CN201243278Y - Low noise signal amplifier for mobile phone radio built-in antenna - Google Patents
Low noise signal amplifier for mobile phone radio built-in antenna Download PDFInfo
- Publication number
- CN201243278Y CN201243278Y CNU2008201466615U CN200820146661U CN201243278Y CN 201243278 Y CN201243278 Y CN 201243278Y CN U2008201466615 U CNU2008201466615 U CN U2008201466615U CN 200820146661 U CN200820146661 U CN 200820146661U CN 201243278 Y CN201243278 Y CN 201243278Y
- Authority
- CN
- China
- Prior art keywords
- mobile phone
- capacitor
- links
- antenna
- triode
- 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.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Images
Landscapes
- Telephone Function (AREA)
Abstract
The utility model relates to a low-noise signal amplifier for a mobile phone radio receiver built-in antenna, which mainly comprises a frequency selective network connected with the mobile phone built-in antenna and an amplifying circuit connected with the frequency selective network; the frequency selective network is composed of a inductor L1 and capacitors C2, C5; the amplifying circuit includes a dynatron Q1 taken as an amplifying device; and the output end of the amplifying circuit is connected with a mobile phone radio receiver chip. The amplifier can solve the problem that earphone is necessary to be used as the antenna when using the mobile phone radio receiver ; and the amplifier has the advantages that the number and quality of the channel scanning are the same as that of the external mobile phone earphone antenna; and the circuit structure is simple.
Description
Technical field
The utility model relates to a kind of signal amplifier, more particularly, relates to a kind of mobile phone reception machine built-in aerial noiselike signal amplifier.
Background technology
Nowadays, cell-phone function from strength to strength, a lot of mobile phones have all assembled radio function, still, a lot of mobile phones are that earphone cord by mobile phone is as radio antenna.Even if when using the loud speaker of mobile phone to listen to, also to connect earphone antenna, must wear earphone when making the broadcast receiver that at every turn uses mobile phone like this, than independent mobile phone, earphone cord can bring a lot of inconvenience to people, therefore, people need a kind of mobile phone that mobile phone reception machine antenna can be placed in the mobile phone.Because the scope of broadcast receiver operating frequency is near 100MHz, therefore, the theoretical length of antenna is 1/4 wavelength, about 75cm.Antenna just can't be integrated into mobile phone inside like this.The less antenna of the use that has is built in mobile phone, but like this signal that receives of antenna will be very weak, and it is few to search platform quantity, and the quality of searching platform is also bad.
The utility model content
The technical problems to be solved in the utility model be to provide a kind of mobile phone reception machine antenna can be placed in the mobile phone and ensure search platform quality and quantity and the essentially identical device simple in structure of mobile telephone external earphone antenna effect.
The technical scheme that its technical problem that solves the utility model adopts provides a kind of mobile phone reception machine built-in aerial noiselike signal amplifier, it comprises frequency-selective network that links to each other with built-in antenna of mobile phone J1 and the amplifying circuit that links to each other with described frequency-selective network, described frequency-selective network is made up of inductance L 1 and capacitor C 2, C5, ground connection after capacitor C 2 is connected with antenna J1, inductance L 1 and capacitor C 5 series connection backs are in parallel with capacitor C 2; Described amplifying circuit comprises the triode Q1 as amplifying device, the base stage of triode Q1 links to each other with power supply through resistance R 2, the collector electrode of triode Q1 links to each other with power supply by resistance R 1, the emitter of triode Q1 links to each other with signal sample circuit and ground connection, and the base stage of triode Q1 is through resistance R 3 ground connection, and the output of described amplifying circuit links to each other with the broadcast receiver of mobile phone.
In above-mentioned mobile phone reception machine built-in aerial noiselike signal amplifier of the present utility model, described amplifying circuit links to each other with described frequency-selective network by capacitor C 4, in the frequency-selective network in the tie point of inductance L 1 and capacitor C 5 and the amplifying circuit base stage of triode Q1 link to each other by capacitor C 4.
In above-mentioned mobile phone reception machine built-in aerial noiselike signal amplifier of the present utility model, described signal sample circuit is composed in parallel by resistance R 4 and capacitor C 1.
In above-mentioned mobile phone reception machine built-in aerial noiselike signal amplifier of the present utility model, the collector electrode of triode Q1 links to each other with the broadcast receiver of mobile phone by capacitor C 3 in the described amplifying circuit.
Implement the mobile phone reception machine built-in aerial noiselike signal amplifier that the utility model provides, wherein frequency-selective network and amplifying circuit make it possible to achieve mobile phone reception machine antenna are built in mobile phone, and have improved greatly and searched platform quantity, ensured audibility and sensitivity.
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 schematic block circuit diagram of the utility model mobile phone reception machine built-in aerial noiselike signal amplifier one embodiment;
Fig. 2 is the circuit theory diagrams of the utility model mobile phone reception machine built-in aerial noiselike signal amplifier one embodiment.
Embodiment
The schematic diagram of mobile phone reception machine built-in aerial noiselike signal amplifier of the present utility model as shown in Figure 1, it comprises the frequency-selective network that links to each other with built-in aerial, the low noise amplifier circuit that links to each other with frequency-selective network, and the signal after will amplifying again outputs to the broadcast receiver of mobile phone.
Referring to Fig. 2, Fig. 2 is the circuit theory diagrams of the utility model mobile phone reception machine built-in aerial noiselike signal amplifier one embodiment.
