CN203788284U - Apparatus controlling radio frequency gain - Google Patents
Apparatus controlling radio frequency gain Download PDFInfo
- Publication number
- CN203788284U CN203788284U CN201420127085.5U CN201420127085U CN203788284U CN 203788284 U CN203788284 U CN 203788284U CN 201420127085 U CN201420127085 U CN 201420127085U CN 203788284 U CN203788284 U CN 203788284U
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- control
- gain
- signal
- chip microprocessor
- attenuator
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Abstract
The utility model provides an apparatus which uses an optical signal to automatically control a radio frequency gain. The apparatus comprises a photoelectric converter (1), a low noise amplifier (2), an automatic gain control circuit, a single-chip microprocessor, an operational amplifier (10), a communication interface (11) and a remote control interface (12). The automatic gain control circuit comprises a digital control attenuator (6) and a logic control interface (14). An output terminal of the photoelectric converter (1) is connected with an input terminal of the low noise amplifier (2). An output terminal of the low noise amplifier (2) is connected to an input terminal of the digital control attenuator (6). The single-chip microprocessor, the logic control interface (14) and the digital control attenuator (6) are connected sequentially. The communication interface (11) and the remote control interface (12) are connected to the single-chip microprocessor respectively. The structure is simple, usage is convenient, cost is low, precision is high, a frequency band is wide, an optical signal control scope is large, reliability is high, stability is good and remote communication and remote control can be realized.
Description
Technical field
The utility model relates to rf gain control technology, relates in particular to the device of automatically controlling rf gain in hfc plant, CATV transmission system with light signal.
Background technology
Rf gain control device of the prior art, adopts following four schemes to realize at present:
As shown in Figure 1, scheme one is in RF radio-frequency channel, design an attenuator slot, when needs are adjusted gain, blade inserting attenuator 3 is replaced, during displacement, manually generally can carry the blade inserting attenuator 3 of various gradients in 0dB ~ 20dB, according to on-the-spot situation, in a plurality of blade inserting attenuators 3, select suitable plugging, the precision of debugging is not high like this, and with more attenuator also very waste, and manual adjustments is pretty troublesome.
As shown in Figure 2, scheme two is in RF radio-frequency channel, design a voltage-controlled attenuator 4, an and adjustable potentiometer 5, when needs adjustment gains, by adjusting adjustable potentiometer 5, output dc voltage, directly adjusts voltage-controlled attenuator 4, and what the voltage-controlled attenuator 4 in this scheme adopted is PIN diode design, when user need to export high level, diode can produce linear distortion, deteriorated to the generation of RF radiofrequency signal, affects user watched effect, this scheme is also manual adjustments, and efficiency is slow.
As shown in Figure 3, scheme three is in RF radio-frequency channel, design a numerical-control attenuator 6, and complete machine adds common chip microprocessor 8, digital display tube 9 and controls button 7, when needs are adjusted rf gain, pass through button operation, by chip microprocessor 8, controlled the value of numerical-control attenuator 6, wherein, the effect of digital display tube 9 is to detect to debug how many values, it is larger that this scheme is applicable to device housings, complete machine structure coordinates rationally, and PCB cloth board space is larger, the scene that cost control is not tight, being manual control, is not automatic control yet.
As shown in Figure 4, scheme four is to combine scheme two and scheme three, direct voltage carries out voltage transitions output through adjustable potentiometer 5, the operating state of the change in voltage scope control numerical-control attenuator 6 that common chip microprocessor 8 is come according to input, make the level of output more accurate, but this scheme is also to regulate manually planting with first three, does not realize telecommunication and remote control.
In view of the defect of above four schemes, need to design a kind of device of especially automatically controlling rf gain with light signal.
Utility model content
(1) technical problem that will solve
Deficiency for several schemes conventional in prior art, need to design a kind of device that can automatically control rf gain, and can carry out telecommunication and remote control.
(2) technical scheme
In order to achieve the above object, the utility model provides a kind of device of automatically controlling rf gain with light signal, it comprises optical-electrical converter 1, low noise amplifier 2, automatic gain control circuit, chip microprocessor, operational amplifier 10, communication interface 11 and Remote Control Interface 12, automatic gain control circuit comprises numerical-control attenuator 6 and logic control interface 14, the output of optical-electrical converter 1 is connected with the input of low noise amplifier 2, the output of low noise amplifier 2 is connected with the input of numerical-control attenuator 6, chip microprocessor, logic control interface 14 is connected with numerical-control attenuator 6 orders, communication interface 11, Remote Control Interface 12 is connected with chip microprocessor respectively.
Wherein, chip microprocessor is common chip microprocessor 8, and optical-electrical converter 1, operational amplifier 10 and common chip microprocessor 8 orders are connected.
Or chip microprocessor is high-precision single microprocessor 13, optical-electrical converter 1 is directly connected with high-precision single microprocessor 13.
Wherein, numerical-control attenuator 6 at least comprises five ports: RF input, RF output and three signal ports: enable latch signal (Load Enable, abbreviation LE) port, data-signal (DATA) port and clock signal (CLOCK is called for short CLK) port.
Wherein, three of numerical-control attenuator 6 signal port: LE, DATA, CLK are connected with logic control interface 14 respectively.
Wherein, optical-electrical converter 1 input incoming light signal.
Wherein, numerical-control attenuator 6 output radiofrequency signals.
(3) beneficial effect
What the utility model provided controls the device of rf gain automatically with light signal, and beneficial effect is:
A. solved in prior art scheme one when user carries out field adjustable and carried various blade inserting attenuators, caused the low problem of blade inserting attenuator utilance, and realized automatic ride gain function;
B. this programme adopts numerical-control attenuator can guarantee the nonlinear indicator of RF radiofrequency signal, avoids occurring the situation of distortion, and has realized automatic ride gain function;
C. solved the time-consuming problem that in scheme three and scheme four, manual adjustments voltage brings, can automatically allow device control rf gain;
The utility model is by automatically controlling rf gain with light signal input, simple in structure, easy to operate, cost is low, precision is high, bandwidth, light signal control range large (9dBm to+3dBm), reliability are high, good stability, and can realize telecommunication and Remote, the radiofrequency signal of output is more accurate, and the signal receiving is more clear.
Accompanying drawing explanation
Fig. 1 is the structure chart that the rf gain of scheme one in prior art is controlled;
Fig. 2 is the structure chart that the rf gain of scheme two in prior art is controlled;
Fig. 3 is the structure chart that the rf gain of scheme three in prior art is controlled;
Fig. 4 is the structure chart that the rf gain of scheme four in prior art is controlled;
Fig. 5 is the structure chart that the light signal of the utility model embodiment 1 is controlled rf gain device automatically;
Fig. 6 is the structure chart that the light signal of the utility model embodiment 2 is controlled rf gain device automatically.
Wherein, 1: optical-electrical converter; 2: low noise amplifier; 3: blade inserting attenuator; 4: voltage-controlled attenuator; 5: adjustable potentiometer; 6: numerical-control attenuator; 7: control button; 8: common chip microprocessor; 9: digital display tube; 10: operational amplifier; 11: communication interface; 12: Remote Control Interface; 13: high-precision single microprocessor; 14: logic control interface.
Embodiment
The device of light signal of the present utility model being controlled to rf gain below in conjunction with accompanying drawing is described in further details.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
In description of the present utility model, it should be noted that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand the concrete meaning of above-mentioned term in the utility model.
In addition,, in description of the present utility model, except as otherwise noted, the implication of " a plurality of " is two or more.
As Fig. 5, shown in 6, light signal of the present utility model is controlled rf gain device, comprise optical-electrical converter 1, low noise amplifier 2, automatic gain control circuit, chip microprocessor, operational amplifier 10, communication interface 11 and Remote Control Interface 12, automatic gain control circuit comprises numerical-control attenuator 6 and logic control interface 14, the output of optical-electrical converter 1 is connected with the input of low noise amplifier 2, the output of low noise amplifier 2 is connected with the input of numerical-control attenuator 6, chip microprocessor, logic control interface 14 is connected with numerical-control attenuator 6 orders, communication interface 11, Remote Control Interface 12 is connected with chip microprocessor respectively.
The effect of optical-electrical converter 1 is that light signal is transformed into the signal of telecommunication, and the signal of telecommunication after conversion is divided into two-way, and a road is rf broadband signal, and a road is d. c. voltage signal; Optical-electrical converter 1, operational amplifier 10 and common chip microprocessor 8 orders are connected.
The effect of chip microprocessor is to control the operating state that is attached thereto parts.
Low noise amplifier 2 is amplifiers that noise factor is very low, in the occasion of amplifying small-signal, the noise of amplifier self may be very serious to the interference of signal, so select low noise amplifier, its effect is that the faint rf broadband signal of optical-electrical converter 1 conversion is amplified.
The effect of numerical-control attenuator 6 is sizes of signal in Circuit tuning, prevents load circuit overload, and output level is kept within the specific limits; Numerical-control attenuator 6 at least comprises five ports, respectively RF input, RF output and three signal ports, three signal ports are respectively to enable latch signal (Load Enable, abbreviation LE) port, data-signal (DATA) port and clock signal (CLOCK, be called for short CLK) port, described three signal ports are connected with logic control interface 14 respectively, in order to control the level of numerical-control attenuator 6.
The effect of operational amplifier 10 is to process direct voltage, and direct voltage is calculated and amplifies and send in common chip microprocessor 8.
Communication interface 11, Remote Control Interface 12 are connected with the corresponding interface of chip microprocessor respectively, can observe from afar the situation of rf gain, and carry out telecommunication and Remote.
Chip microprocessor can be common chip microprocessor, can be also high-precision single microprocessor.
embodiment 1
As shown in Figure 5, for light signal of the present utility model is controlled rf gain device automatically, it comprises optical-electrical converter 1, low noise amplifier 2, automatic gain control circuit, operational amplifier 10, common chip microprocessor 8, communication interface 11 and Remote Control Interface 12, automatic gain control circuit comprises numerical-control attenuator 6 and logic control interface 14, the output of optical-electrical converter 1 respectively with low noise amplifier 2, the input of operational amplifier 10 is connected, the output of low noise amplifier 2 is connected with the input of numerical-control attenuator 6, the output of operational amplifier 10 is connected with the input of common chip microprocessor 8, common chip microprocessor 8, logic control interface 14 is connected with numerical-control attenuator 6 orders, communication interface 11, Remote Control Interface 12 is connected with common chip microprocessor 8 respectively.
It is as follows that the light signal of embodiment 1 is controlled the rf gain device course of work automatically: optical signal power scope is-9dBm ~+3dBm, after being become to the signal of telecommunication, light signal input optical-electrical converter 1 in this power bracket is divided into two-way, one tunnel is rf broadband signal, one tunnel is d. c. voltage signal, rf broadband signal enters low noise amplifier 2 and amplifies, jitter after amplification, need numerical-control attenuator 6 to adjust, d. c. voltage signal enters operational amplifier 10 simultaneously, after calculating amplification, enter again common chip microprocessor 8, common chip microprocessor 8 converts power to the signal after amplifying, according to the size of input power, by logic control interface, gone to control the scope of the level value of numerical-control attenuator 6, from the radiofrequency signal of numerical-control attenuator output, be a more stable radiofrequency signal like this, how the external equipment connecting from communication interface 11 changes if can observing rf gain, if occur abnormal, can also carry out Remote by Remote Control Interface 12, adjust the light signal size of input.
embodiment 2
As shown in Figure 6, for light signal of the present utility model is controlled rf gain device automatically, it comprises optical-electrical converter 1, low noise amplifier 2, automatic gain control circuit, high-precision single microprocessor 13, communication interface 11 and Remote Control Interface 12, automatic gain control circuit comprises numerical-control attenuator 6 and logic control interface 14, the output of optical-electrical converter 1 respectively with low noise amplifier 2, the input of high-precision single microprocessor 13 is connected, the output of low noise amplifier 2 is connected with the input of numerical-control attenuator 6, high-precision single microprocessor 13, logic control interface 14 is connected with numerical-control attenuator 6 orders, communication interface 11, Remote Control Interface 12 is connected with high-precision single microprocessor 13 respectively.
It is as follows that the light signal of embodiment 2 is controlled the rf gain device course of work automatically: optical signal power scope is-9dBm ~+3dBm, after being become to the signal of telecommunication, light signal input optical-electrical converter 1 in this power bracket is divided into two-way, one tunnel is rf broadband signal, one tunnel is d. c. voltage signal, rf broadband signal enters low noise amplifier 2 and amplifies, jitter after amplification, need numerical-control attenuator 6 to adjust, d. c. voltage signal enters high-precision single microprocessor 13 simultaneously, high-precision single microprocessor 13 amplifies d. c. voltage signal, after calculating, convert power to, according to the size of input power, by logic control interface 14, gone to control the scope of the level value of numerical-control attenuator 6, from the radiofrequency signal of numerical-control attenuator 6 outputs, are more stable radiofrequency signals like this, how the external equipment connecting by communication interface 11 changes if can observing rf gain, if occur abnormal, also can carry out Remote by Remote Control Interface 12, adjust the light signal size of input.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection range of the present utility model.
Claims (7)
1. a device of automatically controlling rf gain with light signal, it is characterized in that: comprise optical-electrical converter (1), low noise amplifier (2), automatic gain control circuit, chip microprocessor, operational amplifier (10), communication interface (11) and Remote Control Interface (12), automatic gain control circuit comprises numerical-control attenuator (6) and logic control interface (14), the output of optical-electrical converter (1) is connected with the input of low noise amplifier (2), the output of low noise amplifier (2) is connected with the input of numerical-control attenuator (6), chip microprocessor, logic control interface (14) is connected with numerical-control attenuator (6) order, communication interface (11), Remote Control Interface (12) is connected with chip microprocessor respectively.
2. the device of automatically controlling rf gain with light signal as claimed in claim 1, it is characterized in that: chip microprocessor is common chip microprocessor (8), optical-electrical converter (1), operational amplifier (10) and common chip microprocessor (8) order are connected.
3. the device of automatically controlling rf gain with light signal as claimed in claim 1, is characterized in that: chip microprocessor is high-precision single microprocessor (13), and optical-electrical converter (1) is directly connected with high-precision single microprocessor (13).
4. the device of automatically controlling rf gain with light signal as claimed in claim 1, is characterized in that: numerical-control attenuator (6) at least comprises five ports: RF input, RF output and three signal ports: enable latch signal port, data-signal port and clock signal port.
5. the device of automatically controlling rf gain with light signal as claimed in claim 4, is characterized in that: three signal ports of numerical-control attenuator (6) are connected with logic control interface (14) respectively.
6. as described in any one in claim 1-5, with light signal, automatically control the device of rf gain, it is characterized in that: optical-electrical converter (1) input incoming light signal.
7. as described in any one in claim 1-5, with light signal, automatically control the device of rf gain, it is characterized in that: numerical-control attenuator (6) output radiofrequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420127085.5U CN203788284U (en) | 2014-03-20 | 2014-03-20 | Apparatus controlling radio frequency gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420127085.5U CN203788284U (en) | 2014-03-20 | 2014-03-20 | Apparatus controlling radio frequency gain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203788284U true CN203788284U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420127085.5U Expired - Fee Related CN203788284U (en) | 2014-03-20 | 2014-03-20 | Apparatus controlling radio frequency gain |
Country Status (1)
| Country | Link |
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| CN (1) | CN203788284U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108319199A (en) * | 2018-02-08 | 2018-07-24 | 成都芯通科技股份有限公司 | A kind of rf attenuation inserted sheet equivalent attenuation control circuit |
| CN109030900A (en) * | 2018-06-28 | 2018-12-18 | 宁波环球广电科技有限公司 | CATV blade inserting fixed attenuator identification circuit |
-
2014
- 2014-03-20 CN CN201420127085.5U patent/CN203788284U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108319199A (en) * | 2018-02-08 | 2018-07-24 | 成都芯通科技股份有限公司 | A kind of rf attenuation inserted sheet equivalent attenuation control circuit |
| CN108319199B (en) * | 2018-02-08 | 2024-03-15 | 成都芯通软件有限公司 | Equivalent attenuation control circuit of radio frequency attenuation inserting sheet |
| CN109030900A (en) * | 2018-06-28 | 2018-12-18 | 宁波环球广电科技有限公司 | CATV blade inserting fixed attenuator identification circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20190320 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |