CN113300776B - Circuit and method for improving top-adjusting sensitivity - Google Patents
Circuit and method for improving top-adjusting sensitivity Download PDFInfo
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- CN113300776B CN113300776B CN202110479455.6A CN202110479455A CN113300776B CN 113300776 B CN113300776 B CN 113300776B CN 202110479455 A CN202110479455 A CN 202110479455A CN 113300776 B CN113300776 B CN 113300776B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a circuit for improving the sensitivity of top adjustment, which comprises a receiving end RSSI voltage sampling circuit and a receiving end RSSI voltage amplifying circuit, wherein the receiving end RSSI voltage sampling circuit comprises a ROSA optical module which converts an optical signal into a current signal and outputs the current signal through an RSSI pin, and an MCU chip which collects an RSSI voltage value, the receiving end RSSI voltage amplifying circuit comprises an operational amplifier chip, the RSSI pin of the ROSA optical module is electrically connected with an RSSI sampling interface of the MCU chip, the RSSI pin of the ROSA optical module is electrically connected with an input pin of the operational amplifier chip, and an output pin of the operational amplifier chip is electrically connected with an RSSI _ AMP sampling interface of the MCU chip through an RC filter circuit. The invention also provides a method for improving the sensitivity of the top adjustment.
Description
Technical Field
The invention relates to the field of top adjustment, in particular to a circuit and a method for improving the sensitivity of top adjustment.
Background
With the development of 5G technology, a large number of color light modules are applied to the AAU (base station active antenna unit) and DU (base station controller distributed unit) sides. The AAU side is built outdoors, and a large amount of cost is needed if maintenance is needed, so that a top adjusting technology is derived. And sending a top-adjusting signal loaded in the normal optical signal through the DU side module to acquire the information of the AAU side module or control the AAU side module. With the increase of link budget, the requirement of the top-adjusting sensitivity is more strict, and how to improve the top-adjusting sensitivity becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circuit and a method for improving the sensitivity of the set top so as to ensure that a set top signal can be still accurately identified when the received light is of smaller optical power, improve the sensitivity of the set top and at least solve part of problems in the prior art.
The invention is realized by the following steps:
the invention provides a circuit for improving the sensitivity of top adjustment, which comprises a receiving end RSSI voltage sampling circuit and a receiving end RSSI voltage amplifying circuit, wherein the receiving end RSSI voltage sampling circuit comprises a ROSA optical module which converts an optical signal into a current signal and outputs the current signal through an RSSI pin, and an MCU chip which collects an RSSI voltage value, the receiving end RSSI voltage amplifying circuit comprises an operational amplifier chip, the RSSI pin of the ROSA optical module is electrically connected with an RSSI sampling interface of the MCU chip, the RSSI pin of the ROSA optical module is electrically connected with an input pin of the operational amplifier chip, and an output pin of the operational amplifier chip is electrically connected with an RSSI _ AMP sampling interface of the MCU chip through an RC filter circuit.
Preferably, an RSSI pin of the ROSA optical module is connected to an input end of a resistor R26, a resistance of the resistor R26 is zero, an output end of the resistor R26 is electrically connected to an RSSI sampling interface of the MCU chip, an output end of the resistor R26 is grounded to GND through a capacitor C41, and a voltage dividing resistor R27 is connected in parallel to the capacitor C41.
Preferably, a chip power supply pin of the operational amplifier chip is electrically connected with a power supply VCCD, and the chip power supply pin of the operational amplifier chip is grounded to GND through a capacitor C13.
Preferably, the RC filter circuit includes a resistor R14 and a capacitor C14, an output pin of the operational amplifier chip is electrically connected to an input terminal of the resistor R14, an output terminal of the resistor R14 is electrically connected to an RSSI _ AMP sampling interface of the MCU chip, and an output terminal of the resistor R14 is grounded through the capacitor C14.
Preferably, the MCU chip is a DS4835 MCU chip.
Preferably, the operational amplifier chip is a MAX44281U integrated operational amplifier chip.
The invention provides a method for improving the sensitivity of the set-top, when receiving light, the RSSI voltage is reduced, the amplified RSSI voltage is larger than the bottom noise by using the RSSI voltage amplifying circuit of the receiving end, so as to judge the high and low level of the set-top signal and receive the set-top signal sent by the opposite end,
when receiving light, the RSSI output voltage of the ROSA optical module is unchanged, the MCU chip samples the RSSI _ AMP voltage obtained by amplifying the RSSI voltage by 10 times, the RSSI _ AMP voltage is larger than bottom noise, and the MCU chip can still accurately receive a top-modulated signal sent from an opposite end when receiving light.
Preferably, the method for improving the sensitivity of the set-top also includes a method for switching the sampling pin by the MCU chip under different optical powers: s1, when the RSSI sampling interface of the MCU chip is used for collecting the RSSI voltage value, if the RSSI voltage is less than 0.15V, the MCU chip switches the ADC value which is collected by the RSSI _ AMP sampling interface and amplified by 10 times to carry out received light power reporting calculation and decision demodulation of a tune-up signal; if the RSSI voltage is more than 0.15V, continuing to use the unamplified ADC value acquired by the RSSI sampling interface to carry out receiving optical power reporting calculation and decision demodulation of the set-top signal;
s2, when the RSSI _ AMP sampling interface of the MCU chip is used for collecting the RSSI voltage value, if the RSSI voltage is more than 2V, the MCU chip switches the unamplified ADC value collected by the RSSI sampling interface to carry out receiving optical power reporting calculation and decision demodulation of a set-top signal; and if the RSSI voltage is less than 2V, continuing to use the amplified 10-time ADC value acquired by the RSSI _ AMP sampling interface of the MCU chip to carry out received light power reporting calculation and decision demodulation of the set-top signal.
The invention has the following beneficial effects:
when the received optical power is small, the converted photocurrent is amplified by the operational amplifier IC, so that correct top-tuning signals can be well demodulated by level judgment, and judgment errors when the photocurrent is smaller than the bottom noise are avoided. The invention can better solve the problem of inaccurate judgment of the top-adjusting signal in small light, and improves the sensitivity of top-adjusting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a receiving end RSSI voltage sampling circuit provided in an embodiment of the present invention;
fig. 2 is an MCU chip adopted by the receiving end RSSI voltage sampling circuit according to the embodiment of the present invention;
fig. 3 is a diagram of a receiving end RSSI voltage amplifying circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to fig. 3, a circuit for improving the sensitivity of a set-top box according to an embodiment of the present invention includes a receiving end RSSI voltage sampling circuit and a receiving end RSSI voltage amplifying circuit, where the receiving end RSSI voltage sampling circuit includes a ROSA optical module for converting an optical signal into a current signal and outputting the current signal through an RSSI pin, and an MCU chip for collecting an RSSI voltage value, a comparator in the MCU chip determines a high level and a low level of the set-top box signal according to an RSSI voltage, the receiving end RSSI voltage amplifying circuit includes an operational amplifier chip, in this embodiment, the MCU chip is a DS4835 MCU chip, the operational amplifier chip is an MAX44281U integrated operational amplifier chip, an RSSI pin of the ROSA optical module is electrically connected to an RSSI sampling interface (a GP25 pin) of the DS4835 MCU chip, an RSSI pin of the ROSA optical module is electrically connected to an input pin (a 1 pin) of a MAX44281U operational amplifier chip, and an output pin (B2 pin) of the MAX44281U operational amplifier chip is electrically connected to an RSSI sampling interface (GP 26) of a DS4835 MCU chip through an RC filter circuit A pin) is electrically connected.
The RSSI pin of the ROSA optical module is connected with the input end of a resistor R26, the resistance value of a resistor R26 is zero, the output end of the resistor R26 is electrically connected with the RSSI sampling interface (GP 25 pin) of the DS4835 MCU chip, the output end of the resistor R26 is grounded GND through a capacitor C41, a voltage dividing resistor R27 is connected with the capacitor C41 in parallel, and the capacitor C41 plays a role in filtering.
The chip power supply pin (pin A2) of the MAX44281U operational amplifier chip is electrically connected with a power supply VCCD, and the chip power supply pin (pin A2) of the MAX44281U operational amplifier chip is grounded GNDT through a capacitor C13. The RC filter circuit comprises a resistor R14 and a capacitor C14, an output pin (a pin B2) of the MAX44281U operational amplifier chip is electrically connected with an input end of the resistor R14, an output end of the resistor R14 is electrically connected with an RSSI _ AMP sampling interface (a pin GP 26) of the MCU chip, and an output end of the resistor R14 is grounded GNDT through the capacitor C14.
The second embodiment of the present invention provides a method for improving the sensitivity of the set-top, when receiving light is small, the RSSI voltage is also reduced, so that the normal RSSI voltage is much larger than the background noise, so as to normally determine the high and low levels of the set-top signal and receive the set-top signal sent from the opposite terminal,
when the received light is small, the RSSI output voltage of the ROSA optical module is unchanged, the MCU chip samples the RSSI _ AMP voltage obtained by amplifying the RSSI voltage by 10 times, the RSSI _ AMP voltage is far greater than the bottom noise, and the MCU chip can still accurately receive a set-top signal sent from the opposite end when the received light is small.
The method for improving the sensitivity of the top-adjusting also comprises a method for switching a sampling pin by the MCU chip under different optical powers: s1, when an RSSI sampling interface (GP 25 pin) of the MCU chip is used for collecting the RSSI voltage value, if the RSSI voltage is less than 0.15V, the MCU chip switches an ADC value (RSSI _ AMP signal) collected by the RSSI _ AMP sampling interface (GP 26 pin) and amplified by 10 times to carry out receiving optical power reporting calculation and decision demodulation of a set top signal; if the RSSI voltage is more than 0.15V, the unamplified ADC value acquired by an RSSI sampling interface (GP 25 pin) is continuously used for carrying out receiving optical power reporting calculation and decision demodulation of a set-top signal;
s2, when an RSSI _ AMP sampling interface (GP 26 pin) of the MCU chip is used for collecting an RSSI voltage value, if the RSSI voltage is more than 2V, the MCU chip switches an unamplified ADC value collected by the RSSI sampling interface (GP 25 pin) to carry out received light power reporting calculation and decision demodulation of a tune-to-tune signal; and if the RSSI voltage is less than 2V, continuing to use an ADC value (RSSI _ AMP signal) acquired by an RSSI _ AMP sampling interface (GP 26 pin) of the MCU chip after amplification by 10 times to carry out received light power reporting calculation and decision demodulation of a set top signal.
The invention solves the problem that the pilot tone signal can still be accurately identified when the received light is of smaller optical power. When the receiving light is small, the RSSI voltage output by the module receiving end is amplified to the MCU by utilizing an operational amplifier IC to judge and identify the top-adjusting signal, so that the top-adjusting signal can be accurately identified and analyzed when the receiving light is small, namely, the top-adjusting sensitivity is improved.
The invention adopts MAXIM MAX44281U 10 times integrated operational amplifier chip, MAXIM DS4835 MCU chip, and module receiving end RSSI sampling circuit and amplifying circuit. The function of improving the sensitivity of the top adjustment is well realized, and the test result shows that the sensitivity of the top adjustment can reach < -30 dBm.
The invention comprises four aspects of a receiving end RSSI voltage sampling circuit principle, a receiving end RSSI voltage amplifying circuit principle, a different optical power switching sampling pin principle and a principle of improving the sensitivity of top regulation.
Receiving end RSSI voltage sampling circuit principle:
the module receiving end can convert the optical signal into a current signal after receiving the light and output the current signal through the RSSI pin. As can be seen from fig. 1-2, the RSSI pin of the receiving terminal (optical module ROSA) is divided into two paths after passing through a 0 ohm resistor (R26), one path is connected to the GP25 pin of the DS4835 chip, and the other path is connected to GND through a capacitor C41 and a resistor R27. The capacitor C41 is only used for filtering, and reduces the noise of the RSSI voltage. Resistance R27 is divider resistance, makes things convenient for DS4835 chip to gather the output voltage of receiving end RSSI pin. The RSSI voltage is used for receiving the optical power and reporting and carrying out high and low level judgment, and the received set top signal is analyzed.
Receiving end RSSI voltage amplification circuit principle:
it can be seen from fig. 3 that the voltage output from the RSSI pin of the optical module ROSA enters through the a1 pin of the MAX44281U chip and is output from the B2 pin of the MAX44281U chip. The A2 pin of the MAX44281U chip is used for connecting the chip power supply pin with VCCD, and simultaneously a 0.1uF capacitor (capacitor C13) is connected to GND for filtering the chip power supply. The pin B1 of the MAX44281U chip is directly connected to GND. The amplified RSSI voltage passes through an RC filter circuit (resistor R14 and capacitor C14) to filter out noise possibly generated by the MAX44281U chip itself, and obtain a clean RSSI _ AMP signal amplified by 10 times. As can be seen in FIG. 2, the RSSI _ AMP signal is coupled to GP26 pin of the DS4835 chip.
Different optical power switching sampling pin principles:
the module collects the RSSI voltage values while using the GP25 pin of DS 4835. If the RSSI voltage is less than 0.15V, the module automatically uses an ADC value (RSSI _ AMP signal) acquired by a GP26 pin and amplified by 10 times to carry out receiving optical power reporting calculation and decision demodulation of a tune-to-tune signal; if the RSSI voltage is more than 0.15V, the unamplified ADC value collected by the GP25 pin is continuously used for receiving optical power reporting calculation and decision demodulation of a tuning signal.
The module collects the RSSI voltage values while using the GP26 pin of DS 4835. If the RSSI voltage is more than 2V, the module automatically uses an unamplified ADC value acquired by a GP25 pin to carry out receiving optical power reporting calculation and decision demodulation of a tune-to-tune signal; if the RSSI voltage is less than 2V, the ADC value (RSSI _ AMP signal) which is acquired by the GP26 pin and is amplified by 10 times is continuously used for carrying out receiving optical power reporting calculation and decision demodulation of the tuning signal.
The hysteresis of 1.85V exists in the switching between the two pins, so that the problem of repeatedly switching the sampling pin at a certain receiving optical power does not exist.
The principle of improving the sensitivity of roof-adjusting:
when the received light is small, the RSSI voltage is also reduced. If the signal is not amplified, the difference between the bottom noise and the normal RSSI voltage amplitude is not large when the top-tuning signal is judged, so that the comparator of the DS4835 chip is easy to have misjudgment when the high and low levels of the top-tuning signal are judged according to the RSSI voltage. And only when the normal RSSI voltage is far more than the bottom noise, the high and low levels can be normally judged so as to receive the top-modulated signal sent by the opposite terminal. This approach requires a particularly high receive responsivity if it is required to meet a-18 dBm tune-to-sensitivity.
By using the method, when the received light is small, the RSSI output voltage of the receiving end of the module is unchanged, the module can sample by using the RSSI _ AMP voltage obtained by amplifying the RSSI voltage by 10 times, and the RSSI _ AMP voltage at the moment is far larger than the background noise. Therefore, the set-top signal sent by the opposite terminal can be accurately received when the received light is small. The sensitivity of the top adjustment can be less than-30 dBm.
The invention comprises an operational amplifier IC peripheral circuit, a module receiving end RSSI sampling circuit and a selection method of sampling modes when different receiving optical powers are switched.
The above-mentioned selection method of sampling mode when the operational amplifier IC/MCU/RSSI sampling circuit/RSSI amplifying circuit/switching different receiving optical powers of the present invention is not intended to limit the present invention, and any equivalent substitution or transformation made on the basis of the principle of the present invention, such as selection of similar operational amplifier IC/MCU/RSSI sampling circuit/RSSI amplifying circuit of other manufacturers/selection method of sampling mode when switching different receiving optical powers, should be included in the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A circuit for improving the sensitivity of top adjustment is characterized in that: including receiving terminal RSSI voltage sampling circuit and receiving terminal RSSI voltage amplifier circuit, receiving terminal RSSI voltage sampling circuit includes the ROSA optical module that converts light signal into current signal and export through the RSSI pin and gathers the MCU chip of RSSI voltage value, receiving terminal RSSI voltage amplifier circuit includes the fortune chip of putting, the RSSI pin of ROSA optical module is connected with the RSSI sampling interface electricity of MCU chip, the RSSI pin of ROSA optical module is connected with the input pin electricity of fortune chip of putting, the output pin of fortune chip of putting passes through RC filter circuit and the RSSI _ AMP sampling interface electricity of MCU chip and is connected.
2. The circuit for improving sensitivity to tune top as recited in claim 1 wherein: the RSSI pin of the ROSA optical module is connected with the input end of a resistor R26, the resistance of a resistor R26 is zero, the output end of the resistor R26 is electrically connected with the RSSI sampling interface of the MCU chip, the output end of the resistor R26 is grounded GND through a capacitor C41, and a divider resistor R27 is connected with the capacitor C41 in parallel.
3. The circuit for improving sensitivity to tune top as recited in claim 1 wherein: the chip power supply pin of the operational amplifier chip is electrically connected with a power supply VCCD, and the chip power supply pin of the operational amplifier chip is grounded GND through a capacitor C13.
4. The circuit for improving sensitivity to tune top as recited in claim 1 wherein: the RC filter circuit comprises a resistor R14 and a capacitor C14, an output pin of the operational amplifier chip is electrically connected with an input end of a resistor R14, an output end of the resistor R14 is electrically connected with an RSSI _ AMP sampling interface of the MCU chip, and an output end of the resistor R14 is grounded through a capacitor C14.
5. The circuit for improving sensitivity to tune top as recited in claim 1 wherein: the MCU chip is a DS4835 MCU chip.
6. The circuit for improving sensitivity to tune top as recited in claim 1 wherein: the operational amplifier chip is an MAX44281U integrated operational amplifier chip.
7. A method for improving the sensitivity of top adjustment is characterized in that: the circuit for improving the sensitivity of the set-top box as claimed in any one of claims 1 to 6, when receiving light, the RSSI voltage is reduced, the RSSI voltage after amplification is larger than the bottom noise by the RSSI voltage amplifying circuit at the receiving end, so as to judge the high and low levels of the set-top signal and receive the set-top signal sent from the opposite end,
when receiving light, the RSSI output voltage of the ROSA optical module is unchanged, the MCU chip samples the RSSI _ AMP voltage obtained by amplifying the RSSI voltage by 10 times, the RSSI _ AMP voltage is larger than the bottom noise, and the MCU chip can still accurately receive a top-modulated signal sent from an opposite terminal when receiving light.
8. The method of increasing sensitivity to tune top as claimed in claim 7 wherein: the method for switching the sampling pin by the MCU chip under different light powers is also included: s1, when the RSSI voltage value is collected by the RSSI sampling interface of the MCU chip, if the RSSI voltage is less than 0.15V, the MCU chip switches the ADC value which is collected by the RSSI _ AMP sampling interface and amplified by 10 times to carry out received light power reporting calculation and decision demodulation of a set-top signal; if the RSSI voltage is more than 0.15V, continuing to use the unamplified ADC value acquired by the RSSI sampling interface to carry out receiving optical power reporting calculation and decision demodulation of the set-top signal;
s2, when the RSSI _ AMP sampling interface of the MCU chip is used for collecting the RSSI voltage value, if the RSSI voltage is more than 2V, the MCU chip switches the unamplified ADC value collected by the RSSI sampling interface to carry out receiving optical power reporting calculation and decision demodulation of a set-top signal; and if the RSSI voltage is less than 2V, continuing to use the amplified 10-time ADC value acquired by the RSSI _ AMP sampling interface of the MCU chip to carry out received light power reporting calculation and decision demodulation of the set-top signal.
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| CN113783622B (en) * | 2021-09-10 | 2023-01-17 | 武汉意谷光电科技有限公司 | Optical module with top adjusting function |
| CN115173955B (en) * | 2022-06-09 | 2023-05-12 | 烽火通信科技股份有限公司 | Demodulation method and device for optical path roof-adjusting signal |
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| CN203554442U (en) * | 2013-10-22 | 2014-04-16 | 青岛海信宽带多媒体技术有限公司 | RSSI monitoring circuit |
| CN111970053A (en) * | 2020-08-11 | 2020-11-20 | 瑞泰(威海)电子科技有限公司 | Demodulation device for top modulation signal and optical module |
| CN112564817A (en) * | 2020-11-19 | 2021-03-26 | 江苏科大亨芯半导体技术有限公司 | Optical modulation receiver topology circuit |
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| US7493053B2 (en) * | 2004-09-30 | 2009-02-17 | Intel Corporation | Mechanism to select bandwidth in an optical receiver circuit |
| CN111371498B (en) * | 2020-03-11 | 2021-02-19 | 东莞铭普光磁股份有限公司 | Optical module signal processing method and device, optical module and readable storage medium |
| CN112564810B (en) * | 2020-11-26 | 2022-04-19 | 江苏科大亨芯半导体技术有限公司 | Set-top transmitter circuit and set-top signal transmission method |
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|---|---|---|---|---|
| CN203554442U (en) * | 2013-10-22 | 2014-04-16 | 青岛海信宽带多媒体技术有限公司 | RSSI monitoring circuit |
| CN111970053A (en) * | 2020-08-11 | 2020-11-20 | 瑞泰(威海)电子科技有限公司 | Demodulation device for top modulation signal and optical module |
| CN112564817A (en) * | 2020-11-19 | 2021-03-26 | 江苏科大亨芯半导体技术有限公司 | Optical modulation receiver topology circuit |
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