CN116320329B - Integrated chip of optical fiber access terminal system - Google Patents
Integrated chip of optical fiber access terminal system Download PDFInfo
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- CN116320329B CN116320329B CN202310518094.0A CN202310518094A CN116320329B CN 116320329 B CN116320329 B CN 116320329B CN 202310518094 A CN202310518094 A CN 202310518094A CN 116320329 B CN116320329 B CN 116320329B
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- digital
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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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
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides an integrated chip of an optical fiber access terminal system, which comprises: analog-to-digital mixing circuits, digital circuits, and radio frequency circuits; the analog-digital mixing circuit is connected with the digital circuit and sends an output voltage signal to the digital circuit; the digital circuit is connected with the radio frequency circuit. The BiCMOS technology is adopted, the radio frequency circuit, the digital circuit and the analog-digital mixed circuit are integrated on a single chip, the integrated chip scheme of the optical fiber access terminal system is realized, about one third of chip area is saved compared with the existing optimal two-chip scheme, the overall cost is reduced, and the application complexity is simplified.
Description
Technical Field
The invention relates to the field of optical fiber coaxial cable networks, in particular to an integrated chip of an optical fiber access terminal system.
Background
Cable television networks are typically Hybrid Fiber Coax (HFC) networks, in which optical signals in optical fibers are required to be photoelectrically converted into electrical signals in a terminal device accessed by a user side optical fiber, and the electrical signals are processed and then decoded by a set top box or a television. In the optical fiber access terminal device, the most important component is a signal processing and control chip, except for the photodiode. Because the transmission signal of the cable television is a radio frequency signal, the signal processing part in the optical access terminal is a radio frequency circuit, the control circuit is a digital circuit, and the interface of the radio frequency and the control circuit is an analog-digital hybrid circuit. In the prior art, the radio frequency circuit is composed of one or more chips, and completes the radio frequency signal processing work. The digital circuit and the analog-digital hybrid circuit are formed by another chip. The prior art scheme mainly has the following three defects:
first, the whole scheme needs two or more chips to form, and the design is complicated, and the application difficulty is high.
Secondly, the radio frequency circuit, the digital circuit and the analog-digital mixed circuit in the prior art are completed by different production processes, the different process differences are large, the control algorithm is difficult to adjust in real time according to the differences caused by the production of different radio frequency circuits, the control precision is low, and the consistency of the whole scheme is poor.
Third, the existing multi-chip scheme is high in cost and power consumption.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a fiber optic access terminal system integrated chip that overcomes or at least partially solves the above problems.
According to one aspect of the present invention, there is provided an optical access terminal system integrated chip, the integrated chip comprising:
analog-to-digital mixing circuits, digital circuits, and radio frequency circuits;
the analog-digital mixing circuit is connected with the digital circuit and sends an output voltage signal to the digital circuit;
the digital circuit is connected with the radio frequency circuit.
Optionally, the analog-digital mixing circuit specifically includes:
the photoelectric conversion of the photoelectric conversion diode is followed by taking the voltage signal converted by the optical fiber;
the output passes through an analog-to-digital conversion interface.
Optionally, the digital circuit specifically includes: CPU, memory, PWM controller, bus control, timer/timer, interrupt controller, UART/I2C communication interface;
acquiring a voltage signal of the analog-digital hybrid circuit, and storing the voltage signal in a RAM memory by a CPU;
reading a program in the ROM, and controlling the attenuation of the pressure control attenuator in the radio frequency circuit according to the corresponding relation between the amplitude of the analog-to-digital conversion sampling signal and the PWM signal so that the amplitude of the finally output radio frequency signal is kept unchanged;
the optional function of the user, if the UART/I2C communication requirement is met, generating an interrupt in the interrupt controller and processing a communication program;
after the process is completed, the main program execution is re-entered.
Optionally, the radio frequency circuit includes:
the optical signal is accessed from the optical fiber and is changed into an original radio frequency signal after photoelectric conversion of the photoelectric conversion diode;
entering a transimpedance amplifier to amplify the first stage to become a first-stage signal;
the first-stage signal passes through a voltage-controlled attenuator, and the attenuation of the voltage-controlled attenuator is controlled by a PWM signal output by a digital circuit;
the difference of the attenuation amount depends on the magnitude of the PWM signal output by the digital circuit;
the first-stage signal is attenuated by an attenuator to become a second-stage signal; and amplifying the output final constant radio frequency signal by an amplifier.
The invention provides an integrated chip of an optical fiber access terminal system, which comprises: analog-to-digital mixing circuits, digital circuits, and radio frequency circuits; the analog-digital mixing circuit is connected with the digital circuit and sends an output voltage signal to the digital circuit; the digital circuit is connected with the radio frequency circuit. The BiCMOS technology is adopted, the radio frequency circuit, the digital circuit and the analog-digital mixed circuit are integrated on a single chip, the integrated chip scheme of the optical fiber access terminal system is realized, about one third of chip area is saved compared with the existing optimal two chip scheme (radio frequency chip and digital control chip), the overall cost is reduced, and the application complexity is simplified.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an integrated chip of an optical fiber access terminal system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terms "comprising" and "having" and any variations thereof in the description embodiments of the invention and in the claims and drawings are intended to cover a non-exclusive inclusion, such as a series of steps or elements.
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples.
As shown in fig. 1, the present invention proposes an integrated chip using a BiCMOS process system. The Bipolar transistor (Bipolar) process and the CMOS process are integrated in the BiCMOS process, so that a single-chip scheme is easy to realize. The triode technology is suitable for designing radio frequency circuits, the CMOS technology is suitable for designing digital circuits and analog-digital mixed circuits, and finally, a scheme of integrating a single chip of the system can be realized, and about one third of chip area is saved compared with the existing optimal two-chip scheme (radio frequency chip and digital control chip), so that the overall cost is reduced, and the application complexity is simplified.
The invention provides a schematic block diagram of an integrated chip of an optical fiber access terminal system, which comprises the following steps:
the working principle of the scheme provided by the invention is as follows:
analog-to-digital mixing circuit: the photoelectric conversion of the photoelectric conversion diode is followed by the voltage signal converted by the optical fiber, and then the voltage signal enters the digital circuit through the analog-to-digital conversion interface.
Digital circuit: the voltage signal of the digital-analog hybrid circuit is obtained, and the CPU stores the voltage signal in the RAM memory. Meanwhile, a program in the ROM is read, and the attenuation of the pressure control attenuator in the radio frequency circuit is controlled according to the corresponding relation between the amplitude of the analog-digital conversion sampling signal and the magnitude of the PWM signal, so that the amplitude of the finally output radio frequency signal is kept unchanged. Finally, the optional function of the user is that if the UART/I2C communication requirement exists, an interrupt is generated in the interrupt control to process the communication program. After the process is completed, the main program execution is re-entered.
And the radio frequency circuit is used for enabling the optical signal to be accessed from the optical fiber and changed into an original radio frequency signal after photoelectric conversion of the photoelectric conversion diode. Then enters a transimpedance amplifier to carry out first-stage amplification to become a first-stage signal. The first-stage signal passes through a voltage-controlled attenuator, and the attenuation of the voltage-controlled attenuator is controlled by the PWM signal output by the digital circuit. The amount of attenuation varies depending on the magnitude of the PWM signal output by the digital circuit. The first stage signal is attenuated by the attenuator to become a second stage signal. And finally amplifying and outputting a final constant radio frequency signal through an output amplifier.
The invention is internally provided with a control program, and can realize the output of constant radio frequency signals.
No programming is required by those skilled in the art of using the present invention. The present invention has built in a control program.
By using the invention, the technical field personnel do not need to debug the gain of the amplifier and the control precision of the PWM output by the singlechip, and the built-in program of the invention is already debugged before leaving the factory.
When the technical field of the invention is used for designing the PCB layout, the positions of the two chips (the amplifier and the singlechip) are not required to be reserved, and the single chip can save the space of the PCB.
Due to the advantages of 1-3 3, the development period and the test period are shortened, the space of the PCB is saved, and the research and development cost is saved.
The working principle of the control algorithm of the invention is described with reference to a practical application case. Table 1 is a table of the correspondence between input optical power and attenuation, for a typical optical access application, the input optical power varies from-10 dBm to +2dBm, the Attenuation (ATT) of the voltage controlled attenuator in the RF circuit varies from 0dB to 24dB, and the RF output voltage is kept constant at 78dBuV (the specific RF output voltage is customized according to the specific application standard).
In this practical application, the analog-to-digital hybrid circuit samples a voltage signal of 0.64V to the digital circuit when the input optical power is at-2 dBm. The hexadecimal system is processed by the digital circuit and then converted to 0x36A. After the digital circuit receives the signal of 0x36A, the digital circuit inquires from a table, and when the attenuation of the voltage-controlled attenuator is 16dB, the constant 78dBuv of radio frequency output can be ensured. The output PWM of the program control digital circuit is 0x147A, the voltage of the attenuator is 1.60V, the attenuation of 16dB is generated by the attenuator, and the radio frequency output voltage is kept constant at 78dBuv.
When the optical power is from-10 dBm to +2dBm, the program adjusts PWM to give corresponding voltage to the attenuator when the analog optical power is at-2 dBm, so as to adjust the attenuation of the attenuator and keep the output of the radio frequency circuit constant.
The corresponding relation table of the input optical power and the attenuation amount can be generated according to the radio frequency output voltage required by specific application, and can be calibrated when the chip is applied for the first time, errors caused by process differences among different chips can be eliminated, and the consistency and control precision of the chips are improved.
TABLE 1 correspondence control Table of input optical power and attenuation
The beneficial effects are that: the BiCMOS technology is adopted, the radio frequency circuit, the digital circuit and the analog-digital mixed circuit are integrated on a single chip, the integrated chip scheme of the optical fiber access terminal system is realized, and about one third of chip area is saved compared with the existing optimal two chip scheme (radio frequency chip and digital control chip), so that the overall cost is reduced, and the application complexity is simplified. Meanwhile, the built-in control algorithm can be calibrated when the chip is applied for the first time, so that errors caused by process differences among different chips are eliminated, and the consistency and control precision of the chips are improved.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, and it should be understood that the invention is not limited to the particular embodiments disclosed, but is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the invention.
Claims (3)
1. An integrated chip for a fiber optic access terminal system, the integrated chip comprising:
analog-to-digital mixing circuits, digital circuits, and radio frequency circuits;
the analog-digital mixing circuit is connected with the digital circuit and sends an output voltage signal to the digital circuit;
the digital circuit is connected with the radio frequency circuit;
the digital circuit specifically comprises: CPU, memory, PWM controller, bus control, timer/timer, interrupt controller, UART/I2C communication interface;
acquiring a voltage signal of the analog-digital hybrid circuit, and storing the voltage signal in a RAM memory by a CPU;
reading a program in the ROM, and controlling the attenuation of the pressure control attenuator in the radio frequency circuit according to the corresponding relation between the amplitude of the analog-to-digital conversion sampling signal and the PWM signal so that the amplitude of the finally output radio frequency signal is kept unchanged;
the optional function of the user, if the UART/I2C communication requirement exists, the interrupt controller generates interrupt and processes the communication program;
after the process is completed, the main program execution is re-entered.
2. The integrated chip of claim 1, wherein the analog-to-digital hybrid circuit specifically comprises:
the photoelectric conversion of the photoelectric conversion diode is followed by taking the voltage signal converted by the optical fiber;
the output passes through an analog-to-digital conversion interface.
3. The integrated chip of claim 1, wherein the radio frequency circuit comprises:
the optical signal is accessed from the optical fiber and is changed into an original radio frequency signal after photoelectric conversion of the photoelectric conversion diode;
entering a transimpedance amplifier to amplify the first stage to become a first-stage signal;
the first-stage signal passes through a voltage-controlled attenuator, and the attenuation of the voltage-controlled attenuator is controlled by a PWM signal output by a digital circuit;
the difference of the attenuation amount depends on the magnitude of the PWM signal output by the digital circuit;
the first-stage signal is attenuated by an attenuator to become a second-stage signal; and amplifying the output final constant radio frequency signal by an amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310518094.0A CN116320329B (en) | 2023-05-10 | 2023-05-10 | Integrated chip of optical fiber access terminal system |
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| CN202310518094.0A CN116320329B (en) | 2023-05-10 | 2023-05-10 | Integrated chip of optical fiber access terminal system |
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| CN116320329A CN116320329A (en) | 2023-06-23 |
| CN116320329B true CN116320329B (en) | 2023-09-15 |
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Citations (6)
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| US4015213A (en) * | 1975-02-24 | 1977-03-29 | Sony Corporation | Pulse width modulated signal amplifier |
| CN2711992Y (en) * | 2004-06-18 | 2005-07-20 | 武汉盛华微系统技术有限公司 | Intelligent RF optical transmission module |
| WO2007065328A1 (en) * | 2005-12-08 | 2007-06-14 | Wuhan Winningchina Microsystem Technologies Co., Ltd. | A rf optical transmit device and a control method |
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| CN213937900U (en) * | 2020-12-28 | 2021-08-10 | 南方电网数字电网研究院有限公司 | Narrow-band wireless communication module for 230MHz |
| CN114696843A (en) * | 2022-04-28 | 2022-07-01 | 厦门芯迈微电子有限公司 | Ultra-wideband radio frequency front end module |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8258480B2 (en) * | 2008-03-03 | 2012-09-04 | The Board Of Trustees Of The Leland Stanford Junior University | High energy photon detection using pulse width modulation |
| WO2009114738A2 (en) * | 2008-03-12 | 2009-09-17 | Hypres, Inc. | Digital radio-frequency tranceiver system and method |
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2023
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Patent Citations (6)
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| US4015213A (en) * | 1975-02-24 | 1977-03-29 | Sony Corporation | Pulse width modulated signal amplifier |
| CN2711992Y (en) * | 2004-06-18 | 2005-07-20 | 武汉盛华微系统技术有限公司 | Intelligent RF optical transmission module |
| WO2007065328A1 (en) * | 2005-12-08 | 2007-06-14 | Wuhan Winningchina Microsystem Technologies Co., Ltd. | A rf optical transmit device and a control method |
| CN111193553A (en) * | 2020-03-04 | 2020-05-22 | 中国电子科技集团公司第三十四研究所 | Light path insertion loss self-adaptive radio frequency optical receiver |
| CN213937900U (en) * | 2020-12-28 | 2021-08-10 | 南方电网数字电网研究院有限公司 | Narrow-band wireless communication module for 230MHz |
| CN114696843A (en) * | 2022-04-28 | 2022-07-01 | 厦门芯迈微电子有限公司 | Ultra-wideband radio frequency front end module |
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| CN116320329A (en) | 2023-06-23 |
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