CN116243755B - Data acquisition device and data acquisition and monitoring system - Google Patents
Data acquisition device and data acquisition and monitoring system Download PDFInfo
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- CN116243755B CN116243755B CN202310513585.6A CN202310513585A CN116243755B CN 116243755 B CN116243755 B CN 116243755B CN 202310513585 A CN202310513585 A CN 202310513585A CN 116243755 B CN116243755 B CN 116243755B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 24
- 230000003321 amplification Effects 0.000 claims abstract description 19
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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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
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
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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
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
Abstract
The invention discloses a data acquisition device and a data acquisition and monitoring system, wherein the device comprises: a bias adjustment unit configured to generate a bias adjustment voltage; the voltage tracking unit is connected with the bias adjusting unit and is configured to track the bias adjusting voltage so as to output a tracking voltage; the differential amplification unit is connected with the voltage tracking unit and is configured to perform differential amplification on an input signal and the tracking voltage so as to output two paths of differential amplification signals; the sampling unit is configured to sample the two paths of differential amplified signals to obtain a data sampling signal adapted to the input signal. The device can realize good temperature stability of bias adjustment and low bias adjustment noise when data acquisition is carried out, thereby not only improving the accuracy of bias adjustment and having high temperature stability, but also guaranteeing the accuracy of bias adjustment during high-speed and large-signal input.
Description
Technical Field
The present invention relates to the field of data acquisition technologies, and in particular, to a data acquisition device and a data acquisition and monitoring system.
Background
With the development of technology, quantum medical detectors are applied to medical detection to detect the physical condition of a patient. In the related art, when the quantum medical detector performs data acquisition, a bias adjustment DAC is generally adopted to send bias adjustment voltage, and then the bias adjustment voltage is amplified through a high-speed driving amplifier so as to acquire data. However, the high-speed driving amplifier has larger temperature drift and poor bias temperature stability, and the broadband driving amplifier outputs larger broadband noise, so that the system has poor input noise performance and the effective bit number of the collected data is low.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a data acquisition device, which can realize good temperature stability of bias adjustment and low noise of bias adjustment when data acquisition is performed, so that the accuracy of bias adjustment can be improved, the temperature stability is high, and the accuracy of bias adjustment during high-speed and large-signal input can be ensured.
A second object of the present invention is to provide a data acquisition and monitoring system.
To achieve the above object, an embodiment of a first aspect of the present invention provides a data acquisition device, including: a bias adjustment unit configured to generate a bias adjustment voltage; the voltage tracking unit is connected with the bias adjusting unit and is configured to track the bias adjusting voltage so as to output a tracking voltage; the differential amplification unit is connected with the voltage tracking unit and is configured to perform differential amplification on an input signal and the tracking voltage so as to output two paths of differential amplification signals; the sampling unit is connected with the differential amplifying unit and is configured to sample the two paths of differential amplifying signals to obtain a data sampling signal which is matched with the input signal.
According to the data acquisition device provided by the embodiment of the invention, when data acquisition is performed, the bias adjustment voltage is generated through the bias adjustment unit, the bias adjustment voltage is tracked through the voltage tracking unit to output the tracking voltage, the differential amplification unit is used for carrying out differential amplification on the input signal and the tracking voltage so as to output two paths of differential amplified signals, and the sampling unit is used for sampling the two paths of differential amplified signals to obtain the data sampling signal which is matched with the input signal. Therefore, the device can realize that the bias adjustment temperature stability is good and the bias adjustment noise is low when data acquisition is carried out, so that the bias adjustment precision can be improved, the temperature stability is high, and the bias adjustment precision during high-speed and large-signal input can be ensured.
In addition, the data acquisition device according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the voltage tracking unit includes a two-stage combination driving circuit configured to follow-amplify the bias adjustment voltage and the tracking voltage to obtain a voltage follow signal, and to follow-drive the voltage follow signal to output the tracking voltage.
According to one embodiment of the present invention, a two-stage combination driving circuit includes a first amplifier, a second amplifier, and a first feedback resistor, the first feedback resistor being connected between a negative input terminal of the first amplifier and an output terminal of the second amplifier, the second amplifier being configured to amplify a voltage follow signal output from the first amplifier to output a tracking voltage, and to supply the tracking voltage to the first amplifier through the first feedback resistor, the first amplifier being configured to follow-amplify a bias adjustment voltage and the tracking voltage to output a voltage follow signal to the second amplifier.
According to one embodiment of the invention, the first amplifier is a precision, low noise operational amplifier and the second amplifier is a high speed unity gain buffer.
According to an embodiment of the present invention, the two-stage combination driving circuit further includes: one end of the first resistor is connected with the output end of the bias adjusting unit, and the other end of the first resistor is connected with the positive input end of the first amplifier; one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded; and the second capacitor is connected between the negative input end and the output end of the first amplifier.
According to an embodiment of the present invention, the two-stage combination driving circuit further includes: the second resistor is connected between the output end of the first amplifier and the input end of the second amplifier; and one end of the third capacitor is connected with the input end of the second amplifier, and the other end of the third capacitor is grounded.
According to an embodiment of the present invention, the two-stage combination driving circuit further includes: and one end of the fourth capacitor is connected with the output end of the second amplifier, and the other end of the fourth capacitor is grounded.
According to one embodiment of the invention, the dc open loop gain of the first amplifier is much larger than the dc gain of the second amplifier.
According to an embodiment of the present invention, a differential amplifying unit includes: the first gain resistor is suitable for being connected with an input signal at one end; the output end of the voltage tracking unit is connected with the output end of the voltage tracking unit; one end of the second gain resistor is connected with the other end of the matching terminating resistor; the positive input end of the high-speed full-differential amplifier is connected with the other end of the first gain resistor, the negative input end of the high-speed full-differential amplifier is connected with the other end of the second gain resistor, and the positive output end and the negative output end of the high-speed full-differential amplifier are respectively connected with the sampling unit; the second feedback resistor is connected between the positive input end and the negative output end of the high-speed fully-differential amplifier; and the third feedback resistor is connected between the negative input end and the positive output end of the high-speed fully-differential amplifier.
In order to achieve the above objective, a second embodiment of the present invention provides a data acquisition and monitoring system, which includes the above data acquisition device.
According to the data acquisition and monitoring system provided by the embodiment of the invention, by the data acquisition device, good bias adjustment temperature stability and low bias adjustment noise can be realized when data acquisition is performed, so that the bias adjustment precision can be improved, the temperature stability is high, and the bias adjustment precision during high-speed and large-signal input can be ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a block diagram of a data acquisition device according to an embodiment of the present invention;
FIG. 2 is a hardware topology of a data acquisition device according to one embodiment of the present invention;
FIG. 3 is a hardware topology of a data acquisition device according to one embodiment of the present invention;
fig. 4 is a block diagram of a data acquisition and monitoring system according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The data acquisition device and the data acquisition and monitoring system according to the embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a data acquisition device according to an embodiment of the present invention.
As shown in fig. 1, a data acquisition device 100 according to an embodiment of the present invention may include: bias adjustment unit 110, voltage tracking unit 120, differential amplification unit 130, and sampling unit 140.
Wherein the bias adjustment unit 110 is configured to generate a bias adjustment voltage. The voltage tracking unit 120 is connected to the bias adjustment unit 110, and the voltage tracking unit 120 is configured to track the bias adjustment voltage to output a tracking voltage. The differential amplifying unit 130 is connected to the voltage tracking unit 120, and the differential amplifying unit 130 is configured to differentially amplify an input signal and a tracking voltage to output two differential amplified signals. The sampling unit 140 is connected to the differential amplifying unit 130, and the sampling unit 140 is configured to sample the two paths of differential amplified signals to obtain a data sampling signal adapted to the input signal.
Specifically, as shown in fig. 1, the bias adjustment unit 110 generates a bias adjustment voltage of the direct current voltage, and supplies the bias adjustment voltage to the voltage tracking unit 120. The voltage tracking unit 120 may track the bias adjustment voltage and output the tracking voltage, and may prevent the bias adjustment voltage from being shifted. The input signal and the tracking voltage are input to the differential amplifying unit 130, respectively, and the differential amplifying unit 130 differentially amplifies the input signal and the tracking voltage and outputs two differential amplified signals to the sampling unit 140. The sampling unit 140 samples the two differential amplified signals to obtain a data sampling signal adapted to the input signal.
According to one embodiment of the present invention, the voltage tracking unit 120 includes a two-stage combination driving circuit 121, and the two-stage combination driving circuit 121 is configured to perform a follow-up amplification on the bias adjustment voltage and the tracking voltage to obtain a voltage follow signal, and perform a tracking driving on the voltage follow signal to output the tracking voltage.
Further, according to an embodiment of the present invention, as shown in fig. 2, the two-stage combined driving circuit 121 includes a first amplifier A1, a second amplifier A2, and a first feedback resistor Rf1, the first feedback resistor Rf1 is connected between a negative input terminal of the first amplifier A1 and an output terminal of the second amplifier A2, the second amplifier A2 is configured to amplify a voltage following signal output from the first amplifier A1 to output a tracking voltage, and to supply the tracking voltage to the first amplifier A1 through the first feedback resistor Rf1, and the first amplifier A1 is configured to perform a following amplification on a bias adjustment voltage and the tracking voltage to output a voltage following signal to the second amplifier A2. The first amplifier A1 is a precision low noise operational amplifier, and the second amplifier A2 is a high-speed unity gain buffer.
Specifically, as shown in fig. 2, the bias adjustment voltage output from the bias adjustment unit 110 is supplied to the positive input terminal of the first amplifier A1, the first amplifier A1 outputs a voltage following signal to the second amplifier A2, and the second amplifier A2 amplifies the voltage following signal output from the first amplifier A1 and outputs a tracking voltage. The tracking voltage is supplied to the negative input terminal of the first amplifier A1 through the first feedback resistor Rf1, and the first amplifier A1 performs a follow-up amplification on the bias adjustment voltage and the tracking voltage to output a voltage follow-up signal to the second amplifier A2. The first amplifier A1 is a precision low-noise operational amplifier, and can provide low-noise, low-drift and high-precision dc voltage tracking capability, so that the dc voltage applied to the differential amplifying unit 130 accurately tracks the bias adjustment voltage; the second amplifier A2 is a high-speed unity gain buffer, which can provide wide-band large-current driving capability, and when the signal input terminal is a large signal input, a driving current with the same direction as the input signal current is provided at the output terminal.
Specifically, referring to fig. 2, the bias adjustment voltage output by the bias adjustment unit 110 is delivered to the positive input terminal of the first amplifier A1, the output terminal of the second amplifier A2 is the OT point, and the steady voltage V of the OT point OT =V OS +ΔV+V off Wherein V is OS For bias adjustment voltage, deltaV is V OT Tracking error voltage of V off Is the offset voltage of the OT point. Wherein the tracking error voltage，/>For the DC open loop gain of the first amplifier A1,/and/or>Is the dc gain of the second amplifier A2. In one embodiment of the invention, the dc open loop gain of the first amplifier A1 is much larger than the dc gain of the second amplifier A2. With the direct current open loop gain of the first amplifier A1 +.>Direct current gain of the second amplifier A2 +.>For example, tracking error voltage +.>The tracking error voltage is in the order of 1ppm, so the tracking error voltage DeltaV versus the steady-state voltage V at the OT point OT The influence of (2) is small; and offset voltage of OT point +.>WhereinIs the offset voltage of the first amplifier A1, < >>As the offset voltage of the second amplifier A2, the offset voltage V of the OT point can be known from the above off Mainly determined by the offset voltage of the first amplifier A1, and the offset voltage of the second amplifier A2 is relative to the offset voltage V of the OT point off The influence of (2) is small, and since the first amplifier A1 is a precision, low noise operational amplifier, the offset voltage is +.>Very low, long-term drift and temperature drift, so offset voltage V of OT point off Very low and very stable.
According to an embodiment of the present invention, as shown in fig. 3, the two-stage combined driving circuit 121 further includes: one end of the first resistor R1 is connected with the output end of the bias adjusting unit 110, and the other end of the first resistor R1 is connected with the positive input end of the first amplifier A1; one end of the first capacitor C1 is connected with the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded; the second capacitor C2, the second capacitor C2 is connected between the negative input terminal and the output terminal of the first amplifier A1.
Specifically, as shown in fig. 3, the first resistor R1 and the first capacitor C1 form a low-pass filter, which can filter out high-frequency noise output by the bias adjustment unit 110, and reduce the influence of the noise output by the bias adjustment unit 110 on the two-stage combined driving circuit 121. The second capacitor C2 and the first feedback resistor Rf1 form a low-pass filter, so that the bandwidth of a negative feedback loop can be reduced, and meanwhile, the second capacitor C2 provides inner loop phase compensation, and the loop stability is improved.
According to an embodiment of the present invention, as shown in fig. 3, the two-stage combined driving circuit 121 further includes: the second resistor R2 is connected between the output end of the first amplifier A1 and the input end of the second amplifier A2; and one end of the third capacitor C3 is connected with the input end of the second amplifier A2, and the other end of the third capacitor C3 is grounded.
Specifically, as shown in fig. 3, the second resistor R2 and the third capacitor C3 form a low-pass filter, which can perform low-pass filtering on the output of the first amplifier A1, and filter out the output high-frequency noise of the first amplifier A1.
According to an embodiment of the present invention, as shown in fig. 3, the two-stage combined driving circuit 121 further includes: and one end of the fourth capacitor C4 is connected with the output end of the second amplifier A2, and the other end of the fourth capacitor C4 is grounded.
Specifically, as shown in fig. 3, the fourth capacitor C4 may provide a high-frequency bypass effect, and together with the second amplifier A2, provide a low output impedance from dc to high frequency for the OT point, and at the same time, the fourth capacitor C4 may also filter out the output high-frequency noise of the second amplifier A2, so as to further reduce the output noise of the two-stage combined driving circuit 121.
Therefore, the data acquisition device of the embodiment of the invention is composed of the precise low-noise operational amplifier and the high-speed unit gain driving amplifier to form a combined driving circuit, so that precise low-noise broadband bias adjustment is realized, the DC adjustment precision of the bias adjustment unit is determined by the precise low-noise operational amplifier, and the response to high-bandwidth and large input signals is completed by the high-speed unit gain driving amplifier and the RC low-pass circuit, thereby realizing the DC precision (precise low-temperature drift) of bias adjustment and the bias adjustment precision during high-speed and large signal input.
According to one embodiment of the present invention, as shown in fig. 3, the differential amplifying unit 130 includes: the first gain resistor Rg1, one end of the first gain resistor Rg1 is suitable for being connected with an input signal; a matching terminating resistor Rt, one end of which is connected to the output end of the voltage tracking unit 120; the second gain resistor Rg2, one end of the second gain resistor Rg2 is connected with the other end of the matching termination resistor Rt; the positive input end of the high-speed full-differential amplifier A3 is connected with the other end of the first gain resistor Rg1, the negative input end of the high-speed full-differential amplifier A3 is connected with the other end of the second gain resistor Rg2, and the positive output end and the negative output end of the high-speed full-differential amplifier A3 are respectively connected with the sampling unit 140; the second feedback resistor Rf2 is connected between the positive input end and the negative output end of the high-speed fully-differential amplifier A3; and a third feedback resistor Rf3, wherein the third feedback resistor Rf3 is connected between the negative input end and the positive output end of the high-speed fully-differential amplifier A3.
Specifically, as shown in fig. 3, the input signal is sent to the positive input terminal of the high-speed fully differential amplifier A3 through the first gain resistor Rg1, the tracking voltage is sent to the negative input terminal of the high-speed fully differential amplifier A3 through the matching terminating resistor Rt and the second gain resistor Rg2, and the high-speed fully differential amplifier A3 differentially amplifies the input signal and the tracking voltage and outputs two differential amplified signals to the sampling unit 140. The sampling unit 140 samples the two differential amplified signals to obtain a data sampling signal adapted to the input signal. By adjusting the resistance values of the first gain resistor Rg1, the second gain resistor Rg2, the second feedback resistor Rf2, and the third feedback resistor Rf3, the amplification factor of the high-speed fully differential amplifier A3 can be adjusted.
In summary, according to the data acquisition device of the embodiment of the present invention, when data acquisition is performed, the bias adjustment unit generates the bias adjustment voltage, the voltage tracking unit tracks the bias adjustment voltage to output the tracking voltage, the differential amplification unit differentially amplifies the input signal and the tracking voltage to output two paths of differential amplified signals, and the sampling unit samples the two paths of differential amplified signals to obtain the data sampling signal adapted to the input signal. Therefore, the device can realize that the bias adjustment temperature stability is good and the bias adjustment noise is low when data acquisition is carried out, so that the bias adjustment precision can be improved, the temperature stability is high, and the bias adjustment precision during high-speed and large-signal input can be ensured.
Corresponding to the embodiment, the invention also provides a data acquisition and monitoring system.
Fig. 4 is a block diagram of a data acquisition and monitoring system according to an embodiment of the invention.
As shown in fig. 4, a data acquisition and monitoring system 200 according to an embodiment of the present invention includes the data acquisition device 100 described above.
According to the data acquisition and monitoring system provided by the embodiment of the invention, by the data acquisition device, good bias adjustment temperature stability and low bias adjustment noise can be realized when data acquisition is performed, so that the bias adjustment precision can be improved, the temperature stability is high, and the bias adjustment precision during high-speed and large-signal input can be ensured.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (7)
1. A data acquisition device, comprising:
a bias adjustment unit configured to generate a bias adjustment voltage;
the voltage tracking unit is connected with the bias adjustment unit and is configured to track the bias adjustment voltage so as to output a tracking voltage;
the differential amplification unit is connected with the voltage tracking unit and is configured to perform differential amplification on an input signal and the tracking voltage so as to output two paths of differential amplified signals;
the sampling unit is connected with the differential amplifying unit and is configured to sample the two paths of differential amplifying signals to obtain a data sampling signal matched with the input signal;
the voltage tracking unit comprises a two-stage combined driving circuit, wherein the two-stage combined driving circuit is configured to carry out follow amplification on the bias adjustment voltage and the tracking voltage so as to obtain a voltage follow signal, and carry out tracking driving on the voltage follow signal so as to output the tracking voltage;
the two-stage combined driving circuit comprises a first amplifier, a second amplifier and a first feedback resistor, wherein the first feedback resistor is connected between a negative input end of the first amplifier and an output end of the second amplifier, the second amplifier is configured to amplify a voltage following signal output by the first amplifier so as to output the tracking voltage, the tracking voltage is provided to the first amplifier through the first feedback resistor, the first amplifier is configured to carry out following amplification on the bias adjustment voltage and the tracking voltage so as to output the voltage following signal to the second amplifier, and the first amplifier is a precision low-noise operational amplifier and the second amplifier is a high-speed unit gain buffer.
2. The data acquisition device of claim 1 wherein the two-stage combined drive circuit further comprises:
one end of the first resistor is connected with the output end of the bias adjusting unit, and the other end of the first resistor is connected with the positive input end of the first amplifier;
one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded;
and the second capacitor is connected between the negative input end and the output end of the first amplifier.
3. The data acquisition device of claim 2 wherein the two-stage combined drive circuit further comprises:
the second resistor is connected between the output end of the first amplifier and the input end of the second amplifier;
and one end of the third capacitor is connected with the input end of the second amplifier, and the other end of the third capacitor is grounded.
4. A data acquisition device according to claim 3, wherein the two-stage combined drive circuit further comprises:
and one end of the fourth capacitor is connected with the output end of the second amplifier, and the other end of the fourth capacitor is grounded.
5. The data acquisition device of claim 1 wherein the dc open loop gain of the first amplifier is substantially greater than the dc gain of the second amplifier.
6. The data acquisition device of any one of claims 1-5, wherein the differential amplification unit comprises:
a first gain resistor, one end of which is suitable for being connected with the input signal;
the output end of the voltage tracking unit is connected with the output end of the voltage tracking unit;
one end of the second gain resistor is connected with the other end of the matching terminating resistor;
the positive input end of the high-speed full-differential amplifier is connected with the other end of the first gain resistor, the negative input end of the high-speed full-differential amplifier is connected with the other end of the second gain resistor, and the positive output end and the negative output end of the high-speed full-differential amplifier are respectively connected with the sampling unit;
the second feedback resistor is connected between the positive input end and the negative output end of the high-speed fully-differential amplifier;
and the third feedback resistor is connected between the negative input end and the positive output end of the high-speed fully-differential amplifier.
7. A data acquisition and monitoring system comprising a data acquisition device according to any one of claims 1-6.
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| CN117553571B (en) * | 2024-01-11 | 2024-04-02 | 宝鸡宝钛装备科技有限公司 | High-temperature alloy smelting waveform acquisition device |
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| CN109660211A (en) * | 2018-11-19 | 2019-04-19 | 汪洋 | The 5G CMOS radio-frequency power amplifier of power combing and Envelope injection |
| CN109743026A (en) * | 2019-01-02 | 2019-05-10 | 重庆大学 | Low-noise accurate amplifying circuit and its performance improvement method based on operational amplifier |
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