CN116647197A - Multistage conditioning system and method for dynamic periodic signals - Google Patents

Multistage conditioning system and method for dynamic periodic signals Download PDF

Info

Publication number
CN116647197A
CN116647197A CN202310416536.0A CN202310416536A CN116647197A CN 116647197 A CN116647197 A CN 116647197A CN 202310416536 A CN202310416536 A CN 202310416536A CN 116647197 A CN116647197 A CN 116647197A
Authority
CN
China
Prior art keywords
signal
module
gain
analog
signal processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310416536.0A
Other languages
Chinese (zh)
Inventor
李凯
张永杰
边瑞卿
南博龙
高添泉
翟宇
庞存锁
聂鹏飞
苏新彦
韩焱
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North University of China
Original Assignee
North University of China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North University of China filed Critical North University of China
Priority to CN202310416536.0A priority Critical patent/CN116647197A/en
Publication of CN116647197A publication Critical patent/CN116647197A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The application relates to the field of signal processing, and discloses a multistage conditioning system and a multistage conditioning method for a dynamic periodic signal, wherein the multistage conditioning system for the dynamic periodic signal comprises a signal preprocessing module, an adjustable gain module and a signal processing module; the signal preprocessing module attenuates the input periodic analog signal when the amplitude exceeds the input range of the adjustable gain module; the adjustable gain module is controlled by the signal processing module to change the amplification factor; the signal processing module realizes analog-to-digital conversion, gain control and data calculation. The adjustable gain module controls the amplitude of the output signal between alpha times and beta times of the power supply voltage of the operational amplifier by adjusting the amplification factor, so that the problems that the signal is too small to observe and the signal is too large to generate distortion are avoided, and the optimal observation voltage is obtained; the application can realize undistorted acquisition of the signals changing along with the time amplitude and the frequency, and has important significance for analysis and processing of the periodic analog signals.

Description

Multistage conditioning system and method for dynamic periodic signals
Technical Field
The application relates to the field of signal processing, in particular to a multistage conditioning system and method for dynamic periodic signals.
Background
The electronic equipment needs to use a sensor for acquiring physical information, the sensor can sense the measured information, the information sensed by detection can be converted into an electric signal or other information output in a required form according to a certain rule, the signal acquired by the sensor can be a periodic signal in certain scenes, the frequency of the signal can reflect important information of the measured physical quantity, the frequency of the signal can be acquired in real time, and the waveform characteristics of the signal in each period also reflect some meanings of the measured physical quantity.
The measured physical quantity can change along with time, the frequency and the size of the sensor acquired signal change correspondingly, and the physical signal characteristics can be analyzed only by acquiring the correct waveform of the sensor signal in real time. When the signal is amplified, the output result is distorted when the voltage amplitude of the input signal exceeds the specified input voltage of the operational amplifier, and the output signal is unfavorable for observation when the input voltage is too small. If the digital signal corresponding to the analog signal output by the sensor is required to be obtained, a proper amplification factor is required to be selected for the sensor signal, and the amplification factor is required to be adjusted in real time because the size of the sensor signal may be greatly changed in the acquisition process, so that the amplified signal is prevented from being distorted, and a distortion-free signal is obtained. Therefore, a high-range gain self-adaptive conditioning method is required to adapt to input signals with wide range amplitude, and the method has important significance in the aspects of improving amplification precision, signal processing and the like.
Disclosure of Invention
In view of the above, the present application is directed to a multi-stage conditioning system and method for dynamic periodic signals, which can solve the problem of undistorted acquisition of digital signals of input dynamic periodic analog signals.
In order to achieve the above object, the following technical scheme is adopted:
a multistage conditioning system of dynamic periodic signals comprises a signal preprocessing module, an adjustable gain module and a signal processing module;
the signal preprocessing module attenuates the input periodic analog signal when the amplitude of the input periodic analog signal exceeds the input range of the adjustable gain module; the adjustable gain module is controlled by the signal processing module to change the amplification factor; the signal processing module realizes analog-to-digital conversion, gain control and data calculation.
As a further improvement of the application, the amplitude of the output signal of the adjustable gain module is in the range of the power supply voltage of the operational amplifier from alpha times to beta times, the waveform cannot be distorted due to too small and the signal is truncated due to too large output, and the undistorted waveform can be obtained.
As a further improvement of the application, the signal preprocessing module internally comprises a first voltage comparator, a second voltage comparator, a first multipath analog switch and a first attenuation circuit;
if the voltage value in the whole period of the input analog signal does not exceed gamma volts, the signal is not required to be reduced; otherwise, the signal is controlled to enter the adjustable gain module after passing through the first attenuation circuit;
the signal processing unit of the signal processing module controls whether the input analog signal passes through the first attenuation circuit according to the output feedback of the first voltage comparator and the second voltage comparator.
As a further improvement of the application, the adjustable gain module is formed by cascade connection of two stages of amplifying circuits, the amplification factor is changed by switching channels of the second, third, fourth and fifth multi-channel analog switches, and finally the output signal improves the signal output capacity through a voltage follower.
As a further improvement of the application, the first-stage amplifying circuit of the adjustable gain module consists of a second multi-path analog switch, a third multi-path analog switch and m operational amplifiers; the second-stage amplifying circuit consists of a fourth multipath analog switch, a fifth multipath analog switch and n operational amplifiers; the requirement m is greater than n, the first-stage amplifying circuit is a main gain gear switching circuit, and the second-stage amplifying circuit is an auxiliary gain switching circuit; when the gain gear is controlled to be changed, the gain gear of the second-stage amplifying circuit is preferentially adjusted.
As a further improvement of the application, in order to realize that the amplitude of the output signal is in epsilon-gamma after the dynamic signal with the amplitude change passes through the adjustable gain module, different amplification factors are required to be set for amplifying the signal, and the maximum amplification factor is gamma multiplied by 10 6 At least 1, the gain gears are ordered from big to small according to the amplification factors, and the amplification factor ratio of two adjacent gain gears is requiredAnd proper gears are divided from the middle of the maximum amplification factor to the minimum amplification factor through the cascade connection of the two stages of amplification circuits.
As a further improvement of the application, the signal processing module comprises an attenuation circuit, an analog-to-digital conversion module and a signal processing unit, wherein the attenuation circuit is used for carrying out attenuation on an output signal of the adjustable gain module and adapting the range of the analog signal input level of the analog-to-digital conversion module, the analog-to-digital conversion module is connected with the signal processing unit by using a communication interface, and a conversion result of the analog-to-digital conversion module is sent to the signal processing unit; the signal processing unit analyzes the acquired data, controls the gating ends of the multipath analog switches of the adjustable gain module to adjust the amplification factor, enables the amplitude of the output signal of the adjustable gain module to be in a set threshold range, monitors the output level of the signal preprocessing module, and determines whether to attenuate the input analog signal by controlling the analog electronic switch.
A method for multi-stage conditioning of a dynamic periodic signal, comprising the steps of:
s1: the multi-stage conditioning system is electrified, the signal processing module controls the gain multiple of the adjustable gain module to be 1, and the enabling end of the first multi-path analog switch is closed to enable all channels to be in an off state; at this time, the adjustable gain module is in a minimum gain state, and input analog signals are forbidden to enter the adjustable gain module;
s2: starting a signal preprocessing module, analyzing a comparison result feedback level of a voltage comparator within the range of N time length by a signal processing unit, gating a first multi-path analog switch according to the feedback result of the comparator module, and entering a step S3 after the first multi-path analog switch is gated, and simultaneously, monitoring an output result of the voltage comparator by the signal processing unit and controlling a gating port of the first multi-path analog switch in real time;
s3: the signal processing module processes the acquired digital signals, compares absolute values of all data in the N time lengths, finds out the maximum absolute value of the absolute values to be recorded as lambda, and enters step S4;
s4: the signal processing module controls the multipath analog switch of the adjustable gain module to change the gain gear, and the gain gear is divided into the following three conditions according to lambda value:
(1)step S5 is carried out without adjusting the gain gear;
(2)the gain gear is increased by one gear, and the step S3 is carried out;
(3)the gain gear is reduced by one gear, and the step S3 is carried out;
s5: and continuing to analyze the digital signal data acquired in each N time periods, and if the maximum absolute value lambda in all the data is changed, entering step S4.
As a further improvement of the application, the amplification factor is controlled by a signal processing unit, the amplification factor of each converted digital signal is known, the signal processing unit calculates the acquired data, and the input analog signal size S is calculated by the following formula:
wherein B is a digital signal finally converted from an input analog signal, K is the attenuation multiple of a first attenuation circuit, L is the attenuation multiple of a second attenuation circuit, and A is the amplification multiple of an adjustable gain module.
The beneficial effects of the application are as follows:
(1) The adjustable gain module controls the amplitude of the output signal between alpha times and beta times of the power supply voltage of the operational amplifier by adjusting the amplification factor, so that the problems that the signal is too small to observe and the signal is too large to generate distortion are avoided, and the optimal observation voltage is obtained;
(2) The application can effectively collect the periodic signal with amplitude ranging from +/-1 uV to +/-100V, realize the undistorted collection of the signal with amplitude and frequency variation along with time, avoid the distortion of the amplification result of the dynamic variation signal in the fixed gain circuit, and has important significance for the analysis and treatment of the periodic analog signal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic general construction of the present application;
FIG. 2 is a flow chart of the working principle of the application;
fig. 3 is a data processing flow chart of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
Fig. 1 is a schematic general structure of the present application, which is a multi-stage conditioning method for dynamic periodic signals, including a signal preprocessing module, an adjustable gain module, and a signal processing module.
The input signal of the application can be a periodic signal with amplitude and frequency variation, the frequency of the input signal is required to be higher than 1Hz, and the amplitude of the input signal is required to be within the range of +/-1 uV to +/-100V.
In the present application, the N time length represents the time length occupied by a plurality of cycles of the input analog signal.
The power supply voltage of the operational amplifier in the adjustable gain module is M volts, the operational amplifier requires that the input signal voltage range is smaller than the power supply voltage, the operational amplifier chip is damaged due to overlarge input signal voltage, the amplitude of the amplified signal is often not up to the power supply voltage due to the influence of the output rail in the actual use process of the operational amplifier, the amplitude of the amplified signal is required to be prevented from approaching the power supply voltage to enable the output waveform to be distorted relative to the original waveform, the adjustable gain module is controlled to output the signal in the range of alpha-to beta-times power supply voltage, the values of alpha and beta are referred to the formula (1), the output waveform cannot be distorted due to the fact that the distortion is too small, the signal is not truncated due to the fact that the output is too large, the undistorted waveform can be obtained, and the input signal cannot be reduced due to the fact that the minimum amplification factor of the adjustable gain module is 1, and the signal preprocessing module is required to be controlled to enable the amplitude of the input signal of the adjustable gain module to be smaller than or equal to gamma volts.
If the voltage amplitude of the output signal of the adjustable gain module is smaller than 0.1M volt, the output signal is too small, the signal is easy to distort and is unfavorable for analyzing the signal, so that the minimum value of alpha is 0.1; if the voltage amplitude of the output signal of the adjustable gain module is greater than 0.8M volt, the amplitude of the output signal is close to the power supply, the acquired signal can be distorted, and the acquisition result is wrong, so that when the voltage of the output signal is greater than 0.8M volt, the gain multiple is reduced in time, and the maximum value of beta is 0.8;
if the amplitude of the input analog signal is larger than gamma volts, the signal needs to be attenuated, and the maximum allowable input signal amplitude is 100 volts, so that the voltage is attenuated to be K 1 The voltage after attenuation can be ensured not to exceed gamma volts.
The signal preprocessing module comprises a first voltage comparator, a second voltage comparator, a first multipath analog switch and a first attenuation circuit.
The positive-phase input end of the first voltage comparator is connected with an input signal, and the negative-phase input end of the first voltage comparator is connected with gamma-volt direct-current voltage as comparison voltage; the positive-phase input end of the second voltage comparator is connected with an input signal, and the negative-phase input end of the second voltage comparator is connected with-gamma-volt direct-current voltage as comparison voltage; the output end of the voltage comparator is connected with the power supply of the signal processing module by using a pull-up resistor. The first voltage comparator outputs a high level to indicate that the amplitude of the input analog signal is larger than gamma volts, and a low level to indicate that the input analog signal is smaller than gamma volts; the second voltage comparator outputs a high level to indicate that the input analog signal is greater than-gamma volts, and a low level to indicate that the minimum value of the input analog signal is less than-gamma volts, i.e., the amplitude is greater than gamma volts. And feeding back comparison results of the first voltage comparator and the second voltage comparator to the signal processing unit. The first multipath analog switch is an electronic switch with one of two channels being conducted, and is provided with a channel gating end and an enabling end, and a signal processing unit can be used for controlling a gating interface of the analog switch to control the on-off of the two channels. The first attenuation circuit reduces the signal to K of the input signal 1 The signal amplitude after shrinking is ensured to be smaller than gamma volts.
The signal processing unit controls whether the input analog signal passes through the first attenuation circuit before entering the adjustable gain module according to the output results of the first voltage comparator and the second voltage comparator. If the feedback level of the first voltage comparator is low and the feedback level of the second voltage comparator is high in the N time length, the signal processing unit controls the channel a of the first multi-path analog switch to be switched on and the channel b of the first multi-path analog switch to be switched off; as long as the feedback level of the first voltage comparator is high or the feedback level of the second voltage comparator is low, the signal processing unit immediately controls the channel a of the first multi-path analog switch to be switched off and the channel b to be switched on; after the channel a of the first multi-path analog switch is turned off and the channel b is turned on, if the feedback level of the first voltage comparator is low and the feedback level of the second voltage comparator is high in the N time length, the signal processing unit controls the channel a of the first multi-path analog switch to be turned on and the channel b to be turned off again;
the voltage reduction multiple K of the signal preprocessing module takes the input analog signal voltage amplitude as W volt as an example. When W is less than or equal to γ, no reduction of the output signal is required, where k=1; when W is>At γ, the first attenuation circuit reduces by a factor k=k 1 ，K 1 The value can be calculated from equation (1).
