CN209642643U

CN209642643U - A kind of broadband direct synthesizer

Info

Publication number: CN209642643U
Application number: CN201920501663.XU
Authority: CN
Inventors: 马德科
Original assignee: Chengdu Yi Chuang Technology Co Ltd
Current assignee: Chengdu Yi Chuang Technology Co Ltd
Priority date: 2019-04-15
Filing date: 2019-04-15
Publication date: 2019-11-15
Anticipated expiration: 2029-04-15

Abstract

The utility model provides a kind of broadband direct synthesizer, and module occurs using comb spectrum and receives the clock signal of a setpoint frequency, and generates the multiple harmonic component of the clock signal to form wideband baseband signal；First output channel occurs module with comb spectrum and connect, switch filtering module carries out switch filtering to the wideband baseband signal to form frequency agility signal, second output channel occurs module with the comb spectrum and connect, and the first bandpass filter carries out bandpass filtering to the wideband baseband signal to be contrasted signal.The multiple harmonic component that module directly generates clock signal occurs by comb spectrum for the utility model, then each frequency range is taken out by switch filtering module and generates frequency agility signal to export, simplify structure, it reduces costs, and switch filtering is carried out to the wideband baseband signal using switch filtering module, guarantees that output signal has excellent spurious performance.

Description

A kind of broadband direct synthesizer

Technical field

The utility model relates to field of communication technology more particularly to a kind of broadband direct synthesizers.

Background technique

Signal generator is known as frequency switching time, agile from the time that a certain output frequency is transformed into another output frequency Frequency signal generator can carry out fast frequency switching, be mainly used in the electronic countermeasures such as frequency-agile radar, frequency hopping communications field.

There are mainly three types of the technical methods of frequency agility signal generator: direct analog frequency synthesis, indirect frequency synthesis, directly Connect Digital Frequency Synthesize method.The frequency agility signal generator of early stage mostly uses direct analog frequency synthetic method, and this technology uses Can a large amount of highly stable crystal oscillator required final frequency obtained by the methods of mixing, frequency multiplication, frequency dividing, bandpass filtering, Its distinguishing feature is that frequency error factor speed is fast, phase noise is low, output frequency is high, reliable operation, is that more satisfactory simulation is prompt Become synthesized signal generator, after solving phase correlation, estimation can obtain more extensive in electro-magnetic environment simulator Using, but a large amount of crystal oscillator, frequency mixer, frequency multiplier, frequency divider and narrow band filter are needed, cause equipment volume huge Greatly, cost is high, is difficult to integrate, and spurious signal is difficult to filter out.

Utility model content

The purpose of this utility model is to provide a kind of broadband direct synthesizers, to solve existing frequency agility signal The problem of generator is bulky, cost is high, is difficult to integrate, and spurious signal is difficult to filter out.

In order to achieve the above object, the utility model provides a kind of broadband direct synthesizer, comprising:

Module occurs for comb spectrum, for receiving the clock signal of a setpoint frequency, and generates the multiple of the clock signal Harmonic component is to form wideband baseband signal；

First output channel occurs module with the comb spectrum and connect, and switch filter is provided in first output channel Wave module and amplification module, the switch filtering module carry out switch filtering to the wideband baseband signal to form frequency agility letter Number；

Second output channel occurs module with the comb spectrum and connect, is provided with first band in second output channel Bandpass filter and the first amplifier, first bandpass filter carry out bandpass filtering to the wideband baseband signal to be formed pair Compare signal.

Optionally, it includes the second amplifier and comb spectrum generator, second amplifier that module, which occurs, for the comb spectrum Drive amplification is carried out to the clock signal and is inputted in the comb spectrum generator, when the comb spectrum generator generates described The multiple harmonic component of clock signal.

Optionally, the broadband direct synthesizer further includes a power splitter, one end of the power splitter and the comb Shape composes generator connection, and the other end is connect with first output channel and second output channel.

Optionally, the switch filtering module includes two high speed high isolation switches and is located at two high speed high isolations A plurality of filtering channel in switch is provided with one second bandpass filter, and every filter in every filtering channel The centre frequency of the second bandpass filter in wave channel is different.

Optionally, the frequency of the clock signal is 2GHz, and the frequency range of the power splitter is 8GHz~22GHz.

Optionally, the filtering channel has 4, and the frequency range of 4 filtering channels is respectively 16GHz ± 2GHz, 18GHz ± 2GHz, 20GHz ± 2GHz and 22GHz ± 2GHz.

Optionally, the power of the signal of the first output channel output is greater than or equal to 70dB.

In broadband direct synthesizer provided by the utility model, module occurs using comb spectrum and receives a setting frequency The clock signal of rate, and the multiple harmonic component of the clock signal is generated to form wideband baseband signal；First output channel Module occurs with comb spectrum to connect, switch filtering module carries out switch filtering to the wideband baseband signal to form frequency agility letter Number, the second output channel occurs module with the comb spectrum and connect, and the first bandpass filter carries out the wideband baseband signal Bandpass filtering is to be contrasted signal.The multiple harmonic that module directly generates clock signal occurs by comb spectrum for the utility model Then component takes out each frequency range by switch filtering module and generates frequency agility signal to export, simplifies structure, reduce into This, and switch filtering is carried out to the wideband baseband signal using switch filtering module, it is excellent to guarantee that output signal has Spurious performance.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for the broadband direct synthesizer that utility model embodiment provides；

Wherein, appended drawing reference are as follows:

Module occurs for 1- comb spectrum；The second amplifier of 11-；12- comb spectrum generator；2- power splitter；The output of 3- first is logical Road；31- first band pass filtering unit；32- the second bandpass filtering unit；33- third bandpass filtering unit；The filter of the 4th band logical of 34- Wave unit；35- amplification module；The second output channel of 4-；The first bandpass filter of 41-；The first amplifier of 42-；

K1- the first high speed high isolation switch；The switch of second high speed high isolation described in K2-.

Specific embodiment

Specific embodiment of the present utility model is described in more detail below in conjunction with schematic diagram.It is retouched according to following It states, will be become apparent from feature the advantages of the utility model.It should be noted that attached drawing is all made of very simplified form and uses Non-accurate ratio, only to convenient, lucidly aid illustration the utility model embodiment purpose.

As shown in Figure 1, present embodiments providing a kind of broadband direct synthesizer, can produce from a certain output frequency It is quickly switched into another output frequency, frequency range is relatively wide, can cover 16GHz~22GHz frequency range, and can be with For wide-band spread spectrum, comprising:

Module 1 occurs for comb spectrum, for receiving the clock signal of a setpoint frequency, and generates the multiple of the clock signal For harmonic component to form wideband baseband signal, the frequency of the clock signal is, for example, 2GHz, and it includes that module 1, which occurs, for comb spectrum Two amplifiers 11 and comb spectrum generator 12, the clock signal can first pass through the second amplifier 11 and carry out drive amplification, so After input in the comb spectrum generator 12, to generate the n times harmonic component of 2GHz；

First output channel 3 occurs module 1 with the comb spectrum and connect, is provided with switch in first output channel 3 Filter module and amplification module 35, the switch filtering module include the first high speed high isolation switch K1, the second high speed high isolation Switch K2 and a plurality of filtering between the first high speed high isolation switch K1 and the second high speed high isolation switch K2 Channel, in the present embodiment, the filtering channel has 4, the frequency range of 4 filtering channels be respectively 16GHz ± 2GHz, 18GHz ± 2GHz, 20GHz ± 2GHz and 22GHz ± 2GHz are respectively arranged with the second bandpass filtering in 4 filtering channels Device enables setting first band pass filtering unit 31, the filter of 18GHz ± 2GHz frequency band in 16GHz ± 2GHz frequency band for the ease of distinguishing Second bandpass filtering unit 32 is set in wave channel, third bandpass filtering list is set in the filtering channel of 20GHz ± 2GHz frequency band In the filtering channel of member 32,22GHz ± 2GHz frequency band be arranged the 4th bandpass filtering unit 32,4 and filtering channel respectively to respective The spuious and multiple intermodulation component of frequency band is filtered to form frequency agility signal, and it is excellent spuious to guarantee that frequency agility signal has Performance；

Second output channel 4 occurs module 1 with the comb spectrum and connect, is provided with first in second output channel 4 Bandpass filter 41 and the first amplifier 42, first bandpass filter 41 carry out bandpass filtering to the wideband baseband signal To be contrasted signal, for example, it is 20GHz that first bandpass filter 41, which can select frequency, through first amplifier It is exported after 42 amplifications.

Optionally, the broadband direct synthesizer further includes a power splitter 2, one end of the power splitter 2 with it is described Comb spectrum generator 12 connects, and the other end is connect with first output channel 3 and second output channel 4, is used for institute The signal for stating the generation of comb spectrum generator 12 carries out power distribution, in the present embodiment, the frequency range of the power splitter 2 be 8GHz~ 22GHz。

In the present embodiment, since the harmonic component that the generation of module 1 occurs for pectination is bigger, in order to guarantee each frequency of output The amplification module 35 can be set after switch filtering module in the spurious performance of rate point, will by the switch filtering mould it Frequency agility signal power afterwards amplifies, and reaches certain amplitude range, convenient to use in multiple broadband application occasions, and described the The power of the signal of one output channel 3 output is greater than or equal to 70dB.

The design objective of the switch filtering module can be as follows:

Rf-in- > rf-out parameter	Design objective
		Pass band insertion loss	≤3dB
16GHz Out-of-band rejection@16G ± 2G	70dB
		18GHz Out-of-band rejection@18G ± 2G	70dB
20GHz Out-of-band rejection@20G ± 2G	70dB
		22GHz Out-of-band rejection@22G ± 2G	70dB
Switching speed	100ns
		Output power	> 15dBm
Output factors	> 65dBc

The design objective that module occurs for the comb spectrum can be as follows:

Parameter	Design objective
		2GHz input power	0~5dBm
Output frequency	N*2G, N=1,2,3,4 ... ..
		Output signal power	> -20dBm

To sum up, in broadband direct synthesizer provided by the embodiment of the utility model, module occurs using comb spectrum The clock signal of a setpoint frequency is received, and generates the multiple harmonic component of the clock signal to form wideband baseband signal； First output channel and comb spectrum occur module and connects, switch filtering module to wideband baseband signal progress switch filtering with Frequency agility signal is formed, the second output channel occurs module with the comb spectrum and connect, and the first bandpass filter is to the broadband Baseband signal carries out bandpass filtering to be contrasted signal.The utility model occurs module by comb spectrum and directly generates clock letter Number multiple harmonic component, each frequency range is then taken out by switch filtering module and generates frequency agility signal to export, is simplified Structure reduces costs, and carries out switch filtering to the wideband baseband signal using switch filtering module, guarantees output letter Number have excellent spurious performance.

The preferred embodiment that above are only the utility model, does not play the role of any restrictions to the utility model. Any person of ordinary skill in the field, in the range of not departing from the technical solution of the utility model, to the utility model The technical solution and technology contents of exposure make the variation such as any type of equivalent replacement or modification, belong to without departing from the utility model Technical solution content, still fall within the protection scope of the utility model.

Claims

1. a kind of broadband direct synthesizer characterized by comprising

Module occurs for comb spectrum, for receiving the clock signal of a setpoint frequency, and generates the multiple harmonic of the clock signal Component is to form wideband baseband signal；

First output channel occurs module with the comb spectrum and connect, is provided with switch filtering mould in first output channel Block and amplification module, the switch filtering module carry out switch filtering to the wideband baseband signal to form frequency agility signal；

Second output channel occurs module with the comb spectrum and connect, and the filter of the first band logical is provided in second output channel Wave device and the first amplifier, first bandpass filter carry out bandpass filtering to the wideband baseband signal to be contrasted letter Number.

2. broadband direct synthesizer as described in claim 1, which is characterized in that it includes that module, which occurs, for the comb spectrum Two amplifiers and comb spectrum generator, second amplifier carry out drive amplification to the clock signal and input the pectination It composes in generator, the comb spectrum generator generates the multiple harmonic component of the clock signal.

3. broadband direct synthesizer as claimed in claim 2, which is characterized in that the broadband direct synthesizer is also Including a power splitter, one end of the power splitter is connect with the comb spectrum generator, the other end and first output channel And the second output channel connection.

4. broadband direct synthesizer as claimed in claim 3, which is characterized in that the switch filtering module includes two High speed high isolation switchs and a plurality of filtering channel in two high speed high isolations switches, in every filtering channel It is provided with one second bandpass filter, and the centre frequency of the second bandpass filter in every filtering channel is different.

5. broadband direct synthesizer as claimed in claim 4, which is characterized in that the frequency of the clock signal is 2GHz, the frequency range of the power splitter are 8GHz~22GHz.

6. broadband direct synthesizer as claimed in claim 5, which is characterized in that the filtering channel has 4,4 institutes The frequency range for stating filtering channel is respectively 16GHz ± 2GHz, 18GHz ± 2GHz, 20GHz ± 2GHz and 22GHz ± 2GHz.

7. broadband direct synthesizer as described in claim 1, which is characterized in that the letter of the first output channel output Number power be greater than or equal to 70dB.