CN203911872U - Frequency modulation electric circuit capable of inhibiting frequency deviation - Google Patents
Frequency modulation electric circuit capable of inhibiting frequency deviation Download PDFInfo
- Publication number
- CN203911872U CN203911872U CN201420231019.2U CN201420231019U CN203911872U CN 203911872 U CN203911872 U CN 203911872U CN 201420231019 U CN201420231019 U CN 201420231019U CN 203911872 U CN203911872 U CN 203911872U
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- capacitor
- resistance
- frequency
- resistor
- triode
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Abstract
The utility model provides a frequency modulation electric circuit capable of inhibiting frequency deviation. The frequency modulation electric circuit comprises a capacitor C1, wherein one end of the capacitor C1 is connected with a radio-frequency input, one end of resistor R2 and the base electrode of a triode Q1; the other end of the capacitor C1 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with one end of a capacitor C6, one end of a resistor R4, one end of an inductance L2, one end of a capacitor C5, a power supply positive pole, and one end of a resistor R3; the other end of the capacitor C6 is connected with a power supply negative pole; the other end of the resistor R2 is connected with one end of a resistor R3, one end of an inductance L1, and the collector electrode of the triode Q1; the other end of the inductance L1 is connected with the negative pole of a diode D1 and one end of a crystal oscillator Z1; the other end of the crystal oscillator Z1 is connected with one end of a resistor R6 and the other end of the resistor R4. The frequency modulation electric circuit can effectively inhibit frequency deviation and greatly improve communication quality.
Description
Technical field
The utility model relates to a kind of FM circuit of blanketing frequency skew.
Background technology
Frequency modulation (FM), be exactly the frequency of high frequency carrier is not a constant, is the modulation system changing within the specific limits with modulation signal, and its amplitude is a constant.Existing usually can occurrence frequency in frequency-modulating process skew, communication quality is declined.
Summary of the invention
The technical problems to be solved in the utility model, is to provide a kind of FM circuit of blanketing frequency skew, solves existing frequency-modulating process frequency offset, problem that communication quality is low.
The utility model is achieved in that
A FM circuit for blanketing frequency skew, comprises capacitor C 1, one end of capacitor C 1 and rf inputs, one end of resistance R 2 is connected with the base stage of triode Q1, and the other end of capacitor C 1 is connected with one end of resistance R 1, one end of the other end of resistance R 1 and capacitor C 6, one end of resistance R 4, one end of inductance L 2, one end of capacitor C 5, positive source is connected with one end of resistance R 3, and the other end of capacitor C 6 is connected with power cathode, one end of the other end of resistance R 2 and resistance R 3, one end of inductance L 1 is connected with the collector electrode of triode Q1, the other end of inductance L 1 is connected with the negative pole of diode D1 and one end of crystal oscillator Z1, the other end of crystal oscillator Z1 is connected with one end of resistance R 6 and the other end of resistance R 4, the other end of the other end of inductance L 2 and capacitor C 5, radio-frequency (RF) output end is connected with the collector electrode of triode Q2, and the base stage of triode Q2 is connected with one end of capacitor C 3, one end of the other end of capacitor C 3 and capacitor C 4, the emitter of triode Q2 is connected with one end of resistance R 5, the emitter of triode Q1, the positive pole of diode D1, the other end of resistance R 6, the other end of resistance C4, the other end of resistance R 5 is connected with power cathode.
The utility model has the advantage of: blanketing frequency skew effectively, improves communication quality greatly.
Brief description of the drawings
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is structural representation of the present utility model.
Embodiment
Refer to shown in Fig. 1, a kind of FM circuit of blanketing frequency skew, comprises capacitor C 1, one end of capacitor C 1 and rf inputs, one end of resistance R 2 is connected with the base stage of triode Q1, and the other end of capacitor C 1 is connected with one end of resistance R 1, one end of the other end of resistance R 1 and capacitor C 6, one end of resistance R 4, one end of inductance L 2, one end of capacitor C 5, positive source is connected with one end of resistance R 3, and the other end of capacitor C 6 is connected with power cathode, one end of the other end of resistance R 2 and resistance R 3, one end of inductance L 1 is connected with the collector electrode of triode Q1, the other end of inductance L 1 is connected with the negative pole of diode D1 and one end of crystal oscillator Z1, the other end of crystal oscillator Z1 is connected with one end of resistance R 6 and the other end of resistance R 4, the other end of the other end of inductance L 2 and capacitor C 5, radio-frequency (RF) output end is connected with the collector electrode of triode Q2, and the base stage of triode Q2 is connected with one end of capacitor C 3, one end of the other end of capacitor C 3 and capacitor C 4, the emitter of triode Q2 is connected with one end of resistance R 5, the emitter of triode Q1, the positive pole of diode D1, the other end of resistance R 6, the other end of resistance C4, the other end of resistance R 5 is connected with power cathode.
Below this circuit is elaborated, the whole circuit of the utility model is amplified by radio frequency input and higher-order of oscillation two large divisions forms.Resistance R 2 in radio frequency input amplifying circuit, resistance R 3, triode Q1 form collector electrode negative feedback amplifier, for the weak signal of radio frequency input is amplified.Triode Q2 and capacitor C 3, capacitor C 4 forms crystal oscillator, and the resonance center frequeH of the resonant circuit that inductance L 2 and capacitor C 5 form is set to the integral multiple of crystal oscillator Z1.
Suppose that crystal oscillator Z1 is A frequency, resonance center frequeH just can be designed to A*N (being the integral multiple of A) so.Inductance L 1 is high frequency choke coil, prevents from that high-frequency signal below from returning to scurry into radio frequency input amplification region and cause interference.
The signal of rf inputs signal after amplifying is directly added in the two ends of adjustable withstand voltage diode D1, the centre frequency of oscillating circuit is just along with the amplitude of radio-frequency input signals is followed variation in frequency spectrum center frequency points position, blanketing frequency skew effectively, reaches and improves communication quality object.
The above execution mode, it is preferred embodiments of the present utility model, be not to limit the utility model practical range, the equivalence of doing according to structure, feature and principle described in the utility model claim therefore all changes or modifies, and all should comprise in the utility model patent claim.
Claims (1)
1. a FM circuit for blanketing frequency skew, is characterized in that: comprise capacitor C 1, one end of capacitor C 1 and rf inputs, one end of resistance R 2 is connected with the base stage of triode Q1, and the other end of capacitor C 1 is connected with one end of resistance R 1, one end of the other end of resistance R 1 and capacitor C 6, one end of resistance R 4, one end of inductance L 2, one end of capacitor C 5, positive source is connected with one end of resistance R 3, and the other end of capacitor C 6 is connected with power cathode, one end of the other end of resistance R 2 and resistance R 3, one end of inductance L 1 is connected with the collector electrode of triode Q1, the other end of inductance L 1 is connected with the negative pole of diode D1 and one end of crystal oscillator Z1, the other end of crystal oscillator Z1 is connected with one end of resistance R 6 and the other end of resistance R 4, the other end of the other end of inductance L 2 and capacitor C 5, radio-frequency (RF) output end is connected with the collector electrode of triode Q2, and the base stage of triode Q2 is connected with one end of capacitor C 3, one end of the other end of capacitor C 3 and capacitor C 4, the emitter of triode Q2 is connected with one end of resistance R 5, the emitter of triode Q1, the positive pole of diode D1, the other end of resistance R 6, the other end of resistance C4, the other end of resistance R 5 is connected with power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231019.2U CN203911872U (en) | 2014-05-07 | 2014-05-07 | Frequency modulation electric circuit capable of inhibiting frequency deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231019.2U CN203911872U (en) | 2014-05-07 | 2014-05-07 | Frequency modulation electric circuit capable of inhibiting frequency deviation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911872U true CN203911872U (en) | 2014-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420231019.2U Expired - Fee Related CN203911872U (en) | 2014-05-07 | 2014-05-07 | Frequency modulation electric circuit capable of inhibiting frequency deviation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203911872U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392194A (en) * | 2014-11-25 | 2015-03-04 | 成都龙腾中远信息技术有限公司 | Simple radio frequency card circuit |
| CN105977799A (en) * | 2016-06-23 | 2016-09-28 | 李玉盛 | Intelligent power distribution equipment for power transmission network |
-
2014
- 2014-05-07 CN CN201420231019.2U patent/CN203911872U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392194A (en) * | 2014-11-25 | 2015-03-04 | 成都龙腾中远信息技术有限公司 | Simple radio frequency card circuit |
| CN105977799A (en) * | 2016-06-23 | 2016-09-28 | 李玉盛 | Intelligent power distribution equipment for power transmission network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20150507 |
|
| EXPY | Termination of patent right or utility model |