CN107819440A - A kind of mixting circuit - Google Patents
A kind of mixting circuit Download PDFInfo
- Publication number
- CN107819440A CN107819440A CN201711299376.7A CN201711299376A CN107819440A CN 107819440 A CN107819440 A CN 107819440A CN 201711299376 A CN201711299376 A CN 201711299376A CN 107819440 A CN107819440 A CN 107819440A
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- Prior art keywords
- signals
- circuit
- attenuator
- low pass
- filtering
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Links
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The present invention relates to electronic measuring instrument field, more particularly to a kind of mixting circuit.Including intermediate-freuqncy signal source, for producing 21.4MHz intermediate-freuqncy signals；The intermediate-freuqncy signal source is connected by the first low pass filter with an input of the first frequency mixer；Another input of first frequency mixer receives 149.6MHz signals, and the 149.6MHz signals export 171MHz signals to RF switch after passing sequentially through the first filtering and amplifying circuit, the second filtering and amplifying circuit after the mixing of the first frequency mixer with 21.4MHz signals；The RF switch receives at least two-way 171MHz signals, meanwhile, the output end of the RF switch is connected with the first attenuator, and first attenuator is by the 3rd low pass filter by signal output；Mixting circuit provided by the invention, work are more stable.
Description
Technical field
The present invention relates to electronic measuring instrument field, more particularly to a kind of mixting circuit.
Background technology
In radiofrequency signal field, electronic gauge is essential tester, and the signal source in electronic gauge
The even more core devices of electronic gauge, it is mainly responsible for producing with specific frequency, the radio signal of amplitude, if letter
If number source is the core devices of electronic gauge, then mixting circuit is exactly the core circuit of signal source, the spy of mixting circuit
Property directly determines that can signal source produce qualified signal.
The content of the invention
It is an object of the invention to the technical need of stable mixting circuit is needed in face of good signal source, there is provided Yi Zhongyong
In the mixting circuit of electronic gauge signal source.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of mixting circuit, including,
Intermediate-freuqncy signal source, for producing 21.4MHz intermediate-freuqncy signals；
The intermediate-freuqncy signal source is connected by the first low pass filter with an input of the first frequency mixer；
Another input of first frequency mixer receives 149.6MHz signals, the 149.6MHz signals and 21.4MHz signals
171MHz signals are exported after the first filtering and amplifying circuit, the second filtering and amplifying circuit are passed sequentially through after the mixing of the first frequency mixer extremely
RF switch；
The RF switch receives at least two-way 171MHz signals, meanwhile, the output end of the RF switch and the first attenuator
Connection, for first attenuator by the 3rd low pass filter by signal output, the attenuator is voltage adjustable attenuator.
Further, first filtering and amplifying circuit include be sequentially connected the first filter circuit, the first amplifier and
First low pass filter.
Further, first filter circuit is formed for three resistance of π type structures.
Further, second filtering and amplifying circuit includes the second amplifier and the second LPF being sequentially connected
Device.
Compared with prior art, beneficial effects of the present invention：The present invention provides a kind of for electronic gauge signal source
Mixting circuit, by specific signal processing flow, and applied voltage adjustable attenuator so that circuit work is more stable, together
When export target zone in radiofrequency signal.
Brief description of the drawings：
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is connected circuit diagram for intermediate-freuqncy signal source, the first low pass filter in the present invention with the first frequency mixer.
Fig. 3 a are the first filtering and amplifying circuit circuit diagram in the present invention.
Fig. 3 b are the second filtering and amplifying circuit circuit diagram in the present invention.
Fig. 4 is radio-frequency switch circuit figure in the present invention.
Fig. 5 is attenuator circuit figure in the present invention.
Fig. 6 is Post Mixer schematic block circuit diagram in embodiment.
Fig. 7 is the first frequency mixer, the first filter circuit, band pass filter circuit connection in Post Mixer circuit in embodiment
Figure.
Fig. 8 is the second low pass filter, amplifier, the second filter circuit connection figure in Post Mixer circuit in embodiment.
Fig. 9 is the 3rd low pass filter, digital step attenuator circuit connection diagram in Post Mixer circuit in embodiment.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.But this should not be interpreted as to this
The scope for inventing above-mentioned theme is only limitted to following embodiment, all to belong to the present invention based on the technology that present invention is realized
Scope.
Embodiment 1：As shown in Figures 1 to 5, the present embodiment provides a kind of mixting circuit, including, for producing 21.4MHz
The intermediate-freuqncy signal source 1 of intermediate-freuqncy signal；Intermediate-freuqncy signal source 1 passes through the first low pass filter 2 and an input of the first frequency mixer 3
Connection.
Another input of first frequency mixer 3 receives 149.6MHz signals, the 149.6MHz signals and 21.4MHz signals
171MHz letters are exported after the first filtering and amplifying circuit 4, the second filtering and amplifying circuit 5 are passed sequentially through after the mixing of the first frequency mixer 3
Number to RF switch 6；In the present embodiment, the first filtering and amplifying circuit 4 includes the first filter circuit, the first amplification being sequentially connected
Device and the first low pass filter；First filter circuit is formed for three resistance R18, R19, R20 of π type structures；This implementation
In example, the second filtering and amplifying circuit 5 includes the second amplifier and the second low pass filter being sequentially connected.
The RF switch 6 receives at least two-way 171MHz signals, meanwhile, the output end and first of the RF switch 6
Attenuator 7 is connected, and first attenuator 7 is declined signal output, the attenuator for voltage is adjustable by the 3rd low pass filter
Subtract device, the attenuator is HSMP-3814.As shown in figure 5, the path amplitude in this circuit mainly adjusts 7 numbers of decaying by first
Word is decayed, end 20dBm gains control.Cal_amp is that the maximum voltage of control electricity tune decay is about 3.2V or so now electric
Adjust attenuation minimum, voltage reduces decay increase, and decaying when cal_amp voltage 0.8V is close to 20dBm, finally output letter
Number signal 2st Mixer.
The signal 2st Mixer of the present embodiment output are finally by Post Mixer circuit as shown in Figures 6 to 9
Reason, the Post Mixer circuit include, the second frequency mixer 21, and second frequency mixer 21 is used for the two paths of signals 2st that will be received
Mixer and 1520MHz signals export after being mixed；In the present embodiment, the second frequency mixer 21 uses RMS-30；First mixing
The output end of device 21 passes sequentially through the first filter circuit 22, bandpass filter 23, the second low pass filter 24, amplifier 25,
Three low pass filters 27 are exported to digital step attenuator 28, and export 1691BPF；The output end of the amplifier 25 is led to simultaneously
The second filter circuit 26 is crossed to be connected with+5Vam power supplys；In a particular embodiment, the first filter circuit 22 for π type structures R21,
Tri- resistance of R24, R25 are formed；It carries out adjustable attenuation using signal ATT3 as control signal to rf wave.
Claims (4)
- A kind of 1. mixting circuit, it is characterised in that including,Intermediate-freuqncy signal source, for producing 21.4MHz intermediate-freuqncy signals；The intermediate-freuqncy signal source is connected by the first low pass filter with an input of the first frequency mixer；Another input of first frequency mixer receives 149.6MHz signals, the 149.6MHz signals and 21.4MHz signals 171MHz signals are exported after the first filtering and amplifying circuit, the second filtering and amplifying circuit are passed sequentially through after the mixing of the first frequency mixer extremely RF switch；The RF switch receives at least two-way 171MHz signals, meanwhile, the output end of the RF switch and the first attenuator Connection, first attenuator is by the 3rd low pass filter by signal output；The attenuator is voltage adjustable attenuator.
- 2. circuit as claimed in claim 1, it is characterised in that first filtering and amplifying circuit includes first be sequentially connected Filter circuit, the first amplifier and the first low pass filter.
- 3. circuit as claimed in claim 1, it is characterised in that first filter circuit is three resistance structures of π type structures Into.
- 4. circuit as claimed in claim 1, it is characterised in that second filtering and amplifying circuit includes second be sequentially connected Amplifier and the second low pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299376.7A CN107819440A (en) | 2017-12-08 | 2017-12-08 | A kind of mixting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299376.7A CN107819440A (en) | 2017-12-08 | 2017-12-08 | A kind of mixting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107819440A true CN107819440A (en) | 2018-03-20 |
Family
ID=61605879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711299376.7A Pending CN107819440A (en) | 2017-12-08 | 2017-12-08 | A kind of mixting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107819440A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4340975A (en) * | 1979-10-09 | 1982-07-20 | Matsushita Electric Industrial Company, Limited | Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit |
| KR19980039203A (en) * | 1996-11-27 | 1998-08-17 | 정장호 | Frequency Down Conversion Circuit of Mobile Communication System Base Station by Code Division Multiple Access |
| KR19980048832A (en) * | 1996-12-18 | 1998-09-15 | 유기범 | Intermediate frequency signal receiver of satellite communication system |
| US20100291875A1 (en) * | 2006-10-13 | 2010-11-18 | Thales | Radioelectric transmission and reception module mainly intended for broad-band radiocommunications |
| CN102004242A (en) * | 2010-09-30 | 2011-04-06 | 中国船舶重工集团公司第七二三研究所 | Low-stray low-harmonic and high-dynamic signal generation method |
| CN207475490U (en) * | 2017-12-08 | 2018-06-08 | 成都前锋电子仪器有限责任公司 | A kind of mixting circuit |
-
2017
- 2017-12-08 CN CN201711299376.7A patent/CN107819440A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4340975A (en) * | 1979-10-09 | 1982-07-20 | Matsushita Electric Industrial Company, Limited | Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit |
| KR19980039203A (en) * | 1996-11-27 | 1998-08-17 | 정장호 | Frequency Down Conversion Circuit of Mobile Communication System Base Station by Code Division Multiple Access |
| KR19980048832A (en) * | 1996-12-18 | 1998-09-15 | 유기범 | Intermediate frequency signal receiver of satellite communication system |
| US20100291875A1 (en) * | 2006-10-13 | 2010-11-18 | Thales | Radioelectric transmission and reception module mainly intended for broad-band radiocommunications |
| CN102004242A (en) * | 2010-09-30 | 2011-04-06 | 中国船舶重工集团公司第七二三研究所 | Low-stray low-harmonic and high-dynamic signal generation method |
| CN207475490U (en) * | 2017-12-08 | 2018-06-08 | 成都前锋电子仪器有限责任公司 | A kind of mixting circuit |
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