The signal preprocessing module is used for preprocessing the input signal of the adjustable gain module to enable the input signal of the adjustable gain module to be an input analog signalThe multiple ensures that the input analog signal level accords with the input range of the adjustable gain module.
As shown in fig. 1, the adjustable gain module is composed of multiple analog switches, an operational amplifier and a voltage follower, the amplification factor is changed by switching channels of the second, third, fourth and fifth multiple analog switches, and finally, the output signal improves the signal output capacity through the voltage follower; in order to realize that the voltage with the amplitude varying can amplify the voltage with the amplitude ranging from epsilon to gamma volts, different amplification factors are required to be set for amplifying signals, and the maximum amplification factor is gamma multiplied by 10 6 The minimum is 1, the gain gears are ordered according to the amplification factors from big to small, and the phase is requiredThe ratio of the amplification factors of two adjacent gain stagesIf the ratio of the amplification factors of two adjacent gain stages +.>The situation that the amplitude of the output signal of the adjustable gain module is smaller than epsilon volts before the gain gear is adjusted, and the amplitude of the output signal is larger than gamma volts after one gain gear is improved can occur, and at the moment, the system cannot select proper gain to amplify the gain gear.
The first-stage amplifying circuit consists of a second multi-path analog switch, a third multi-path analog switch and m operational amplifiers, wherein a wire and m operational amplifiers are connected between corresponding channels of the second multi-path analog switch and the third multi-path analog switch, a signal directly indicates that the gain multiple is 1 through the wire, the m operational amplifiers respectively take other amplification multiples, and the gain multiple of the operational amplifiers A0 to Am increases from small to large; the signal processing unit is used for controlling gating ends of the second multi-path analog switch and the third multi-path analog switch simultaneously to control switching of different gain multiples;
the second-stage amplifying circuit consists of a fourth multi-path analog switch, a fifth multi-path analog switch and n operational amplifiers, wherein a wire and the n operational amplifiers are connected between corresponding channels of the fourth multi-path analog switch and the fifth multi-path analog switch, signals directly represent that the gain multiple is 1 through the wire, the n operational amplifiers respectively take other amplification multiples, and the gain multiple of the operational amplifiers B0 to Bn increases from small to large; the signal processing unit is used for controlling gating ends of the fourth multi-path analog switch and the fifth multi-path analog switch simultaneously to control switching of different gain multiples;
the two-stage amplifying circuit is cascaded with (m+1) x (n+1) gain combinations, and the gain multiple is 1 to gamma x 10 6 Dividing proper gain gear;
taking the alpha value as 0.3 and the beta value as 0.8, taking the operational amplifier power supply voltage as an example of + -5V, and gamma=4, the amplification ratio of two adjacent gain stages is requiredAt gain multiple of 1 to 4×10 6 Dividing proper gain gear; the amplification factors of the operational amplifiers A0, A1, A2, A3, A4, A5, B0 and B1 of the adjustable gain module are respectively configured as 10, 100, 1000, 10000, 100000, 1000000, 2 and 4; the gain multiple of the first-stage amplifying circuit can be selected from 1, 10, 100, 1000, 10000, 100000 and 1000000; the gain multiple of the second-stage amplifying circuit is 1, 2 and 4; 21 amplification factor combinations are cascaded through a two-stage operational amplifier circuit, and the amplification factor ratio of two adjacent gain gears is 2 and 2.5 and is smaller than +.>Meets the requirements.
Setting m > n, wherein the first-stage amplifying circuit is a main gain gear switching circuit, and the second-stage amplifying circuit is an auxiliary gain switching circuit; when the gain gear is controlled to be changed, the gain gear of the second-stage amplifying circuit is firstly adjusted;
assuming that the output voltage amplitude of the adjustable gain module is zeta volts, the gain gear switching flow is as follows:
when ζ < ε, the gain gear of the adjustable gain module is increased, the gain gear of the first-stage amplifying circuit is kept unchanged, the gain gear of the second-stage amplifying circuit is increased until ζ is more than or equal to ε, the gain gear is stopped being adjusted, if ζ < ε is still remained after the gain gear of the second-stage amplifying circuit is adjusted to be maximum, the first-stage gain gear is controlled to be increased while the gain of the second-stage amplifying circuit is reset to be minimum gear, and then the operation is repeated until ζ is more than or equal to ε;
when ζ > gamma, reducing the gain gear of the adjustable gain module, keeping the gain gear of the first-stage amplifying circuit unchanged, reducing the gain gear of the second-stage amplifying circuit until ζ is less than or equal to gamma, stopping adjusting the gain gear, if ζ > gamma is still reached after the gain gear of the second-stage amplifying circuit is adjusted to be minimum, controlling the first-stage gain gear to be reduced by one gear while the gain of the second-stage amplifying circuit is reset to be maximum gear, and repeating the operation until ζ is less than or equal to gamma;
the signal processing module is used for controlling the signal preprocessing module and the adjustable gain module, so that the periodic analog signal with the input amplitude range of 1 uV-100V can be output into the analog signal with the amplitude range of epsilon-gamma V after passing through the conditioning system.
The output of the second-stage amplifying circuit is connected with a voltage follower to improve the signal output capacity and then is divided into two paths of outputs; one path is analog signal output, the oscillograph can be directly used for observing waveforms, and information such as frequency of input analog signals can be obtained from waveform types; the other path is connected with the signal processing module to acquire digital signals, and the signals are restored by combining the amplification factors, so that the restoration of the input analog signals can be realized.
The signal processing module comprises a second attenuation circuit, an analog-to-digital conversion module and a signal processing unit, wherein the second attenuation circuit is used for carrying out attenuation on an output signal of the adjustable gain module and adapting the range of the analog signal input level of the analog-to-digital conversion module, the analog-to-digital conversion module is connected with the signal processing unit by using a common communication protocol, and a conversion result of the analog-to-digital conversion module is sent to the signal processing unit; the signal processing unit analyzes the acquired data, controls the gating ends of the multipath analog switches of the adjustable gain module to adjust the amplification factor, enables the amplitude of the output signal of the adjustable gain module to be in a set threshold range, monitors the output level of the signal preprocessing module, and determines whether to attenuate the input analog signal by controlling the analog electronic switch.
The voltage reduction multiple of the second attenuation circuit is L, and the power supply voltage of the signal processing module is P volts. When P is more than or equal to M, the output signal does not need to be reduced, and at the moment, L=1; when P<M, the voltage reduction factor of the attenuation circuit is set to beAt this timeThe input signal through the signal processing module is reduced to be output by the adjustable gain module>The output voltage corresponding to the input voltage epsilon volts is +.>The input voltage gamma volts corresponds to an output voltage of +.>And (5) volts.
Referring to fig. 2, the workflow of the multi-stage conditioning system is as follows:
s1: the multi-stage conditioning circuit system is electrified, the signal processing module controls the total amplification factor of the adjustable gain module to be 1, and the enabling end of the first multi-path analog switch is closed to enable all channels to be in an off state; at this time, the adjustable gain module is in a minimum gain state, and input analog signals are forbidden to enter the adjustable gain module;
s2: and starting a signal preprocessing module, analyzing the comparison result feedback level of the voltage comparator within the range of N time lengths by the signal processing unit, and gating the first multi-path analog switch according to the feedback result of the comparator module. Step S3 is carried out after the first multi-path analog switch is gated, and meanwhile, the signal processing unit maintains monitoring on the output result of the voltage comparator and controls the gating port of the first multi-path analog switch in real time;
s3: the signal processing module processes the acquired digital signals, compares absolute values of all data in the N time lengths, finds out the maximum absolute value of the absolute values to be recorded as lambda, and enters step S4;
s4: the signal processing module controls the multipath analog switch of the adjustable gain module to change the gain gear, and the gain gear is divided into the following three conditions according to lambda value:
(1)step S5 is carried out without adjusting the gain gear;
(2)the gain gear is increased by one gear, and the step S3 is carried out;
(3)the gain gear is reduced by one gear, and the step S3 is carried out;
s5: continuously analyzing the digital signal data acquired in each N time periods, and if the maximum absolute value lambda in all the data is changed, entering a step S4;
referring to fig. 3, the signal processing unit collects digital signals after the conversion of the input analog signals, and since the amplification factor is controlled by the signal processing unit, the amplification factor of each converted digital signal is known, the collected data is resolved, the actual size of the signal before amplification can be truly restored, and the size S of the input analog signal is calculated by the formula (2).
In the formula (2), B is a digital signal finally converted from an input analog signal, K is the attenuation multiple of a first attenuation circuit, L is the attenuation multiple of a second attenuation circuit, and A is the amplification multiple of an adjustable gain module.
After all the acquired digital signals B are calculated and restored to the digital signals S through the formula (2), drawing software is used for drawing the digital signals S, and finally, a waveform image of the input analog signals is obtained.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, component disassembly, or combination thereof, etc. that falls within the spirit and principles of the present application should be included in the scope of the present application.

Claims (9)

1. A multi-stage conditioning system for a dynamic periodic signal, characterized by: the system comprises a signal preprocessing module, an adjustable gain module and a signal processing module;
the signal preprocessing module attenuates the input periodic analog signal when the amplitude of the input periodic analog signal exceeds the input range of the adjustable gain module; the adjustable gain module is controlled by the signal processing module to change the amplification factor; the signal processing module realizes analog-to-digital conversion, gain control and data calculation.
2. A multi-stage conditioning system for dynamic periodic signals according to claim 1, wherein: the amplitude of the output signal of the adjustable gain module is in the range of the power supply voltage of the operational amplifier from alpha times to beta times, the waveform cannot be distorted due to undersize and the signal is truncated due to oversized output, and the undistorted waveform can be obtained.
3. A multi-stage conditioning system for dynamic periodic signals according to claim 1, wherein: the signal preprocessing module comprises a first voltage comparator, a second voltage comparator, a first multipath analog switch and a first attenuation circuit;
if the voltage value in the whole period of the input analog signal does not exceed gamma volts, the signal is not required to be reduced; otherwise, the signal is controlled to enter the adjustable gain module after passing through the first attenuation circuit;
the signal processing unit of the signal processing module controls whether the input analog signal passes through the first attenuation circuit according to the output feedback of the first voltage comparator and the second voltage comparator.
4. A multi-stage conditioning system for dynamic periodic signals according to claim 1, wherein: the adjustable gain module is formed by cascade connection of two-stage amplifying circuits, the amplification factor is changed by switching channels of the second, third, fourth and fifth multipath analog switches, and finally, the output signal improves the signal output capacity through a voltage follower.
5. The multi-stage conditioning system for dynamic periodic signals according to claim 4, wherein: the first-stage amplifying circuit of the adjustable gain module consists of a second multi-path analog switch, a third multi-path analog switch and m operational amplifiers; the second-stage amplifying circuit consists of a fourth multipath analog switch, a fifth multipath analog switch and n operational amplifiers; the requirement m is greater than n, the first-stage amplifying circuit is a main gain gear switching circuit, and the second-stage amplifying circuit is an auxiliary gain switching circuit; when the gain gear is controlled to be changed, the gain gear of the second-stage amplifying circuit is preferentially adjusted.
6. The multi-stage conditioning system for dynamic periodic signals according to claim 5, wherein: in order to realize that the amplitude of the output signal is in epsilon-gamma after the dynamic signal with the amplitude changing passes through the adjustable gain module, different amplification factors are required to be set for amplifying the signal, and the maximum amplification factor is gamma multiplied by 10 6 At least 1, the gain gears are ordered from large to small according to the amplification factors, and two adjacent gain gears are required And proper gears are divided from the middle of the maximum amplification factor to the minimum amplification factor through the cascade connection of the two stages of amplification circuits.
7. A multi-stage conditioning system for dynamic periodic signals according to claim 1, wherein: the signal processing module comprises an attenuation circuit, an analog-to-digital conversion module and a signal processing unit, wherein the attenuation circuit is used for carrying out attenuation on an output signal of the adjustable gain module and adapting an analog signal input level range of the analog-to-digital conversion module, the analog-to-digital conversion module is connected with the signal processing unit through a communication interface, and a conversion result of the analog-to-digital conversion module is sent to the signal processing unit; the signal processing unit analyzes the acquired data, controls the gating ends of the multipath analog switches of the adjustable gain module to adjust the amplification factor, enables the amplitude of the output signal of the adjustable gain module to be in a set threshold range, monitors the output level of the signal preprocessing module, and determines whether to attenuate the input analog signal by controlling the analog electronic switch.
8. A method for multi-stage conditioning of a dynamic periodic signal, comprising the steps of:
s1: the multi-stage conditioning system is electrified, the signal processing module controls the gain multiple of the adjustable gain module to be 1, and the enabling end of the first multi-path analog switch is closed to enable all channels to be in an off state; at this time, the adjustable gain module is in a minimum gain state, and input analog signals are forbidden to enter the adjustable gain module;
s2: starting a signal preprocessing module, analyzing a comparison result feedback level of a voltage comparator within the range of N time length by a signal processing unit, gating a first multi-path analog switch according to the feedback result of the comparator module, and entering a step S3 after the first multi-path analog switch is gated, and simultaneously, monitoring an output result of the voltage comparator by the signal processing unit and controlling a gating port of the first multi-path analog switch in real time;
s3: the signal processing module processes the acquired digital signals, compares absolute values of all data in the N time lengths, finds out the maximum absolute value of the absolute values to be recorded as lambda, and enters step S4;
s4: the signal processing module controls the multipath analog switch of the adjustable gain module to change the gain gear, and the gain gear is divided into the following three conditions according to lambda value:
(1)step S5 is carried out without adjusting the gain gear;
(2)the gain gear is increased by one gear, and the step S3 is carried out;
(3)the gain gear is reduced by one gear, and the step S3 is carried out;
s5: and continuing to analyze the digital signal data acquired in each N time periods, and if the maximum absolute value lambda in all the data is changed, entering step S4.
9. The method for multi-level conditioning of a dynamic periodic signal according to claim 8, wherein: the amplification factor is controlled by a signal processing unit, the amplification factor of each converted digital signal is known, the signal processing unit calculates the acquired data, and the size S of the input analog signal is calculated by the following formula:
wherein B is a digital signal finally converted from an input analog signal, K is the attenuation multiple of a first attenuation circuit, L is the attenuation multiple of a second attenuation circuit, and A is the amplification multiple of an adjustable gain module.
CN202310416536.0A 2023-04-17 2023-04-17 Multistage conditioning system and method for dynamic periodic signals Pending CN116647197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310416536.0A CN116647197A (en) 2023-04-17 2023-04-17 Multistage conditioning system and method for dynamic periodic signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310416536.0A CN116647197A (en) 2023-04-17 2023-04-17 Multistage conditioning system and method for dynamic periodic signals

Publications (1)

Publication Number Publication Date
CN116647197A true CN116647197A (en) 2023-08-25

Family

ID=87617694

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310416536.0A Pending CN116647197A (en) 2023-04-17 2023-04-17 Multistage conditioning system and method for dynamic periodic signals

Country Status (1)

Country Link
CN (1) CN116647197A (en)

Similar Documents

Publication Publication Date Title
JP5045151B2 (en) Transmission power control circuit
US20060023095A1 (en) Flexy-power amplifier: a new amplifier with built-in power management
US6577196B2 (en) Method and circuit for automatic gain control of a signal amplifier
JPH09326698A (en) Offset correction method and device
CN108226619A (en) A kind of amperometric sensor signal conditioning circuit
KR100432598B1 (en) AGC apparatus
CN101917197B (en) Double-channel analog/digital combined variable gain data acquisition device
US7098738B2 (en) Fine step and large gain range programmable gain amplifier
CN116647197A (en) Multistage conditioning system and method for dynamic periodic signals
US6577191B2 (en) Automatic gain control circuit for analog signals
JP3142915B2 (en) Analog-to-digital converter
US6608583B1 (en) Analog signal input circuit in analog signal processing apparatus
KR101923829B1 (en) Semiconductor device for reading out signal from sensor
EP0508655B1 (en) Equalized eye pattern instrument
CN108206680A (en) Variable gain amplifier
CN115529041A (en) Sectional optional signal conditioning circuit and measuring device
Ivanov et al. Universal programmable DC amplifier for low frequency noise measurements
US7646245B2 (en) Amplifier
US7098732B2 (en) Multi-stage variable gain amplifier utilizing overlapping gain curves to compensate for log-linear errors
DE102012110737B4 (en) Analog-digital converter arrangement
CN112486065A (en) Alternating current signal sampling method and device and handheld code scanning printer
US5525922A (en) Automatic gain and level control circuit and method
CA2042146A1 (en) High precision composite amplifier with improved high speed response
US7446605B2 (en) Amplifier arrangement with controllable gain and method for controlling an amplifier gain
FI71448B (en) AUTOMATISK FOERSTAERKNINGSREGLERINGSKRETS FOER EN TELEVISION

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination