CN202334441U - Controllable attenuation predistortion circuit - Google Patents
Controllable attenuation predistortion circuit Download PDFInfo
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- CN202334441U CN202334441U CN2011205113489U CN201120511348U CN202334441U CN 202334441 U CN202334441 U CN 202334441U CN 2011205113489 U CN2011205113489 U CN 2011205113489U CN 201120511348 U CN201120511348 U CN 201120511348U CN 202334441 U CN202334441 U CN 202334441U
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- attenuator
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- directional coupler
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Abstract
The utility model discloses a controllable attenuation predistortion circuit, which comprises directed couplers, a voltage control radio frequency (RF) attenuator, an RF amplifier, a phase converter, an amplitude equalizer and a phase micro adjuster, and is characterized in that: the circuit connection is that: an RF signal enters the directed coupler T3 and is connected with the voltage control RF attenuator through a capacitor C12 and then connected with the RF amplifier U1 through a capacitor C13; the RF amplifier U1 is connected with the phase converter T4 through a capacitor C14 and then connected with a diode D2 to produce a nonlinear distortion signal; the distortion signal is connected with the amplitude equalizer and the phase micro adjuster DL1 to form an RF signal auxiliary path; the other path of main channel signal is connected with a main channel RF time delay line DL2 through the directed coupler T3 and finally connected with the directed coupler T2; a central processing unit (CPU) U2 controls the attenuation of RF energy of the auxiliary path according to the output voltage so as to control RF signal amplitude in the diode; and an aim of controlling a nonlinear distortion amount of the whole system is fulfilled.
Description
Technical field
The utility model relates to a kind of predistortion circuit, but particularly discloses a kind of controlling attenuation predistortion circuit, belongs to components and parts electronic circuit technology field, is applied to optical transmission system.
Background technology
In the Optical CATV Transmission System, there is the following aspects in the source of nonlinear distortion: (1) laser unintentional nonlinearity; (2) laser P-I curve is non-linear; (3) laser is owing to existing threshold current to produce non-linear that clipping distortion causes; What (4) optical fiber dispersion and reflection brought is non-linear; What (5) photo-detector and preamplifier caused is non-linear.In the optical-fiber network of reality, after the typing of optical fiber and laser, the amount of nonlinearity of whole system derives from optical fiber, and length of fiber is its main determining factor.
Along with the integration of 1550nm technology in the continuous maturation, particularly cable network of hfc plant, the transformation of network develops towards the direction that bi-directional data, long distance, large tracts of land cover, and city, county, the three grades of cable television network networkings in township have become inexorable trend.Lay in the process of optical-fiber network in reality, because actual conditions are complicated and changeable, have nothing in common with each other to the distance in county such as each city, the non-linear distortion volume of whole system is also just inequality, thereby can improve higher requirement to optical transmission device.
Summary of the invention
The purpose of the utility model is to solve the problems of the prior art, but a kind of controlling attenuation predistortion circuit is provided, and in actual networking, can the parameter of the different non-linear distortion volumes of coupling be set, thereby reach allocation optimum according to the optical fiber of different length.
But the utility model is achieved in that a kind of controlling attenuation predistortion circuit; The voltage-controlled RF attenuator that comprises directional coupler T3, forms by D3, D4 and U2, RF amplifier U1, phase converter T4, diode D2, the amplitude equalizer, phase place inching device DL1, directional coupler T2, laser impedance matching box T1 and the main road delay line DL2 that mainly form by R5 and R6; The circuit connection that it is characterized in that circuit is: radiofrequency signal is introduced into directional coupler T3; Connect mainly the voltage-controlled RF attenuator of forming by D3 and D4 and U2 through the 12 capacitor C 12; Voltage-controlled RF attenuator connects a RF amplifier U1 through the 13 capacitor C 13; The one RF amplifier connects phase converter T4 through the 14 capacitor C 14; Connect diode D2 again and produce the nonlinear distortion signal, distorted signal connects the amplitude equalizer and the phase place inching device DL1 that mainly are made up of R5 and R6 and carries out amplitude and phase place adjustment, has constituted the bypass of radiofrequency signal; Another road main channel signal connects main road radio frequency delay line DL2 through directional coupler T3, connects directional coupler T2 at last; CPU U2 is through the decay of output voltage control bypass RF energy, and then the RF signal amplitude of control entering diode, reaches the purpose of control whole system non-linear distortion volume.
The beneficial effect of the utility model is: radiofrequency signal gets into the laser match circuit through main road through directional coupler and delay line, gets into laser then.The bypass that radiofrequency signal is passed through, owing to adopted microprocessor LPC2200 to control the control voltage of voltage-controlled RF attenuator, and then accurately control the amplitude of bypass radiofrequency signal, so just can go to change the attenuation of radio circuit according to actual external variable.Just through change getting into the energy size of diode, and then the size of the amount of nonlinearity that produces of control diode, the amount distortion of system is compensated.So, in networking, can be according to actual conditions, adjustment gets into the RF signal amplitude of diode, thereby improves the nonlinear distortion index of final light net, reaches optimum efficiency.
Description of drawings
Fig. 1 is the utility model block diagram.
Fig. 2 is the utility model circuit diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further specified.
According to attaching Fig. 1 and 2; But the circuit of the utility model controlling attenuation predistortion circuit connects: radiofrequency signal is introduced into directional coupler T3; Connect voltage-controlled RF attenuator (forming) through the 12 capacitor C 12 by D3, D4 and subsidiary component thereof; Voltage-controlled RF attenuator connects a RF amplifier U1 through the 13 capacitor C 13, and a RF amplifier connects phase converter T4 through the 14 capacitor C 14, connects diode D2 again and produces the nonlinear distortion signal.Distorted signal connects amplitude equalizer (being made up of R5, R6 etc.) and phase place inching device DL1 carries out amplitude and phase place adjustment, and this has constituted bypass.Another road signal connects main road delay line DL2 through directional coupler T3, connects directional coupler T2 at last, has constituted main road.The control voltage of CPU U2 can be controlled the attenuation of attenuator, thereby control gets into the RF signal amplitude of diode, finally reaches the purpose of control non-linear distortion volume.
The operation principle of the utility model is such: radiofrequency signal gets into directional coupler T3; Connect voltage-controlled RF attenuator through the 12 electric capacity, voltage-controlled RF attenuator is made up of D3, D4 and subsidiary component thereof, and used core devices D1, D2 are the PIN diode HSMP-3814 of Agilent company; The characteristic of this diode is equivalent to the resistance of Current Control; Promptly change the electric current through diode, the high-frequency resistance of diode has bigger variation, when the electric current through this diode during from 10mA to 0.01mA; Its high-frequency resistance changes to thousands of ohm from several ohm, and impedance variations and change in current relation almost are linear.Therefore utilize the peripheral resistance capacitance components and parts of it and some can constitute a voltage-controlled variable attenuator.Microprocessor LPC2200 can control the control voltage of voltage-controlled RF attenuator, and then accurately controls the amplitude of bypass radiofrequency signal.Radiofrequency signal from voltage-controlled attenuator get into amplification module (U1, TAT7461) after, gain gets into the nonlinear distortion signal that diode D3 produces certain amplitude after amplifying 16dB.Distorted signal carries out amplitude and phase place adjustment through amplitude equalizer (being made up of R5, R6 etc.) and phase place inching device DL1.Another road bypass signal connects main road delay line DL2 through directional coupler T3, connects directional coupler T2 at last, has constituted bypass.Main path signal gets into directional coupler T2 from main road delay line DL2 to be mixed with the bypass signal, and mixed signal gets into laser through match circuit (T1 and attached components and parts).
The control voltage of CPU U2 can be controlled the attenuation of voltage-controlled attenuator, and is big or small through changing the RF energy that gets into diode, and then the size of the amount of nonlinearity of control diode generation, thereby the non-linear distortion volume of system is compensated.So, in networking, can be according to actual conditions, adjustment gets into the RF signal amplitude of diode, thereby improves the nonlinear distortion index of final light net, reaches optimum efficiency.In practical application, according to length of fiber in the networking, the voltage output of control MCU, thereby the non-linear distortion volume of easy adjustment and control whole system.
Claims (1)
1. but controlling attenuation predistortion circuit; The voltage-controlled RF attenuator that comprises directional coupler T3, forms by D3, D4 and U2, RF amplifier U1, phase converter T4, diode D2, the amplitude equalizer, phase place inching device DL1, directional coupler T2, laser impedance matching box T1 and the main road delay line DL2 that mainly form by R5 and R6; The circuit connection that it is characterized in that circuit is: radiofrequency signal is introduced into directional coupler T3; Connect mainly the voltage-controlled RF attenuator of forming by D3 and D4 and U2 through the 12 capacitor C 12; Voltage-controlled RF attenuator connects a RF amplifier U1 through the 13 capacitor C 13; The one RF amplifier connects phase converter T4 through the 14 capacitor C 14; Connect diode D2 again and produce the nonlinear distortion signal, distorted signal connects the amplitude equalizer and the phase place inching device DL1 that mainly are made up of R5 and R6 and carries out amplitude and phase place adjustment, has constituted the bypass of radiofrequency signal; Another road main channel signal connects main road radio frequency delay line DL2 through directional coupler T3, connects directional coupler T2 at last; CPU U2 is through the decay of output voltage control bypass RF energy, and then the RF signal amplitude of control entering diode, reaches the purpose of control whole system non-linear distortion volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205113489U CN202334441U (en) | 2011-12-09 | 2011-12-09 | Controllable attenuation predistortion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205113489U CN202334441U (en) | 2011-12-09 | 2011-12-09 | Controllable attenuation predistortion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202334441U true CN202334441U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205113489U Expired - Lifetime CN202334441U (en) | 2011-12-09 | 2011-12-09 | Controllable attenuation predistortion circuit |
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| Country | Link |
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| CN (1) | CN202334441U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324770A (en) * | 2015-06-18 | 2017-01-11 | 珠海思开达技术有限公司 | Hot-pluggable analog light emitting module based on XFP |
| CN106788289A (en) * | 2016-11-30 | 2017-05-31 | 东南大学 | A kind of predistortion circuit and method of ROF lasers |
| CN107070414A (en) * | 2017-03-02 | 2017-08-18 | 广州程星通信科技有限公司 | One kind digitlization pre-distortion linearizer |
| CN107733371A (en) * | 2017-10-26 | 2018-02-23 | 成都西井科技有限公司 | The voltage-controlled attenuator circuit of highly attenuating value |
-
2011
- 2011-12-09 CN CN2011205113489U patent/CN202334441U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324770A (en) * | 2015-06-18 | 2017-01-11 | 珠海思开达技术有限公司 | Hot-pluggable analog light emitting module based on XFP |
| CN106324770B (en) * | 2015-06-18 | 2017-11-10 | 珠海思开达技术有限公司 | A kind of simulated light hair module hot-swappable based on XFP |
| CN106788289A (en) * | 2016-11-30 | 2017-05-31 | 东南大学 | A kind of predistortion circuit and method of ROF lasers |
| CN106788289B (en) * | 2016-11-30 | 2019-04-30 | 东南大学 | A kind of predistortion circuit and method of ROF laser |
| CN107070414A (en) * | 2017-03-02 | 2017-08-18 | 广州程星通信科技有限公司 | One kind digitlization pre-distortion linearizer |
| CN107733371A (en) * | 2017-10-26 | 2018-02-23 | 成都西井科技有限公司 | The voltage-controlled attenuator circuit of highly attenuating value |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ASIA TELCO (SHANGHAI) CO., LTD. Free format text: FORMER NAME: ASIATECLCO TECHNOLOGIES (SHANGHAI) CO. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai city 201204 289 Lane 8, Room 301 Patentee after: Deming communications (Shanghai) Limited by Share Ltd Address before: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai city 201204 289 Lane 8, Room 301 Patentee before: AsiaTeclco Technologies (Shanghai) Co. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |