CN203708228U - Down frequency converter circuit - Google Patents
Down frequency converter circuit Download PDFInfo
- Publication number
- CN203708228U CN203708228U CN201320889351.3U CN201320889351U CN203708228U CN 203708228 U CN203708228 U CN 203708228U CN 201320889351 U CN201320889351 U CN 201320889351U CN 203708228 U CN203708228 U CN 203708228U
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- Prior art keywords
- frequency
- output
- local oscillator
- converter circuit
- pass filter
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- 230000010355 oscillation Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Superheterodyne Receivers (AREA)
Abstract
A down frequency converter circuit is disclosed and relates to a frequency converter. The down frequency converter circuit comprises a low noise amplifier, a frequency mixer, a local oscillator drive amplifier and a low pass filter, wherein a radiofrequency signal is output to an input end of the low noise amplifier, an output end of the low noise amplifier is connected with a first input end of the frequency mixer, a local oscillator signal is output to an input end of the local oscillator drive amplifier, an output end of the local oscillator drive amplifier is connected with a second input end of the frequency mixer, an output end of the frequency mixer is connected with an input end of the low pass filter, and an intermediate frequency signal is output by the low pass filter. The down frequency converter circuit disclosed in the utility model is characterized by effective improvement of isolation between a radio frequency and an intermediate frequency, and wide application to various radio frequency and microwave communication receiving devices and signal emitting devices.
Description
Technical field
The utility model relates to frequency converter, particularly a kind of down-converter circuit.
Background technology
Since 19th-century maxwell Theory of Electromagnetic Field is set up, radiotechnics has been deep into the every field of Human routine activities.Radiotechnics is widely used at engineering fields such as the energy, traffic, medical treatment and information.
Electromagnetic wave is as the carrier of a kind of energy or information, and its most basic physical quantity is frequency and power.Extensive along with what apply, it is further important that frequency converter becomes in frequency and power application, is almost the critical component of all radio frequencies and microwave communication receiver and signal projector.The major function of low-converter be by signal from a higher frequency inverted to another lower frequency, and the power of signal is amplified, thereby makes the work of other functional circuits such as signal amplification, filtering, detection and transmission more effective.
But existing low-converter radio frequency is poor to the isolation of intermediate frequency, be difficult to meet the application demand of some certain applications.
Summary of the invention
In order to solve existing low-converter radio frequency to the poor technical problem of the isolation of intermediate frequency, the utility model proposes a kind of down-converter circuit, comprising: low noise amplifier, frequency mixer, local oscillator driving amplifier and low pass filter; Radiofrequency signal exports the input of low noise amplifier to, the output of low noise amplifier is connected with the first input end of frequency mixer, local oscillation signal exports the input of local oscillator driving amplifier to, the output of local oscillator driving amplifier is connected with the second input of frequency mixer, the output of frequency mixer is connected with the input of low pass filter, low pass filter output intermediate-freuqncy signal.
Down-converter circuit of the present utility model, has effectively promoted the isolation of radio frequency to intermediate frequency, is widely used in various radio frequencies and microwave communication receiver and signal projector.
Brief description of the drawings
Fig. 1 is the electrical block diagram of a kind of down-converter circuit of the present utility model.
Embodiment
Describe down-converter circuit of the present utility model in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model proposes a kind of down-converter circuit, comprising: low noise amplifier, frequency mixer, local oscillator driving amplifier and low pass filter; Radiofrequency signal exports the input of low noise amplifier to, the output of low noise amplifier is connected with the first input end of frequency mixer, local oscillation signal exports the input of local oscillator driving amplifier to, the output of local oscillator driving amplifier is connected with the second input of frequency mixer, the output of frequency mixer is connected with the input of low pass filter, low pass filter output intermediate-freuqncy signal.
Described low pass filter can be selected oval filtering low pass filter.
In order to reduce port standing wave, can increase T-shaped resistance decrement network at the input of local oscillator driving amplifier, local oscillation signal exports the input (be the input that local oscillation signal exports T-shaped resistance decrement network to, the output of T-shaped resistance decrement network is connected with the input of local oscillator driving amplifier) of local oscillator driving amplifier to by T-shaped resistance decrement network.
Test result shows, the radio frequency of common down-converter circuit to the isolation of intermediate frequency is >=10dB, and the radio frequency of down-converter circuit of the present utility model to the isolation of intermediate frequency is >=20dB.
Claims (3)
1. a down-converter circuit, is characterized in that, comprising: low noise amplifier, frequency mixer, local oscillator driving amplifier and low pass filter; Radiofrequency signal exports the input of low noise amplifier to, the output of low noise amplifier is connected with the first input end of frequency mixer, local oscillation signal exports the input of local oscillator driving amplifier to, the output of local oscillator driving amplifier is connected with the second input of frequency mixer, the output of frequency mixer is connected with the input of low pass filter, low pass filter output intermediate-freuqncy signal.
2. a kind of down-converter circuit as claimed in claim 1, is characterized in that, described low pass filter is oval filtering low pass filter.
3. a kind of down-converter circuit as described in claim 1 to 2 any one, is characterized in that, also comprises T-shaped resistance decrement network, and described local oscillation signal exports the input of described local oscillator driving amplifier to by described T-shaped resistance decrement network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320889351.3U CN203708228U (en) | 2013-12-31 | 2013-12-31 | Down frequency converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320889351.3U CN203708228U (en) | 2013-12-31 | 2013-12-31 | Down frequency converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203708228U true CN203708228U (en) | 2014-07-09 |
Family
ID=51058605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320889351.3U Expired - Lifetime CN203708228U (en) | 2013-12-31 | 2013-12-31 | Down frequency converter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203708228U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088602A (en) * | 2018-08-10 | 2018-12-25 | 成都众景天成科技有限公司 | A kind of millimeter wave broadband low-converter |
| CN112511107A (en) * | 2020-01-15 | 2021-03-16 | 西安讯昂信息技术有限公司 | Time-frequency domain composite frequency converter |
-
2013
- 2013-12-31 CN CN201320889351.3U patent/CN203708228U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088602A (en) * | 2018-08-10 | 2018-12-25 | 成都众景天成科技有限公司 | A kind of millimeter wave broadband low-converter |
| CN112511107A (en) * | 2020-01-15 | 2021-03-16 | 西安讯昂信息技术有限公司 | Time-frequency domain composite frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |