CN2363431Y - FM receiver with electronic tuning and frequency ordering - Google Patents
FM receiver with electronic tuning and frequency ordering Download PDFInfo
- Publication number
- CN2363431Y CN2363431Y CN 98225223 CN98225223U CN2363431Y CN 2363431 Y CN2363431 Y CN 2363431Y CN 98225223 CN98225223 CN 98225223 CN 98225223 U CN98225223 U CN 98225223U CN 2363431 Y CN2363431 Y CN 2363431Y
- Authority
- CN
- China
- Prior art keywords
- capacitor
- radio
- port
- integrated circuit
- circuit
- 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 - Fee Related
Links
Images
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
The utility model discloses an FM broadcast receiver with electronic tuning and dot frequency, which is characterized in that a high frequency loop and a local oscillation circuit are connected with variable capacitance diodes to accomplish tracking tuning to select receiving dot frequency f0 and f0 plus or minus 1 megacycle frequency coverage, wwhich causes the tuning is widened. The utility model is not influenced by environment temperature and the voltage fluctuation of a power supply. The tuning is stable and reliable, and the utility model which does not detune improves the receiving effect.
Description
The utility model relates to the radio broadcasting receiver, belongs to a frequency fm broadcast receiver especially.
Wired broadcasting has been replaced with outdoor FM radio in many rural areas, and receive frequency range is the 87-108 megacycle, topped wide 21 megacycles that reach of full frequency band frequency.Therefore moving slightly knob, frequency will be lost partially.Especially the outdoor use in the rural area receive only single-frequency, but existing full frequency band broadcast receiver is influenced by physical factors such as variation of ambient temperature and mains fluctuations, causes that tuned frequency seriously drifts about, and influences normally listening to of peasant.
The purpose of this utility model provides a kind of electric tuning point fm broadcast receiver frequently, and it can tuning broadening, makes tuning reliable and stablely, avoids the tuned frequency drift.
The utility model is to realize by following technical scheme, and it is by shell, antenna, and loud speaker, integrated circuit of radio receiver, radio circuit, the local oscillation loop is formed, and this radio circuit includes inductance L
1, capacitor C
1, inductance L
1And capacitor C
1Be connected with the radio circuit port and the high frequency ground end port of integrated circuit of radio receiver, this local oscillation loop includes inductance L
2, capacitor C
3, inductance L
2And capacitor C
3Be connected with the oscillation circuit port and the high frequency ground end port of integrated circuit of radio receiver, its structural feature is that it also is provided with the electric tuning power supply circuits, one end of electric tuning power supply circuits is connected with the high frequency ground of integrated circuit of radio receiver end port, another termination power, and above-mentioned radio circuit also comprises capacitor C
2, variable capacitance diode CD
1, capacitor C
2With variable capacitance diode CD
1Series connection, its two ends are connected with high frequency ground end port with the radio circuit port of integrated circuit of radio receiver again, and above-mentioned local oscillation loop also comprises capacitor C
4, variable capacitance diode CD
2, capacitor C
4With variable capacitance diode CD
2Series connection, its two ends are connected with high frequency ground end port with the oscillation circuit port of integrated circuit of radio receiver again.
Radio circuit and local oscillation loop are two inductance L and capacitor C loop, and the resonance frequency f in L, C loop is relevant with total capacitance C with the total inductance amount L in loop, and the utility model is according to common-used formula
Design.
The utility model realizes that a frequency is tuning owing to adopted the circuit that includes variable capacitance diode, and the frequency tuning range that makes reception is f
0± 1 megacycle, promptly the topped scope of frequency is 2 megacycles.Simple in structure, cost is low.Prove in ambient temperature after tested to be-30 ℃-+70 ℃, the mains fluctuations scope is for exchanging 150V-280V, and its tuning broadening is reliable and stable.Sound is clear, has avoided off resonance, has improved reception.
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is radio circuit of the present utility model, local oscillation, electric tuning power supply circuits schematic diagram.
Below with reference to embodiment shown in the drawings, the utility model is described in further detail.
Among Fig. 1, antenna is connected with integrated circuit of radio receiver.Radio circuit is connected with local oscillation loop and electric tuning power supply circuits, and is connected with integrated circuit of radio receiver respectively.Integrated circuit of radio receiver is connected with loud speaker.This integrated circuit of radio receiver can be the CXA1019M/P type, also can be CXA1019S type, CXA1191M/P type, CXA1191S type integrated circuit, and present embodiment adopts CXA1019P type integrated circuit of radio receiver IC.
Among Fig. 2, radio circuit is by inductance L
1, capacitor C
1, C
2, variable capacitance diode CD
1Form.Capacitor C
2And CD
1Series connection and inductance L
1, capacitor C
1In parallel with CXA1019P type integrated circuit of radio receiver IC port 8,9 together, port 8 is high frequency ground ends, and port 9 is radio circuit ports, changes variable capacitance diode CD
1Junction capacitance can change the resonance frequency of radio circuit.Local oscillation is by inductance L
2, capacitor C
3, C
4, variable capacitance diode CD
2Form.Capacitor C
4With variable capacitance diode CD
2Series connection and inductance L
2, capacitor C
3In parallel with integrated circuit (IC) port 7,8 together, port 7 is oscillation circuit ports, changes variable capacitance diode CD
2Junction capacitance is controlled frequency of oscillation, variable capacitance diode CD
1, CD
2Effect be to make sound clear, avoid producing swish.The electric tuning power supply circuits are by potentiometer W, capacitor C
5, C
6, C
7, C
8, C
9, C
10, resistance R
1, R
2, three terminal regulator V
RForm.The end of potentiometer W is connected variable capacitance diode CD with the port 8 of integrated circuit (IC)
1With capacitor C
2Contact and potentiometer W between the cross-over connection resistance R
1Variable capacitance diode CD
2With capacitor C
4Contact and potentiometer W between the cross-over connection resistance R
2, resistance R
1, R
2Be isolation resistance.Capacitor C
5, C
6An end be connected with integrated circuit (IC) port 8, the other end is connected with ground wire, capacitor C
5, C
6Play the power supply filter action.Capacitor C
7, C
8An end be connected with potentiometer W centre cap, the other end is connected capacitor C with integrated circuit port 8
7, C
8Be decoupling capacitance.One end of three terminal regulator is connected with potentiometer W, another termination power.Capacitor C
9, C
10An end be connected other end earth connection, capacitor C with three terminal regulator
9, C
10Play the power supply filter action.Present embodiment adopts 7805 type three terminal regulators.When regulator potentiometer W knob, by its centre cap, through resistance R
1, R
2Synchronously to variable capacitance diode CD
1, CD
2Reversed bias voltage is provided, controls the variable capacitance diode junction capacitance and change.Make radio circuit and local oscillation loop realize that tracking is tuning, select the some frequency f of reception
0Present embodiment is set the some frequency f that receives
0Be 98 megacycles, when the component parameter inductance L
1, L
2Be respectively 0.104 μ H and 0.085 μ H, 2CC16B type variable capacitance diode CD
1, CD
2Junction capacitance be 18p-40p, capacitor C
1, C
3Be 20p, capacitor C
2, C
4During for 6.8p, then radio circuit and local oscillation loop tracking frequency tuning range is f
0± 1 megacycle, i.e. 97-99 megacycle, point topped scope frequently are 2 megacycles.
Claims (3)
1. electric tuning point fm broadcast receiver frequently, by shell, antenna, loud speaker, integrated circuit of radio receiver, radio circuit, the local oscillation loop is formed, and described radio circuit includes inductance L
1, capacitor C
1, inductance L
1And capacitor C
1Be connected with the radio circuit port and the high frequency ground end port of integrated circuit of radio receiver, described local oscillation loop includes inductance L
2, capacitor C
3, inductance L
2And capacitor C
3Be connected with the oscillation circuit port and the high frequency ground end port of integrated circuit of radio receiver, it is characterized in that: it also is provided with the electric tuning power supply circuits, the one termination integrated circuit of radio receiver high frequency ground end port of electric tuning power supply circuits, another termination power, above-mentioned radio circuit also comprises capacitor C
2, variable capacitance diode CD
1, capacitor C
2With variable capacitance diode CD
1Series connection, its two ends are connected with high frequency ground end port with the radio circuit port of integrated circuit of radio receiver again, and above-mentioned local oscillation loop also comprises capacitor C
4, variable capacitance diode CD
2, capacitor C
4With variable capacitance diode CD
2Series connection, its two ends are connected with high frequency ground end port with the oscillation circuit port of integrated circuit of radio receiver again.
2. broadcasting receiver according to claim 1 is characterized in that the electric tuning power supply circuits are by potentiometer W, capacitor C
5, C
6, C
7, C
8, C
9, C
10, resistance R
1, R
2, three terminal regulator is formed, and the end of potentiometer W is connected with integrated circuit of radio receiver high frequency ground end port, and the other end is connected with three terminal regulator, variable capacitance diode CD in the radio circuit
1With capacitor C
2Contact and potentiometer W between cross-over connection resistance R is arranged
1, the variable capacitance diode CD in the local oscillation loop
2With capacitor C
4Contact and potentiometer W between cross-over connection resistance R is arranged
2, capacitor C
5, C
6An end and integrated circuit of radio receiver high frequency ground end port be connected other end earth connection, capacitor C
7, C
8An end be connected with potentiometer W centre cap, the other end and integrated circuit of radio receiver high frequency ground end port is connected, an end of three terminal regulator is connected capacitor C with power supply
9, C
10An end be connected other end earth connection with three terminal regulator.
3. broadcasting receiver according to claim 1 is characterized in that it is f that frequency tuning range is followed the tracks of in radio circuit and local oscillation loop
0± 1 megacycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98225223 CN2363431Y (en) | 1998-09-29 | 1998-09-29 | FM receiver with electronic tuning and frequency ordering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98225223 CN2363431Y (en) | 1998-09-29 | 1998-09-29 | FM receiver with electronic tuning and frequency ordering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2363431Y true CN2363431Y (en) | 2000-02-09 |
Family
ID=33975951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98225223 Expired - Fee Related CN2363431Y (en) | 1998-09-29 | 1998-09-29 | FM receiver with electronic tuning and frequency ordering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2363431Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100431258C (en) * | 2001-05-28 | 2008-11-05 | Nxp股份有限公司 | Power supply ripple rejection in tuner oscillator stage |
| CN102098068B (en) * | 2009-12-11 | 2013-09-11 | 无锡华润矽科微电子有限公司 | Radio and tuned receiving circuit thereof |
-
1998
- 1998-09-29 CN CN 98225223 patent/CN2363431Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100431258C (en) * | 2001-05-28 | 2008-11-05 | Nxp股份有限公司 | Power supply ripple rejection in tuner oscillator stage |
| CN102098068B (en) * | 2009-12-11 | 2013-09-11 | 无锡华润矽科微电子有限公司 | Radio and tuned receiving circuit thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102545952B (en) | Wireless transceiver | |
| EP2478471A1 (en) | Identification module with an active tag | |
| CN103797719A (en) | Automatic tuning circuit | |
| CN2363431Y (en) | FM receiver with electronic tuning and frequency ordering | |
| CN201378620Y (en) | Antenna connecting circuit and mobile communication terminal with same | |
| CN207853847U (en) | A kind of low phase noise broad tuning bandwidth voltage-controlled oscillator circuit | |
| CN203301609U (en) | Tuner for receiving Ku wave band satellite television signals | |
| CN1989699A (en) | Mobile telephone device | |
| CN202261187U (en) | Radio-frequency tuning circuit of mobile terminal | |
| CN109921807A (en) | A kind of broadband chaotic oscillating circuit | |
| CN208706849U (en) | A kind of mobile communication terminal antenna that the full frequency band suitable for small headroom covers | |
| CN2503672Y (en) | KU frequency-channel satellite receiving tuner | |
| US5613231A (en) | Super-reactive oscillator and receiver | |
| CN202143205U (en) | Amplitude-modulated wave wireless microphone | |
| CN2419749Y (en) | Satellite receiver | |
| CN220108073U (en) | Multi-module integrated KU wave band low-noise frequency demultiplier | |
| CN220492195U (en) | Low-frequency intelligent watch antenna | |
| CN216252732U (en) | Isolated communication circuit | |
| CN204517767U (en) | Microwave receiver radio-frequency (RF) front-end circuit electrically tunable filter | |
| CN112104328B (en) | Wide-range low-power fluctuation voltage-controlled oscillator using co-tuned buffer | |
| JP3270343B2 (en) | Antenna device | |
| CN218336006U (en) | Radio reception frequency division control circuit and radio receiver | |
| JPH0682991B2 (en) | Frequency conversion circuit | |
| CN218162451U (en) | Radio frequency receiving circuit | |
| CN201533362U (en) | Multimedia broadcast receiving voice-frequency circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |