CN212392874U - Low-intermediate frequency receiver device - Google Patents
Low-intermediate frequency receiver device Download PDFInfo
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- CN212392874U CN212392874U CN202021400403.2U CN202021400403U CN212392874U CN 212392874 U CN212392874 U CN 212392874U CN 202021400403 U CN202021400403 U CN 202021400403U CN 212392874 U CN212392874 U CN 212392874U
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Abstract
The utility model relates to a low intermediate frequency receiver device, including band pass filter, low noise amplifier and the radio frequency conversion module that connects gradually, the radio frequency conversion module sets up two the tunnel, and each way includes local oscillator and the mixer, variable gain amplifier and the analog-to-digital converter that connect gradually respectively, the input of mixer be connected with low noise amplifier and corresponding local oscillator respectively, its characterized in that, the device still include complex band pass filter, complex band pass filter set up between mixer and variable gain amplifier. The output of two way mixers be connected with complex band pass filter respectively, the input of two way variable gain amplifiers be connected with complex band pass filter respectively, compare with prior art, the utility model has the advantages of effectively restrain image interference and integrated level height, the consumption is little, with low costs.
Description
Technical Field
The utility model belongs to the technical field of the wireless communication technique and specifically relates to a low intermediate frequency receiver device is related to.
Background
The wireless communication technology has wide application in various fields such as industrial control, medical treatment, traffic, electronic payment and the like. The receiver performance in the terminal directly determines the quality of the received signal. Miniaturization and low power consumption are the development of wireless communication technology, which requires that the receiver must be developed for low cost, high integration and low power consumption.
The receiver employs a single chip design to reduce power consumption and cost. Of which the zero-if and low-if architectures are two of the more popular rf receiver architectures. The zero if receiver is limited in performance by the influence of dc loss and flicker noise, and an additional circuit is required to eliminate the influence during circuit design, which undoubtedly increases the complexity and power consumption of the system. Low if receivers are not affected by these factors and are therefore widely used. However, the low intermediate frequency receiver has image interference, which needs to be suppressed.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide a low-if receiver apparatus capable of effectively suppressing image interference.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a low intermediate frequency receiver device, is including the band-pass filter, low noise amplifier and the radio frequency conversion module that connect gradually, the radio frequency conversion module sets up two the tunnel, and each way includes local oscillator and the mixer, variable gain amplifier and the analog-to-digital converter that connect gradually respectively, the input of mixer be connected with low noise amplifier and corresponding local oscillator respectively, its characterized in that, the device still includes complex band-pass filter, complex band-pass filter set up between mixer and variable gain amplifier. The output ends of the two paths of frequency mixers are respectively connected with the complex band-pass filters, and the input ends of the two paths of variable gain amplifiers are respectively connected with the complex band-pass filters.
The principle of the utility model is that:
the method comprises the steps that after a low-intermediate frequency receiver receives intermediate frequency signals, the intermediate frequency signals are amplified through a low-noise amplifier and directly enter two down-conversion frequency mixers driven by orthogonal local oscillator signals to carry out frequency conversion, two I/Q low-intermediate frequency signals are obtained, the intermediate frequency is very low and is only 1MHz or even about 100KHz, the intermediate frequency signals comprise useful signals and mirror image signals, the frequency of the mirror image signals is very close to that of the useful signals, a complex band-pass filter is needed to amplify the useful signals to suppress the mirror image signals after the intermediate frequency signals pass through the down-conversion frequency mixers, the complex band-pass filter receives the I path signals and the Q path signals at the same time, complex filtering is carried out by utilizing the phase characteristics of the signals, the positive frequency and the negative frequency are made to be asymmetrical by utilizing the phase of I, Q signals.
Furthermore, the circuit modules in the radio frequency conversion module are connected in an on-chip integration mode, so that the integration level is improved.
The device also comprises a DSP processor, wherein the output ends of the analog-to-digital converters in the two paths of radio frequency conversion modules are respectively connected with the DSP processor, and the DSP processor can work at a lower frequency.
The device also comprises an antenna, and the input end of the band-pass filter is connected with the antenna.
The mixer can adopt TRF37B32, the variable gain amplifier can adopt VCA821, the analog-to-digital converter can adopt ADS54J42, the DSP processor can adopt TMS320VC5506, the antenna can adopt a ceramic antenna, and the complex band-pass filter can adopt MAX275 low-pass filter to shift the amplitude-frequency characteristic to the central frequency for conversion.
Compared with the prior art, the utility model has the advantages of it is following:
1) image interference is effectively inhibited: the utility model discloses set up complex number band-pass filter behind the mixer and enlarge useful signal and restrain the mirror image signal, complex number filter can receive I way and Q way signal simultaneously, and utilize the phase characteristic of signal to carry out the complex number filtering, utilize the phase place of I, Q signal to make positive and negative frequency become asymmetric thereby realize enlarging useful signal and restrain the mirror image signal;
2) high integration level: the low-medium frequency receiver of the utility model adopts a multi-phase and complex signal mode, does not need a high-frequency image signal suppression filter, can be realized by adopting an on-chip integration mode, has simple structure, improves the integration level and reduces the cost;
2) low power consumption: the utility model can postpone the mirror image pressing which has to be carried out in the high frequency area originally to the low frequency area, greatly reduce the Q value requirement of the filter, avoid the adoption of passive devices such as capacitance and inductance corresponding to the radio frequency filter with high Q value and realize the integration on the chip, and reduce the area and the power consumption;
3) overcoming direct current imbalance: the utility model discloses the intermediate frequency point that low intermediate frequency receiver was selected is not the baseband, but a lower intermediate frequency point to the direct current imbalance and the influence of flicker noise to the receiver performance have been reduced greatly, the direct current imbalance problem has been overcome.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: 1. the device comprises an antenna, 2, a band-pass filter, 3, a low noise amplifier, 4, a mixer, 5, a complex band-pass filter, 6, a variable gain amplifier, 7, an analog-to-digital converter, 8 and a DSP processor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example (b):
as shown in fig. 1, the utility model provides a low intermediate frequency receiver device, including band pass filter 2, low noise amplifier 3 and the radio frequency conversion module that connects gradually, the radio frequency conversion module sets up two the tunnel, and each way includes local oscillator and the mixer 4, variable gain amplifier 6 and the analog to digital converter 7 that connect gradually respectively, and the input of mixer 4 is connected with low noise amplifier 3 and corresponding local oscillator respectively, and its characterized in that, the device still include complex band pass filter 5, and the output of two tunnel mixers 4 is connected with complex band pass filter 5 respectively, and the input of two tunnel variable gain amplifiers 6 is connected with complex band pass filter 5 respectively.
The device also comprises a DSP (digital signal processor) 8 and an antenna 1, wherein the output ends of analog-to-digital converters 7 in the two paths of radio frequency conversion modules are respectively connected with the DSP 8, the input end of a band-pass filter 2 is connected with the antenna 1, and circuit modules in the radio frequency conversion modules are connected in an on-chip integration mode.
The utility model discloses a low intermediate frequency receiver system need enlarge useful signal suppression mirror image signal through complex filter, and low intermediate frequency receiver does not need the off-chip filtering to be convenient for integrate, and the signal after the radio frequency signal down conversion is not the direct current moreover, avoids the influence of direct current imbalance and flicker noise, and intermediate frequency is low, and the complex band-pass filtering that realizes the intermediate frequency channel selection can be integrated on the chip.
In this embodiment, the complex band-pass filter 5 is formed by translating the amplitude-frequency characteristic to the central frequency by a MAX275 low-pass filter, the mixer 4 adopts TRF37B32, the variable gain amplifier 6 adopts VCA821, the analog-to-digital converter 7 adopts ADS54J42, the DSP processor 8 adopts TMS320VC5506, and the antenna 1 adopts a ceramic antenna.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a low intermediate frequency receiver device, is including band-pass filter (2), low noise amplifier (3) and the radio frequency conversion module that connects gradually, the radio frequency conversion module sets up two the tunnel, and each way includes local oscillator and mixer (4), variable gain amplifier (6) and analog-to-digital converter (7) that connect gradually respectively, the input of mixer (4) be connected with low noise amplifier (3) and corresponding local oscillator respectively, its characterized in that, the device still includes complex band-pass filter (5), the output of two the tunnel mixers (4) be connected with complex band-pass filter (5) respectively, the input of two the tunnel variable gain amplifier (6) be connected with complex band-pass filter (5) respectively.
2. A low if receiver apparatus according to claim 1, wherein the circuit modules in the rf conversion module are connected by on-chip integration.
3. A low if receiver apparatus according to claim 2, wherein said complex band-pass filter (5) is transformed by a MAX275 low-pass filter shifting the amplitude-frequency characteristic to the center frequency.
4. A low-if receiver apparatus according to any one of claims 1-3, further comprising a DSP processor (8), wherein the outputs of the analog-to-digital converters (7) in the two rf conversion modules are respectively connected to the DSP processor (8).
5. A low-if receiver arrangement according to any of claims 1-3, characterized in that the arrangement further comprises an antenna (1), and that the input of said band-pass filter (2) is connected to the antenna (1).
6. A low-if receiver arrangement according to claim 1, characterized in that said mixer (4) is of the type TRF37B 32.
7. A low if receiver apparatus according to claim 1, wherein said variable gain amplifier (6) is of the type VCA 821.
8. A low-if receiver arrangement according to claim 1, characterized in that the analog-to-digital converter (7) is of the type ADS54J 42.
9. A low IF receiver apparatus as claimed in claim 4, wherein the DSP processor (8) is of the type TMS320VC 5506.
10. A low-IF receiver apparatus as claimed in claim 5, wherein said antenna (1) is a ceramic antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021400403.2U CN212392874U (en) | 2020-07-15 | 2020-07-15 | Low-intermediate frequency receiver device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021400403.2U CN212392874U (en) | 2020-07-15 | 2020-07-15 | Low-intermediate frequency receiver device |
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| Publication Number | Publication Date |
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| CN212392874U true CN212392874U (en) | 2021-01-22 |
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| CN202021400403.2U Active CN212392874U (en) | 2020-07-15 | 2020-07-15 | Low-intermediate frequency receiver device |
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| CN (1) | CN212392874U (en) |
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- 2020-07-15 CN CN202021400403.2U patent/CN212392874U/en active Active
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Effective date of registration: 20230625 Address after: 2050 Jiangzhuang village, Caojing Town, Jinshan District, Shanghai, 201507 Patentee after: VALENCE BONDING TECHNOLOGY (SHANGHAI) CO.,LTD. Address before: 201620 No. 333, Longteng Road, Shanghai, Songjiang District Patentee before: SHANGHAI University OF ENGINEERING SCIENCE |