A wideband fine step adjustable amplitude equalization system

Abstract

This invention discloses a broadband fine-step adjustable amplitude equalization system, comprising an input terminal, an output terminal, an adjustable amplitude unit, a control unit, and a feedback network. An external broadband input signal is input to the amplitude equalization system through the input terminal and split into two groups of signals. One group of signals is output from the output terminal through the adjustable amplitude unit, and the other group is input to the control unit through the feedback network. The output terminal inputs the amplitude of the output signal to the control unit via the feedback network. The control unit inputs the DAC voltage to the adjustable equalization unit. This invention can achieve high-precision, fine-step amplitude adjustment over a wide bandwidth, effectively compensating for amplitude distortion during signal transmission. It has a simple structure, is easy to integrate, and is suitable for various broadband communication systems; it improves signal transmission quality and enhances the overall performance of the communication system.

Description

Technical Field

[0001] This invention relates to the field of communication technology, specifically to a broadband fine-step adjustable amplitude equalization system. Background Technology

[0002] In modern communication systems, signals are affected by various factors during transmission, leading to amplitude and phase distortion. To address this issue, an equalization system needs to be added at the receiving or transmitting end to compensate for the channel's influence. However, existing broadband adjustable equalization systems have limitations in terms of step adjustment accuracy, making it difficult to meet the requirements of high-speed, high-precision communication systems. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a broadband fine-step adjustable amplitude equalizer system, comprising an input terminal, an output terminal, an adjustable amplitude unit, a control unit, and a feedback network. An external broadband input signal is input to the amplitude equalizer system through the input terminal and then divided into two groups of signals. One group of signals is output from the output terminal through the adjustable amplitude unit, and the other group is input to the control unit through the feedback network. The output terminal inputs the amplitude of the output signal to the control unit via the feedback network. The control unit inputs the DAC voltage to the adjustable equalizer unit.

[0004] Furthermore, the input terminal specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator; the external input signal is divided into two groups of signals by the signal coupler, one group is transmitted to the feedback network, and the other group is input to the voltage-controlled attenuator after being amplified. The voltage-controlled attenuator receives the control ADC signal and the amplified signal, processes them, and then transmits them to the adjustable equalization unit.

[0005] Furthermore, the adjustable amplitude unit specifically includes multiple amplitude adjustment units, which are connected in parallel, with one end connected to the input terminal and the other end grounded.

[0006] Furthermore, the amplitude adjustment unit specifically includes: a variable resistor diode, an inductor, and a capacitor; the input signal is grounded after passing through the variable resistor diode and the inductor, and the capacitor and the inductor are connected in parallel.

[0007] Furthermore, the control unit specifically uses the DAC output voltage to perform fine-step adjustment of the signal and signal amplitude, and specifically includes: a digital-to-analog converter, an ACU, and multiple analog-to-digital converters; the multiple analog-to-digital converters specifically consist of two; the feedback network input signal passes through the digital-to-analog converter, then through the ACU, and is then transmitted to the two analog-to-digital converters respectively, and then to the voltage-controlled attenuator and the adjustable equalization unit respectively.

[0008] Furthermore, the specific calculation formula for the fine-step amplitude adjustment is: delta A = A max / 2M In the formula, delta A Indicates the minimum step size for amplitude adjustment; A max This represents the maximum adjustable amplitude of the equalization system; M represents the number of bits for adjustment precision; specifically, the performance of the equalization system is evaluated using the mean square error (MSE): MSE = (1 / N) * sum n=1 N |e(n)| 2 In the formula, N represents the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the nth iteration; d(n) represents the desired signal; w(n) T * x(n) represents the output of the equalization system.

[0009] Furthermore, the output terminal specifically includes impedance matching and output signal coupling; the impedance matching specifically adopts a multi-section λ / 4 transform line or a T-type matching network.

[0010] Furthermore, the feedback network receives signals from the output and input terminals and performs signal detection, then transmits the input signal power and amplitude, and the output signal power and amplitude to the control unit.

[0011] This invention provides a broadband fine-step adjustable amplitude equalization system, which has the following advantages:

[0012] This invention enables high-precision, fine-step amplitude adjustment over a wide bandwidth, effectively compensating for amplitude distortion during signal transmission. It features a simple structure, is easy to integrate, and is suitable for various broadband communication systems; it improves signal transmission quality and enhances the overall performance of the communication system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the system structure provided by the present invention;

[0015] Figure 2 The schematic diagram of the input terminal circuit provided for this invention;

[0016] Figure 3 The schematic diagram of the adjustable equalization network provided by this invention;

[0017] Figure 4 The output circuit schematic provided for this invention;

[0018] Figure 5 The schematic diagram of the control unit provided for this invention. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] The following detailed description of the implementation method of the present invention is in conjunction with the accompanying drawings. The description is only a partial embodiment and not all embodiments. For clarity, representations and descriptions unrelated to the present invention are omitted in the drawings and description.

[0021] To provide a clearer understanding of the technical features, objectives, and beneficial effects of this invention, the following detailed description of the technical solution is provided. Obviously, the described embodiments are only a portion of the embodiments of this invention, not all of them, and should not be construed as limiting the scope of implementation of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention.

[0022] like Figure 1 As shown, this invention provides a broadband fine-step adjustable amplitude equalizer system, including an input terminal, an output terminal, an adjustable amplitude unit, a control unit, and a feedback network. An external broadband input signal is input to the amplitude equalizer system through the input terminal and then divided into two groups of signals. One group of signals is output from the output terminal through the adjustable amplitude unit, and the other group is input to the control unit through the feedback network. The output terminal inputs the amplitude of the output signal to the control unit via the feedback network. The control unit inputs the DAC voltage to the adjustable equalizer unit.

[0023] Input terminal, such as Figure 2 As shown, the circuit specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator. The external input signal is split into two groups by the signal coupler. One group is transmitted to the feedback network, and the other group is amplified and then input to the voltage-controlled attenuator. The voltage-controlled attenuator receives the control ADC signal and the amplified signal, processes them, and then transmits them to the adjustable equalization unit. It receives broadband signals, amplifies and conditions the received signal. The circuit principle mainly consists of coupling, amplification, and voltage-controlled attenuation. The signal is coupled to the feedback network to monitor the broadband signal magnitude; amplification reduces system noise and minimizes the impact of the equalization system on the GT value of the entire receiving link; finally, voltage-controlled attenuation preprocesses the signal to compensate for amplitude inconsistencies caused by the back-end equalization.

[0024] like Figure 3As shown, the adjustable amplitude unit specifically includes multiple amplitude adjustment units connected in parallel, with one end connected to the input terminal and the other end grounded. Each amplitude adjustment unit specifically includes a variable resistor diode, an inductor, and a capacitor; the input signal passes through the variable resistor diode and inductor before being grounded, and the capacitor and inductor are connected in parallel. The receiving control unit adjusts the voltage to equalize the signal. The circuit principle consists of one or more sets of variable resistor diodes, capacitors, and inductors. By controlling the voltage magnitude, the resistance value of the variable resistor diode is changed, thereby adjusting the signal equalization amplitude.

[0025] like Figure 5 As shown, the control unit specifically uses the DAC output voltage for fine-step adjustment of the signal and signal amplitude. It includes a digital-to-analog converter (DAC), an ACU, and multiple analog-to-digital converters (ADCs); specifically, there are two ADCs. The feedback network input signal passes through the DAC, then through the ACU, and is then fed into the two ADCs, which in turn are sent to the voltage-controlled attenuator (VCO) and the adjustable equalizer. The controller receives the magnitude of the input signal, the power of the output signal, and the amplitude within the signal band. It uses the DAC output voltage for fine-step adjustment of the signal and signal amplitude to ensure consistency between the input and output signals and to achieve a preset signal amplitude. The control signal output by the controller is a digital signal, which is converted to an analog signal by the DAC to drive the input VCO compensation signal, ensuring consistency between the input and output signal magnitudes. It also drives the variable resistor diodes in the adjustable equalizer unit to adjust the signal amplitude equalization, with a minimum amplitude equalization step of 0.1 dB.

[0026] The specific calculation formula for fine-step amplitude adjustment is: delta A = A max / 2 M In the formula, delta A Indicates the minimum step size for amplitude adjustment; A max This represents the maximum adjustable amplitude of the equalization system; M represents the number of bits for adjustment precision; specifically, the performance of the equalization system is evaluated using the mean square error (MSE): MSE = (1 / N) * sum n=1 N |e(n)| 2 In the formula, N represents the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the nth iteration; d(n) represents the desired signal; w(n) T * x(n) represents the output of the equalization system.

[0027] like Figure 4As shown, the output terminal specifically includes impedance matching and output signal coupling; the impedance matching specifically employs a multi-section λ / 4 transform line or a T-type matching network to achieve impedance matching and output signal coupling. The amplitude equalization principle is based on the resonance of the far-end out-of-band frequency, achieved by using a steep amplitude segment, introducing in-band signal impedance mismatch. This is accomplished by using a multi-section λ / 4 transform line or a T-type matching network to achieve impedance matching between the equalizer and the transmission line, reducing signal reflection; the coupled signal enters the feedback network to monitor the magnitude and amplitude of the equalized signal. A three-section transform matching is selected, and the characteristic impedances Z1, Z2, and Z3 are calculated using the following formula:

[0028] ;

[0029] ;

[0030] .

[0031] The feedback network receives and detects signals from both the input and output terminals, then transmits the input signal power and amplitude, as well as the output signal power and amplitude, to the control unit. It receives monitoring signals, detects the start and end frequencies and the signal strength at the center frequency of the broadband signal, and sends this information to the control unit. The signal power is determined by the AD value of the center frequency, and the amplitude within the signal band is determined by the difference between the AD values ​​of the start and end frequencies.

[0032] The input terminal receives a signal from a broadband communication system. The signal passes through an adjustable equalizer, such as a variable resistor diode, for fine-step adjustment of the signal amplitude. The control unit, based on a feedback network and a preset adjustment algorithm, controls the adjustment of the adjustable equalizer to achieve precise compensation of the signal amplitude. Finally, the adjusted signal is output from the output terminal.

[0033] The working principle specifically includes: receiving a broadband signal through the input terminal; the control unit analyzes the amplitude characteristics of the signal and makes fine-step amplitude adjustments to the adjustable equalizer based on the analysis results; the output terminal outputs the signal with fine-step amplitude adjustment; the feedback network monitors the amplitude characteristics of the input and output signals in real time and feeds back the monitoring results to the control unit, which further adjusts the adjustable equalizer based on the feedback results to maintain the stability of the signal amplitude characteristics.

[0034] This invention enables high-precision, fine-step amplitude adjustment over a wide bandwidth, effectively compensating for amplitude distortion during signal transmission. It features a simple structure, is easy to integrate, and is suitable for various broadband communication systems; it improves signal transmission quality and enhances the overall performance of the communication system.

[0035] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A broadband fine-step adjustable amplitude equalization system, characterized in that, Includes input terminals, output terminals, adjustable amplitude unit, control unit, and feedback network; An external broadband signal is input to the amplitude equalization system through the input terminal and then split into two groups of signals. One group of signals is output from the output terminal through the adjustable amplitude unit, and the other group is input to the control unit through the feedback network. The output terminal inputs the amplitude of the output signal to the control unit through the feedback network. The control unit inputs the DAC voltage to the adjustable equalization unit. The input terminal specifically includes: a signal coupler, an amplifier, and a voltage-controlled attenuator; External input signals are split into two groups of signals via a signal coupler. One group is transmitted to the feedback network, and the other group is amplified and then input to a voltage-controlled attenuator. The voltage-controlled attenuator receives the control DAC signal and the amplified signal, processes them, and then transmits them to the adjustable equalization unit. The adjustable amplitude unit specifically includes multiple amplitude adjustment units, which are connected in parallel, with one end connected to the input terminal and the other end grounded. The amplitude adjustment unit specifically includes: a variable resistor diode, an inductor, and a capacitor; the input signal is grounded after passing through the variable resistor diode and the inductor, and the capacitor and the inductor are connected in parallel. The control unit specifically uses the DAC output voltage to perform fine-step adjustment of the signal and signal amplitude, and specifically includes: an analog-to-digital converter, an ACU, and multiple digital-to-analog converters; the multiple digital-to-analog converters specifically consist of two; the feedback network input signal passes through the analog-to-digital converter, then through the ACU, and is then transmitted to the two digital-to-analog converters respectively, and then to the voltage-controlled attenuator and the adjustable equalization unit respectively; The specific calculation formula of the amplitude fine step adjustment is: delta A = A max / 2 M ; where delta A represents the minimum step of amplitude adjustment; A max represents the maximum amplitude that the equalization system can adjust; M represents the number of bits of adjustment precision; Specifically, the performance of the equalization system is evaluated using the mean square error (MSE): MSE = (1 / N) * sum n=1 N |e(n)| 2 In the formula, N represents the number of observed samples; e(n) = d(n) - |w(n) T * x(n)| represents the error signal at the nth iteration; d(n) represents the desired signal; w(n) T * x(n) represents the output of the equalization system.

2. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that, The output terminal specifically includes impedance matching and output signal coupling; the impedance matching specifically adopts a multi-section λ / 4 transform line or a T-type matching network.

3. The broadband fine-step adjustable amplitude equalization system according to claim 1, characterized in that, The feedback network receives signals from the output and input terminals and performs signal detection before transmitting the input signal power and amplitude, as well as the output signal power and amplitude, to the control unit.

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