CN205596097U

CN205596097U - Frequency prewired circuit

Info

Publication number: CN205596097U
Application number: CN201620182748.2U
Authority: CN
Inventors: 张意
Original assignee: CHENGDU SEEKCON MICROWAVE COMMUNICATION Co Ltd
Current assignee: CHENGDU SEEKCON MICROWAVE COMMUNICATION Co Ltd
Priority date: 2016-03-10
Filing date: 2016-03-10
Publication date: 2016-09-21
Anticipated expiration: 2026-03-10

Abstract

The utility model provides a frequency prewired circuit, including major loop, pre -fixing loop and spread spectrum module, major loop and pre -fixing loop switch through the switch, the pre -fixing loop is including ware and frequency divider are divided to signal connection's second phase -locked loop, the 2nd loop filter, switch, voltage controlled oscillator, merit in proper order, frequency divider and second phase -locked loop signal connection, the major loop is including ware, first detector, first phase -locked loop, a loop filter and switch are divided to signal connection's voltage controlled oscillator, merit in proper order, direct digital formula frequency synthesizer and first phase -locked loop signal connection, ware signal connection is divided with the merit to the spread spectrum module. The utility model discloses all parts and circuit all adopt advance little packaging technology to produce the assembly, have reduced the circuit size greatly, have characteristics such as small, stable performance, index uniformity height, have good input/output simultaneously to mate, are fit for the mass production, and manufacturing cost reduces greatly.

Description

A kind of frequency preset circuit

Technical field

This utility model relates to frequency synthesis technique field, is specifically related to a kind of frequency preset circuit.

Background technology

In electronic warfare, radar, communication system, frequency source is widely used as local oscillator, and more and more becomes the core component in system, is directly connected to the quality of system index.

Frequency synthesizer technique is one and has highly difficult advanced circuit engineering, its range of application is the widest, it is required for applying frequency source technology including communication system, navigation system, radar, space electronic technology and instrument, instrument etc., and the performance indications of frequency source directly affect the performance indications of complete machine.This technology is also mainly grasped by developed country at present, therefore their electronic system performance is more preferable, make the instruments such as their spectrum analyzer, signal source, vector network analyzer can dump to China's high price, and the good frequency source of performance is exactly the key core technology of these instrument.China, as far back as the beginning of the seventies, just has institute that frequency synthesis technique expands development work, and achieves certain achievement, but because technical difficulty is big and some other reason makes the several institutes studied in early days the most not adhere to getting off.To the domestic whole machine study institute eighties because of requirement of engineering, set up the development team of oneself the most one after another.Although developing the team struggles in more than 20 year through these, having been achieved for some achievements in frequency source technology China, but China's frequency synthesis technique, still differs farther out so far compared with developed countries.

We it has been generally acknowledged that phase noise and spurious signal all deteriorate with 20logN, and optimal situation is N=1, makes phase noise and spurious reduction not deteriorate, thus obtains optimal frequency synthesized signal.There is the inherent shortcoming of the aspects such as spuious, volume in existing wideband frequency combiner circuit, is difficult to be widely used.

Utility model content

The purpose of this utility model is for the deficiencies in the prior art, it is provided that a kind of frequency preset circuit, this frequency preset circuit can solve the problems referred to above well.

For reaching above-mentioned requirements, this utility model adopts the technical scheme that: providing a kind of frequency preset circuit, this frequency preset circuit includes that major loop, prelock loop and spread spectrum module, described major loop and prelock loop are switched over by switch；Described prelock loop includes that the second phaselocked loop, the second loop filter, switch, voltage controlled oscillator, power splitter and the frequency divider that signal connects successively, described frequency divider and the second phaselocked loop signal connect；Described major loop includes that voltage controlled oscillator, power splitter, frequency mixer, the first phaselocked loop, the first loop filter and the switch that signal connects successively, described Direct Digital Synthesizer and the first phaselocked loop signal connect；Described spread spectrum module is connected with power splitter signal；Switch connection prelock loop, input signal from the second phaselocked loop input and forms feedback signal through prelock loop, and voltage controlled oscillator is locked in required frequency by described feedback signal in advance；Switching switch connection major loop, the described feedback signal of voltage controlled oscillator output is phase-locked by carrying out one to one with the signal of Direct Digital Synthesizer output after power splitter and frequency mixer output, obtain super Low phase noise frequency signal, by exporting after spread spectrum module extension frequency.

This frequency preset circuit has the advantage that as follows:

(1) all parts and circuit all use the microwave assembly technology of advanced person to carry out producing assembling, substantially reduce circuit size, have that volume is little, stable performance, indicator consilience high, there is good input and output coupling simultaneously, it is suitable for mass production, production cost is greatly reduced, it is adaptable in all kinds of microwave systems such as radar, electronic countermeasure, satellite communication；

(2) achieve the 1:1 phase demodulation frequency synthesis of 2GHz ~ 20GHz broadband, obtain super Low phase noise frequency signal, can be good at working frequency range internal stability, operating temperature range is wide, has wide application prospect.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing further understanding of the present application, constitute the part of the application, use identical reference number to represent same or analogous part in the drawings, the schematic description and description of the application is used for explaining the application, is not intended that the improper restriction to the application.In the accompanying drawings:

Fig. 1 is schematic diagram of the present utility model.

Wherein: 1, the second phaselocked loop；2, the second loop filter；3, frequency divider；4, switch；5, voltage controlled oscillator；6, power splitter；7, spread spectrum module；8, the first loop filter；9, the first phaselocked loop；10, frequency mixer；11, Direct Digital Synthesizer.

Detailed description of the invention

For making the purpose of the application, technical scheme and advantage clearer, below in conjunction with drawings and the specific embodiments, the application is described in further detail.

In the following description, to " embodiment ", " embodiment ", " example ", " example " etc. quote the embodiment showing so to describe or example can include special characteristic, structure, characteristic, character, element or limit, but the most each embodiment or example necessarily include special characteristic, structure, characteristic, character, element or limit.It addition, reuse phrase " according to an embodiment of the application " although it is possible to refer to identical embodiment, but it is not necessarily referring to identical embodiment.

For the sake of simplicity, eliminate in below describing and well known to a person skilled in the art some technical characteristic.

An embodiment according to the application, it is provided that a kind of frequency preset circuit, as it is shown in figure 1, include that major loop, prelock loop and spread spectrum module 7, described major loop and prelock loop are switched over by switch 4；Described prelock loop includes second phaselocked loop the 1, second loop filter 2, switch 4, voltage controlled oscillator 5, power splitter 6 and the frequency divider 3 that signal connects successively, and described frequency divider 3 is connected with the second phaselocked loop 1 signal；Described major loop includes voltage controlled oscillator 5, power splitter 6, frequency mixer the 10, first phaselocked loop the 9, first loop filter 8 and the switch 4 that signal connects successively, and described Direct Digital Synthesizer 11 is connected with the first phaselocked loop 9 signal；Described spread spectrum module 7 is connected with power splitter 6 signal；Switch 4 connection prelock loop, input signal inputs from the second phaselocked loop 1 and forms feedback signal through prelock loop, and voltage controlled oscillator 5 is locked in required frequency by described feedback signal in advance；Switching switch 4 connection major loop, the described feedback signal of voltage controlled oscillator 5 output is phase-locked by carrying out 1:1 with the signal of Direct Digital Synthesizer 11 output after power splitter 6 and frequency mixer 10 output, obtain super Low phase noise frequency signal, by exporting after spread spectrum module 7 extension frequency.

An embodiment according to the application, the standardized module that second phaselocked loop the 1, second loop filter 2, voltage controlled oscillator 5, power splitter 6, frequency divider 3, frequency mixer the 10, first phaselocked loop the 9, first loop filter 8, Direct Digital Synthesizer 11 and spread spectrum module 7 all use input, output-resistor to be 50 ohm.

An embodiment according to the application, second phaselocked loop the 1, second loop filter 2, switch 4, voltage controlled oscillator 5, power splitter 6, frequency divider 3, frequency mixer the 10, first phaselocked loop the 9, first loop filter 8, Direct Digital Synthesizer 11 and spread spectrum module 7 all use the microwave assembly technology of advanced person to assemble.

Embodiment described above only represents several embodiments of the present utility model, and it describes more concrete and detailed, but can not be interpreted as the restriction to this utility model scope.It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into this utility model protection domain.Protection domain the most of the present utility model should be as the criterion with described claim.

Claims

1. a frequency preset circuit, it is characterised in that: include that major loop, prelock loop and spread spectrum module (7), described major loop and prelock loop are switched over by switch (4)；Described prelock loop includes the second phaselocked loop (1), the second loop filter (2), switch (4), voltage controlled oscillator (5), power splitter (6) and the frequency divider (3) that signal connects successively, and described frequency divider (3) is connected with the second phaselocked loop (1) signal；Described major loop includes voltage controlled oscillator (5), power splitter (6), frequency mixer (10), the first phaselocked loop (9), the first loop filter (8) and the switch (4) that signal connects successively, and Direct Digital Synthesizer (11) is connected with the first phaselocked loop (9) signal；Described spread spectrum module (7) is connected with power splitter (6) signal；Prelock loop connected by switch (4), and input signal from the second phaselocked loop (1) input and forms feedback signal through prelock loop, and voltage controlled oscillator (5) is locked in required frequency by described feedback signal in advance；Major loop is connected in switching switch (4), it is phase-locked that the described feedback signal that voltage controlled oscillator (5) exports carries out one to one by the signal exported with Direct Digital Synthesizer (11) after power splitter (6) and frequency mixer (10) output, obtain super Low phase noise frequency signal, by exporting after spread spectrum module (7) extension frequency.

Frequency preset circuit the most according to claim 1, it is characterised in that: the standardized module that described second phaselocked loop (1), the second loop filter (2), voltage controlled oscillator (5), power splitter (6), frequency divider (3), frequency mixer (10), the first phaselocked loop (9), the first loop filter (8), Direct Digital Synthesizer (11) and spread spectrum module (7) all use input, output-resistor to be 50 ohm.

Frequency preset circuit the most according to claim 1, it is characterised in that: described second phaselocked loop (1), the second loop filter (2), switch (4), voltage controlled oscillator (5), power splitter (6), frequency divider (3), frequency mixer (10), the first phaselocked loop (9), the first loop filter (8), Direct Digital Synthesizer (11) and spread spectrum module (7) all use the microwave assembly technology of advanced person to assemble.