CN204068933U - The microwave local oscillation signal generator of small integrated - Google Patents
The microwave local oscillation signal generator of small integrated Download PDFInfo
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- CN204068933U CN204068933U CN201420533700.2U CN201420533700U CN204068933U CN 204068933 U CN204068933 U CN 204068933U CN 201420533700 U CN201420533700 U CN 201420533700U CN 204068933 U CN204068933 U CN 204068933U
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Abstract
A microwave local oscillation signal generator for small integrated, belongs to communication technical field.Comprise crystal oscillator, LC band pass filter, first amplifier, be integrated with the phase-locked loop chip of voltage controlled oscillator, loop filter, second amplifier and LTCC filter, described crystal oscillator is connected to the input of LC band pass filter, the input of output termination first amplifier of described LC band pass filter, the described output of the first amplifier is connected with the input of phase-locked loop chip, the output of described phase-locked loop chip connects the input of the second amplifier, the output of the second described amplifier connects the input of LTCC filter, the output of described LTCC filter outwards exports local oscillation signal, described loop filter and phase-locked loop chip are bi-directionally connected.Advantage: inhibit phase noise well, reduces the size of printed circuit board (PCB), and system reliability strengthens, and consistency has had raising.
Description
Technical field
The utility model belongs to communication technical field, is specifically related to a kind of microwave local oscillation signal generator of small integrated.
Background technology
In a communications system, local oscillation signal has the basic function of conversion frequency, can be described as one of indispensable key link in communication system.Local oscillation signal is produced by local oscillation circuit, in local oscillation circuit, be added with phase-locked loop circuit, thus ensure that high stability.The stability of local frequency is extremely important, otherwise can produce local frequency drift, and causing cannot the consequence of rating.Phase-locked loop circuit is a kind of by the feedback control circuit eliminated for the purpose of frequency error, and be called for short phase-locked loop, its controlled variable is phase place, and controlled device is voltage controlled oscillator.The feature of phase-locked loop is frequency and the phase place of the reference signal control loop internal oscillation signal utilizing outside input, with this realize output signal frequency to frequency input signal from motion tracking, therefore phase-locked loop is generally used for Closed loop track circuit.PHASE-LOCKED LOOP PLL TECHNIQUE has a wide range of applications in signal transacting and digital system, as frequency modulation(FM), Frequency Locking, clock synchronous, frequency synthesis etc.Generally, phase-locked loop is made up of three elementary cells: phase discriminator, loop filter and voltage controlled oscillator.Phase discriminator is a phase comparator, and the sampling frequency that reference frequency and voltage controlled oscillator export carries out phase compare therein, output error voltage; Loop filter is that the error voltage that phase discriminator exports is carried out filtering, the interference in filtering electric current and radio-frequency component, to ensure the performance required by loop, improves the stability of system; Voltage controlled oscillator, by the DC voltage control that loop filter exports, described direct voltage pulls to the reference frequency of loop input the output frequency of voltage controlled oscillator, and when both frequencies are equal and phase difference is constant, loop is locked.Local oscillation signal generator common at present, great majority have employed the structure that phase-locked loop chip, loop filter and voltage controlled oscillator combine, the all parts such as phase-locked loop chip, loop filter, voltage controlled oscillator need independently-powered, the volume of shared printed circuit board (PCB) (PCB) is comparatively large, its corresponding debug process and debugging step also more complicated.
In view of above-mentioned prior art, be necessary to be improved, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The purpose of this utility model is the microwave local oscillation signal generator providing a kind of small integrated, and its each part height is integrated, printed circuit board (PCB) small volume used, and debugging is simple.
The purpose of this utility model reaches like this, a kind of microwave local oscillation signal generator of small integrated, it is characterized in that: comprise crystal oscillator, LC band pass filter, first amplifier, be integrated with the phase-locked loop chip of voltage controlled oscillator, loop filter, second amplifier and LTCC filter, described crystal oscillator is connected to the input of LC band pass filter, the input of output termination first amplifier of described LC band pass filter, the described output of the first amplifier is connected with the input of phase-locked loop chip, the output of described phase-locked loop chip connects the input of the second amplifier, the output of the second described amplifier connects the input of LTCC filter, the output of described LTCC filter outwards exports local oscillation signal, described loop filter and phase-locked loop chip are bi-directionally connected.
In a specific embodiment of the present utility model, the frequency of oscillation of described crystal oscillator is 10MHz.
In another specific embodiment of the present utility model, the band of described LC band pass filter leads to the third harmonic frequencies 30MHz that working frequency points is the frequency of oscillation of crystal oscillator.
In another specific embodiment of the present utility model, described LC band pass filter comprises the first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, first inductance L 1 and the second inductance L 2, one end of the first described electric capacity C1 is connected with described crystal oscillator as the input of LC band pass filter, the other end of the first electric capacity C1 and one end of the first inductance L 1, one end of 4th electric capacity C4 and one end of the second electric capacity C2 connect, the other end of the second electric capacity C2 and one end of the second inductance L 2, one end of 5th electric capacity C5 and one end of the 3rd electric capacity C3 connect, the other end of the 3rd electric capacity C3 is connected with the first described amplifier as the output of LC band pass filter, the other end of the first inductance L 1, the other end of the 4th electric capacity C4, the other end of the second inductance L 2 and the other end common ground of the 5th electric capacity C5.
In another specific embodiment of the present utility model, the first described amplifier comprises crystal amplifier U1, first resistance R1, second resistance R2, 3rd resistance R3, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8 and the 3rd inductance L 3, one end of first resistance R1 is connected with one end of one end of the 3rd inductance L 3 and the 8th electric capacity C8, the input becoming the first amplifier is connected with LC band pass filter, the other end of the first resistance R1 is connected with one end of the second resistance R2 and 2 pin of crystal amplifier U1, 1 pin of crystal amplifier U1 is connected with one end of one end of the 3rd resistance R3 and the 6th electric capacity C6, 3 pin of crystal amplifier U1 and the other end of the 3rd inductance L 3, the other end of the 8th electric capacity C8 and one end of the 7th electric capacity C7 connect, the output that the other end of the 7th electric capacity C7 becomes amplifier is connected with phase-locked loop chip, the other end of the second resistance R2, the other end of the 3rd resistance R3 and the other end common ground of the 6th electric capacity C6.
Also have in a specific embodiment of the present utility model, the first described amplifier and the second amplifier are identical amplifier.
More of the present utility model and in a specific embodiment, described loop filter comprises the 4th resistance R4 and the 9th electric capacity C9, tenth electric capacity C10 and the 11 electric capacity C11, one end of the 4th described resistance R4 is connected with one end of the 11 electric capacity C11, the other end of the 4th resistance R4 is connected with one end of one end of the 9th electric capacity C9 and the tenth electric capacity C10, the other end of the 9th electric capacity C9, the other end of the tenth electric capacity C10 and the other end common ground of the 11 electric capacity C11, one end of 4th resistance R4 is connected with phase-locked loop chip as the input of filter, one end of 11 electric capacity C11 is connected with phase-locked loop chip as the output of filter.
The utility model is owing to have employed said structure, Integrated VCO in phase-locked loop chip, phase noise can be suppressed well, and while minimizing peripheral cell, also reduce the size of printed circuit board (PCB), and further increase circuit reliability, the performance requirement of system can be met better; In addition, the signal that described phase-locked loop chip produces, after the second amplifier amplifies, utilize LTCC filter to carry out filtering, this technology utilizes harmonic wave as reference frequency signal, also can reduce phase noise, the integral frequency divisioil of low noise then can obtain excellent phase noise further; Be integrated with the phase-locked loop chip of voltage controlled oscillator and LTCC filter with the use of, improve the integrated level of system and reduce the overall volume of system, also simplify the debugging of system, system reliability is strengthened, and consistency is better.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is an embodiment electrical schematic diagram of LC band pass filter described in the utility model.
Fig. 3 is an embodiment electrical schematic diagram of the first amplifier described in the utility model.
Fig. 4 is an embodiment electrical schematic diagram of loop filter described in the utility model.
Embodiment
Applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, any changing in the form rather than substance according to the utility model design all should be considered as protection range of the present utility model.
Refer to Fig. 1, a microwave local oscillation signal generator for small integrated, comprises crystal oscillator, phase-locked loop chip, loop filter, the second amplifier and LTCC filter that LC band pass filter, the first amplifier, inside are integrated with voltage controlled oscillator.In the present embodiment, the frequency of oscillation of described crystal oscillator is 10MHz, and described phase-locked loop chip adopts LTC6946.Described crystal oscillator is connected to the input of LC band pass filter, the input of output termination first amplifier of described LC band pass filter, the described output of the first amplifier is connected with the input of phase-locked loop chip, the output of described phase-locked loop chip connects the input of the second amplifier, the output of the second described amplifier connects the input of LTCC filter, the output of described LTCC filter outwards exports local oscillation signal, and described loop filter and phase-locked loop chip are bi-directionally connected.
Refer to Fig. 2, described LC band pass filter comprises the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the first inductance L 1 and the second inductance L 2.One end of the first described electric capacity C1 is connected with described crystal oscillator as the input of LC band pass filter, the other end of the first electric capacity C1 and one end of the first inductance L 1, one end of 4th electric capacity C4 and one end of the second electric capacity C2 connect, the other end of the second electric capacity C2 and one end of the second inductance L 2, one end of 5th electric capacity C5 and one end of the 3rd electric capacity C3 connect, the other end of the 3rd electric capacity C3 is connected with the first described amplifier as the output of LC band pass filter, the other end of the first inductance L 1, the other end of the 4th electric capacity C4, the other end of the second inductance L 2 and the other end common ground of the 5th electric capacity C5.The band of described LC band pass filter leads to the third harmonic frequencies 30MHz that working frequency points is the frequency of oscillation of crystal oscillator, and it has certain inhibitory action to the 10MHz of the intrinsic generation of crystal oscillator and other harmonic waves.
Refer to Fig. 3, the first described amplifier comprises crystal amplifier U1, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8 and the 3rd inductance L 3, in the present embodiment, described crystal amplifier U1 adopts NE68819, and its intrinsic operating frequency can arrive 2GHz.The frequency signal of the first described amplifier to the 30MHz that LC band pass filter exports carries out Harmonics amplification.Particularly, after the first resistance R1 and the second resistance R2 dividing potential drop for crystal amplifier U1 provides base bias voltage; 3rd resistance R3 and the 6th electric capacity C6 provides emitter bias voltage for crystal amplifier U1, forms a feedback loop; First resistance R1, the second resistance R2, the 3rd resistance R3 and the 6th electric capacity C6 are that crystal amplifier U1 forms a quiescent point, 3rd inductance L 3 is connected directly between on power supply, for crystal amplifier U1 feed, also form a resonant selecting frequency circuit with the 8th electric capacity C8 simultaneously, make the gain amplifier of crystal amplifier U1 near the frequency of 30MHz the highest, 7th electric capacity C7 is output coupling capacitor, the frequency signal of the 30MHz after crystal amplifier U1 amplifies is coupled to next stage circuit, and next stage circuit is herein phase-locked loop chip.
Refer to Fig. 4, described loop filter comprises the 4th resistance R4 and the 9th electric capacity C9, tenth electric capacity C10 and the 11 electric capacity C11, one end of the 4th described resistance R4 is connected with one end of the 11 electric capacity C11, the other end of the 4th resistance R4 is connected with one end of one end of the 9th electric capacity C9 and the tenth electric capacity C10, the other end of the 9th electric capacity C9, the other end of the tenth electric capacity C10 and the other end common ground of the 11 electric capacity C11, one end of 4th resistance R4 is as the input of filter, one end of 11 electric capacity C11 is as the output of filter, loop filter is by described input, output realization is bi-directionally connected with phase-locked loop chip.The value of the 4th resistance R4 is by decisions such as loop bandwidth, charge pump pump stream, gain factors, the value of the 9th electric capacity C9, the tenth electric capacity C10 and the 11 electric capacity C11 is determined jointly by the value of loop bandwidth and the 4th resistance R4, and the value of the 11 electric capacity C11 is about 12 times of the value that the 9th electric capacity C9 and the tenth electric capacity C10 combines.Described loop filter provides a stable outside tuning voltage for phase-locked loop chip.The signal that described phase-locked loop chip produces utilizes LTCC filter to carry out filtering after the second amplifier amplifies, this technology utilizes harmonic wave as reference frequency signal, can reduce phase noise, the integral frequency divisioil of low noise then can obtain excellent phase noise further.Like this, be integrated with the phase-locked loop chip of voltage controlled oscillator and LTCC filter with the use of, improve the integrated level of system and reduce the overall volume of system, also simplify the debugging of system, system reliability is strengthened, and consistency is better.
Claims (7)
1.
a kind of microwave local oscillation signal generator of small integrated, it is characterized in that: comprise crystal oscillator, LC band pass filter, first amplifier, be integrated with the phase-locked loop chip of voltage controlled oscillator, loop filter, second amplifier and LTCC filter, described crystal oscillator is connected to the input of LC band pass filter, the input of output termination first amplifier of described LC band pass filter, the described output of the first amplifier is connected with the input of phase-locked loop chip, the output of described phase-locked loop chip connects the input of the second amplifier, the output of the second described amplifier connects the input of LTCC filter, the output of described LTCC filter outwards exports local oscillation signal, described loop filter and phase-locked loop chip are bi-directionally connected.
2.
the microwave local oscillation signal generator of small integrated according to claim 1, is characterized in that the frequency of oscillation of described crystal oscillator is 10MHz.
3.
the microwave local oscillation signal generator of small integrated according to claim 1, is characterized in that the band of described LC band pass filter leads to the third harmonic frequencies 30MHz that working frequency points is the frequency of oscillation of crystal oscillator.
4.
the microwave local oscillation signal generator of small integrated according to claim 1, it is characterized in that described LC band pass filter comprises the first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, first inductance L 1 and the second inductance L 2, one end of the first described electric capacity C1 is connected with described crystal oscillator as the input of LC band pass filter, the other end of the first electric capacity C1 and one end of the first inductance L 1, one end of 4th electric capacity C4 and one end of the second electric capacity C2 connect, the other end of the second electric capacity C2 and one end of the second inductance L 2, one end of 5th electric capacity C5 and one end of the 3rd electric capacity C3 connect, the other end of the 3rd electric capacity C3 is connected with the first described amplifier as the output of LC band pass filter, the other end of the first inductance L 1, the other end of the 4th electric capacity C4, the other end of the second inductance L 2 and the other end common ground of the 5th electric capacity C5.
5.
the microwave local oscillation signal generator of small integrated according to claim 1, it is characterized in that the first described amplifier comprises crystal amplifier U1, first resistance R1, second resistance R2, 3rd resistance R3, 6th electric capacity C6, 7th electric capacity C7, 8th electric capacity C8 and the 3rd inductance L 3, one end of first resistance R1 is connected with one end of one end of the 3rd inductance L 3 and the 8th electric capacity C8, the input becoming the first amplifier is connected with LC band pass filter, the other end of the first resistance R1 is connected with one end of the second resistance R2 and 2 pin of crystal amplifier U1, 1 pin of crystal amplifier U1 is connected with one end of one end of the 3rd resistance R3 and the 6th electric capacity C6, 3 pin of crystal amplifier U1 and the other end of the 3rd inductance L 3, the other end of the 8th electric capacity C8 and one end of the 7th electric capacity C7 connect, the output that the other end of the 7th electric capacity C7 becomes amplifier is connected with phase-locked loop chip, the other end of the second resistance R2, the other end of the 3rd resistance R3 and the other end common ground of the 6th electric capacity C6.
6.
the microwave local oscillation signal generator of small integrated according to claim 1, is characterized in that the first described amplifier and the second amplifier are identical amplifier.
7.
the microwave local oscillation signal generator of small integrated according to claim 1, it is characterized in that described loop filter comprises the 4th resistance R4 and the 9th electric capacity C9, tenth electric capacity C10 and the 11 electric capacity C11, one end of the 4th described resistance R4 is connected with one end of the 11 electric capacity C11, the other end of the 4th resistance R4 is connected with one end of one end of the 9th electric capacity C9 and the tenth electric capacity C10, the other end of the 9th electric capacity C9, the other end of the tenth electric capacity C10 and the other end common ground of the 11 electric capacity C11, one end of 4th resistance R4 is connected with phase-locked loop chip as the input of filter, one end of 11 electric capacity C11 is connected with phase-locked loop chip as the output of filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420533700.2U CN204068933U (en) | 2014-09-17 | 2014-09-17 | The microwave local oscillation signal generator of small integrated |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420533700.2U CN204068933U (en) | 2014-09-17 | 2014-09-17 | The microwave local oscillation signal generator of small integrated |
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| CN204068933U true CN204068933U (en) | 2014-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429632A (en) * | 2014-09-17 | 2016-03-23 | 常熟市荣兴化纺有限责任公司 | Miniature integrated microwave local oscillator signal generator |
-
2014
- 2014-09-17 CN CN201420533700.2U patent/CN204068933U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429632A (en) * | 2014-09-17 | 2016-03-23 | 常熟市荣兴化纺有限责任公司 | Miniature integrated microwave local oscillator signal generator |
| CN105429632B (en) * | 2014-09-17 | 2018-11-23 | 江苏先云信息技术有限公司 | The microwave local signal generator of small integrated |
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Granted publication date: 20141231 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |