CN104270097B - The processing system and method that upconversion transmitter local-oscillator leakage and sideband suppress - Google Patents
The processing system and method that upconversion transmitter local-oscillator leakage and sideband suppress Download PDFInfo
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- CN104270097B CN104270097B CN201410457763.9A CN201410457763A CN104270097B CN 104270097 B CN104270097 B CN 104270097B CN 201410457763 A CN201410457763 A CN 201410457763A CN 104270097 B CN104270097 B CN 104270097B
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Abstract
The present invention provides the processing system and method that a kind of a upconversion transmitter local-oscillator leakage and sideband suppress, including：Temperature sensor exports a magnitude of voltage according to current environmental temperature and is transferred to analog-digital converter；The magnitude of voltage is converted into data signal and is transferred to control module by the analog-digital converter；The control module obtains a predeterminated frequency, transmits to frequency synthesizer, with frequency synthesis.The control module determines current environmental temperature according to the data signal simultaneously, and suppressing the retrieval of adjusted value form by default frequency temperature local-oscillator leakage and sideband is adjusted value, transmits to the control unit of digital analog converter；The frequency of the frequency synthesizer synthesis is transmitted to quadrature modulator as the local oscillation signal of quadrature modulator；After the digital analog converter two-way difference output, I roads and the Q roads differential input end of quadrature modulator are connected to.The present invention is effectively in entirely output frequency range and the temperature range of requirement, retrieved by form, it is adjusted value, control the internal element of the digital analog converter, the local-oscillator leakage and sideband for adjusting quadrature modulator output end suppress, and improve the situation that a upconversion transmitter local-oscillator leakage and sideband suppress.
Description
Technical field
The present invention relates to communication technique field, more particularly to a kind of a upconversion transmitter local-oscillator leakage and sideband suppress
Processing system and method.
Background technology
One time upconversion transmitter circuit structure is simple, there is obvious advantage in terms of volume, power consumption and cost.So
And a up-conversion technology uses analog quadrature modulation, due to orthogonal demodulation signal and orthogonal local oscillation signal amplitude and phase
Imbalance, and direct current biasing error, cause to produce local-oscillator leakage and unwanted sideband；Wherein, the local-oscillator leakage refers to leak
To the local oscillation signal of quadrature modulator delivery outlet.In addition, with the change of temperature and frequency, local-oscillator leakage and useless side can be caused
The situation of band changes, and makes the optimum value of local-oscillator leakage and unwanted sideband after some temperature spot, the adjustment of some Frequency point, hair
It is raw to deteriorate, so as to influence the quality of output signal.Therefore need to handle local-oscillator leakage, unwanted sideband suppressed,
The sideband suppresses to refer to during analog quadrature modulation, to the rejection ability of unwanted sideband signal, with unwanted sideband signal
The decibels of the ratio between level and useful sideband signals level represent.
The content of the invention
It is an object of the invention to provide the processing system that an a kind of upconversion transmitter local-oscillator leakage and sideband suppress
And method, to solve the problems, such as that an existing upconversion transmitter produces local-oscillator leakage and unwanted sideband.
In order to solve the above technical problems, the present invention provides what a kind of a upconversion transmitter local-oscillator leakage and sideband suppressed
Processing system, including：
Temperature sensor；
Analog-digital converter, its input are connected with the output end of the temperature sensor；
Control module, its input are connected with the output end of the analog-digital converter；
Digital analog converter, its input are connected with the output end of the control module；
Frequency synthesizer, its input are connected with the output end of the control module；
Quadrature modulator, its input are connected with the output end of the frequency synthesizer, and the digital analog converter is double
Road difference output end difference is connected to I roads and the Q roads differential input end of the quadrature modulator.
Meanwhile the present invention also provides the processing method that a kind of a upconversion transmitter local-oscillator leakage and sideband suppress, bag
Include：
Temperature sensor exports a magnitude of voltage according to current environmental temperature and is transferred to analog-digital converter；
The magnitude of voltage is converted into data signal and is transferred to control module by the analog-digital converter；
The control module obtains a predeterminated frequency, transmits to frequency synthesizer with frequency synthesis, while according to the number
Word signal determines current environmental temperature, and suppressing adjusted value form by default a frequency-temperature-local-oscillator leakage and sideband retrieves
Value is adjusted, is transmitted to the control unit of digital analog converter；
The frequency of the frequency synthesizer synthesis is transmitted to quadrature modulator as the local oscillation signal of quadrature modulator；It is described
After the adjustment of digital analog converter two-way difference output, I roads and the Q roads differential input end of quadrature modulator are connected to.
Further, it is described in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress
Default frequency-temperature-local-oscillator leakage and sideband suppress adjusted value form and established by following steps：
The actual influence suppressed according to frequency and temperature to local-oscillator leakage and sideband, determine frequency and temperature adjustment point；
According to the adjustment of each frequency and temperature point, control module is adjusted by controlling the unit inside digital analog converter
The carrier leak and sideband of quadrature modulator output end suppress, and are calibrated to most preferably, and the digital-to-analogue for forming the frequency and temperature adjustment point turns
The adjusted value of the internal element of parallel operation；
By that analogy, form the local-oscillator leakage of all frequency and temperature adjustment points and sideband suppresses the form of adjusted value.
Further, in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress, in institute
Default frequency-temperature-local-oscillator leakage and sideband is stated to suppress between frequency described in adjusted value form and environment temperature adjustment point
Every being equidistant.
Further, in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress, in institute
Default frequency-temperature-local-oscillator leakage and sideband is stated to suppress between frequency described in adjusted value form and environment temperature adjustment point
Every being non-isometric.
Further, it is described in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress
Frequency synthesizer passes through the frequency after the synthesis adjustment of frequency phase lock ring synthetic method.
Further, it is described in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress
Frequency synthesizer passes through the frequency after the synthesis adjustment of frequency direct digital synthesizers method.
Further, in the processing method that a described upconversion transmitter local-oscillator leakage and sideband suppress, in institute
State default frequency-temperature-local-oscillator leakage and sideband suppress temperature and frequency adjustment point in adjusted value form be it is discrete, it is described
The actual temperature measured of control module and frequency carry out retrieval table with closest principle, obtain the default frequency-temperature
Degree-local-oscillator leakage and sideband suppress adjusted value.
The processing system and method that a upconversion transmitter local-oscillator leakage and sideband provided by the invention suppress, have with
Lower beneficial effect：The present invention effectively in entirely output frequency range and the temperature range of requirement, is retrieved by form, is adjusted
Value, the internal element of the digital analog converter is controlled, the local-oscillator leakage and sideband for adjusting quadrature modulator output end suppress, and improve
The situation that upconversion transmitter local-oscillator leakage and sideband suppress.
Brief description of the drawings
Fig. 1 is that the structure for the processing system that upconversion transmitter local-oscillator leakage of the embodiment of the present invention and sideband suppress is shown
It is intended to；
Fig. 2 is the flow for the processing method that upconversion transmitter local-oscillator leakage of the embodiment of the present invention and sideband suppress
Figure.
Embodiment
Below in conjunction with the drawings and specific embodiments to a upconversion transmitter local-oscillator leakage proposed by the present invention and sideband
The processing system and method for suppression are described in further detail.According to following explanation and claims, advantages of the present invention and
Feature will become apparent from.It should be noted that accompanying drawing uses using very simplified form and non-accurately ratio, only to side
Just the purpose of the embodiment of the present invention, is lucidly aided in illustrating.
Fig. 1 is refer to, it is the processing system that upconversion transmitter local-oscillator leakage of the embodiment of the present invention and sideband suppress
The structural representation of system.As shown in figure 1, the present invention provides the place that a kind of a upconversion transmitter local-oscillator leakage and sideband suppress
Reason system, including：
Temperature sensor 11；
Analog-digital converter 12 (ADC), its input are connected with the output end of the temperature sensor 11；
Control module 13, its input are connected with the output end of the analog-digital converter 12；
Digital analog converter 14 (DAC), its input are connected with the output end of the control module 13；
Frequency synthesizer 15, its input are connected with the output end of the control module 13；
Quadrature modulator 16, its input is connected with the output end of the frequency synthesizer 15, and the digital-to-analogue conversion
The two-way difference output end difference of device 14 is connected to I roads and the Q roads differential input end of the quadrature modulator 16.
Further, Fig. 2 is refer to, the present invention provides what a kind of a upconversion transmitter local-oscillator leakage and sideband suppressed
Processing method, the processing system suppressed based on a described upconversion transmitter local-oscillator leakage and sideband, is specifically included as follows
Step：
First, temperature sensor exports a magnitude of voltage according to current environmental temperature and is transferred to analog-digital converter, the electricity
A corresponding relation be present with the environment temperature in pressure value；
Then, the magnitude of voltage is converted into data signal and is transferred to control module by the analog-digital converter；
Then, the control module obtains a predeterminated frequency, transmits to frequency synthesizer, with frequency synthesis.It is meanwhile described
Control module determines current environmental temperature according to the data signal, while obtains a default frequency of upconversion transmitter,
Value is adjusted by inquiring about default frequency-temperature-local-oscillator leakage and sideband suppression adjusted value form, is transmitted to digital-to-analogue conversion
The control unit of device；
Specifically, the default frequency-temperature-local-oscillator leakage and sideband suppress adjusted value form and pass through following steps
Establish：The actual influence suppressed according to frequency and temperature to local-oscillator leakage and sideband, determine frequency and temperature adjustment point；According to every
The adjustment point of individual frequency and temperature, control module is by controlling the unit inside digital analog converter, adjustment quadrature modulator output
The local-oscillator leakage and sideband at end suppress, and are calibrated to inside that is optimal, and forming the digital analog converter of the frequency and temperature adjustment point
The adjusted value of unit；By that analogy, form the local-oscillator leakage of all frequency and temperature adjustment points and sideband suppresses the table of adjusted value
Lattice.
Because the default frequency-temperature-local-oscillator leakage and sideband suppress temperature and frequency adjustment in adjusted value form
Point is discrete, and the actual temperature measured of the control module and frequency carry out retrieval table with closest principle, obtain institute
State default frequency-temperature-local-oscillator leakage and sideband and suppress adjusted value
Further, the default frequency-temperature-local-oscillator leakage and sideband suppress in adjusted value form, the frequency
Interval with environment temperature adjustment point can be equidistant or non-isometric.
Finally, the frequency of the frequency synthesizer synthesis is transmitted to orthogonal modulation as the local oscillation signal of quadrature modulator
Device；After the digital analog converter two-way difference output, I roads and the Q roads differential input end of quadrature modulator, adjust automatically are connected to
The local-oscillator leakage and sideband of the quadrature modulator suppress.
Specifically, the frequency synthesizer is adjusted by frequency phase lock ring synthetic method or the synthesis of frequency direct digital synthesizers method
Frequency after whole.
Base this, the present invention effectively entirely output frequency range and requirement temperature range, retrieved, be adjusted by form
Value, the internal element of the digital analog converter is controlled, the local-oscillator leakage and sideband for adjusting quadrature modulator output end suppress, and improve
The situation that upconversion transmitter local-oscillator leakage and sideband suppress.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (7)
- A kind of 1. processing method that a upconversion transmitter local-oscillator leakage and sideband suppress, it is characterised in that including：Temperature sensor exports a magnitude of voltage according to current environmental temperature and is transferred to analog-digital converter；The magnitude of voltage is converted into data signal and is transferred to control module by the analog-digital converter；The control module obtains a predeterminated frequency, transmits to frequency synthesizer with frequency synthesis, while is believed according to the numeral Number current environmental temperature is determined, suppress adjusted value form by default frequency-temperature-local-oscillator leakage and sideband and retrieve to be adjusted Whole value, transmit to the control unit of digital analog converter；The frequency of the frequency synthesizer synthesis is transmitted to quadrature modulator as the local oscillation signal of quadrature modulator；The digital-to-analogue After converter two-way difference output, I roads and the Q roads differential input end of quadrature modulator are connected to.
- 2. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 and sideband suppress, its feature exist In the default frequency-temperature-local-oscillator leakage and sideband suppress adjusted value form and established by following steps：The actual influence suppressed according to frequency and temperature to local-oscillator leakage and sideband, determine frequency and temperature adjustment point；According to the adjustment of each frequency and temperature point, the control module by controlling the internal element of the digital analog converter, The carrier leak and sideband for adjusting quadrature modulator output end suppress, and are calibrated to number that is optimal, and forming the frequency and temperature adjustment point The adjusted value of the internal element of weighted-voltage D/A converter；By that analogy, form the local-oscillator leakage of all frequency and temperature adjustment points and sideband suppresses the form of adjusted value.
- 3. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 or 2 and sideband suppress, its feature It is, suppresses frequency described in adjusted value form in the default frequency-temperature-local-oscillator leakage and sideband and environment temperature is adjusted The interval of integral point is equidistant.
- 4. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 or 2 and sideband suppress, its feature It is, suppresses frequency described in adjusted value form in the default frequency-temperature-local-oscillator leakage and sideband and environment temperature is adjusted The interval of integral point is non-isometric.
- 5. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 and sideband suppress, its feature exist In the frequency synthesizer passes through the frequency after the synthesis adjustment of frequency phase lock ring synthetic method.
- 6. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 and sideband suppress, its feature exist In the frequency synthesizer passes through the frequency after the synthesis adjustment of frequency direct digital synthesizers method.
- 7. the processing method that a upconversion transmitter local-oscillator leakage as claimed in claim 1 or 2 and sideband suppress, its feature Be, in the default frequency-temperature-local-oscillator leakage and sideband suppress adjusted value form temperature and frequency adjustment point be from Scattered, the actual temperature measured of the control module and frequency carry out retrieval table with closest principle, obtain described default Frequency-temperature-local-oscillator leakage and sideband suppress adjusted value.
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| CN106559040A (en) * | 2015-09-25 | 2017-04-05 | 苏州普源精电科技有限公司 | The poor orthogonal phase splitter of calibration phase of output signal, modulator/demodulator and its method |
| CN106850083B (en) * | 2017-03-24 | 2020-02-07 | 京信通信系统（中国）有限公司 | Method for inhibiting local oscillator leakage signal, circuit board and communication equipment |
| CN107634786A (en) * | 2017-09-21 | 2018-01-26 | 北京联诚智航科技有限公司 | A kind of frequency hopping communications emission system and method |
| CN113839683B (en) * | 2021-11-29 | 2022-02-18 | 广东省新一代通信与网络创新研究院 | Method and system for automatically improving out-of-band blocking |
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