CN105430232A - Signal compensation circuit and device - Google Patents
Signal compensation circuit and device Download PDFInfo
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- CN105430232A CN105430232A CN201510787579.5A CN201510787579A CN105430232A CN 105430232 A CN105430232 A CN 105430232A CN 201510787579 A CN201510787579 A CN 201510787579A CN 105430232 A CN105430232 A CN 105430232A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
- H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
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Abstract
The invention is applicable for the field of signal compensation, and provides a signal compensation circuit and device. The signal compensation circuit comprising a signal generation module, an amplitude-limiting control module and a signal processing module is adopted in the signal compensation device; the signal generation module after processing a radio-frequency signal based on a preset reference voltage outputs a first compensation signal having the phase position opposite to that of the radio-frequency signal; the amplitude-limiting control module performs amplitude-limiting processing for the first compensation signal based on an amplitude-limiting control signal; and the signal processing module after amplifying the processed first compensation signal outputs a compensation signal having the phase position opposite to that of a time delay radio-frequency signal and having the amplitude as same as that of the time delay radio-frequency signal. Therefore, the purpose of generating the compensation signal having the phase position opposite to that of the radio-frequency signal output by a radio frequency signal source and having the amplitude as same as that of the radio-frequency signal is realized.
Description
Technical field
The invention belongs to signal compensation field, particularly relate to a kind of signal compensation circuit and device.
Background technology
Along with the universal and application of signal compensation technology in cable television system, fiber optic transmission system is also developed thereupon rapidly.And in fiber optic transmission system, signal compensation apparatus is the nucleus equipment of whole system, its effect is that the rf signal of input is modulated into light signal, and sends continuous, stable, reliable light signal to cable system.Signal compensation apparatus is made up of radio-frequency signal source, laser, laser control circuit, modulation control circuit, microprocessor, signal compensation circuit, photodetector, RF signal attenuator, amplifier, power supply etc.Wherein the device of most critical is radio-frequency signal source, and the characteristic curve of conventional radio-frequency signal source is SIN function curve, will cause nonlinear distortion when the rf signal inputted has exceeded the modulation range of radio-frequency signal source.
But current signal compensation circuit cannot regulate to realize realizing mating completely with the characteristic curve of radio-frequency signal source automatically, also cannot realize mating with different radio frequency signal source.
Summary of the invention
The object of the present invention is to provide a kind of signal compensation circuit of signal compensation apparatus, be intended to solve the compensating signal existing for signal compensation circuit that provides of prior art cannot automatically regulate to realize realizing mating completely with the characteristic curve of radio-frequency signal source, while also cannot realize the problem of mating with different radio frequency signal source.
The present invention realizes like this, a kind of signal compensation circuit of signal compensation apparatus, be connected with the optical branching device in signal compensation apparatus and signal mixer, the radiofrequency signal that radio-frequency signal source exports after filtering module filtered and described optical branching device along separate routes after export time delay module and described signal compensation circuit respectively to, export after the time delay radiofrequency signal that described time delay module exports by described signal mixer and the compensating signal that described signal compensation circuit exports carry out mixed processing;
Described signal compensation circuit comprises:
Input connects the output of described optical branching device, and control end access predetermined reference voltage, processes the signal generation module of rear output one first compensating signal contrary with described radiofrequency signal phase place to described radiofrequency signal according to described predetermined reference voltage;
Input connects the output of described signal generation module, and control end access amplitude limit control signal, carries out the amplitude limit control module of amplitude limiting processing by described first compensating signal according to described amplitude limit control signal;
Input and output are connected the output of described amplitude limit control module and described signal mixer respectively, export after described first compensating signal after described amplitude limit control module amplitude limiting processing is amplified one with described time delay radiofrequency signal phase place on the contrary and the signal processing module of the identical described compensating signal of amplitude.
Another object of the present invention is also to provide a kind of signal compensation apparatus, and described signal compensation apparatus comprises filtration module, optical branching device, time delay module, signal mixer and described signal compensation circuit.
The present invention comprises signal generation module by adopting in signal compensation apparatus, the signal compensation circuit of amplitude limit control module and signal processing module, carried out processing rear output one first compensating signal contrary with described radiofrequency signal phase place according to predetermined reference voltage radio frequency signal by described signal generation module, according to amplitude limit control signal, described first compensating signal is carried out amplitude limiting processing by described amplitude limit control module, and carry out amplifying rear output one and compensating signal that amplitude identical contrary with time delay radiofrequency signal phase place by described signal processing module, whole signal compensation circuit according to described predetermined reference voltage and described amplitude limit control signal achieve generate with the radiofrequency signal phase place that radio-frequency signal source exports on the contrary and the identical compensating signal of amplitude, characteristic curve also can realize Adaptive matching according to different radio-frequency signal sources simultaneously, thus the compensating signal existing for signal compensation circuit solving prior art and provide cannot regulate to realize realizing mating completely with the characteristic curve of radio-frequency signal source automatically, simultaneously also cannot realize the problem of mating with different radio frequency signal source.
Accompanying drawing explanation
Fig. 1 is the function structure chart comprising the signal compensation apparatus of signal compensation circuit provided by the invention;
Fig. 2 is the exemplary circuit structure chart of the signal compensation circuit of signal compensation apparatus provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With the example that is applied as in signal compensation apparatus, the signal compensation circuit that the embodiment of the present invention provides is described below:
Fig. 1 shows the modular structure comprising the signal compensation apparatus of signal compensation circuit provided by the invention, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
Signal compensation apparatus comprises filtration module 100, optical branching device 200, time delay module 300, signal mixer 400 and signal compensation circuit 500; Signal compensation circuit 500 is connected with optical branching device 200 and signal mixer 400, the radiofrequency signal that radio-frequency signal source exports after filtering module 100 filtering and optical branching device exports time delay module 300 and signal compensation circuit 500 to after 200 along separate routes respectively, exports after the time delay radiofrequency signal that time delay module 300 exports by signal mixer 400 and the compensating signal that signal compensation circuit 500 exports carry out mixed processing.
Signal compensation circuit 500 comprises:
Input connects the output of optical branching device 200, and control end access predetermined reference voltage, processes the signal generation module 501 of rear output one first compensating signal contrary with described radiofrequency signal phase place to described radiofrequency signal according to predetermined reference voltage;
The output of input connection signal generation module 501, control end access amplitude limit control signal, the first compensating signal exported by signal generation module 501 according to amplitude limit control signal carries out the amplitude limit control module 502 of amplitude limiting processing;
Input and output are connected output and the signal mixer of amplitude limit control module respectively, export signal processing module 503 that is contrary with described time delay radiofrequency signal phase place and the compensating signal that amplitude is identical after being amplified by described first compensating signal after amplitude limit control module 502 amplitude limiting processing.
Fig. 2 shows the exemplary circuit structure of the signal compensation circuit of signal compensation apparatus provided by the invention, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
As one embodiment of the present invention, signal generation module 501 comprises:
Coupling capacitance C1, backward diode are to D1, resistance R1, resistance R2, coupling capacitance C2 and coupling capacitance C3;
The first end of coupling capacitance C1 is the input of signal generation module 501, backward diode is to second end meeting end 3 butt coupling electric capacity C1 altogether of D1, the first end ground connection of resistance R1, second end of resistance R1 and the first end of coupling capacitance C2 are connected to the cathode terminal 1 of backward diode to D1 altogether, the first end of resistance R2 and the first end of coupling capacitance C3 are connected to the anode tap 2 of backward diode to D1 altogether, second end of resistance R2 is the control end of signal generation module 501, the common contact of second end of coupling capacitance C2 and second end of coupling capacitance C3 is the output of signal generation module 501.Wherein, coupling capacitance C2 and coupling capacitance C3 is for compensating the reactance of backward diode to D1.
As one embodiment of the present invention, amplitude limit control module 502 comprises:
Coupling capacitance C4, resistance R3, in the same way diode pair D2, filter capacitor C5, resistance R4, resistance R5, filter capacitor C6 and diode pair D3 in the same way;
The first end of coupling capacitance C4 is the input of amplitude limit control module 502, second end of coupling capacitance C4 and the first end of resistance R3 are connected to the common cathode extreme 2 of diode pair D2 in the same way altogether, the second end ground connection of resistance R3, the second plate end 3 of diode pair D2 and the first anode end 1 of diode pair D3 are in the same way connected to the first end of resistance R4 altogether in the same way, the common contact of second end of resistance R4 and the first end of filter capacitor C5 is the control end of amplitude limit control module 502, the second end ground connection of filter capacitor C5, the first anode end 1 of diode pair D2 and the second plate end 3 of diode pair D3 are in the same way connected to the first end of resistance R5 altogether in the same way, second end of resistance R5 is connected DC power supply VCC with the common contact of the first end of filter capacitor C6, the second end ground connection of filter capacitor C6, the common cathode of diode pair D3 extreme 2 is the output of amplitude limit control module 502 in the same way.Wherein, coupling capacitance C4 and resistance R3 forms the linear component that RC filter network generates in reflected signal process for eliminating diode pair D2 in the same way; In the same way diode pair D2 and in the same way diode pair D3 Schottky diode can be selected in a particular application to improve amplitude limiting property.
As one embodiment of the present invention, signal processing module 503 comprises:
Radio frequency amplifier A1, inductance L 1 and resistance R6;
The input of radio frequency amplifier A1 and output are respectively input and the output of signal processing module 503, the first end of resistance R6 connects DC power supply VCC, inductance L 1 is connected between second end of resistance R6 and the positive power source terminal of radio frequency amplifier A1, the negative power end ground connection of radio frequency amplifier A1.
In embodiments of the present invention, the resistance of regulating resistance R2, resistance R4, resistance R5 and resistance R6 can play the match parameter regulating whole signal compensation circuit relative to radio-frequency signal source; Regulate predetermined reference voltage and amplitude limit control signal can realize adaptively mating completely with the characteristic of radio-frequency signal source, also can realize coupling according to the difference of radio-frequency signal source simultaneously.
Below in conjunction with operation principle, above-mentioned signal compensation circuit is described further:
The radiofrequency signal exported from optical branching device 200 is coupled into backward diode to D1 by coupling capacitance C1, and predetermined reference voltage regulates backward diode to generate first compensating signal contrary with this radiofrequency signal phase place to the linear condition of D1 to make signal generation module 501 by resistance R2.Subsequently, this first compensating signal enters amplitude limit control module 502 by coupling capacitance C4, and control by resistance R4 diode pair D2 in the same way and diode pair D3 in the same way carry out exporting to after electricity adjusts amplitude limiting processing rear class signal processing module 503 to the first compensating signal by amplitude limit control signal, finally carry out amplifying rear output and the time delay radiofrequency signal phase place that time delay module 300 exports on the contrary and the identical compensating signal of amplitude by radio frequency amplifier A1, then time delay radiofrequency signal and this compensating signal are carried out mixed processing with the nonlinear component in the radiofrequency signal offset radio-frequency signal source and export by signal mixer 400, thus the whole electrical-optical transfer process of signal compensation apparatus is worked in the range of linearity.
The embodiment of the present invention comprises signal generation module by adopting in signal compensation apparatus, the signal compensation circuit of amplitude limit control module and signal processing module, carried out processing rear output one first compensating signal contrary with this radiofrequency signal phase place according to predetermined reference voltage radio frequency signal by signal generation module, according to amplitude limit control signal, this first compensating signal is carried out amplitude limiting processing by amplitude limit control module, and carry out amplifying rear output one and compensating signal that amplitude identical contrary with time delay radiofrequency signal phase place by signal processing module, whole signal compensation circuit according to described predetermined reference voltage and described amplitude limit control signal achieve generate with the radiofrequency signal phase place that radio-frequency signal source exports on the contrary and the identical compensating signal of amplitude, compensating signal is mated completely with the characteristic curve of radio-frequency signal source, also can realize Adaptive matching according to different radio-frequency signal sources simultaneously, thus the compensating signal existing for signal compensation circuit solving prior art and provide cannot regulate to realize realizing mating completely with the characteristic curve of radio-frequency signal source automatically, simultaneously also cannot realize the problem of mating with different radio frequency signal source.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a signal compensation circuit, be connected with optical branching device and signal mixer, the radiofrequency signal that radio-frequency signal source exports after filtering module filtered and described optical branching device along separate routes after export time delay module and described signal compensation circuit respectively to, export after the time delay radiofrequency signal that described time delay module exports by described signal mixer and the compensating signal that described signal compensation circuit exports carry out mixed processing; It is characterized in that, described signal compensation circuit comprises:
Input connects the output of described optical branching device, and control end access predetermined reference voltage, processes the signal generation module of rear output one first compensating signal contrary with described radiofrequency signal phase place to described radiofrequency signal according to described predetermined reference voltage;
Input connects the output of described signal generation module, and control end access amplitude limit control signal, carries out the amplitude limit control module of amplitude limiting processing by described first compensating signal according to described amplitude limit control signal;
Input and output are connected the output of described amplitude limit control module and described signal mixer respectively, export after described first compensating signal after described amplitude limit control module amplitude limiting processing is amplified one with described time delay radiofrequency signal phase place on the contrary and the signal processing module of the identical described compensating signal of amplitude.
2. signal compensation circuit as claimed in claim 1, it is characterized in that, described signal generation module comprises:
Coupling capacitance C1, backward diode are to D1, resistance R1, resistance R2, coupling capacitance C2 and coupling capacitance C3;
The first end of described coupling capacitance C1 is the input of described signal generation module, described backward diode is to second end meeting the described coupling capacitance C1 of end connection altogether of D1, the first end ground connection of described resistance R1, second end of described resistance R1 and the first end of described coupling capacitance C2 are connected to the cathode terminal of described backward diode to D1 altogether, the first end of described resistance R2 and the first end of described coupling capacitance C3 are connected to the anode tap of described backward diode to D1 altogether, second end of described resistance R2 is the control end of described signal generation module, the common contact of second end of described coupling capacitance C2 and second end of described coupling capacitance C3 is the output of described signal generation module.
3. signal compensation circuit as claimed in claim 1, it is characterized in that, described amplitude limit control module comprises:
Coupling capacitance C4, resistance R3, in the same way diode pair D2, filter capacitor C5, resistance R4, resistance R5, filter capacitor C6 and diode pair D3 in the same way;
The first end of described coupling capacitance C4 is the input of described amplitude limit control module, described in second end of described coupling capacitance C4 and the first end of resistance R3 are connected to altogether, the common cathode of diode pair D2 is extreme in the same way, the second end ground connection of described resistance R3, the second plate end of the described D2 of diode pair in the same way and the first anode end of the described D3 of diode pair are in the same way connected to the first end of described resistance R4 altogether, the common contact of second end of described resistance R4 and the first end of described filter capacitor C5 is the control end of described amplitude limit control module, the second end ground connection of described filter capacitor C5, the first anode end of the described D2 of diode pair in the same way and the second plate end of the described D3 of diode pair are in the same way connected to the first end of described resistance R5 altogether, second end of described resistance R5 is connected DC power supply with the common contact of the first end of described filter capacitor C6, the second end ground connection of described filter capacitor C6, the common cathode of the described D3 of diode pair is in the same way extremely the output of described amplitude limit control module.
4. signal compensation circuit as claimed in claim 1, it is characterized in that, described signal processing module comprises:
Radio frequency amplifier A1, inductance L 1 and resistance R6;
The input of described radio frequency amplifier A1 and output are respectively input and the output of described signal processing module, the first end of described resistance R6 connects DC power supply, described inductance L 1 is connected between second end of described resistance R6 and the positive power source terminal of described radio frequency amplifier A1, the negative power end ground connection of described radio frequency amplifier A1.
5. a signal compensation apparatus, it is characterized in that, described signal compensation apparatus comprises filtration module, optical branching device, time delay module, signal mixer and signal compensation circuit, described signal compensation circuit is connected with described optical branching device and described signal mixer, the radiofrequency signal that radio-frequency signal source exports exports described time delay module and described signal compensation circuit respectively to after described filtration module filtering and the shunt of described optical branching device, export after the time delay radiofrequency signal that described time delay module exports by described signal mixer and the compensating signal that described signal compensation circuit exports carry out mixed processing,
Described signal compensation circuit comprises:
Input connects the output of described optical branching device, and control end access predetermined reference voltage, processes the signal generation module of rear output one first compensating signal contrary with described radiofrequency signal phase place to described radiofrequency signal according to described predetermined reference voltage;
Input connects the output of described signal generation module, and control end access amplitude limit control signal, carries out the amplitude limit control module of amplitude limiting processing by described first compensating signal according to described amplitude limit control signal;
Input and output are connected the output of described amplitude limit control module and described signal mixer respectively, export after described first compensating signal after described amplitude limit control module amplitude limiting processing is amplified one with described time delay radiofrequency signal phase place on the contrary and the signal processing module of the identical described compensating signal of amplitude.
6. signal compensation apparatus as claimed in claim 5, it is characterized in that, described signal generation module comprises:
Coupling capacitance C1, backward diode are to D1, resistance R1, resistance R2, coupling capacitance C2 and coupling capacitance C3;
The first end of described coupling capacitance C1 is the input of described signal generation module, described backward diode is to second end meeting the described coupling capacitance C1 of end connection altogether of D1, the first end ground connection of described resistance R1, second end of described resistance R1 and the first end of described coupling capacitance C2 are connected to the cathode terminal of described backward diode to D1 altogether, the first end of described resistance R2 and the first end of described coupling capacitance C3 are connected to the anode tap of described backward diode to D1 altogether, second end of described resistance R2 is the control end of described signal generation module, the common contact of second end of described coupling capacitance C2 and second end of described coupling capacitance C3 is the output of described signal generation module.
7. signal compensation apparatus as claimed in claim 5, it is characterized in that, described amplitude limit control module comprises:
Coupling capacitance C4, resistance R3, in the same way diode pair D2, filter capacitor C5, resistance R4, resistance R5, filter capacitor C6 and diode pair D3 in the same way;
The first end of described coupling capacitance C4 is the input of described amplitude limit control module, described in second end of described coupling capacitance C4 and the first end of resistance R3 are connected to altogether, the common cathode of diode pair D2 is extreme in the same way, the second end ground connection of described resistance R3, the second plate end of the described D2 of diode pair in the same way and the first anode end of the described D3 of diode pair are in the same way connected to the first end of described resistance R4 altogether, the common contact of second end of described resistance R4 and the first end of described filter capacitor C5 is the control end of described amplitude limit control module, the second end ground connection of described filter capacitor C5, the first anode end of the described D2 of diode pair in the same way and the second plate end of the described D3 of diode pair are in the same way connected to the first end of described resistance R5 altogether, second end of described resistance R5 is connected DC power supply with the common contact of the first end of described filter capacitor C6, the second end ground connection of described filter capacitor C6, the common cathode of the described D3 of diode pair is in the same way extremely the output of described amplitude limit control module.
8. signal compensation apparatus as claimed in claim 5, it is characterized in that, described signal processing module comprises:
Radio frequency amplifier A1, inductance L 1 and resistance R6;
The input of described radio frequency amplifier A1 and output are respectively input and the output of described signal processing module, the first end of described resistance R6 connects DC power supply, described inductance L 1 is connected between second end of described resistance R6 and the positive power source terminal of described radio frequency amplifier A1, the negative power end ground connection of described radio frequency amplifier A1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510787579.5A CN105430232A (en) | 2015-11-17 | 2015-11-17 | Signal compensation circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510787579.5A CN105430232A (en) | 2015-11-17 | 2015-11-17 | Signal compensation circuit and device |
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| CN105430232A true CN105430232A (en) | 2016-03-23 |
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| CN201510787579.5A Pending CN105430232A (en) | 2015-11-17 | 2015-11-17 | Signal compensation circuit and device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002158962A (en) * | 2000-11-21 | 2002-05-31 | Hitachi Ltd | Analog signal processing system |
| CN1379958A (en) * | 1999-10-13 | 2002-11-13 | 汤姆森许可公司 | Digital and analog television signal digitization and processing device |
| CN203071942U (en) * | 2013-01-11 | 2013-07-17 | 四川九州电子科技股份有限公司 | Light transmitter and pre-distortion circuit thereof |
-
2015
- 2015-11-17 CN CN201510787579.5A patent/CN105430232A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1379958A (en) * | 1999-10-13 | 2002-11-13 | 汤姆森许可公司 | Digital and analog television signal digitization and processing device |
| JP2002158962A (en) * | 2000-11-21 | 2002-05-31 | Hitachi Ltd | Analog signal processing system |
| CN203071942U (en) * | 2013-01-11 | 2013-07-17 | 四川九州电子科技股份有限公司 | Light transmitter and pre-distortion circuit thereof |
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