CN111384903B - Digital microwave signal regulating circuit - Google Patents
Digital microwave signal regulating circuit Download PDFInfo
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- CN111384903B CN111384903B CN202010289680.9A CN202010289680A CN111384903B CN 111384903 B CN111384903 B CN 111384903B CN 202010289680 A CN202010289680 A CN 202010289680A CN 111384903 B CN111384903 B CN 111384903B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
Abstract
The invention discloses a digital microwave signal regulating circuit, which comprises an input impedance matching module, a baseband transmission modulation module and an output impedance matching module, wherein the input impedance matching module is used for carrying out isolation processing on a digital microwave signal and sending the digital microwave signal into an LC network to carry out impedance matching on the input signal; the phase shift adjusting unit ensures high utilization rate of bandwidth in the modulation process, enables phase shift adjustment to be more accurate and effective, greatly reduces the signal error rate, and finally outputs the signal after output impedance matching processing, so that digital microwave signal transmission is more accurate and reliable.
Description
Technical Field
The invention relates to the technical field of digital microwave communication, in particular to a digital microwave signal regulating circuit.
Background
Digital microwave is a digital wireless transmission system working in a microwave frequency band, and due to the characteristics of microwave transmission and the curved surface characteristics of the earth, a digital microwave line is generally formed by one section, and each section can be regarded as a point-to-point wireless communication system. The purpose of communication by adopting microwave is to transmit information in long distance, digital baseband transmission is a mode of transmitting by using a cable without shifting the frequency spectrum of a digital baseband signal, and a digital baseband signal sequence output by a terminal device or a digital baseband signal after certain code pattern conversion (channel coding). The ground digital microwave networking is unique due to larger information quantity and low construction investment, the information quantity of large-capacity (more than 140 Mb/s) digital microwave communication transmission is very high, and fading caused by multipath transmission from the ground and the atmosphere can cause nonuniformity and distortion in a signal transmission band, so that the utilization rate of the bandwidth of the signal in the modulation process is low, Gaussian noise is strong, and the nonuniformity and the distortion in the transmission band seriously influence the error rate and the transmission reliability.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a digital microwave signal conditioning circuit to overcome the drawbacks of the prior art.
The technical scheme for solving the problem is as follows: a digital microwave signal regulating circuit comprises an input impedance matching module, a baseband transmission modulation module and an output impedance matching module, wherein the input impedance matching module is used for carrying out isolation processing on a digital microwave signal and sending the digital microwave signal into an LC network to carry out impedance matching on an input signal; the baseband transmission modulation module comprises a signal lifting unit and a phase shift adjusting unit, the signal lifting unit comprises an operational amplifier AR2 and an AR3, a non-inverting input end of the operational amplifier AR2 is connected with one end of a resistor R4 and a capacitor C5, an inverting input end of the operational amplifier AR2 is connected with one end of a resistor R2 and one end of a capacitor C6, the other end of the resistor R2 and the other end of the capacitor C5 are connected with an output end of the input impedance matching module and are connected with an output end of the operational amplifier AR2 through a resistor R3, an output end of the operational amplifier AR2 is connected with an emitter of a triode VT 2, the non-inverting input end of the operational amplifier AR2 is connected with a base of the triode VT 2, one end of the capacitor C2 and an inverting input end of the operational amplifier AR2, the non-inverting input end of the operational amplifier AR2 is connected with the other end of the resistor R2 and one end of the resistor R2, the other ends of the resistors R2 and the other ends of the capacitors VT 2 are connected with a ground in parallel, a, the other ends of the capacitors C12 and C13 are grounded; the phase shift adjusting unit comprises a capacitor C8, one end of the capacitor C8 is connected with the non-inverting input end of an operational amplifier AR2 through a resistor R7, the other end of the capacitor C8 is connected with pins 1 and 3 of a rheostat RP1, one end of a resistor R8 and pins 1 and 3 of a rheostat RP2 are connected through a capacitor C9, a pin 2 of the rheostat RP1 is connected with one ends of a resistor R9 and a capacitor C10, a pin 2 of the rheostat RP2 and the other end of the capacitor C10 are grounded, the other end of the resistor R8 is connected with an inverting input end of an operational amplifier AR4, the other end of the resistor R9 is connected with a non-inverting input end of the operational amplifier AR4, the output end of the operational amplifier AR4 is connected with one ends of resistors R11 and R12, the cathode of a diode D1 and the anode of a diode D2, the other end of the resistor R11 is connected with the anode of a diode D1 and the cathode of a diode D1 and is connected with the inverting input end of the operational amplifier AR4, and the other end of the resistor R12 is connected with the output end of an operational amplifier AR 3; and the output impedance matching module is used for performing impedance matching on the output signal of the baseband transmission modulation module and then outputting the output signal.
Preferably, the input impedance matching module includes an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to the digital microwave signal input terminal through a capacitor C1, an inverting input terminal and an output terminal of the operational amplifier AR1 are connected to one ends of an inductor L1 and a capacitor C2, the other end of the capacitor C2 is connected to one ends of a capacitor C3 and an inductor L2, the other ends of the inductor L1 and the capacitor C3 are grounded, the other end of the inductor L2 is connected to a base of a triode Q1, an emitter of the triode Q1 is grounded, a collector of the triode Q1 is connected to a power source VCC through a resistor R1, and is connected to the other ends of a resistor R2 and a capacitor C5 through a.
Preferably, the output impedance matching module includes a capacitor C14, one end of the capacitor C14 is connected to the output end of the operational amplifier AR3, the other end of the capacitor C14 is connected to one end of an inductor L4, a capacitor C15, an adjustable resistor RP3 and the digital microwave signal output end, and the other ends of the inductor L4, the capacitor C15 and the adjustable resistor RP3 are connected to the power VCC and grounded through a capacitor C16.
Through the technical scheme, the invention has the beneficial effects that:
1. the signal lifting unit adopts the operational amplifiers AR2 and AR3 to form differential operational amplifier to lift the digital microwave signal so as to compensate the fading quantity, has good anti-noise effect and anti-attenuation performance, and adds a pi-type LC filter at the feedback end of the operational amplifier AR3 to eliminate EMI interference, effectively inhibits Gaussian noise, and prevents the signal from generating non-uniformity and distortion in the transmission band;
2. the phase shift adjusting unit utilizes the RC phase shift network to realize the phase shift between 0 and pi, the high utilization rate of bandwidth in the modulation process is ensured, the output signal of the RC phase shift network is sent into the operational amplifier AR4 to carry out differential operational amplification, and feedback adjustment is added to obtain a high-quality sine waveform, so that the phase shift adjustment is more accurate and effective, the signal error rate is greatly reduced, and the digital microwave signal transmission is more accurate and reliable.
Drawings
Fig. 1 is a schematic circuit diagram of an input impedance matching module according to the present invention.
Fig. 2 is a schematic circuit diagram of a baseband transmission modulation module and an output impedance matching module according to the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A digital microwave signal conditioning circuit comprises an input impedance matching module, a baseband transmission modulation module and an output impedance matching module. The input impedance matching module is used for isolating the digital microwave signals and sending the isolated digital microwave signals into the LC network to perform impedance matching on the input signals. As shown in fig. 1, the input impedance matching module includes an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to the digital microwave signal input terminal through a capacitor C1, an inverting input terminal and an output terminal of the operational amplifier AR1 are connected to one end of an inductor L1 and one end of a capacitor C2, the other end of the capacitor C2 is connected to one end of a capacitor C3 and one end of an inductor L2, the other ends of the inductor L1 and the capacitor C3 are grounded, the other end of the inductor L2 is connected to a base of a triode Q1, an emitter of the triode Q1 is grounded, a collector of the triode Q1 is connected to a power source VCC through a resistor R1, and is connected to the other ends of a resistor.
In the transmission process of the digital microwave signal, the internal resistance of a signal source of the digital microwave signal is required to be equal to the characteristic impedance of a transmission band in magnitude and have the same phase, so that the input impedance matching module is adopted to perform impedance matching on the digital microwave input signal. The operational amplifier AR1 uses the voltage follower principle to isolate and output the input signal, and forms a good electrical isolation with the outside, and the inductors L1 and L2 and the capacitors C2 and C3 form an LC network to perform impedance matching on the input signal, so that the transmission capacity of the digital microwave signal is improved, and the energy benefit is improved.
The signal is sent to a triode Q1 for preliminary amplification and output after input impedance matching, and is sent to a baseband transmission modulation module after being coupled by a capacitor C4. As shown in fig. 2, the baseband transmission modulation module includes a signal lifting unit and a phase shift adjusting unit, the signal lifting unit includes an operational amplifier AR2 and an operational amplifier AR3, a non-inverting input terminal of the operational amplifier AR2 is connected to one end of a resistor R4 and one end of a capacitor C5, an inverting input terminal of the operational amplifier AR2 is connected to one end of a resistor R2 and one end of a capacitor C6, the other ends of a resistor R2 and a capacitor C5 are connected to an output terminal of the input impedance matching module and to an output terminal of the operational amplifier AR2 through a resistor R3, an output terminal of the operational amplifier AR2 is connected to an emitter of a transistor VT 2, and is connected to a base of the transistor VT 2, one end of the capacitor C2 and the inverting input terminal of the operational amplifier AR2 through a resistor R3, a non-inverting input terminal of the operational amplifier AR2 is connected to the other end of the resistor R2 and one end of the resistor R2, the other ends of the resistors R2 and the other ends of the capacitors VT 2 are connected in parallel to ground, a collector of the, the other ends of the capacitors C12 and C13 are grounded. The operational amplifier AR2 amplifies the output signal of the triode Q1 in a common-mode input mode, the resistors R2 and R3 and the capacitors C5 and C6 form a second-order RC band-pass network in the AR2 operational amplifier process to carry out frequency selection processing on the microwave signal, the anti-noise effect is good, and external interference including surge, fast pulse group, static electricity, voltage drop, voltage change and various electromagnetic fields is effectively avoided. The signals amplified by the operational amplifier AR2 are sent to the AR3 in two paths for differential amplification, so that the system error caused by the amplification process is effectively reduced, and the anti-attenuation performance is good. Because the pulse current and voltage of the switching power supply and the digital equipment have abundant high-frequency harmonics, strong radiation can be generated, and a pi-type LC filter formed by an inductor L3 and capacitors C12 and C13 is added at the feedback end of the operational amplifier AR3 to eliminate EMI interference, so that the suppression capability of Gaussian noise in the signal lifting process is well improved, and signal distortion is avoided.
The phase shift adjusting unit performs phase modulation on a digital microwave signal in the process of signal lifting processing, and comprises a capacitor C8, one end of the capacitor C8 is connected with a non-inverting input end of an operational amplifier AR2 through a resistor R7, the other end of the capacitor C8 is connected with pins 1 and 3 of a rheostat RP1, one end of a resistor R8 and pins 1 and 3 of a rheostat RP2 are connected through a capacitor C9, pin 2 of the rheostat RP1 is connected with one ends of a resistor R9 and a capacitor C10, pin 2 of the rheostat RP2 and the other end of the capacitor C10 are grounded, the other end of the resistor R8 is connected with an inverting input end of the operational amplifier AR4, the other end of the resistor R9 is connected with a non-inverting input end of the operational amplifier AR4 and is grounded through a resistor R10 and a capacitor C10 which are connected in parallel, the output end of the operational amplifier AR 10 is connected with one end of the resistors R10 and the cathode of the diode D10 and the anode of the diode D, The cathode of the D1 is connected with the inverting input end of the operational amplifier AR4, and the other end of the resistor R12 is connected with the output end of the operational amplifier AR 3. The capacitors C8, C9 and C10 and the varistors RP1 and RP2 form an RC phase-shifting network, RC advanced adjustment and RC delayed adjustment can be carried out on digital microwave signals, so that the phase shift between 0-pi is realized, the amplitude of the output voltage of the RC phase-shifting network is equal to that of the input voltage, the amplitude is guaranteed not to change along with the change of frequency and phase, and the high utilization rate of bandwidth in the modulation process is greatly guaranteed. Adjusting the resistance values of the rheostats RP1 and RP2 can change the time constant of the RC phase-shifting network, thereby realizing the phase adjustment of the output voltage of the digital microwave signal. In order to avoid distortion of an output waveform after phase shift adjustment, an output signal of the RC phase shift network is sent to an operational amplifier AR4 for differential operational amplification, the resistor R11 and the diodes D1 and D2 carry out feedback adjustment on the output signal of the operational amplifier AR4, and a negative feedback loop does not contain a nonlinear element, so that a high-quality sinusoidal waveform can be obtained, and the phenomena of waveform burrs, overshooting and ringing are avoided.
The output impedance matching module is used for performing impedance matching on the output signal of the baseband transmission modulation module and then outputting the output signal, so that the characteristic impedance of the transmission line is equal to the magnitude and the phase of the connected load impedance. The output impedance matching module comprises a capacitor C14, one end of the capacitor C14 is connected with the output end of the operational amplifier AR3, the other end of the capacitor C14 is connected with one end of an inductor L4, one end of a capacitor C15 and one end of an adjustable resistor RP3 and the digital microwave signal output end, and the other ends of the inductor L4, the capacitor C15 and the adjustable resistor RP3 are connected with a power supply VCC and are grounded through the capacitor C16.
When the invention is used specifically, the input impedance matching module firstly carries out isolation processing on the digital microwave signal, shields external interference, and then sends the digital microwave signal into the LC network to carry out impedance matching on the input signal, thereby improving the transmission capability of the digital microwave signal. The signal is sent into the triode after being matched with input impedance for preliminary amplification and output, and is sent into the baseband transmission modulation module after being coupled by the capacitor C4, the baseband transmission modulation module comprises a signal lifting unit and a phase shift adjusting unit, the signal lifting unit adopts an operational amplifier AR2 and an AR3 to form differential operational amplifier for lifting the digital microwave signal so as to compensate the fading quantity, the digital microwave signal has good anti-noise effect and anti-attenuation performance, and a pi-type LC filter is added at the feedback end of the operational amplifier AR3 to eliminate EMI interference, effectively inhibit Gaussian noise and prevent the signal from generating nonuniformity and distortion in a transmission band. The phase shift adjusting unit utilizes the RC phase shift network to realize the phase shift between 0 and pi, the high utilization rate of bandwidth in the modulation process is ensured, the output signal of the RC phase shift network is sent into the operational amplifier AR4 to carry out differential operational amplification, and feedback adjustment is added to obtain a high-quality sine waveform, so that the phase shift adjustment is more accurate and effective, the signal error rate is greatly reduced, and finally the output signal is output after output impedance matching processing. The invention has good signal modulation capability, low error rate of digital microwave signal transmission, strong Gaussian noise suppression capability, and improved frequency spectrum and power utilization rate, so that the digital microwave signal transmission is more accurate and reliable.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (3)
1. A digital microwave signal conditioning circuit, includes input impedance matching module, baseband transmission modulation module and output impedance matching module, its characterized in that: the input impedance matching module is used for isolating the digital microwave signals and sending the isolated digital microwave signals into the LC network to perform impedance matching on the input signals;
the baseband transmission modulation module comprises a signal lifting unit and a phase shift adjusting unit, the signal lifting unit comprises an operational amplifier AR2 and an AR3, a non-inverting input end of the operational amplifier AR2 is connected with one end of a resistor R4 and one end of a capacitor C5, an inverting input end of the operational amplifier AR2 is connected with one end of a resistor R2 and one end of a capacitor C6, the other end of the resistor R2 and the other end of the capacitor C5 are connected with an output end of the input impedance matching module and are connected with an output end of the operational amplifier AR2 through a resistor R3, an output end of the operational amplifier AR2 is connected with an emitter of a triode VT 2, the non-inverting input end of the operational amplifier AR2 is connected with a base of the triode VT 2, one end of the capacitor C2 and an inverting input end of the operational amplifier AR2, the non-inverting input end of the operational amplifier AR2 is connected with the other end of the resistor R2 and one end of the resistor R2, the other end of the resistor R2 and the other end of the capacitor VT 2 are connected in parallel to ground, the other ends of the capacitors C12 and C13 are grounded;
the phase shift adjusting unit comprises a capacitor C8, one end of the capacitor C8 is connected with the non-inverting input end of an operational amplifier AR2 through a resistor R7, the other end of the capacitor C8 is connected with pins 1 and 3 of a rheostat RP1, one end of a resistor R8 and pins 1 and 3 of a rheostat RP2 are connected through a capacitor C9, a pin 2 of the rheostat RP1 is connected with one ends of a resistor R9 and a capacitor C10, a pin 2 of the rheostat RP2 and the other end of the capacitor C10 are grounded, the other end of the resistor R8 is connected with an inverting input end of an operational amplifier AR4, the other end of the resistor R9 is connected with a non-inverting input end of the operational amplifier AR4, the output end of the operational amplifier AR4 is connected with one ends of resistors R11 and R12, the cathode of a diode D1 and the anode of a diode D2, the other end of the resistor R11 is connected with the anode of a diode D1 and the cathode of a diode D1 and is connected with the inverting input end of the operational amplifier AR4, and the other end of the resistor R12 is connected with the output end of an operational amplifier AR 3;
and the output impedance matching module is used for performing impedance matching on the output signal of the baseband transmission modulation module and then outputting the output signal.
2. The digital microwave signal conditioning circuit of claim 1, wherein: the input impedance matching module comprises an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with the digital microwave signal input end through a capacitor C1, the inverting input end and the output end of the operational amplifier AR1 are connected with one end of an inductor L1 and one end of a capacitor C2, the other end of the capacitor C2 is connected with one end of a capacitor C3 and one end of an inductor L2, the other ends of an inductor L1 and a capacitor C3 are grounded, the other end of the inductor L2 is connected with the base of a triode Q1, the emitter of the triode Q1 is grounded, the collector of the triode Q1 is connected with a power supply VCC through a resistor R1, and is connected with the other ends of a resistor R2 and.
3. The digital microwave signal conditioning circuit of claim 1 or 2, characterized in that: the output impedance matching module comprises a capacitor C14, one end of the capacitor C14 is connected with the output end of the operational amplifier AR3, the other end of the capacitor C14 is connected with one end of an inductor L4, one end of a capacitor C15, one end of an adjustable resistor RP3 and the digital microwave signal output end, and the other ends of the inductor L4, the capacitor C15 and the adjustable resistor RP3 are connected with a power supply VCC and are grounded through the capacitor C16.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010289680.9A CN111384903B (en) | 2020-04-14 | 2020-04-14 | Digital microwave signal regulating circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010289680.9A CN111384903B (en) | 2020-04-14 | 2020-04-14 | Digital microwave signal regulating circuit |
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| CN111384903A CN111384903A (en) | 2020-07-07 |
| CN111384903B true CN111384903B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108494418B (en) * | 2018-03-09 | 2020-08-28 | 瑞安市虹宇科技有限公司 | Big data signal calibration circuit |
| US10432242B1 (en) * | 2018-05-09 | 2019-10-01 | Morse Micro Pty Ltd | Low noise broadband amplifier with resistive matching |
| CN109379309B (en) * | 2018-12-07 | 2023-07-07 | 华兴通信技术有限公司 | Integrated digital microwave predistortion circuit |
| CN209105210U (en) * | 2018-12-07 | 2019-07-12 | 河南华兴通信技术有限公司 | Integrated digital microwave predistortion circuit |
| CN109412634A (en) * | 2018-12-07 | 2019-03-01 | 河南华兴通信技术有限公司 | Integrated digital microwave system |
| CN109302150A (en) * | 2018-12-07 | 2019-02-01 | 河南华兴通信技术有限公司 | A kind of 10W Multi-Carrier Power Amplifier in 5G system base-station |
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Address after: Room 3208, block a, Yunfeng block, window of Greenland, No.80, Puhui Road, Zhengzhou area (Zhengdong), Zhengzhou pilot Free Trade Zone, Henan Province Patentee after: Huaxing Communication Technology Co., Ltd Address before: Room 3204, block a, Yunfeng block, window of Greenland, No.80, Puhui Road, Zhengzhou area (Zhengdong), Zhengzhou pilot Free Trade Zone, Henan Province Patentee before: HENAN HUAXING COMMUNICATION TECHNOLOGY Co.,Ltd. |