CN1863221A - Apparatus for detecting local oscillator leakage - Google Patents
Apparatus for detecting local oscillator leakage Download PDFInfo
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- CN1863221A CN1863221A CNA2005100695425A CN200510069542A CN1863221A CN 1863221 A CN1863221 A CN 1863221A CN A2005100695425 A CNA2005100695425 A CN A2005100695425A CN 200510069542 A CN200510069542 A CN 200510069542A CN 1863221 A CN1863221 A CN 1863221A
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- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 238000004891 communication Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
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Abstract
The invention provides a local oscillation (LO) leakage detecting device, mainly comprising: signal collection and amplification unit, for collecting LO leakage signal from the output signal of a transmitter and amplifying the collected signal by set amplification amplitude and then transmitting the amplified signal to a frequency divider; frequency divider, for making frequency division on the received LO leakage signal as the received LO leakage signal reaches the threshold value that it can normally work and transmitting the frequency-divided signal to a counter; counter, for counting according to the received frequency-divided signal and outputting a control signal as its count value reaches some set value in a certain time range. And the invention can use small numbers of detecting devices to relatively accurately detect magnitude of the LO leakage signal.
Description
Technical field
The present invention relates to field of wireless communication, relate in particular to a kind of checkout gear of local-oscillator leakage.
Background technology
Along with the development of wireless communication technique, related wireless communication equipment is faced with the requirement of dwindling package dimension, reducing power consumption, reduce part count and reduce cost.Along with the fast development of integrated circuit processing technique, wireless transceiver system has realized highly integrated.Zero intermediate frequency transceiver (using the transceiver of direct transformational structure) has become the main flow and the inevitable choice of integrated circuit (IC) design in the transceiver system among the present WLAN (WLAN (wireless local area network)).
The zero intermediate frequency technology is also referred to as the Direct Conversion technology, and it is meant at transmitting terminal information to be converted directly on the transmission band and exports, then directly recovers information from transmission band at receiving terminal.The zero intermediate frequency transceiver has the advantage that overall structure is simple, number of parts is few.But the zero intermediate frequency transceiver also exists more serious problems such as some local-oscillator leakages, dc shift.The schematic diagram of local-oscillator leakage as shown in Figure 1.Local-oscillator leakage is meant because the intrinsic DC maladjustment characteristic of circuit, causes occurring to the path of antenna at transmitter output signal the leakage of local oscillation signal.According to some wireless communication protocols, such as the IEEE802.11 agreement of WLAN, when local-oscillator leakage is bigger, will produce bigger harmful effect to the performance of whole communication system, for example produce the high error rate, communication disruption or Communication Jamming or the like.
The removing method of existing local-oscillator leakage comprises feedback calibration method or the like.Realize that the elimination of local-oscillator leakage must at first detect the size of local oscillator leakage signals, the detection method of existing a kind of local-oscillator leakage detects the size of local oscillator leakage signals for using the analog circuit that comprises a series of logarithmic amplifier.The shortcoming of this method is that the analog circuit that is adopted not only needs bigger power consumption of consumption rate and chip area, but also may produce extra nonlinear problem, and therefore, the signal magnitude of the local-oscillator leakage that this method is detected is inaccurate.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of checkout gear of local-oscillator leakage, thereby can use less detection means to detect the size of local oscillator leakage signals more exactly.
The objective of the invention is to be achieved through the following technical solutions:
A kind of checkout gear of local-oscillator leakage comprises:
Signals collecting and amplifying unit: be used for gathering out local oscillator leakage signals, and the signal of gathering amplified, then, amplifying signal is passed to frequency divider according to the enlargement range of setting from the output signal of transmitter;
Frequency divider: be used for when the local oscillator leakage signals that receives reaches the threshold value that frequency divider can operate as normal, the local oscillator leakage signals that receives being carried out divide operation, and the signal behind the frequency division being passed to counter;
Counter: be used for carrying out counting operation,, when the value of rolling counters forward reaches a certain set point, export a control signal when in the regular hour scope according to the fractional frequency signal that receives.
The enlargement range of described signals collecting and amplifying unit is determined according to the threshold value of the local oscillator leakage signals size of default.
The control signal of described counter output can the Control and Feedback calibration circuit be eliminated the local-oscillator leakage of transmitter.
Described signals collecting and amplifying unit comprise:
Signal coupler spare: be used for detecting local oscillator leakage signals with the method that is coupled, and detected local oscillator leakage signals is passed to variable gain amplifier from the output signal of transmitter;
Variable gain amplifier: be used for the local oscillator leakage signals that receives is amplified, and the signal after will amplifying passing to frequency divider according to the yield value of setting.
Described signal coupler spare can be electric capacity, and this electric capacity is on certain signal node that is connected between the antenna of transmitter and transmitter.
The yield value of described variable gain amplifier is determined according to the threshold value of the local oscillator leakage signals size of default.
Described signals collecting and amplifying unit comprise:
Signal coupler spare: be used for detecting local oscillator leakage signals with the method that is coupled, and detected local oscillator leakage signals is passed to frequency mixer from the output signal of transmitter;
Frequency mixer: the local oscillator leakage signals and the test that are used for receiving are carried out mixing operation with local oscillation signal, obtain low frequency signal, and this low frequency signal is passed to variable gain amplifier;
Variable gain amplifier: be used for the low frequency signal that receives is amplified, and the signal after will amplifying passing to frequency divider according to the yield value of setting.
The test that described frequency mixer receives can produce by circular type shaker with local oscillation signal.
The difference of the frequency of the centre frequency of described circular type shaker and the local oscillation signal of transmitter meets a frequency range of setting.
Described transmitter can be the part in the zero intermediate frequency transceiver in the WLAN (wireless local area network).
As seen from the above technical solution provided by the invention, the present invention uses detection means such as frequency divider sum counter to detect local oscillator leakage signals, and then can adopt the feedback calibration method to realize the elimination of local-oscillator leakage.The present invention compares with prior art, has following advantage: the present invention only needs fewer detection means such as frequency divider sum counter, implements simple; The present invention has low-power consumption, characteristics cheaply; The present invention can detect the size of local oscillator leakage signals more exactly.
Description of drawings
Fig. 1 is the schematic diagram of local-oscillator leakage;
Fig. 2 is the structure chart of device of the present invention;
Fig. 3 is a kind of specific implementation structure chart of device of the present invention;
Fig. 4 is a kind of specific implementation structure chart of device of the present invention;
Fig. 5 has eliminated the output signal schematic diagram of transceiver behind the local-oscillator leakage.
Embodiment
The invention provides a kind of checkout gear of local-oscillator leakage, core of the present invention is: only need fewer detection means such as frequency divider sum counter, can detect the size of local oscillator leakage signals more exactly.
Describe the present invention in detail below in conjunction with accompanying drawing, the structure chart of device of the present invention comprises as shown in Figure 2 as lower module:
Signals collecting and amplifying unit: be used for gathering out local oscillator leakage signals, and the signal of gathering carried out certain amplification, then, amplifying signal is passed to frequency divider according to the enlargement range of setting from the output signal of transmitter.
Can set according to actual needs the amplitude that the signal of gathering amplifies, in the time the value of local-oscillator leakage need being controlled at very little scope, the amplitude that can amplify is set to a bigger value; In the time the value of local-oscillator leakage need being controlled at bigger scope, the amplitude that can amplify is set to a smaller value.
Frequency divider: be used for when the local oscillator leakage signals that receives reaches the threshold value that frequency divider can operate as normal, the local oscillator leakage signals that receives being carried out divide operation, and the signal behind the frequency division being passed to counter.
The threshold value of frequency divider can be set according to the threshold value of local-oscillator leakage size, the actual conditions such as amplitude of amplification.
Counter: be used for carrying out counting operation,, when the value of rolling counters forward reaches a certain set point, export a signal, inform the local oscillator leakage signals that detects a certain size to control circuit when in the regular hour scope according to the fractional frequency signal that receives.
The set point of counter can be set according to actual conditions, such as: can be set in the official hour, the number in the counter reaches at 2 o'clock, and signal of counter output is given control circuit, makes feedback circuit move.Then, can adopt described feedback calibration method or other feedback method and algorithm to eliminate local-oscillator leakage.The output signal schematic diagram of having eliminated transceiver behind the local-oscillator leakage as shown in Figure 5.
Signals collecting in the device of the present invention and amplifying unit can realize that wherein, the function of signal coupler spare and variable gain amplifier is as follows by signal coupler spare and variable gain amplifier:
Signal coupler spare: be used in the path of transmitter to antenna, the method with coupling from the output signal of transmitter detects local oscillator leakage signals, and detected local oscillator leakage signals is passed to variable gain amplifier.
Because in the ordinary course of things, when transceiver was in startup and holding state, the frequency synthesizer circuit was work.Therefore, signal coupler spare can be coupled, detect and proofread and correct with the local oscillator leakage signals of this period to transmitter output.
Signal coupler spare among the present invention can be electric capacity, and this electric capacity can be connected on certain signal node between the antenna of transmitter and transmitter.
Variable gain amplifier: be used for the local oscillator leakage signals that receives is amplified, and the signal after will amplifying passing to frequency divider according to the yield value of setting.
The yield value of variable gain amplifier can be set according to actual needs.In the time the value of local-oscillator leakage need being controlled at very little scope, just can transfer the yield value of variable gain amplifier greatly, so, very little leakage signal is amplified the back through variable gain amplifier and just can be worked and output signal so that frequency divider is correct; In the time the value of local-oscillator leakage need being controlled at bigger scope, just can turn the yield value of variable gain amplifier down, so, just can be after having only bigger leakage signal to amplify so that correct work of frequency divider and output signal through variable gain amplifier.
When having used electric capacity and variable gain amplifier, a kind of specific implementation structure chart of device of the present invention as shown in Figure 3.
When working under high frequency situations in order to solve variable gain amplifier and frequency divider, the problem of design more complicated the present invention is directed to device shown in Figure 3 and has also proposed a kind of modifying device, and the specific implementation structure chart of this modifying device as shown in Figure 4.Be specially and between electric capacity and variable gain amplifier, increased a frequency mixer.The function of electric capacity, frequency mixer and variable gain amplifier is as follows in device shown in Figure 4:
Electric capacity: be used in the path of transmitter to antenna, the method with coupling from the output signal of transmitter detects local oscillator leakage signals, and detected local oscillator leakage signals is passed to frequency mixer.
This electric capacity can also be other signal coupler spare.
Frequency mixer: the local oscillator leakage signals and the test that are used for receiving are carried out mixing operation with local oscillation signal, obtain low frequency signal, and this low frequency signal is passed to variable gain amplifier.
The test that frequency mixer receives can produce by the circular type shaker of low-power consumption, low-cost free-running operation with local oscillation signal.Because for certain particular communication device, such as transceiver, the frequency of local oscillation signal is in certain fixing frequency range.Therefore, as long as the difference of the frequency of the centre frequency of the circular type shaker of described free-running operation and local oscillation signal is set within a certain lower frequency range, such as: 50HZ.To carry out the signal that mixing operation obtains later on be exactly low frequency signal to frequency mixer so.
Variable gain amplifier: be used for the local oscillator leakage signals that receives is amplified, and the signal after will amplifying passes to frequency divider.
Because this moment, the signal that receives of variable gain amplifier was a low frequency signal, so variable gain amplifier need not be operated in high frequency, the local oscillator leakage signals that just can amplification detection arrives with the variable gain amplifier of low frequency.Equally, the frequency divider in device shown in Figure 4 also need not be operated in high frequency.Therefore, when this device has avoided variable gain amplifier and frequency divider to work under high frequency situations, the problem of design more complicated.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of checkout gear of local-oscillator leakage is characterized in that, comprising:
Signals collecting and amplifying unit: be used for gathering out local oscillator leakage signals, and the signal of gathering amplified, then, amplifying signal is passed to frequency divider according to the enlargement range of setting from the output signal of transmitter;
Frequency divider: be used for when the local oscillator leakage signals that receives reaches the threshold value that frequency divider can operate as normal, the local oscillator leakage signals that receives being carried out divide operation, and the signal behind the frequency division being passed to counter;
Counter: be used for carrying out counting operation,, when the value of rolling counters forward reaches a certain set point, export a control signal when in the regular hour scope according to the fractional frequency signal that receives.
According to the checkout gear of the described local-oscillator leakage of claim 1, it is characterized in that 2, the enlargement range of described signals collecting and amplifying unit is determined according to the threshold value of the local oscillator leakage signals size of default.
According to the checkout gear of the described local-oscillator leakage of claim 1, it is characterized in that 3, the control signal of described counter output can the Control and Feedback calibration circuit be eliminated the local-oscillator leakage of transmitter.
According to the checkout gear of claim 1,2 or 3 described local-oscillator leakages, it is characterized in that 4, described signals collecting and amplifying unit comprise:
Signal coupler spare: be used for detecting local oscillator leakage signals with the method that is coupled, and detected local oscillator leakage signals is passed to variable gain amplifier from the output signal of transmitter;
Variable gain amplifier: be used for the local oscillator leakage signals that receives is amplified, and the signal after will amplifying passing to frequency divider according to the yield value of setting.
According to the checkout gear of the described local-oscillator leakage of claim 4, it is characterized in that 5, described signal coupler spare can be electric capacity, and this electric capacity is on certain signal node that is connected between the antenna of transmitter and transmitter.
According to the checkout gear of the described local-oscillator leakage of claim 5, it is characterized in that 6, the yield value of described variable gain amplifier is determined according to the threshold value of the local oscillator leakage signals size of default.
According to the checkout gear of claim 1,2 or 3 described local-oscillator leakages, it is characterized in that 7, described signals collecting and amplifying unit comprise:
Signal coupler spare: be used for detecting local oscillator leakage signals with the method that is coupled, and detected local oscillator leakage signals is passed to frequency mixer from the output signal of transmitter;
Frequency mixer: the local oscillator leakage signals and the test that are used for receiving are carried out mixing operation with local oscillation signal, obtain low frequency signal, and this low frequency signal is passed to variable gain amplifier;
Variable gain amplifier: be used for the low frequency signal that receives is amplified, and the signal after will amplifying passing to frequency divider according to the yield value of setting.
According to the checkout gear of the described local-oscillator leakage of claim 7, it is characterized in that 8, the test that described frequency mixer receives can produce by circular type shaker with local oscillation signal.
9, the checkout gear of described local-oscillator leakage according to Claim 8 is characterized in that, the difference of the frequency of the centre frequency of described circular type shaker and the local oscillation signal of transmitter meets a frequency range of setting.
According to the checkout gear of the described local-oscillator leakage of claim 1, it is characterized in that 10, described transmitter can be the part in the zero intermediate frequency transceiver in the WLAN (wireless local area network).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100695425A CN100553265C (en) | 2005-05-13 | 2005-05-13 | The checkout gear of local-oscillator leakage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100695425A CN100553265C (en) | 2005-05-13 | 2005-05-13 | The checkout gear of local-oscillator leakage |
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| CN1863221A true CN1863221A (en) | 2006-11-15 |
| CN100553265C CN100553265C (en) | 2009-10-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527577A (en) * | 2008-03-05 | 2009-09-09 | 北京六合万通微电子技术股份有限公司 | Wireless transmitter and method for eliminating local oscillation leakage in wireless transmitter |
| CN102457339A (en) * | 2012-02-08 | 2012-05-16 | 国家无线电监测中心 | Radio transmission equipment monitoring system and method |
| CN105991395A (en) * | 2015-01-30 | 2016-10-05 | 杭州迪普科技有限公司 | Attachment replacing method and attachment replacing device |
-
2005
- 2005-05-13 CN CNB2005100695425A patent/CN100553265C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527577A (en) * | 2008-03-05 | 2009-09-09 | 北京六合万通微电子技术股份有限公司 | Wireless transmitter and method for eliminating local oscillation leakage in wireless transmitter |
| CN101527577B (en) * | 2008-03-05 | 2013-07-17 | 北京六合万通微电子技术股份有限公司 | Wireless transmitter and method for eliminating local oscillation leakage in wireless transmitter |
| CN102457339A (en) * | 2012-02-08 | 2012-05-16 | 国家无线电监测中心 | Radio transmission equipment monitoring system and method |
| CN105991395A (en) * | 2015-01-30 | 2016-10-05 | 杭州迪普科技有限公司 | Attachment replacing method and attachment replacing device |
| CN105991395B (en) * | 2015-01-30 | 2019-04-09 | 杭州迪普科技股份有限公司 | Attachment replacement method and device |
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| CN100553265C (en) | 2009-10-21 |
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Assignee: Hangzhou West Stemm Microelectronics Technology Co Ltd Assignor: Beijing LHWT Microelectronics Inc. Contract record no.: 2011110000012 Denomination of invention: Apparatus for detecting local oscillator leakage Granted publication date: 20091021 License type: Exclusive License Open date: 20061115 Record date: 20110308 |
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