CN106680558A - Input channel active protection circuit for large dynamic range oscilloscope - Google Patents
Input channel active protection circuit for large dynamic range oscilloscope Download PDFInfo
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- CN106680558A CN106680558A CN201611163254.0A CN201611163254A CN106680558A CN 106680558 A CN106680558 A CN 106680558A CN 201611163254 A CN201611163254 A CN 201611163254A CN 106680558 A CN106680558 A CN 106680558A
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- impedance matching
- input impedance
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
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Abstract
The invention relates to an input channel active protection circuit for a large dynamic range oscilloscope. An input signal is connected to the input end of an input impedance matching module or the input end of an input impedance matching and power attenuation module, and the input ends of a plurality of operational amplification modules are respectively connected with the output end of the input impedance matching module or the output end of an input impedance matching and power attenuation module. The output ends of the plurality of operational amplification modules are respectively connected with an input end of a load sharing module, and the output end of the load sharing module is connected with an output signal. A bias adjusting module is disposed before the plurality of operational amplification modules. The bias adjusting module comprises an adjustable resistor, a current limiting resistor and an input impedance resistor, wherein the adjustable resistor, the current limiting resistor and the input impedance resistor are connected sequentially. The other end of the adjustable resistor is connected with a positive voltage or a negative voltage, and the other end of the input impedance resistor is grounded. The circuit irons out the defects in the prior art that signal reflection, caused by impedance mismatching, of a passive device (diode) cannot achieve the protection of a negative input signal at a protection moment, and the driving capability is weak.
Description
Technical field
The invention belongs to Electronics and Information Engineering field, more particularly to a kind of active guarantor of Larger Dynamic scope oscillograph input channel
Protection circuit.
Background technology
In the measurement of fast pulse ray signal, the dynamic range of signal amplitude reaches more than 8 magnitudes.Surveyed using oscillograph
During amount, need the method overlapped using range to realize signal integrity measurement.
When Larger Dynamic domain impulse signal measurement is carried out, when oscillograph range is much smaller than input signal amplitude, for showing
The unprotected situation of ripple device, easily damages oscillograph channel.To protect oscillograph channel, 1 is needed:1 oscillograph channel is protected
Shield device.
Oscillograph channel guard device needs to meet following condition：Input bandwidth is high, input direct-current is coupled, input impedance 50
Ω, out-put dynamic range are big, noise is little etc..For Larger Dynamic domain impulse signal, should also have output saturability, i.e., defeated
When entering signal more than certain amplitude, output is maintained at a stabilizing panel angle value, and the stabilizing panel angle value in the defeated of oscillograph channel
Enter within range of signal, to reach the purpose of protection oscillograph channel.
A kind of vertical input channel protection circuit of oscillograph is prior art discloses, the circuit adopts passive device -- clamper
Diode is used as core protection device.Input signal is through power attenuation, impedance matching, bias-adjusted, protection, amplifying circuit
Deng realizing 1:1 signal output, the circuit there are problems that following：(1), using passive device-clamp diode, as guarantor
The core devices of shield, in protection moment, diode current flow, its conduction impedance is substantially reduced, and affects the impedance matching of whole system
Situation, needs to adopt power attenuation and impedance matching to reduce signaling reflex simultaneously, is not fundamentally solving the problem；(2)、
Diode is one way conducting device, and only to positive input, significantly signal has protective effect, and negative sense input signal is not protected
Shield is acted on；(3), power attenuation adopts fixed attenuator, and attenuation multiple is big, is to realize 1:1 signal output, amplifying circuit times magnification
Number is big, and its input bandwidth is also reduced simultaneously；(4), amplifying circuit adopts single amplifier, and output driving ability is weak, for 50 Ω
Input impedance, can export the signal of maximum ± 3V.
The content of the invention
The technical problem to be solved is：There is provided a kind of Larger Dynamic scope oscillograph input channel has source protection electricity
Road, to solve prior art in passive device (diode) protection moment, it is right because of signaling reflex caused by impedance mismatch
Negative sense input signal can not be protected, the defect such as driving force is weak.
To solve above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of Larger Dynamic scope oscillograph input channel active protective circuit, it is characterized in that：Including input impedance
Matching module or input impedance matching and power attenuation module, bias-adjusted module, multiple operation amplifier modules, load Sharing mould
Block；The input termination input signal of input impedance matching module or input impedance matching and power attenuation module, multiple computings are put
The input of big module is connected respectively with the outfan of input impedance matching module or input impedance matching and power attenuation module,
The outfan of multiple operation amplifier modules is connected respectively with the input of load Sharing module, and load Sharing module output termination is defeated
Go out signal；Bias-adjusted module is arranged on before multiple operation amplifier modules；
Bias-adjusted module includes adjustable resistance, current-limiting resistance and the input impedance resistance being sequentially connected in series, and adjustable resistance is another
One termination positive voltage or negative voltage, input impedance resistance other end ground connection.
Further, bias-adjusted module is arranged on input impedance matching module or input impedance matching and power attenuation mould
Before block.
Further, bias-adjusted module is arranged on input impedance matching module or input impedance matching and power attenuation mould
After block.
Further, input impedance matching and power attenuation module include resistance R1 and drop-down at resistance R1 two ends respectively
The resistance R2 and resistance R3 of ground connection.
The invention has the beneficial effects as follows：
1st, this circuit solves passive device protection twinkling signal reflection using there is the technologies such as source protection, load Sharing
Problem, strengthens output signal driving force, effectively increases the input bandwidth of signal；
2nd, this circuit output signal dynamic range is big, and input/output signal ratio is 1:1, out-put dynamic range ± (2mV-
10V)；
3rd, when input signal amplitude is more than ± 10V, stable output signal is in ± 10V, and signal top flat is good, defeated
Go out punching, undershoot on signal little；
4th, bias-adjusted module is added after signal power decay, in actual applications can be inclined with quick regulation signal
Put.
Description of the drawings
Fig. 1 is embodiment of the present invention schematic block circuit diagram；
Fig. 2 is embodiment input impedance matching and power attenuation module circuit diagram；
Fig. 3 is embodiment bias-adjusted module circuit diagram；
Fig. 4 is embodiment operation amplifier module circuit diagram；
Fig. 5 is embodiment load Sharing module circuit diagram.
Specific embodiment
The present invention is described in detail with reference to specific embodiments and the drawings.
A kind of Larger Dynamic scope oscillograph input channel active protective circuit is present embodiments provided, more particularly to it is a kind of defeated
Enter the Ω of impedance 50, measurement Larger Dynamic scope, the oscillograph channel guard of Fast-Pulse Measuring.
Embodiment circuit theory is as shown in figure 1, mainly include input impedance matching and power attenuation module U1, bias-adjusted
Module U2, operation amplifier module U3, load Sharing module U4.
Input impedance matching and power attenuation module U1 carry out impedance matching and power attenuation to input signal；Bias-adjusted
Module U2 is to the signal bias-adjusted after power attenuation；Signal after bias-adjusted distributes to two to operation amplifier module U3
Operational amplification circuit, operational amplifier can select low noise high bandwidth Voltage Feedback integrated operational amplifier or low noise sound pitch
Bandwidth current feeds back integrated operational amplifier；The output signal of two operational amplification circuits enters load Sharing module U4, passes through
Adjust power attenuation, load resistance, feedback resistance, gain resistor and receiving terminal input impedance, it is ensured that input signal and output letter
Amplitude linearity between number；
Input impedance matching and power attenuation module U1 are as shown in Fig. 2 including resistance R1 and respectively at resistance R1 two ends
The resistance R2 and resistance R3 of drop-down ground connection, by input signal impedance matching is carried out, 2 times of power attenuation, for the Ω of input impedance 50,
The situation that 2 times of power attenuation, R1=37 Ω, R2=R3=150 Ω；
Bias-adjusted module U2 is as shown in figure 3, including adjustable resistance, the current-limiting resistance and input impedance electricity being sequentially connected in series
Resistance, another termination positive voltage of adjustable resistance or negative voltage, input impedance resistance other end ground connection.Bias-adjusted module U2 can be right
Signal bias voltage carries out positive negative regulator, and range of accommodation is input into by generating positive and negative voltage, Radj adjustable resistances, R0 current-limiting resistances and 50 Ω
Impedance resistors are together decided on, adjust Radj can adjust the bias voltage for entering into power attenuation signal, when Radj resistance it is too small
When, R0 current-limiting resistances can limit the bias voltage for entering into power attenuation signal, prevent bias voltage excessive, burn out computing and put
Big circuit part；
Operation amplifier module U3 two operational amplification circuits as shown in figure 4, be made up of, its gain amplifier is adjusted by RF, RG
Section, the operational amplifier for being adopted is THS3001 or THS3091；
Load Sharing module U4 as shown in figure 5, be made up of series resistance RS1, RS2 and load resistance RL etc., by adjusting
RS1, RS2 resistance adjusts partial pressure of output signal U out1, Uout2 at Uout；
When input signal power is decayed to, 2, two same type operational amplification circuit output loadings are shared, RT1=RT2=
When RT, RF1=RF2=RF, RG1=RG2=RG, RS1=RS2=RS, following relation is obtained：Uout1=Uout2=1/2 ×
Uin×(1+RF/RG)；
Uout=2 × Uout1 × { (RS//RL)/[(RS//RL)+RS] }
=Uin × (1+RF/RG) × { (RS//RL)/[(RS//RL)+RS] }
To ensure the bandwidth of operational amplification circuit and ensureing low noise, the RF recommended using operational amplifier device handbook
Value, RL values are, it is known that the value by adjusting RS and RG, makes Uin=Uout；The value of RS, RG is comprehensively determined, including the input of amplifier
The combined factors such as bandwidth, the amplification of amplifier, amplifier output driving ability are limited；
Likewise, for other input impedance matching and power attenuation, the output loading of N number of same type operational amplification circuit are total to
Situations such as enjoying, it is first determined RF, RL value, analogizes according to above formula, draws RS, RG value.
In addition, the input bandwidth in order to increase protection circuit, it is also possible to only carry out impedance matching to input signal, do not carry out
Power attenuation, input impedance matching module adopts existing known circuits.
Claims (4)
1. a kind of Larger Dynamic scope oscillograph input channel active protective circuit, it is characterised in that：Including input impedance matching mould
Block or input impedance matching and power attenuation module, bias-adjusted module, multiple operation amplifier modules, load Sharing module；It is defeated
Enter the input termination input signal of impedance matching module or input impedance matching and power attenuation module, multiple operation amplifier modules
Input be connected with the outfan of input impedance matching module or input impedance matching and power attenuation module respectively, Duo Geyun
The outfan for calculating amplification module is connected respectively with the input of load Sharing module, load Sharing module output termination output letter
Number；Bias-adjusted module is arranged on before multiple operation amplifier modules；
Bias-adjusted module includes adjustable resistance, current-limiting resistance and the input impedance resistance being sequentially connected in series, the adjustable resistance other end
Connect positive voltage or negative voltage, input impedance resistance other end ground connection.
2. Larger Dynamic scope oscillograph input channel active protective circuit according to claim 1, it is characterised in that：Bias-adjusted
Module is arranged on before input impedance matching module or input impedance matching and power attenuation module.
3. Larger Dynamic scope oscillograph input channel active protective circuit according to claim 1, it is characterised in that：Bias-adjusted
Module is arranged on after input impedance matching module or input impedance matching and power attenuation module.
4. according to the Larger Dynamic scope oscillograph input channel active protective circuit of Claims 2 or 3, it is characterised in that：Input
Impedance matching and power attenuation module include resistance R1 and respectively in the resistance R2 and resistance R3 of the drop-down ground connection in resistance R1 two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611163254.0A CN106680558B (en) | 2016-12-15 | 2016-12-15 | A kind of Larger Dynamic range oscillograph input channel active protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611163254.0A CN106680558B (en) | 2016-12-15 | 2016-12-15 | A kind of Larger Dynamic range oscillograph input channel active protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106680558A true CN106680558A (en) | 2017-05-17 |
| CN106680558B CN106680558B (en) | 2019-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611163254.0A Active CN106680558B (en) | 2016-12-15 | 2016-12-15 | A kind of Larger Dynamic range oscillograph input channel active protective circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202691A (en) * | 2017-08-03 | 2017-09-26 | 深圳市山水动力科技有限公司 | EGR valve detector |
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|---|---|---|---|---|
| US5654647A (en) * | 1995-02-03 | 1997-08-05 | Hewlett-Packard Company | Multiple lead voltage probe and method of making same |
| CN201199245Y (en) * | 2008-04-30 | 2009-02-25 | 优利德科技(成都)有限公司 | Analog channel for digital oscilloscope |
| CN203465330U (en) * | 2013-07-08 | 2014-03-05 | 东莞市路晨电子科技有限公司 | Oscilloscope front-end processing circuit |
| CN203617973U (en) * | 2013-12-30 | 2014-05-28 | 哈尔滨理工大学 | Low-power consumption wideband amplification circuit for handheld digital scopemeter |
| CN105116362A (en) * | 2015-08-26 | 2015-12-02 | 电子科技大学 | Oscilloscope simulation front end impedance conversion circuit having program control correction function |
-
2016
- 2016-12-15 CN CN201611163254.0A patent/CN106680558B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5654647A (en) * | 1995-02-03 | 1997-08-05 | Hewlett-Packard Company | Multiple lead voltage probe and method of making same |
| US5940965A (en) * | 1995-02-03 | 1999-08-24 | Hewlett-Packard Company | Method of making multiple lead voltage probe |
| CN201199245Y (en) * | 2008-04-30 | 2009-02-25 | 优利德科技(成都)有限公司 | Analog channel for digital oscilloscope |
| CN203465330U (en) * | 2013-07-08 | 2014-03-05 | 东莞市路晨电子科技有限公司 | Oscilloscope front-end processing circuit |
| CN203617973U (en) * | 2013-12-30 | 2014-05-28 | 哈尔滨理工大学 | Low-power consumption wideband amplification circuit for handheld digital scopemeter |
| CN105116362A (en) * | 2015-08-26 | 2015-12-02 | 电子科技大学 | Oscilloscope simulation front end impedance conversion circuit having program control correction function |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202691A (en) * | 2017-08-03 | 2017-09-26 | 深圳市山水动力科技有限公司 | EGR valve detector |
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| CN106680558B (en) | 2019-02-05 |
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