CN103185821B - Digital oscilloscope with front end attenuation function - Google Patents
Digital oscilloscope with front end attenuation function Download PDFInfo
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- CN103185821B CN103185821B CN201110448945.6A CN201110448945A CN103185821B CN 103185821 B CN103185821 B CN 103185821B CN 201110448945 A CN201110448945 A CN 201110448945A CN 103185821 B CN103185821 B CN 103185821B
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- attenuation units
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Abstract
The invention discloses a digital oscilloscope with a front end attenuation function, which comprises a signal input end, a straight-through attenuation switching module, a front end amplification module, an A/D (analog/digital) conversion module and a control processing module that are connected in series sequentially, wherein the straight-through attenuation switching module responses to a control signal of the control processing module; an attenuation unit is connected between the signal input end and the front end amplification module; the digital oscilloscope further comprises an RC (resistor-capacitor) frequency compensation circuit; the straight-through attenuation switching module responses to the control signal of the control processing module; and the attenuation unit and the RC frequency compensation circuit are connected between the signal input end and the front end amplification module in parallel. According to the digital oscilloscope, under the condition that the cost is not increased, the bandwidths of vertical gears at high frequency are basically the same, and the digital oscilloscope is simple in structure and easy to realize.
Description
Technical field
The present invention relates to digital oscilloscope field, more particularly to the digital oscilloscope of front end attenuation function.
Background technology
With reference to Fig. 1, in prior art, digital oscilloscope 1 generally includes the signal input part 11 being sequentially connected in series, and leads directly to
The ohms impedance match resistance 13 of decay switching module 12,50, front end amplification module 14, A/D modular converters 15 and control process list
Unit 16, signal input part 11 receives analogue signal to be measured, and straight-through decay switching module 12 is used to decline analogue signal to be measured
Down control, leading directly to decay switching module 12 includes straight-through unit 121 and attenuation units 122, when the little vertical gear of user input,
The vertical gear that control process unit 16 is arranged according to user, control signal input 11 is connected with straight-through unit 121, and signal is straight
Output is connect to 50 ohms impedance match resistance 13；When the big vertical gear of user input, control process unit 16 sets according to user
The vertical gear put, control signal input 11 is connected with attenuation units 122, and signal is exported to 50 ohmages after decay
Build-out resistor 13；The signal of the output of straight-through decay switching module 12 sends into front end and amplifies mould through 50 ohms impedance match resistance 13
Block 14, front end amplification module 14 is amplified after process to signal, and giving A/D modular converters 15 carries out analog digital conversion, generates number
Word signal, control process unit 16 generates shape information according to the input control information of user, and in oscillographic display screen
Upper display.In the prior art, 50 ohms impedance match resistance 13 are generally used for realizing the matching of input impedance.
With reference to reference to Fig. 1 and Fig. 2, in prior art, straight-through decay is entered by signal input part 11 in high-frequency signal and is cut
During mold changing block 12, because attenuation units 122 have the reasons such as input Insertion Loss, cause frequency of the attenuation units 122 to high-frequency signal
Response curve f1 is inconsistent to the frequency response curve f2 of high-frequency signal with straight-through unit 121, as can be known from Fig. 2, amplitude for-
During 3dB, the bandwidth B 2 of the bandwidth B 1 of f1 than f2 is little, is understanding so as to cause the inconsistent of the vertical gear bandwidth of digital oscilloscope 1
Certainly problem above, it is necessary to from the decay relay or attenuator of high bandwidth, but such decay relay or decay
Piece is not only expensive, and is difficult buying, and institute in this way increases cost, is not easily accomplished again.
The content of the invention
In order to solve the problems, such as prior art, the present invention proposes a kind of digital oscillography with front end attenuation function
Device.
A kind of digital oscilloscope with front end attenuation function of the present invention, it is defeated including the signal being sequentially connected in series
Enter end, lead directly to decay switching module, front end amplification module, A/D modular converters and control process module, described straight-through decay is cut
The control signal of the described control process unit of mold changing block response, by an attenuation units be connected to described signal input part and
Between the amplification module of front end, also including a RC frequency compensated circuit, the described control of described straight-through decay switching module response
The control signal of processing unit processed, while described attenuation units and described RC frequency compensated circuits are connected in parallel described
Signal input part and described front end amplification module between.
In digital oscilloscope of the present invention, described straight-through decay switching module can also be connected to including one
Relay between described signal input part and described front end amplification module, it has the one of the described attenuation units of connection
Docking point, described RC frequency compensated circuits can also be connected between a described docking point, and with described attenuation units
Input press close to install.
In digital oscilloscope of the present invention, described relay can also include built-in attenuation units by one
Decay relay is constituted, and it has the docking point being connected with the input and outfan of the built-in attenuation units respectively, institute
Stating RC frequency compensated circuits can also be connected in parallel with a described docking point, and with the input of described built-in attenuation units
Press close to install.
In digital oscilloscope of the present invention, the straight-through decay switching module can also include a relay,
It has the input contact for connecting the signal input part, connects the output contact of the input of the front end amplification module；Institute
The RC frequency compensated circuits stated can also be connected between the input contact of described relay and output contact, and with it is described
The input of attenuation units is pressed close to install.
In digital oscilloscope of the present invention, the straight-through decay switching module can also include built-in declining by one
The decay relay for subtracting unit is constituted, and it has the input contact for connecting the signal input part, and the described front end of connection is amplified
The output contact of the input of module.
In digital oscilloscope of the present invention, described RC frequency compensated circuits can also be by a resistance and one
Capacitances in series connection composition.
In digital oscilloscope of the present invention, described straight-through decay switching module and described front end amplification module
Between can also have one 50 ohm of impedance matching resistor.
, in the case where cost is not increased, the bandwidth of vertical gear is basic when making high frequency for digital oscilloscope of the present invention
Unanimously, and simple structure, it is easy to accomplish.
Description of the drawings
Fig. 1 is the structural representation of digital oscilloscope 1 in prior art.
Fig. 2 is the schematic diagram of the frequency response curve that unit 121 and attenuation units 122 are led directly in prior art.
Fig. 3 is the structural representation of digital oscilloscope 2 in the embodiment of the present invention.
Fig. 4 is the structural representation of RC frequency compensated circuits 224 and attenuation units 223 in embodiment.
Fig. 5 is the schematic diagram of the frequency response curve of RC frequency compensated circuits 224 and attenuation units 223 in embodiment.
Fig. 6 is the structural representation of digital oscilloscope 2 in another embodiment.
Fig. 7 is the structural representation at the PCB back sides in digital oscilloscope 2 in embodiment.
Specific embodiment
A preferred embodiment of the present invention is introduced below in conjunction with the accompanying drawings.
With reference to Fig. 3, digital oscilloscope 2 includes the signal input part 21 being sequentially connected in series, and leads directly to decay switching module 22,
50 ohms impedance match resistance 23, front end amplification module 24, A/D modular converters 25 and control process module 26, signal input part
21 are used to receive analogue signal to be measured, and straight-through decay switching module 22 is used to carry out adjustable attenuation to analogue signal to be measured, leads directly to
Decay switching module 22 includes straight-through unit 221 and attenuation units 223, when the little vertical gear of user input, control process mould
The vertical gear that block 26 is arranged according to user, control signal input 21 is connected with straight-through unit 221, and signal is directly output to 50
Ohms impedance match resistance 23；When the big vertical gear of user input, the vertical shelves that control process module 26 is arranged according to user
Position, control signal input 21 is connected with attenuation units 223, and signal is exported to 50 ohms impedance match resistance after decay
23；The signal of the output of straight-through decay switching module 22 sends into front end amplification module 24 through 50 ohms impedance match resistance 23, front
End amplification module 24 is amplified after process to signal, and giving A/D modular converters 25 carries out analog digital conversion, generates digital signal,
Control process module 26 generates shape information according to the input information of user, and shows on the display screen.50 ohmages
It is generally used for realizing the matching of input impedance with resistance 23.
In the present embodiment, leading directly to decay switching module 22 also includes a RC frequency compensated circuit 224, works as user input
During big vertical gear, control signal of the decay switching module 22 according to control process module 26 is led directly to, while by attenuation units 223
And RC frequency compensated circuits 224 are connected between signal input part 21 and front end amplification module 24.
With reference to Fig. 4, RC frequency compensated circuits 224 are used for when analogue signal to be measured is high-frequency signal, to attenuation units 223
Bandwidth compensate, in the present embodiment, RC frequency compensated circuits 224 are composed in series by a resistance R1 and electric capacity C1, its
Operation principle is that, when attenuation units 223 are equivalent to be made up of resistance R2, R3 and R4, the impedance of RC frequency compensated circuits 224 is
The parallel impedance of X1=1/ (2 π fC1)+R1, X1 and R3 is parallel impedance X3 of X2,50 ohms impedance match resistance 23 and R4, because
The attenuation ratio of this attenuation units 223 is X2/X3.When frequency f of analogue signal to be measured increases, X1 diminishes, so as to parallel impedance
X2 diminishes, and because X3 is constant, attenuation ratio reduces, so the voltage increase on 50 Ω impedance matching resistors 23, before the voltage is
The input voltage of end amplification module 24.So when the frequency of analogue signal to be measured increases, on 50 Ω impedance matching resistors 23
Voltage also becomes big, but because attenuation units 223 have the reasons such as input Insertion Loss, causes when the frequency of analogue signal to be measured increases
When, the output of attenuation units 223 diminishes, so it is big with frequency change to solve attenuation units 223 to need RC frequency compensated circuits 224
The problem that output diminishes.By taking 1GHz bandwidth digital oscillographs as an example, if the input Insertion Loss that 1GHz brings is 1dB, that is, decay single
223 1dBs less than the output of straight-through unit 221 of unit, at this moment need to make 50 ohms impedance match electricity by RC frequency compensation networks 224
Partial pressure value increase 1dB in resistance 23 is input into the decay that Insertion Loss causes to compensate, that is, the value for needing impedance X2 and R3 meets 20*
Lg (X2/R3)=- 1dB, so as to the value of R1 and C1 in by being derived by RC frequency compensated circuits 224.
It is V1 with reference to the frequency response curve with reference to Fig. 3 and Fig. 5, RC frequency compensated circuit 224, the frequency of attenuation units 223
Rate response curve is V2, and V3 is the straight line obtained after V1 and V2 superpositions, it can be seen that RC frequency compensated circuits 224 compensate for
The bandwidth decay of attenuation units 223.So cause the frequency response curve of attenuation units 223 and straight-through unit 221 basically identical,
So that the bandwidth of vertical gear is consistent.
As an example, RC frequency compensated circuits 224 can also adopt the electricity that multiple resistance and electric capacity connection in series-parallel are constituted
Road is constituted, or the circuit that electric capacity and inductance are composed in series can be adopted to constitute, or can also adopt resistance, electric capacity and inductance
The circuit being composed in series is constituted.
With reference to Fig. 3, in the present embodiment, leading directly to decay switching module 22 includes a relay 222, and relay 222 has
There are contact D1, D2, D3, D4, input contact In and output contact Out, input contact In is used to connect signal input part 21, exports
Contact Out is used to connect the input of front end amplification module, and RC frequency compensated circuits are connected between contact D1 and contact D2, when
During the little vertical gear of user input, straight-through unit 221 is connected to signal input by control contact D3 of control process module 26 and D4
End 21 and front end amplification module 24；When the big vertical gear of user input, control contact D1 of control process module 26 and D2 are simultaneously
Attenuation units 223 and RC frequency compensated circuits 224 are connected between signal input part 21 and front end amplification module 24, to be measured
When analogue signal is high-frequency signal, RC frequency compensated circuits 224 are used to compensate the bandwidth decay of attenuation units 223.
With reference to Fig. 6, as an example, RC frequency compensated circuits 224 can also be connected to input contact In and output connects
Between point Out, when analogue signal to be measured is high-frequency signal, RC frequency compensated circuits 224 are used to compensate the band of attenuation units 223
Width decay.
In the present embodiment, attenuation units 223 and the common decay relay by a built-in attenuation units of relay 222
Constitute, it has docking point In, the Out being connected with the input and outfan of built-in attenuation units 223 respectively, RC frequencies are mended
Repay circuit 224 to be connected in parallel with docking point In, an Out.
As an example, attenuation units 223 can be being made up of rf attenuation piece or resistance decrement network.
In the present embodiment, RC frequency compensated circuits 224 are arranged near the input of attenuation units 223, with reference to Fig. 7,
Relay 222 at the back side of pcb board there are 6 to be installed via P1, P2, P3, P4, P5 and P6, wherein P3 connection attenuation units 223
Input, RC frequency compensated circuits 224 are connected in the middle of P3 and P4, and R1 with a distance from P3 less than C1 with a distance from P4, with
Make the input cabling of attenuation units 223 as far as possible short, reduce stray inductance, it is to avoid the higher-order of oscillation.
Above-described is only the specific embodiment of the present invention, and the protection domain being not intended to limit the present invention is all at this
Within the spirit and principle of invention, any modification, equivalent substitution and improvements done etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (7)
1. a kind of digital oscilloscope with front end attenuation function,
Including the signal input part being sequentially connected in series, lead directly to decay switching module, front end amplification module, A/D modular converters and
Control process module,
The control signal of the described control process module of described straight-through decay switching module response, an attenuation units are connected
Between described signal input part and front end amplification module,
Characterized in that,
Also include a RC frequency compensated circuit,
The control signal of the described control process module of described straight-through decay switching module response, while by described decay list
The entirety and described RC frequency compensated circuits of unit is connected in described signal input part and described front end amplification module in parallel
Between.
2. digital oscilloscope according to claim 1, it is characterised in that described straight-through decay switching module includes
The relay between signal input part and described front end amplification module described in being connected to, described relay has connection institute
One docking point of the attenuation units stated, described RC frequency compensated circuits are connected between a described docking point, and with it is described
Attenuation units input press close to install.
3. digital oscilloscope according to claim 2, it is characterised in that described relay is to include built-in attenuation units
Decay relay, the attenuation units be decay relay built-in attenuation units.
4. digital oscilloscope according to claim 1, it is characterised in that the straight-through decay switching module include one after
Electrical equipment, it has the input contact for connecting the signal input part, and the output for connecting the input of the front end amplification module connects
Point；
Described RC frequency compensated circuits are connected between the input contact of described relay and output contact, and with it is described
The input of attenuation units is pressed close to install.
5. digital oscilloscope according to claim 4, it is characterised in that the relay is to include built-in attenuation units
Decay relay, the attenuation units are the built-in attenuation units of decay relay.
6. the digital oscilloscope according to claim 3 or 5, it is characterised in that described RC frequency compensated circuits are by
Resistance and a capacitances in series connection composition.
7. digital oscilloscope according to claim 6, it is characterised in that described straight-through decay switching module with it is described
There is one 50 ohm of impedance matching resistor between the amplification module of front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110448945.6A CN103185821B (en) | 2011-12-29 | 2011-12-29 | Digital oscilloscope with front end attenuation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110448945.6A CN103185821B (en) | 2011-12-29 | 2011-12-29 | Digital oscilloscope with front end attenuation function |
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| Publication Number | Publication Date |
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| CN103185821A CN103185821A (en) | 2013-07-03 |
| CN103185821B true CN103185821B (en) | 2017-04-19 |
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| CN201110448945.6A Active CN103185821B (en) | 2011-12-29 | 2011-12-29 | Digital oscilloscope with front end attenuation function |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391151B (en) * | 2014-11-25 | 2017-03-15 | 江苏福克斯新能源科技有限公司 | A kind of oscillograph based on triple amplifying circuits |
| CN104391149A (en) * | 2014-11-25 | 2015-03-04 | 苏州立瓷电子技术有限公司 | Oscilloscope with sectional amplifier circuit |
| CN104374973A (en) * | 2014-11-25 | 2015-02-25 | 苏州立瓷电子技术有限公司 | Oscilloscope based on simple pre-amplification circuit |
| CN106932627A (en) * | 2015-12-29 | 2017-07-07 | 苏州普源精电科技有限公司 | A kind of probe circuit |
| CN108761162A (en) * | 2018-05-04 | 2018-11-06 | 四川斐讯信息技术有限公司 | A kind of oscilloprobe control system and method |
| CN111289787B (en) * | 2020-05-13 | 2020-08-25 | 深圳市鼎阳科技股份有限公司 | Digital oscilloscope and automatic calibration device and method for channel attenuation compensation thereof |
| CN111879989B (en) * | 2020-05-21 | 2022-07-12 | 西安交通大学 | Current detection circuit suitable for SiC MOSFET |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5172051A (en) * | 1991-04-24 | 1992-12-15 | Hewlett-Packard Company | Wide bandwidth passive probe |
| US8278940B2 (en) * | 2009-09-30 | 2012-10-02 | Tektronix, Inc. | Signal acquisition system having a compensation digital filter |
| CN102053183B (en) * | 2009-11-10 | 2015-04-22 | 北京普源精电科技有限公司 | Digital oscilloscope with impedance matching function |
| CN102053172B (en) * | 2009-11-10 | 2012-11-14 | 北京普源精电科技有限公司 | High-resistance broadband attenuation circuit and oscilloscope using same |
| CN101776703B (en) * | 2009-12-25 | 2012-12-26 | 北京普源精电科技有限公司 | Oscilloscope provided with attenuator circuit |
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