's demand, what FM radio reception broadcast receiver system was more and more general is used in above all kinds of portable products, as mobile phone, and digital camera, DPF or the like.From present market, this series products all also rests on and uses earplug or the telescopic antenna stage as FM radio reception broadcast system antenna mostly.The advantage of this practice is that the receptivity of complete machine is relatively good.But there is earplug to carry inconvenience also, uses shortcomings such as trouble.How on these products, to cast aside earplug and receive the FM broadcast capability, allow the user use to such an extent that convenient and simplely become a problem.There is portioned product to make the design of built-in aerial, the structure of its design is generally: the pattern of built-in aerial+match circuit+tuner, the radio reception effect is generally not ideal enough, be presented as that sensitivity is low, high directivity, be subjected to the human influence big, the performance of using external antenna such as earplug to reach well below like product.Also there are some companies to set about from the angle of broadcast receiver IC, develop corresponding reception IC at built-in aerial, raising receptivity that can be to a certain degree, but still than using earplug to do the more of antenna difference, high directivity and the problem that disturbed by human body still exist in addition, do not satisfy client's requirement.Built-in aerial scheme performance issue has hindered it greatly and has used popularization at portable product.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned portable product of prior art inconvenience with the earplug antenna, and the not high defective of built-in aerial scheme performance now, a kind of FM broadcast receiving circuit structure that is used for portable product is provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of FM broadcast receiving circuit that is used for portable product, described portable product comprises housing, is provided with the antenna, low noise amplifying circuit and the receiver circuit that are electrically connected in turn in described housing; Wherein, the Q value of described antenna is between 1～10, and comprises dynamic matching circuit in the low noise amplifying circuit.
At the FM broadcast receiving circuit that is used for portable product described in the utility model, the Q value of described antenna is as 2,3,4,5,6,7,8 or 9 less than certain numerical value of 10.
At the FM broadcast receiving circuit that is used for portable product described in the utility model, described low noise amplifying circuit comprises first dynamic matching circuit, second match circuit and low noise amplifier; Wherein, described antenna, first dynamic matching circuit, low noise amplifier, second match circuit and receiver circuit are electrically connected in turn.
At the FM broadcast receiving circuit that is used for portable product described in the utility model, described first dynamic matching circuit comprises capacitor C 1, C2, inductance L 1, resistance R 1, R2, diode D1, wherein, one end of resistance R 1, one end of inductance L 1, and the negative electrode of diode D1 is connected with antenna respectively, the other end ground connection of resistance R 1, and the other end of inductance L 1 is connected with an end of capacitor C 1, the other end of capacitor C 1 is connected with the anode of diode D1, and is connected with an end of resistance R 2 and an end of capacitor C 2 respectively; Another termination digital level of resistance R 2, its state are height or low level as required.The other end of capacitor C 2 is connected with the pin of low noise amplifier 2;
At the FM broadcast receiving circuit that is used for portable product described in the utility model, described second match circuit comprises inductance L 2, L3, capacitor C 5, wherein, one end of inductance L 2 is connected with an end of capacitor C 5, an end of inductance L 3 respectively, and the other end of inductance L 2 is connected with the pin of low noise amplifier 5; The other end of capacitor C 5 is coupled to receiver circuit; The other end of inductance L 3 is connected with peripheral circuit.
At the FM broadcast receiving circuit that is used for portable product described in the utility model, described receiver circuit comprises high-frequency amplifier, frequency mixer, intermediate frequency amplifier, demodulator and the power amplifier that is electrically connected in turn.
At the FM broadcast receiving circuit that is used for portable product described in the utility model, described antenna be arranged on described housing inboard around.
Implement the FM broadcast receiving circuit that is used for portable product of the present utility model, has a following beneficial effect: by having selected the broadband internal antenna of high-gain, low reactance-resistance ratio, moreover before the broadcast singal that antenna is received sends to receiver circuit, amplify through low noise amplifier earlier, the small-signal that antenna is received is amplified, and then send to receiver circuit, realize the second level amplification that the outer first order of receiver circuit is amplified and receiver circuit is interior, thereby improve whole FM receiving sensitivity; And because antenna adopts is the antenna of low reactance-resistance ratio, and overall bandwidth is very wide, adds that the rear end bandwidth widens circuit to satisfy the characteristics of FM broadcast radio broader bandwidth, solves the problem that receptivity is subject to the human influence simultaneously.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram that the utility model is used for the FM broadcast receiving circuit of portable product;
Fig. 2 is the circuit theory diagrams of an embodiment of low noise amplifying circuit shown in Figure 1.
Embodiment
Traditional portable product, FM radio reception broadcasting generally with earplug or one section external than long conductor as antenna.Use very inconvenient.Part is built into glue shell inside to antenna, but reception can the extreme variation.Therefore the technical solution of the utility model is that receptivity at FM broadcast radio receiving circuit is optimized, and makes portable product under the prerequisite that does not reduce broadcasting reception performance, uses built-in aerial.As shown in Figure 1, inventive point of the present utility model is to be provided with antenna, low noise amplifying circuit and the receiver circuit that is electrically connected in turn in the housing of portable product; Wherein, the Q value of described antenna is between 1～10.
The bandwidth of antenna is relevant with its quality factor (being the Q value).In general, the Q value is high more, the bandwidth of antenna is narrow more, be the big antenna of Q value when received signal, its response curve is comparatively sharp-pointed, and the little antenna (for example Q＜10) of Q value is when received signal, its response curve is comparatively smooth, the bandwidth that contains is wide more, thereby characteristic that can FM broadcast band broad is complementary, and is subjected to the human influence less simultaneously.In the utility model, quality factor q is taken as＜10 o'clock, make that when built-in aerial carries out wireless listening to bandpass characteristics is preferably arranged, also bigger with Time Bandwidth.Our the Q value quality factor measurement method of indication antenna is as follows: antenna as the form of an inductance, is put into the LCR instrument and tested Q value under its series model.The signal that the low noise amplifying circuit is used for being received from antenna amplifies, so that the processing of circuit of back level.Because generally all very faint from the signal of antenna, the low noise amplifying circuit all is positioned at the position of very close antenna generally speaking, to reduce the loss of signal by transmission line.Be positioned at the one-level at first that whole receiver is close to antenna just because of low noise amplifier, it directly influences the quality of whole receiver acknowledge(ment) signal.The signal that receives in order to ensure antenna can be at the afterbody of receiver by correct recovery, and therefore, the first order of the present utility model produces alap noise and distortion when being amplified in amplifying signal.
Particularly, can use diameter to be wound in magnetic core 100 circles that iron oxide, nickel oxide, cupric oxide and zinc oxide material mix manufacturing in proportion as the enamelled wire of 0.2mm, as FM reception antenna of the present utility model, it realizes the receiving efficiency height, low reactance-resistance ratio, the purpose of wide bandwidth.In design, the Q value of antenna is as 2,3,4,5,6,7,8 or 9 less than certain numerical value of 10.In a preferred embodiment, the Q value is approximately 4.
FM broadcast receiving circuit of the present utility model as with the bonded block of portable product, the FM receiver part is directly accepted the main wave band of frequency modulated transmitter, amplify by the outer second level that the first order is amplified and receiver circuit is interior of receiver circuit then, and power amplifier etc., output on the loud speaker, getting in touch between FM receiver part and portable product is to utilize the master controller of portable product to handle.
Among the embodiment as shown in Figure 1, this low noise amplifying circuit comprises first dynamic matching circuit, second match circuit and low noise amplifier; Wherein, antenna, first dynamic matching circuit, low noise amplifier, second match circuit and receiver circuit are electrically connected in turn.Receiver circuit comprises high-frequency amplifier, frequency mixer, intermediate frequency amplifier, demodulator and the power amplifier that is electrically connected in turn.In the low noise amplifying circuit as shown in Figure 2, first dynamic matching circuit comprises capacitor C 1, C2, inductance L 1, resistance R 1, R2, diode D1, wherein, an end of resistance R 1, one end of inductance L 1, the negative electrode of diode D1 is connected with antenna respectively, the other end ground connection of resistance R 1, and the other end of inductance L 1 connects an end of capacitor C 1, the other end of capacitor C 1 is connected with the D1 negative electrode of diode, and is connected with an end of resistance R 2 and capacitor C 2.The other end of resistance R 2 connects GP02, is digital level, and its state is height or low level as required.The other end of capacitor C 2 is connected with the pin of low noise amplifier 2; Second match circuit comprises inductance L 2, L3, capacitor C 5, and wherein, an end of inductance L 2 is connected with an end of capacitor C 5, inductance L 3.The other end is connected with the pin 5 of low noise amplifier; The other end of capacitor C 5 is coupled to receiver circuit; The other end of inductance L 3 is connected with other peripheral cells of amplifiers such as resistance R 4, R3, capacitor C 3, C4.In addition, in order to obtain reception preferably, the antenna operated by rotary motion is around described housing inboard.
The utility model describes by several specific embodiments, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, at particular condition or concrete condition, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (7)
1, a kind of FM broadcast receiving circuit that is used for portable product, described portable product comprises housing, it is characterized in that, is provided with the antenna, low noise amplifying circuit and the receiver circuit that are electrically connected in turn in described housing; Wherein, the Q value of described antenna is between 1～10.
2, the FM broadcast receiving circuit that is used for portable product according to claim 1 is characterized in that, the Q value of described antenna is 2,3,4,5,6,7,8 or 9.
3, the FM broadcast receiving circuit that is used for portable product according to claim 1 and 2 is characterized in that, described low noise amplifying circuit comprises first dynamic matching circuit, second match circuit and low noise amplifier; Wherein, described antenna, first dynamic matching circuit, low noise amplifier, second match circuit and receiver circuit are electrically connected in turn.
4, the FM broadcast receiving circuit that is used for portable product according to claim 3 is characterized in that, described first dynamic matching circuit comprises capacitor C 1, C2, inductance L 1, and resistance R 1, R2, diode D1, wherein,
One end of resistance R 1, one end of inductance L 1, and the negative electrode of diode D1 is connected with antenna respectively, the other end ground connection of resistance R 1, the other end of inductance L 1 is connected with an end of capacitor C 1, the other end of capacitor C 1 is connected with the anode of diode D1, and is connected with an end of resistance R 2 and an end of capacitor C 2 respectively;
Another termination digital level of resistance R 2;
The other end of capacitor C 2 is connected with the pin of low noise amplifier 2.
5, the FM broadcast receiving circuit that is used for portable product according to claim 3 is characterized in that, described second match circuit comprises inductance L 2, L3, capacitor C 5, wherein,
One end of inductance L 2 is connected with an end of capacitor C 5, an end of inductance L 3 respectively, and the other end of inductance L 2 is connected with the pin of low noise amplifier 5;
The other end of capacitor C 5 is coupled to receiver circuit;
The other end of inductance L 3 is connected with peripheral circuit.
6, the FM broadcast receiving circuit that is used for portable product according to claim 3 is characterized in that, described receiver circuit comprises high-frequency amplifier, frequency mixer, intermediate frequency amplifier, demodulator and the power amplifier that is electrically connected in turn.
7, the FM broadcast receiving circuit that is used for portable product according to claim 3 is characterized in that, described antenna be arranged on described housing inboard around.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202358482U CN201328122Y (en) | 2008-12-26 | 2008-12-26 | FM radio receiving circuit for portable product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202358482U CN201328122Y (en) | 2008-12-26 | 2008-12-26 | FM radio receiving circuit for portable product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201328122Y true CN201328122Y (en) | 2009-10-14 |
Family
ID=41180082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202358482U Expired - Lifetime CN201328122Y (en) | 2008-12-26 | 2008-12-26 | FM radio receiving circuit for portable product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201328122Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035373A (en) * | 2019-04-25 | 2019-07-19 | 湖南智领通信科技有限公司 | A kind of wireless overlength distance audio broadcasting equipment of energy secondary modulation amplification |
-
2008
- 2008-12-26 CN CNU2008202358482U patent/CN201328122Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035373A (en) * | 2019-04-25 | 2019-07-19 | 湖南智领通信科技有限公司 | A kind of wireless overlength distance audio broadcasting equipment of energy secondary modulation amplification |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN SECOM ADVANCED TECHNOLOGIES CO., LTD. Free format text: FORMER OWNER: SHENZHEN SHIQIANG TELECOMMUNICATION CO., LTD. Effective date: 20130509 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130509 Address after: 518001 Guangdong city in Shenzhen Province, Luohu District people's South shenfang Plaza A block 3201, 3204 Patentee after: Shenzhen Secom Advanced Technologies Co., Ltd. Address before: The people of South Shenzhen City, Guangdong province 518001 A Shenzhen Plaza No. 3005 32 floor Patentee before: Shenzhen Shiqiang Telecommunication Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20091014 |
|
| CX01 | Expiry of patent term |