Antenna is transferred to frequency-selective network with the signal that receives, and frequency-selective network is made up of inductance L 1 and capacitor C 2, C5.Ground connection after capacitor C 2 is connected with antenna J1, inductance L 1 and capacitor C 5 series connection backs are in parallel with capacitor C 2.Frequency-selective network is selected to realize the effect of coupling the frequency range of transmitting the signal that comes.
Claims (4)
1, a kind of mobile phone reception machine built-in aerial noiselike signal amplifier, it is characterized in that, comprise frequency-selective network that links to each other with built-in radio set antenna J1 and the amplifying circuit that links to each other with described frequency-selective network, described frequency-selective network is made up of inductance L 1 and capacitor C 2, C5, ground connection after capacitor C 2 is connected with antenna J1, inductance L 1 and capacitor C 5 series connection backs are in parallel with capacitor C 2; Described amplifying circuit comprises the triode Q1 as amplifying device, the base stage of triode Q1 links to each other with power supply through resistance R 2, the collector electrode of triode Q1 links to each other with power supply by resistance R 1, the emitter of triode Q1 links to each other with signal sample circuit and ground connection, and the base stage of triode Q1 is through resistance R 3 ground connection, and the output of described amplifying circuit links to each other with the broadcast receiver of mobile phone.
2, mobile phone reception machine built-in aerial noiselike signal amplifier according to claim 1, it is characterized in that, described amplifying circuit links to each other with described frequency-selective network by capacitor C 4, in the frequency-selective network in the tie point of inductance L 1 and capacitor C 5 and the amplifying circuit base stage of triode Q1 link to each other by capacitor C 4.
3, mobile phone reception machine built-in aerial noiselike signal amplifier according to claim 1 is characterized in that described signal sample circuit is composed in parallel by resistance R 4 and capacitor C 1.
4, mobile phone reception machine built-in aerial noiselike signal amplifier according to claim 1 is characterized in that, the collector electrode of triode Q1 links to each other with the broadcast receiver of mobile phone by capacitor C 3 in the described amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201466615U CN201243278Y (en) | 2008-08-19 | 2008-08-19 | Low noise signal amplifier for mobile phone radio built-in antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201466615U CN201243278Y (en) | 2008-08-19 | 2008-08-19 | Low noise signal amplifier for mobile phone radio built-in antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201243278Y true CN201243278Y (en) | 2009-05-20 |
Family
ID=40716571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201466615U Expired - Lifetime CN201243278Y (en) | 2008-08-19 | 2008-08-19 | Low noise signal amplifier for mobile phone radio built-in antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201243278Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944921A (en) * | 2009-07-06 | 2011-01-12 | Lg电子株式会社 | Portable terminal |
| WO2011091596A1 (en) * | 2010-01-29 | 2011-08-04 | Laird Technologies Ab | Antenna device and portable electronic device comprising such an antenna device |
| CN111404785A (en) * | 2020-05-13 | 2020-07-10 | 袁野 | 5G mobile network detection system based on cloud computing |
-
2008
- 2008-08-19 CN CNU2008201466615U patent/CN201243278Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944921A (en) * | 2009-07-06 | 2011-01-12 | Lg电子株式会社 | Portable terminal |
| US8406828B2 (en) | 2009-07-06 | 2013-03-26 | Lg Electronics Inc. | Mobile terminal |
| CN101944921B (en) * | 2009-07-06 | 2013-07-03 | Lg电子株式会社 | Mobile terminal |
| WO2011091596A1 (en) * | 2010-01-29 | 2011-08-04 | Laird Technologies Ab | Antenna device and portable electronic device comprising such an antenna device |
| CN111404785A (en) * | 2020-05-13 | 2020-07-10 | 袁野 | 5G mobile network detection system based on cloud computing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102013876B (en) | Combined power control system of radio-frequency power amplifier and method of combined power control system | |
| CN101901961A (en) | A signal receiving device, antenna device and mobile terminal | |
| CN201243278Y (en) | Low noise signal amplifier for mobile phone radio built-in antenna | |
| CN102545785A (en) | Noise suppression circuit and method for frequency modulator | |
| CN102510274A (en) | PWM frequency control method for class-D power amplifiers and device adopting same | |
| CN201234260Y (en) | FM receiving circuit and mobile communication terminal | |
| CN201188660Y (en) | Television embedded with wireless sound transmitting device | |
| CN109525261A (en) | FM receives circuit | |
| CN102625488A (en) | Mobile terminal | |
| CN211481269U (en) | Frequency signal processing circuit | |
| CN205070092U (en) | Electronic equipment antenna plug and electronic equipment | |
| CN201252633Y (en) | a kind of earphone | |
| CN205081535U (en) | A kind of WIFI enhanced mobile phone charger | |
| CN201674486U (en) | A Portable Radio Circuit Structure | |
| CN102006345B (en) | Mobile phone device | |
| CN201947344U (en) | Mobile phone with frequency modulation (FM) reception function | |
| CN201199684Y (en) | Radio circuit for electric vehicle | |
| CN202143205U (en) | Amplitude-modulated wave wireless microphone | |
| CN201266960Y (en) | Mobile terminal | |
| CN201111330Y (en) | Multifunctional apparatus suitable for hearing barrier person | |
| CN203504550U (en) | Receiver circuit for remote router | |
| CN201328122Y (en) | FM radio receiving circuit for portable product | |
| CN202043264U (en) | Frequency modulation wireless microphone circuit with voltage stabilizing circuit | |
| CN202634684U (en) | Frequency modulator having noise suppression circuit | |
| CN201336356Y (en) | Radio external antenna with magnifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090520 |
|
| CX01 | Expiry of patent term |