CN204967811U - Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof - Google Patents
Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof Download PDFInfo
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- CN204967811U CN204967811U CN201520737271.5U CN201520737271U CN204967811U CN 204967811 U CN204967811 U CN 204967811U CN 201520737271 U CN201520737271 U CN 201520737271U CN 204967811 U CN204967811 U CN 204967811U
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Abstract
The utility model provides a correcting unit is revealed to the local oscillator, its characterized in that: detection module, calibration algorithm control module, transmission IQ signal direct current adjustment module, route select switch, test signal production module, feedback switch and memory cell are revealed to the transmission local oscillator, the output that detection module connects the receive channel of radio frequency transceiving machine is revealed to the transmission local oscillator to detect the size that the local oscillator was revealed, calibration algorithm control module has the connection detection module's an input is revealed to the transmission local oscillator, and connects a plurality of output of transmission IQ signal direct current adjustment module, route select switch, feedback switch to regulate and control these a little modules. The utility model discloses still provide to use the device's digital interface radio frequency transceiving machine, utilize the resource of digital interface radio frequency transceiving machine itself to reveal the correction scheme for the digital local oscillator that it provided reliable and simple, need not the baseband chip and participate in.
Description
Technical field
The utility model belongs to field of radio frequency integrated circuits, is specifically related to the local oscillator leakage means for correcting of a kind of digital interface radio frequency transceiver and application thereof.
Background technology
Zero-intermediate-frequency transmitter because its structure is simple, integrated level is high, low in energy consumption, the features such as area is little, and required peripheral component is few are widely used at wireless communication field.But because production technology deviation, circuit design parameter design such as not to mate at the existence of many non-ideal factors, circuit is made to there is intrinsic DC maladjustment, the local oscillator leakage inevitably introduced after this DC maladjustment and local oscillation signal mixing, for zero-intermediate-frequency transmitter, larger local oscillator leakage will directly worsen launches EVM(vector amplitude error) and transmit scattering index not up to standard, reduce chip volume production yield, therefore local oscillator leakage must be carried out suppressing or correcting.The local oscillator leakage of the related algorithm radio frequency transmitter such as mostly adopt data to assist in base-band digital process chip in prior art carries out detecting and correcting, due to needs great amount of samples data, and need repeatedly complex calculation (as FFT computing), there is the processing time long, operand is large, realize the shortcomings such as complicated, and take a large amount of baseband chip hardware or software resource.
Utility model content
Based on above-mentioned background, the utility model proposes a kind of simple digital local oscillator and reveal correcting scheme, be directly integrated in radio frequency transceiver inside, utilize radio frequency transceiver own resources to carry out self-correcting, participate in without the need to baseband chip, its concrete technology contents is as follows:
A kind of local oscillator leakage means for correcting, comprises and launches local oscillator leakage detection module, calibration algorithm control module, transmitting I/Q signal direct current adjusting module, path selection switch, test signal generator, feedback switch and memory cell;
Described transmitting local oscillator leakage detection module connects the output of the receive path of radio frequency transceiver, to detect the size of local oscillator leakage;
Described calibration algorithm control module has the input connecting described transmitting local oscillator leakage detection module, and connect several outputs of described transmitting I/Q signal direct current adjusting module, path selection switch, feedback switch, to regulate and control those modules;
Described path selection switch has the first passage input connecting described test signal generator, and with the second channel input of bi-directional signal interface being connected radio frequency transceiver, its output connects described transmitting I/Q signal direct current adjusting module;
Described transmitting I/Q signal direct current adjusting module connects the input of the transmission channel of described radio frequency transceiver;
Described feedback switch is arranged between the transmission channel output of radio frequency transceiver and receive path input.
Described transmitting local oscillator leakage detection module comprises that cumulatively sue for peace in the cumulative summation in I road, I road absolute value, Q road, Q road absolute value, and the summation to I road absolute value and Q road absolute value.
Described transmitting I/Q signal direct current adjusting module comprises the signal direct current adjustment of I road and the adjustment of Q road signal direct current.
A kind of digital interface radio frequency transceiver, comprise transmission channel, receive path, bidirectional digital interface, duplexer, antenna and above-mentioned local oscillator leakage means for correcting, wherein, the transmitting I/Q signal direct current adjusting module of this local oscillator leakage means for correcting connects the transmission channel of described radio frequency transceiver; The transmitting local oscillator leakage detection module of this local oscillator leakage means for correcting connects the receive path of radio frequency transceiver.
Described transmission channel comprise connect successively variable gain amplifier, launch upper frequency mixer, emission filter and DAC, described receive path comprise connect successively low noise amplifier, receive down-conversion mixer, receive frequency overlapped-resistable filter and ADC; Wherein, described transmitting upper frequency mixer is connected local oscillator respectively with reception down-conversion mixer.
Compared with prior art, its advantageous exists the utility model:
1) at the inner direct integrated transmitting local oscillator leakage means for correcting of radio frequency transceiver, participate in without the need to base band; Namely utilize the launch and accept passage of radio frequency transceiver itself, add certain algorithm and control module, transmitting local oscillator leakage is corrected, saves the hardware of base band, software resource and processing time;
2) this device can when the improper transmitting of transmitter, obtains I road and the pre-dc-bias of Q road signal and stores; Automatically be loaded into I road and the pre-dc-bias of Q road signal to be corrected transmitting local oscillator leakage when normal transmission, thus do not affect normal transmission and modulation.
Accompanying drawing explanation
Fig. 1 is the overall theory diagram of digital interface radio frequency transceiver of the present utility model.
Fig. 2 is the theory diagram of transmitting local oscillator leakage detection module of the present utility model.
Fig. 3 is the theory diagram of transmitting I/Q signal direct current adjusting module of the present utility model.
Embodiment
Following 1-3 by reference to the accompanying drawings, is further described the application's scheme:
Terminological interpretation: DAC D-A converter; ADC analog-digital converter; LO local oscillator; I in-phase component; Q quadrature component.
A kind of local oscillator leakage means for correcting, be built in the middle of radio frequency transceiver, it comprises launches local oscillator leakage detection module 1, calibration algorithm control module 2, transmitting I/Q signal direct current adjusting module 3, path selection switch 4, test signal generator 5, feedback switch 6 and memory cell 7;
Described transmitting local oscillator leakage detection module 1 connects the output of the receive path 8 of radio frequency transceiver, to detect the size of local oscillator leakage;
Described calibration algorithm control module 2 has the input connecting described transmitting local oscillator leakage detection module 1, and connect several outputs of described transmitting I/Q signal direct current adjusting module 3, path selection switch 4, feedback switch 6, to regulate and control those modules;
Described path selection switch 4 has the first passage input connecting described test signal generator 5, and with the second channel input of bi-directional signal interface 10 being connected radio frequency transceiver, its output connects described transmitting I/Q signal direct current adjusting module 3;
Described transmitting I/Q signal direct current adjusting module 3 connects the input of the transmission channel 8 of described radio frequency transceiver;
Between transmission channel 8 output that described feedback switch is arranged at radio frequency receipts machine and receive path 9 input.
Described transmitting local oscillator leakage detection module 1 comprises that cumulatively sue for peace in the cumulative summation in I road, I road absolute value, Q road, Q road absolute value, and the summation to I road absolute value and Q road absolute value.
Described transmitting I/Q signal direct current adjusting module 3 comprises the signal direct current adjustment of I road and the adjustment of Q road signal direct current.
The embody rule of such scheme:
A kind of digital interface radio frequency transceiver, comprise transmission channel 8, receive path 9, bidirectional digital interface 10, duplexer 11, antenna 12 and above-mentioned local oscillator leakage means for correcting, wherein, the transmitting I/Q signal direct current adjusting module 3 of this local oscillator leakage means for correcting connects the transmission channel 8 of described radio frequency transceiver; The transmitting local oscillator leakage detection module 1 of this local oscillator leakage means for correcting connects the receive path 9 of radio frequency transceiver.
Described transmission channel 8 comprise connect successively variable gain amplifier 81, launch upper frequency mixer 82, emission filter 83 and DAC D-A converter 84, described receive path 9 comprise connect successively low noise amplifier 91, receive down-conversion mixer 92, receive frequency overlapped-resistable filter 93 and ADC analog-digital converter 94; Wherein, described transmitting upper frequency mixer 82 is connected local oscillator LO respectively with reception down-conversion mixer 92.
Each module work principle of the present utility model:
Described correcting algorithm control module 2 is for realizing the iteration of correcting algorithm (First-order Gradient method or claim minimum prompt drop method), namely with certain stepping, adjustment is superimposed upon the pre-dc-bias launched on digital I/Q signal, then according to the local oscillator leakage amplitude detected, automatically the step direction of this pre-direct current biasing is adjusted, so iterate, reach pre-set number of times until the local oscillator leakage amplitude detected cannot be reduced to the thresholding that presets or iterations;
Described transmitting I/Q signal direct current adjusting module 3 for cutting the output valve of correcting algorithm control module 2 as pre-direct current biasing from transmitting IQ digital signal, or the storing value in memory cell 7 cuts from transmitting IQ digital signal as pre-direct current biasing, thus reach the object that local oscillator leakage is corrected;
Described path selection switch 4 connects first passage and second channel for selecting, and namely receives the baseband digital signal from test signal generator 5 or bidirectional digital interface 10;
Described test signal generator 5, for generation of self-test signal, is digital single-carrier signal in the present embodiment;
Described feedback switch 6 will close automatically at local oscillator leakage timing, now emitting radio frequency signal feeds back to receive path, thus will launch local oscillator leakage detection module 1, correcting algorithm control module 2, transmitting I/Q signal direct current adjusting module 3, transmission channel 8 and a receive path 9 formation close loop negative feedback loop jointly;
The pre-dc-bias of I/Q signal that described memory cell 7 finally obtains for storing correcting algorithm control module 2, when normal transmission, will be automatically loaded in " launching I/Q signal direct current adjusting module 3 ";
It is as follows that this patent proposes local oscillator leakage correction principle flow process:
1) open receive path 9 when chip power-up initializing, correcting algorithm control module 2 is run receive path direct current and is corrected, the impact corrected for local oscillator leakage with the direct current eliminating receive path 9 itself;
2) open transmission channel 8, now sending and receiving passage is in opening simultaneously;
Control feedback switch 6 by correcting algorithm control module 2 to close, the digital single carrier test signal that control access selects opening 4 to select the first path to be produced by test signal generator 5 is simultaneously input in DAC;
This digital single carrier test signal is after transmission channel 8 is converted to radiofrequency signal, by feedback switch 6, this radio frequency signal feedback is input in receive path 9, LO(local oscillator due to transmission channel 8 and receive path 9) homology, the local oscillator leakage of transmission channel 8 will show as direct current offset in receive path 9, and the direct current offset of receive path 9 itself has corrected in step 1, therefore, the large young pathbreaker of this direct current offset directly reflects the amplitude size of local oscillator leakage;
3) by launching the amplitude detecting local oscillator leakage in local oscillator leakage detection module 1, and using the input signal of the amplitude of this local oscillator leakage as correcting algorithm and control module 2;
With certain stepping, adjustment is superimposed upon the pre-dc-bias launched on digital I/Q signal, then according to the local oscillator leakage amplitude detected, automatically the step direction of this pre-direct current biasing is adjusted, so iterate, reach pre-set number of times until the local oscillator leakage amplitude detected is reduced to the thresholding that presets or iterations;
4) the pre-direct current biasing of IQ that correcting algorithm finally obtains is stored in memory cell 7;
5) disconnect feedback switch 6, and second channel selected by control access selector switch 4, makes chip be in normal reiving/transmitting state; When normal transmission, launch the automatic pre-dc-bias of IQ be loaded in memory cell 7 storage of I/Q signal direct current adjusting module 3, and cut from transmitting IQ path, thus the object that when reaching normal transmission, local oscillator leakage corrects.
Above-mentioned preferred implementation should be considered as illustrating of the application's scheme implementation mode, allly to duplicate with the application's scheme, technology that is approximate or that make based on this is deduced, replaces, improvement etc., all should be considered as the protection range of this patent.
Claims (5)
1. a local oscillator leakage means for correcting, is characterized in that: comprise and launch local oscillator leakage detection module, calibration algorithm control module, transmitting I/Q signal direct current adjusting module, path selection switch, test signal generator, feedback switch and memory cell;
Described transmitting local oscillator leakage detection module connects the output of the receive path of radio frequency transceiver, to detect the size of local oscillator leakage;
Described calibration algorithm control module has the input connecting described transmitting local oscillator leakage detection module, and connect several outputs of described transmitting I/Q signal direct current adjusting module, path selection switch, feedback switch, to regulate and control those modules;
Described path selection switch has the first passage input connecting described test signal generator, and with the second channel input of bi-directional signal interface being connected radio frequency transceiver, its output connects described transmitting I/Q signal direct current adjusting module;
Described transmitting I/Q signal direct current adjusting module connects the input of the transmission channel of described radio frequency transceiver;
Described feedback switch is arranged between the transmission channel output of radio frequency transceiver and receive path input.
2. local oscillator leakage means for correcting according to claim 1, is characterized in that: described transmitting local oscillator leakage detection module comprises that cumulatively sue for peace in the cumulative summation in I road, I road absolute value, Q road, Q road absolute value, and the summation to I road absolute value and Q road absolute value.
3. local oscillator leakage means for correcting according to claim 1, is characterized in that: described transmitting I/Q signal direct current adjusting module comprises the signal direct current adjustment of I road and the adjustment of Q road signal direct current.
4. a digital interface radio frequency transceiver, comprise transmission channel, receive path, bidirectional digital interface, duplexer and antenna, it is characterized in that: also comprise the local oscillator leakage means for correcting as described in claim 1-3 any one, wherein, the transmitting I/Q signal direct current adjusting module of this local oscillator leakage means for correcting connects the transmission channel of described radio frequency transceiver; The transmitting local oscillator leakage detection module of this local oscillator leakage means for correcting connects the receive path of radio frequency transceiver.
5. a kind of digital interface radio frequency transceiver according to claim 4, it is characterized in that: described transmission channel comprise connect successively variable gain amplifier, launch upper frequency mixer, emission filter and DAC, described receive path comprise connect successively low noise amplifier, receive down-conversion mixer, receive frequency overlapped-resistable filter and ADC; Wherein, described transmitting upper frequency mixer is connected local oscillator respectively with reception down-conversion mixer.
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| CN201520737271.5U CN204967811U (en) | 2015-09-22 | 2015-09-22 | Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof |
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| CN201520737271.5U CN204967811U (en) | 2015-09-22 | 2015-09-22 | Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785206A (en) * | 2016-05-16 | 2016-07-20 | 中国电子科技集团公司第四十研究所 | System and method for testing pass-bands of multichannel frequency converter |
| CN108429557A (en) * | 2018-03-30 | 2018-08-21 | 深圳市盛路物联通讯技术有限公司 | Multi-filter Internet of Things radio circuit and terminal based on PIFA antennas |
| CN111181594A (en) * | 2019-12-17 | 2020-05-19 | 上海交通大学 | Transmitting local oscillator leakage digital calibration system and method based on radio frequency receiving and transmitting chip |
-
2015
- 2015-09-22 CN CN201520737271.5U patent/CN204967811U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785206A (en) * | 2016-05-16 | 2016-07-20 | 中国电子科技集团公司第四十研究所 | System and method for testing pass-bands of multichannel frequency converter |
| CN108429557A (en) * | 2018-03-30 | 2018-08-21 | 深圳市盛路物联通讯技术有限公司 | Multi-filter Internet of Things radio circuit and terminal based on PIFA antennas |
| CN111181594A (en) * | 2019-12-17 | 2020-05-19 | 上海交通大学 | Transmitting local oscillator leakage digital calibration system and method based on radio frequency receiving and transmitting chip |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Zhao Inventor after: Jiang Hongbo Inventor before: Wang Zhao Inventor before: Jiang Hongbo |
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| COR | Change of bibliographic data | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Digital interface radio frequency transceiving machine and correcting unit is revealed to local oscillator of using thereof Effective date of registration: 20161213 Granted publication date: 20160113 Pledgee: Bank of China Limited by Share Ltd Zhongshan branch Pledgor: Guangdong Bo Weier Electronic Science and Technology Co., Ltd. Registration number: 2016440000030 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model |