CN209627358U - A kind of Direct Conversion Receiver device of AC coupled - Google Patents
A kind of Direct Conversion Receiver device of AC coupled Download PDFInfo
- Publication number
- CN209627358U CN209627358U CN201920470769.8U CN201920470769U CN209627358U CN 209627358 U CN209627358 U CN 209627358U CN 201920470769 U CN201920470769 U CN 201920470769U CN 209627358 U CN209627358 U CN 209627358U
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- China
- Prior art keywords
- conversion receiver
- direct conversion
- receiver device
- low
- mould group
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Abstract
The utility model relates to a kind of Direct Conversion Receiver devices of AC coupled, including radio frequency band filter, low-noise amplifier and rf conversion mould group, rf conversion mould group is equipped with two-way altogether, and rf conversion mould group includes sequentially connected local oscillator, low-pass filter, variable gain amplifier and analog-digital converter, the input terminal of local oscillator is connected to low-noise amplifier.Compared with prior art, the utility model is configured with two local oscillators, and an ac coupling capacitor is increased on the basis of conventional direct-conversion receiver, and cutoff frequency 5KHz eliminates DC maladjustment.
Description
Technical field
The utility model relates to a kind of receiver apparatus, fill more particularly, to a kind of Direct Conversion Receiver of AC coupled
It sets.
Background technique
Recently as the rapid development of wireless communication technique, wireless communication system product is more more and more universal, becomes current
The important component of human information social development.Radio-frequency transmitter is located at the front end of wireless communication system, structure and property
Entire communication system can be directly affected.Optimization design structure and the suitable manufacturing process of selection, to improve the performance valence of system
Lattice ratio is the direction that Radio Frequency Engineer is pursued.Since direct frequency receiver has small in size, at low cost and is easy to single chip integrated
Feature, it has also become a kind of structure of great competitiveness in radio-frequency transmitter is widely paid close attention in the field of wireless communication.But
Its existing main problem is DC maladjustment.
Utility model content
The purpose of this utility model is exactly to overcome the problems of the above-mentioned prior art and providing one kind can support
The Direct Conversion Receiver device of AC coupled.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of Direct Conversion Receiver device of AC coupled, including radio frequency band filter, low-noise amplifier and penetrate
Frequency transformation mould group, the rf conversion mould group is equipped with two-way altogether, and the rf conversion mould group includes local oscillator, Yi Jiyi
Frequency mixer, low-pass filter, variable gain amplifier and the analog-digital converter of secondary connection, the input terminal of the frequency mixer connect respectively
It is connected to low-noise amplifier and corresponding local oscillator.
Described device further includes dsp processor, and the output end of two analog-digital converters is connected to dsp processor.
Described device further includes antenna, and the input terminal of the radio frequency band filter is connected to the antenna.
Compared with prior art, the utility model has the following beneficial effects:
1) two local oscillators are configured with, an AC coupled electricity is increased on the basis of conventional direct-conversion receiver
Hold, cutoff frequency 5KHz eliminates DC maladjustment (DC Offset).
2) low-power consumption: being not required to image-reject filter, reduces power consumption.
3) high integration: being not required to image-reject filter, increases integrated level.
4) structure is simple: being not required to image-reject filter, reduces filtering requirements, low-order low-pass can be used.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Wherein: 1, radio frequency band filter, 2, low-noise amplifier, 3, local oscillator, 4, low-pass filter, 5, variable
Gain amplifier, 6, analog-digital converter, 7, dsp processor, 8, antenna, 9, ac coupling capacitor.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.The present embodiment is with the utility model
Implemented premised on technical solution, the detailed implementation method and specific operation process are given, but the guarantor of the utility model
Shield range is not limited to the following embodiments.
A kind of Direct Conversion Receiver device of AC coupled, as shown in Figure 1, including radio frequency band filter 1, low noise
Amplifier 2 and rf conversion mould group, rf conversion mould group is equipped with two-way altogether, and rf conversion mould group includes local oscillator, with
And sequentially connected frequency mixer 3, ac coupling capacitor 9, low-pass filter 4, variable gain amplifier 5 and analog-digital converter 6, it mixes
The input terminal of frequency device 3 is respectively connected to low-noise amplifier 2 and corresponding local oscillator.
Device further includes dsp processor 7, and the output end of two analog-digital converters 6 is connected to dsp processor 7.
Device further includes antenna 8, and the input terminal of radio frequency band filter 1 is connected to antenna 8.
Local frequency is allowed to be equal to carrier frequency, that is, taking intermediate frequency is zero, and image frequency is just not present, and also there will be no mirror image frequencies
Rate interference, here it is directly lower mixing, are also zero intermediate frequency.Zero intermediate frequency reciver is directly by radiofrequency signal from rf conversion to base
Band.It is DC maladjustment that zero intermediate frequency, which receives existing main problem,.Since local oscillator is identical as the carrier frequency of signal is received, at this
In the case where ideal cannot being isolated between vibration and the rf inputs mouth of frequency mixer, local oscillation signal is caused to leak into low noise amplification
The input terminal of device and frequency mixer forms DC maladjustment by self-mixing.These direct current signals will be superimposed upon in baseband signal, and right
Baseband signal constitutes interference.In order to eliminate DC maladjustment, an AC-coupling capacitors, isolated DC component, cut-off are increased
Frequency is 5KHz.Other problems arise for zero intermediate frequency reception, such as under frequency mixer itself symmetry degenerate case, efficient channel
Nearby existing two strong interferences may be aliased into base band in lower optical mixing process causes even order to be distorted, and I, Q two orthogonal
The frequency mixer mismatch in channel causes the interference etc. to baseband portion, and these problems can be eliminated by the digital processing of base band.
Compared with superhet, low intermediate frequency receiver, the most attractive place of zero intermediate frequency reciver is in lower optical mixing process not
Intermediate frequency need to be passed through, and image frequency is radiofrequency signal itself, there is no image frequencies to interfere, image-reject filter and intermediate frequency
Filter can omit.Outer member is on the one hand eliminated in this way, is conducive to the single-chip integration of system, is reduced cost.Another party
Circuit module needed for plane system and outside segments points are reduced, and power consumption needed for reducing receiver simultaneously reduces radiofrequency signal by outer
The chance of portion's interference.The structure is rapidly developed in recent years, becomes one of main selection of monolithic integrated receiver.Due to zero
Intermediate-frequency receiver does not need the outer high q-factor bandpass filter of piece, and single-chip integration may be implemented, and is widely paid attention to.
In addition, using the TRF37B32 of 0.7-2.7GHz, low-pass filter 4 can use appoints frequency mixer 3 in the present embodiment
The filter of the cutoff frequency 2MHz for model of anticipating, VCA821 of the variable gain amplifier 5 using gain ranging 40dB, analog-to-digital conversion
Device 6 is using 14 ADS54J42, and dsp processor 7 is using TMS320VC5506.
Claims (8)
1. a kind of Direct Conversion Receiver device of AC coupled, including radio frequency band filter (1), low-noise amplifier (2)
With rf conversion mould group, which is characterized in that the rf conversion mould group is equipped with two-way altogether, and the rf conversion mould group includes this
Ground oscillator and sequentially connected frequency mixer (3), ac coupling capacitor (9), low-pass filter (4), variable gain amplifier
(5) and analog-digital converter (6), the input terminal of the frequency mixer (3) are respectively connected to low-noise amplifier (2) and corresponding local vibration
Swing device.
2. a kind of Direct Conversion Receiver device of AC coupled according to claim 1, which is characterized in that described device
It further include dsp processor (7), the output end of two analog-digital converters (6) is connected to dsp processor (7).
3. a kind of Direct Conversion Receiver device of AC coupled according to claim 1, which is characterized in that described device
It further include antenna (8), the input terminal of the radio frequency band filter (1) is connected to the antenna (8).
4. a kind of Direct Conversion Receiver device of AC coupled according to claim 1, which is characterized in that the mixing
Device (3) uses TRF37B32.
5. a kind of Direct Conversion Receiver device of AC coupled according to claim 1, which is characterized in that described variable
Gain amplifier (5) uses VCA821.
6. a kind of Direct Conversion Receiver device of AC coupled according to claim 1, which is characterized in that the modulus
Converter (6) uses ADS54J42.
7. a kind of Direct Conversion Receiver device of AC coupled according to claim 2, which is characterized in that the DSP
Processor (7) uses TMS320VC5506.
8. a kind of Direct Conversion Receiver device of AC coupled according to claim 3, which is characterized in that the antenna
It (8) is ceramic antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470769.8U CN209627358U (en) | 2019-04-09 | 2019-04-09 | A kind of Direct Conversion Receiver device of AC coupled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470769.8U CN209627358U (en) | 2019-04-09 | 2019-04-09 | A kind of Direct Conversion Receiver device of AC coupled |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209627358U true CN209627358U (en) | 2019-11-12 |
Family
ID=68458429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920470769.8U Expired - Fee Related CN209627358U (en) | 2019-04-09 | 2019-04-09 | A kind of Direct Conversion Receiver device of AC coupled |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209627358U (en) |
-
2019
- 2019-04-09 CN CN201920470769.8U patent/CN209627358U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191112 |