CN207677709U - A kind of broadband frequency synthesizer based on cascade connection type PLL structures - Google Patents
A kind of broadband frequency synthesizer based on cascade connection type PLL structures Download PDFInfo
- Publication number
- CN207677709U CN207677709U CN201820214069.8U CN201820214069U CN207677709U CN 207677709 U CN207677709 U CN 207677709U CN 201820214069 U CN201820214069 U CN 201820214069U CN 207677709 U CN207677709 U CN 207677709U
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- frequency synthesizer
- synthesizer
- connection type
- 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.)
- Active
Links
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The utility model discloses a kind of broadband frequency synthesizers based on cascade connection type PLL structures, which is characterized in that including OCXO crystal oscillators（1）, the OCXO crystal oscillators（1）On be connected with variable output decimal frequency divider in turn（2）, bandpass filter（3）, radio frequency amplifier（4）And frequency synthesizer（5）, the OCXO crystal oscillators（1）Export reference signal, the variable output decimal frequency divider（2）Export dominant frequency signal（F1）With auxiliary frequency signal（F2）, dominant frequency signal（F1）With auxiliary frequency signal（F2）Pass through bandpass filter（3）Enter radio frequency amplifier after filtering（4）, amplified is frequency synthesizer（5）Reference is provided.The utility model is simple in structure, function admirable, reliability is high, achievees the effect that small stepping, low spurious wideband frequency, meets Current electronic confrontation, demand of the fields such as instrument and meter to frequency synthesizer.
Description
Technical field
The small stepping that the utility model is related to a kind of based on cascade connection type PLL structures, low spurious wideband frequency synthetic source.The width
Can be as the first frequency sweep local oscillator of broadband receiver with source, while also can be used as a signal source and using, frequency microwave technology
Field.
Background technology
In frequency microwave field, frequency synthesizer is frequently referred to the heart of electronic system and equipment.Broadband receiver, frequency spectrum prison
Surveying instrument etc. is required for broadband frequency synthesizer as frequency sweep local oscillator.Wherein, minimum frequency hopping stepping and it is spuious be broadband frequency sweep local oscillator
Most important two indices.
Existing frequency synthesizer device inside mostly uses greatly SDM structures, can meet broadband, the requirement of small stepping, but
Have the shortcomings that integral boundary is spuious high.
Utility model content
The utility model is intended to utilize existing commercial frequency synthesizer device, and design is a kind of to be based on cascade connection type PLL structures
Small stepping, low spurious broadband frequency synthesizer, scheme is simple, compact-sized, be suitble to miniaturization.
To achieve the above object, the utility model provides the following technical solutions：
A kind of broadband frequency synthesizer based on cascade connection type PLL structures, including OCXO crystal oscillators, on the OCXO crystal oscillators successively
It is connected with variable output decimal frequency divider, bandpass filter, radio frequency amplifier and frequency synthesizer, the OCXO crystal oscillators output ginseng
Signal is examined, the variable output decimal frequency divider output dominant frequency signal and auxiliary frequency signal, dominant frequency signal and auxiliary frequency signal pass through band
Enter radio frequency amplifier after bandpass filter filtering, it is amplified to provide reference for frequency synthesizer.
The variable output decimal frequency divider output frequency is variable.
The variable output decimal frequency divider and frequency synthesizer are all made of integrated chip structure.
Advantageous effect：Compared with prior art, the utility model is simple in structure, function admirable, reliability is high, reaches small step
Into the effect of, low spurious wideband frequency, meet Current electronic confrontation, demand of the fields such as instrument and meter to frequency synthesizer.
Description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality
Novel embodiment for explaining the utility model, does not constitute limitations of the present invention together.
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 be second level PLL reference frequency be F1 when, basic frequency synthesizer output integral boundary it is spuious（IBS）Show
It is intended to.
Figure label：1, OCXO crystal oscillators, 2, variable output decimal frequency divider, 3, bandpass filter, 4, radio frequency amplifier, 5,
Frequency synthesizer, F1, dominant frequency signal, F2, auxiliary frequency signal.
Specific implementation mode
The preferred embodiment of the utility model is illustrated below in conjunction with attached drawing, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
As shown in Figure 1, a kind of broadband frequency synthesizer based on cascade connection type PLL structures, including OCXO crystal oscillators 1, OCXO are brilliant
It shakes and is connected with variable output decimal frequency divider 2, bandpass filter 3, radio frequency amplifier 4 and frequency synthesizer 5, OCXO on 1 in turn
Crystal oscillator 1 exports reference signal, can be changed output decimal frequency divider 2 export dominant frequency signal F1 and auxiliary frequency signal F2, dominant frequency signal F1 and
Auxiliary frequency signal F2 enters radio frequency amplifier 4 after being filtered by bandpass filter 3, amplified to provide reference for frequency synthesizer 5.
Variable output decimal frequency divider 2 and frequency synthesizer 5 are all made of integrated chip structure.
As shown in Fig. 2, the output frequency of variable output decimal frequency divider 2 is variable, dominant frequency signal is reasonably selected as needed
F1 and auxiliary frequency signal F2, it is generally the case that references of the dominant frequency signal F1 as frequency synthesizer 5, it is final when frequency synthesizer 5
When output frequency is in the integral boundary spuious areas adjacent of dominant frequency signal F1 frequencies（IBS zone）, higher, ring spuious at this time
Path filter cannot effectively filter out that this is spuious, therefore switch reference frequency to auxiliary frequency signal F2 frequencies, make frequency synthesizer 5 most
Whole output frequency not in the spuious areas adjacent of integral boundary of auxiliary frequency signal F2 frequencies, so as to improve or to eliminate integral boundary miscellaneous
It dissipates, improves the spuious index of system.
Claims (3)
1. a kind of broadband frequency synthesizer based on cascade connection type PLL structures, which is characterized in that including OCXO crystal oscillators（1）, described
OCXO crystal oscillators（1）On be connected with variable output decimal frequency divider in turn（2）, bandpass filter（3）, radio frequency amplifier（4）And frequency
Rate synthesizer（5）, the OCXO crystal oscillators（1）Export reference signal, the variable output decimal frequency divider（2）Export dominant frequency signal
（F1）With auxiliary frequency signal（F2）, dominant frequency signal（F1）With auxiliary frequency signal（F2）Pass through bandpass filter（3）Enter radio frequency after filtering
Amplifier（4）, amplified is frequency synthesizer（5）Reference is provided.
2. a kind of broadband frequency synthesizer based on cascade connection type PLL structures according to claim 1, it is characterised in that：Institute
State variable output decimal frequency divider（2）Output frequency is variable.
3. a kind of broadband frequency synthesizer based on cascade connection type PLL structures according to claim 1, it is characterised in that：Institute
State variable output decimal frequency divider（2）And frequency synthesizer（5）It is all made of integrated chip structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214069.8U CN207677709U (en) | 2018-02-07 | 2018-02-07 | A kind of broadband frequency synthesizer based on cascade connection type PLL structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214069.8U CN207677709U (en) | 2018-02-07 | 2018-02-07 | A kind of broadband frequency synthesizer based on cascade connection type PLL structures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207677709U true CN207677709U (en) | 2018-07-31 |
Family
ID=62973798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820214069.8U Active CN207677709U (en) | 2018-02-07 | 2018-02-07 | A kind of broadband frequency synthesizer based on cascade connection type PLL structures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207677709U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176928A (en) * | 2019-05-29 | 2019-08-27 | 江苏华讯电子技术有限公司 | A kind of extra small stepping based on DDS and PLL structure, low spurious broadband frequency synthesizer |
-
2018
- 2018-02-07 CN CN201820214069.8U patent/CN207677709U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176928A (en) * | 2019-05-29 | 2019-08-27 | 江苏华讯电子技术有限公司 | A kind of extra small stepping based on DDS and PLL structure, low spurious broadband frequency synthesizer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108736889A (en) | Low spurious Low phase noise frequency synthesizer | |
| CN105429641B (en) | A kind of error lock prevention high performance wideband Microwave Frequency Synthesizer | |
| CN103795410A (en) | Broadband frequency agility frequency source based on double phase-locked loops | |
| CN111106830B (en) | Fast and agile broadband frequency synthesizer | |
| CN103490777A (en) | Low spurious frequency synthesizer | |
| CN116170009B (en) | Broadband, low phase noise and fine stepping frequency source generating circuit | |
| CN104833854B (en) | A kind of sweep frequency type spectrum analyzer and its frequency sweeping method | |
| CN206164503U (en) | Low stray microwave frequency synthesizer in miniaturized broadband | |
| CN201298839Y (en) | Phaselocking frequency multiplier of rubidium frequency scale | |
| CN108988857A (en) | A kind of broadband low phase noise frequency synthesizer and method based on optical-electronic oscillator | |
| CN110289858B (en) | Broadband fine stepping agile frequency conversion combination system | |
| CN207677709U (en) | A kind of broadband frequency synthesizer based on cascade connection type PLL structures | |
| CN205670764U (en) | A kind of reference source system utilizing phase-locked loop pll and frequency multiplication | |
| CN203219288U (en) | Three-level superheterodyne receiver and local oscillation circuit thereof | |
| CN117081583A (en) | Frequency source for improving phase noise | |
| CN105356878B (en) | A kind of implementation method and device of improved tricyclic wideband frequency synthesizer | |
| CN209710072U (en) | A kind of super Low phase noise broadband frequency source | |
| CN217879614U (en) | Civil aviation DME receiver circuit | |
| CN204836137U (en) | Frequency synthesizer | |
| CN208445546U (en) | A kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator | |
| CN208226994U (en) | A kind of thin stepping low noise frequency source in broadband | |
| CN104702279A (en) | Frequency synthesizer of phase-locked loop | |
| CN112671399B (en) | Ultra-wideband low-phase-noise frequency synthesizer | |
| CN207339815U (en) | Ultralow phase noise frequency synthesizer | |
| CN211296710U (en) | High-performance phase-locked digital frequency synthesizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |