CN207910759U

CN207910759U - Frequency synthesizer

Info

Publication number: CN207910759U
Application number: CN201820536866.8U
Authority: CN
Inventors: 谭荣华
Original assignee: Chengdu Mingda Electronic Ltd By Share Ltd
Current assignee: Chengdu Mingda Electronic Ltd By Share Ltd
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2018-09-25
Anticipated expiration: 2028-04-16

Abstract

The utility model discloses a kind of frequency synthesizers.The frequency synthesizer includes control instruction input interface, at least two branch circuits, RF switch, frequency hopping output interface；Control instruction input interface is connect at least two branch circuits, and at least two branch circuits are connect with the RF switch, and the RF switch is connect with the frequency hopping output interface；Wherein, the branch circuit includes oscillator, the first frequency divider, single phase-locked loop circuit, the second frequency divider, the oscillator is connect with first frequency divider, the control instruction input interface is connect with first frequency divider, single phase-locked loop circuit and second frequency divider, first frequency divider is connect with single phase-locked loop circuit, the list phase-locked loop circuit is connect with second frequency divider, and second frequency divider is connect with the RF switch.The utility model can ensure that frequency synthesizer realizes broadband jump and high-resolution soon, and realize preferable phase noise and spurious reduction.

Description

Frequency synthesizer

Technical field

The utility model is related to electronic technology field, more particularly to a kind of frequency synthesizer.

Background technology

In traditional frequency-hopping communication system, there are many realization method of frequency synthesizer (frequency hopper), and common practice has Two kinds, one is single phaselocked loop (PLL) frequency synthesis, and one is direct digital frequency synthesizer (DDS).Traditional design frequency Rate conversion speed is already close to the limit, and it also has the problems such as resolution ratio is relatively low, spurious reduction is poor.

Therefore, it is necessary to propose a kind of new technical solution, to solve the above technical problems.

Utility model content

The purpose of this utility model is to provide a kind of frequency synthesizer, it can ensure that frequency synthesizer realizes that broadband is jumped soon And high-resolution, and realize preferable phase noise and spurious reduction.

To solve the above problems, the technical solution of the utility model is as follows：

A kind of frequency synthesizer, the frequency synthesizer include control instruction input interface, at least two branch circuits, radio frequency Switch, frequency hopping output interface；Control instruction input interface is connect at least two branch circuits, at least two branch circuits It is connect with the RF switch, the RF switch is connect with the frequency hopping output interface；Wherein, the branch circuit includes shaking Device, the first frequency divider, single phase-locked loop circuit, the second frequency divider are swung, the oscillator is connect with first frequency divider, the control Instruction input interface processed is connect with first frequency divider, single phase-locked loop circuit and second frequency divider, and described first Frequency divider is connect with single phase-locked loop circuit, and the list phase-locked loop circuit is connect with second frequency divider, described second point Frequency device is connect with the RF switch.

In said frequencies synthesizer, it is described list phase-locked loop circuit include phase discriminator, loop filter, voltage controlled oscillator and Third frequency divider；The phase discriminator is connect with the loop filter, and the voltage controlled oscillator is connect with the third frequency divider, The third frequency divider is connect with the phase discriminator.

In said frequencies synthesizer, the control instruction input interface and the third in single phase-locked loop circuit Frequency divider connects.

In said frequencies synthesizer, first frequency divider connects with the phase discriminator in single phase-locked loop circuit It connects.

In said frequencies synthesizer, the voltage controlled oscillator in the list phase-locked loop circuit and second frequency divider Connection.

Compared with the prior art, the utility model can ensure that frequency synthesizer realizes broadband jump and high-resolution soon, and realize Preferable phase noise and spurious reduction.

For the above of the utility model can be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate institute's attached drawing Formula is described in detail below.

Description of the drawings

Fig. 1 is the schematic diagram of the frequency synthesizer of the utility model；

Fig. 2 is the schematic diagram of single phase-locked loop circuit in frequency synthesizer shown in FIG. 1.

Specific implementation mode

Word used in this specification " embodiment " means example, example or illustration.In addition, this specification and appended power Profit require used in article " one " can usually be interpreted " one or more ", unless specified otherwise or from context It can understand and determine singulative.

The frequency synthesizer of the utility model include control instruction input interface 101, at least two branch circuits 102, RF switch 103, frequency hopping output interface 104；

Control instruction input interface 101 is connect at least two branch circuits 102, at least two branch circuits 102 It is connect with the RF switch 103, the RF switch 103 is connect with the frequency hopping output interface 104；

Wherein, the branch circuit 102 includes oscillator 1021, the first frequency divider 1022, single phase-locked loop circuit 1023, the Two-divider 1024, the oscillator 1021 are connect with first frequency divider 1022, the control instruction input interface 101 It is connect with first frequency divider 1022, single phase-locked loop circuit 1023 and second frequency divider 1024, described first point Frequency device 1022 is connect with single phase-locked loop circuit 1023, and the list phase-locked loop circuit 1023 connects with second frequency divider 1024 It connects, second frequency divider 1024 is connect with the RF switch 103.

The list phase-locked loop circuit 1023 includes phase discriminator 10231, loop filter 10232,10233 and of voltage controlled oscillator Third frequency divider 10234；

The phase discriminator 10231 is connect with the loop filter 10232, the voltage controlled oscillator 10233 and described the Tri-frequency divider 10234 connects, and the third frequency divider 10234 is connect with the phase discriminator 10231.

The control instruction input interface 101 and the third frequency divider 10234 in single phase-locked loop circuit 1023 Connection.

First frequency divider 1022 is connect with the phase discriminator 10231 in single phase-locked loop circuit 1023.

The voltage controlled oscillator 10233 in the list phase-locked loop circuit 1023 is connect with second frequency divider 1024.

Through the above technical solutions, the utility model can ensure that frequency synthesizer realizes broadband jump and high-resolution soon, and Realize preferable phase noise and spurious reduction.

The above is only the utility model preferred embodiment, but the scope of protection of the utility model is not limited to This, any transformation carried out based on technical solution provided by the utility model and utility model design and replacement should all be covered In the scope of protection of the utility model.

Claims

1. a kind of frequency synthesizer, which is characterized in that the frequency synthesizer includes control instruction input interface, at least two branches Circuit, RF switch, frequency hopping output interface；

Control instruction input interface is connect at least two branch circuits, at least two branch circuits and the RF switch Connection, the RF switch are connect with the frequency hopping output interface；

Wherein, the branch circuit includes oscillator, the first frequency divider, single phase-locked loop circuit, the second frequency divider, the oscillator Connect with first frequency divider, the control instruction input interface and first frequency divider, single phase-locked loop circuit and The second frequency divider connection, first frequency divider are connect with single phase-locked loop circuit, the list phase-locked loop circuit and institute The connection of the second frequency divider is stated, second frequency divider is connect with the RF switch.

2. frequency synthesizer according to claim 1, which is characterized in that the list phase-locked loop circuit includes phase discriminator, ring Path filter, voltage controlled oscillator and third frequency divider；

The phase discriminator is connect with the loop filter, and the loop filter is connect with the voltage controlled oscillator, the pressure Control oscillator is connect with the third frequency divider, and the third frequency divider is connect with the phase discriminator.

3. frequency synthesizer according to claim 2, which is characterized in that the control instruction input interface and the monolock Third frequency divider connection in phase loop circuit.

4. frequency synthesizer according to claim 2, which is characterized in that first frequency divider and single phaselocked loop electricity Phase discriminator connection in road.

5. frequency synthesizer according to claim 2, which is characterized in that described in the list phase-locked loop circuit voltage-controlled shakes Device is swung to connect with second frequency divider.