CN212392875U - Direct frequency conversion receiver device with direct current offset correction - Google Patents
Direct frequency conversion receiver device with direct current offset correction Download PDFInfo
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- CN212392875U CN212392875U CN202021201566.8U CN202021201566U CN212392875U CN 212392875 U CN212392875 U CN 212392875U CN 202021201566 U CN202021201566 U CN 202021201566U CN 212392875 U CN212392875 U CN 212392875U
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Abstract
The utility model relates to a take direct frequency conversion receiver device that DC imbalance was rectified, including band-pass filter, low noise amplifier and the radio frequency transform module that connects gradually, the radio frequency transform module sets up two the tunnel, and each way includes local oscillator and the mixer, first low pass filter, 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, insert radio frequency signal and local oscillator signal respectively, the radio frequency transform module still include the DC imbalance correction circuit who passes through the negative feedback form with variable gain amplifier and be connected, compare with prior art, the utility model has the advantages of high reliability, low-power consumption, high integration and simple structure.
Description
Technical Field
The utility model belongs to the technical field of the wireless communication technique and specifically relates to a take direct frequency conversion receiver device that DC imbalance was rectified.
Background
With the improvement of wireless communication speed and the saturation of frequency spectrum resources, wireless communication technology develops towards the direction of high frequency band and large bandwidth, and higher requirements are also put forward on the existing radio frequency receiver, and the radio frequency receiver is required to have low power consumption, high integration degree, low cost, high reliability and the like. Under such a background, the direct conversion receiver gradually becomes the best choice for the radio frequency receiver due to its characteristics of simple structure, easy full integration, low power consumption, excellent performance, and the like.
The local oscillator signal of the direct radio frequency receiver has the same frequency as the radio frequency signal, the local oscillator signal accessed by the local oscillator end of the frequency mixer 4 and the radio frequency signal accessed by the radio frequency input end cannot realize ideal isolation, the local oscillator signal leaks to the low noise amplifier 3, and when the local oscillator signal is reflected back to the input end of the frequency mixer 4 from a leaked path, local oscillator self-mixing occurs, and direct current offset with zero difference frequency is generated. The interference signal with strong power will also feed through from the low noise amplifier 3 or the mixer 4 to the local oscillator end of the mixer 4, and generate a dc offset component after mixing. Device mismatches also produce dc offsets that are superimposed on and interfere with the baseband signal.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and provides a direct-conversion receiver device with dc offset correction, which can effectively eliminate the dc offset phenomenon.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a take direct frequency conversion receiver device of direct current maladjustment correction, 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, first low pass filter, 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, insert radio frequency signal and local oscillator signal respectively, the radio frequency conversion module still include the direct current maladjustment correction circuit who forms the negative feedback with variable gain amplifier is connected.
After being amplified by the band-pass filter 2 and the low-noise amplifier 3, a received radio frequency signal is mixed with two paths of local oscillation signals which are orthogonal to each other through the mixer 4 to generate an in-phase baseband signal and an orthogonal baseband signal respectively, because the frequency of the local oscillation signals is the same as that of the radio frequency signal, the baseband signals are directly generated after mixing, channel selection and gain adjustment are carried out on the baseband and are completed by the first low-pass filter 5 and the variable gain amplifier 6, and a direct current offset correction circuit 9 connected with the variable gain amplifier 6 in a voltage negative feedback mode eliminates direct current offset voltage, so that the saturation of an analog baseband circuit caused by the overlarge direct current offset voltage is prevented.
Furthermore, the direct current offset correction circuit is connected with the variable gain amplifier to form voltage negative feedback.
Furthermore, the dc offset correction circuit adopts a DCOC circuit, and includes a second low-pass filter, a transconductance unit, and a correction resistor, which are connected in sequence, wherein the second low-pass filter is connected to an output terminal of the variable gain amplifier, and the correction resistor is connected to an input terminal of the variable gain amplifier.
The cut-off frequency of the second low-pass filter is 100KHz, the direct current offset voltage is taken out by the second low-pass filter, the transconductance unit converts the taken-out direct current offset voltage into a current signal, and the current signal flows through the correcting resistor to generate a voltage opposite to the direct current offset voltage at the input end of the variable gain amplifier, so that the direct current offset voltage is eliminated.
The device also comprises a DSP processor, and 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.
The device also comprises an antenna, and the input end of the band-pass filter is connected with the antenna.
The mixer can adopt TRF37B 32; the variable gain amplifier can adopt VCA 821; the analog-to-digital converter can adopt ADS54J 42; the DSP processor can adopt TMS320VC 5506; the antenna can adopt a ceramic antenna, and the transconductance unit can adopt a transconductance operational amplifier.
Compared with the prior art, the utility model has the advantages of it is following:
1) high reliability: the utility model adds a direct current offset correction circuit (DCOC circuit), which can effectively eliminate direct current offset and prevent the saturation of the analog baseband circuit caused by the overlarge direct current offset voltage;
2) low power consumption: the utility model does not need an image rejection filter, thus reducing the power consumption;
3) high integration level: the utility model does not need a mirror image rejection filter, and increases the integration level;
4) the structure is simple: the utility model discloses do not need the mirror image rejection filter, reduced the filtering requirement, can adopt low order low pass filter, the cost is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a connection diagram of the dc offset calibration circuit.
Wherein: 1. the antenna comprises an antenna, 2, a band-pass filter, 3, a low-noise amplifier, 4, a mixer, 5, a first low-pass filter, 6, a variable gain amplifier, 7, an analog-to-digital converter, 8, a DSP processor, 9, a direct current offset correction circuit, 91, a second low-pass filter, 92, a transconductance unit, 93 and a correction resistor.
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 present invention provides a direct frequency conversion receiver device with dc offset correction, which comprises a band pass filter 2, a low noise amplifier 3 and a radio frequency conversion module connected in sequence, wherein the radio frequency conversion module is provided with two paths, each path comprises a local oscillator, a dc offset correction circuit 9, a mixer 4, a first low pass filter 5, a variable gain amplifier 6 and an analog-to-digital converter 7 connected in sequence, the input end of the mixer 4 is connected with the low noise amplifier 3 and the corresponding local oscillator, the dc offset correction circuit 9 is connected with the variable gain amplifier 6 to form a voltage negative feedback, the dc offset correction circuit 9 is a DCOC circuit, which comprises a second low pass filter 91, a transconductance unit 92 and a correction resistor 93 connected in sequence, the second low pass filter 91 is connected with the output end of the variable gain amplifier 6, the correction resistor 93 is connected to the input terminal of the variable gain amplifier 6.
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, and the input end of a band-pass filter 2 is connected with the antenna 1.
The direct conversion receiver has no problem of image signal interference, because the image signal is the signal itself, compared with the superheterodyne receiver, the direct conversion receiver omits an image rejection filter with high quality factor, and in the aspect of channel selectivity, after frequency mixing, only one low-pass filter is needed to filter out signals except for a required channel, but the main problem is that the direct conversion receiver faces local oscillator leakage and direct current offset brought by the local oscillator leakage.
The utility model discloses increased direct current Offset correction circuit 9(DCOC circuit) on traditional direct frequency conversion receiver basis, can effectively eliminated direct current Offset (DC Offset), direct current Offset voltage is taken out by second low pass filter 91, and transconductance unit 92 converts the direct current Offset voltage who takes out into current signal, and current signal flows through correcting resistor 93 and produces the voltage opposite with direct current Offset voltage at variable gain amplifier 6's input to eliminate direct current Offset voltage.
The utility model discloses take direct frequency conversion receiver device of direct current imbalance correction's theory of operation as follows:
after a radio frequency signal received by an antenna 1 is amplified by a band-pass filter 2 and a low-noise amplifier 3, the radio frequency signal is mixed with two paths of local oscillation signals which are orthogonal to each other by a mixer 4 to generate an in-phase baseband signal and an orthogonal baseband signal respectively, because the frequency of the local oscillation signals is the same as that of the radio frequency signal, the baseband signal is directly generated after mixing, channel selection and gain adjustment are carried out on a baseband and are completed by a first low-pass filter 5 and a variable gain amplifier 6, and a direct current offset correction circuit 9 connected with the variable gain amplifier 6 in a voltage negative feedback mode eliminates direct current offset voltage, so that the saturation of an analog baseband circuit caused by the overlarge direct current offset voltage is prevented.
Specifically, in this embodiment, the mixer 4 selects the TRF37B32, the variable gain amplifier 6 selects the VCA821, the first low-pass filter 5 selects a filter with a cutoff frequency of 2MHz, which may be any type, the analog-to-digital converter 7 selects the ADS54J42, the DSP processor 8 selects the TMS320VC5506, the antenna 1 selects a ceramic antenna, the transconductance unit 92 selects a transconductance operational amplifier, and the second low-pass filter 91 selects a filter with a cutoff frequency of 100 KHz.
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 take direct frequency conversion receiver device of direct current offset correction, 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), first low pass filter (5), 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 radio frequency conversion module still include and be connected direct current offset correction circuit (9) that form the negative feedback with variable gain amplifier (6).
2. The direct-conversion receiver apparatus with dc offset correction according to claim 1, wherein the dc offset correction circuit (9) is connected to the variable gain amplifier (6) to form a voltage negative feedback.
3. The direct-conversion receiver apparatus with dc offset correction according to claim 2, wherein the dc offset correction circuit (9) is a DCOC circuit, and comprises a second low-pass filter (91), a transconductance unit (92) and a correction resistor (93) connected in sequence, the second low-pass filter (91) is connected to the output terminal of the variable gain amplifier (6), and the correction resistor (93) is connected to the input terminal of the variable gain amplifier (6).
4. A dcr apparatus with dc offset correction according to any of claims 1-3, characterized in that the apparatus further comprises a DSP processor (8), and the output terminals of the analog-to-digital converters (7) in the two rf conversion modules are respectively connected to the DSP processor (8).
5. A direct conversion receiver arrangement with dc offset correction 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. The direct conversion receiver apparatus with dc offset correction according to claim 1, characterized in that said mixer (4) is of the type TRF37B 32.
7. The direct-conversion receiver apparatus with dc offset correction according to claim 1, characterized in that the variable gain amplifier (6) is of the type VCA 821.
8. The dcr apparatus with dc offset correction according to claim 1, characterized in that the analog-to-digital converter (7) is of the type ADS54J 42.
9. The dcr apparatus with dc offset correction as claimed in claim 4, wherein said DSP processor (8) is of the type TMS320VC 5506.
10. The direct-conversion receiver arrangement with dc offset correction according to claim 5, characterized in that the antenna (1) is a ceramic antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021201566.8U CN212392875U (en) | 2020-06-27 | 2020-06-27 | Direct frequency conversion receiver device with direct current offset correction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021201566.8U CN212392875U (en) | 2020-06-27 | 2020-06-27 | Direct frequency conversion receiver device with direct current offset correction |
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| CN212392875U true CN212392875U (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021201566.8U Active CN212392875U (en) | 2020-06-27 | 2020-06-27 | Direct frequency conversion receiver device with direct current offset correction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162707A (en) * | 2021-06-24 | 2021-07-23 | 成都旋极星源信息技术有限公司 | Intermediate frequency direct current offset calibration DCOC circuit applied to radio frequency signal receiver |
| CN114978214A (en) * | 2022-05-23 | 2022-08-30 | Oppo广东移动通信有限公司 | Direct conversion receiver, data receiving method, storage medium, and electronic device |
-
2020
- 2020-06-27 CN CN202021201566.8U patent/CN212392875U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162707A (en) * | 2021-06-24 | 2021-07-23 | 成都旋极星源信息技术有限公司 | Intermediate frequency direct current offset calibration DCOC circuit applied to radio frequency signal receiver |
| CN114978214A (en) * | 2022-05-23 | 2022-08-30 | Oppo广东移动通信有限公司 | Direct conversion receiver, data receiving method, storage medium, and electronic device |
| CN114978214B (en) * | 2022-05-23 | 2023-11-21 | Oppo广东移动通信有限公司 | Direct conversion receiver, data receiving method, storage medium and electronic device |
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Effective date of registration: 20230621 Address after: No. 289 Jiugan Road, Sijing Town, Songjiang District, Shanghai, 20101 Patentee after: SHANGHAI KEHAI HUATAI SHIP ELECTRIC CO.,LTD. Address before: 201620 No. 333, Longteng Road, Shanghai, Songjiang District Patentee before: SHANGHAI University OF ENGINEERING SCIENCE |
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| TR01 | Transfer of patent right |