CN101776703B - Oscilloscope provided with attenuator circuit - Google Patents
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- CN101776703B CN101776703B CN 200910243120 CN200910243120A CN101776703B CN 101776703 B CN101776703 B CN 101776703B CN 200910243120 CN200910243120 CN 200910243120 CN 200910243120 A CN200910243120 A CN 200910243120A CN 101776703 B CN101776703 B CN 101776703B
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Abstract
The invention relates to an oscilloscope provided with an attenuator circuit, which comprises a signal input module, an input attenuation module, a programmable amplifier, a bandwidth limit module, an ADC driving module, an A/D conversion module, a control processing module and a D/A conversion module which are sequentially connected with each other in series, wherein the input attenuation module comprises a resistance-capacitance network provided with a plurality of branch circuits, a switch unit and an operational amplifier unit which are sequentially connected with each other in series, wherein the operational amplifier unit comprises a compensating network, and the control processing module can realize the adjustment of frequency response of an input signal of the oscilloscope by using the compensating network. By adopting the controllable compensating network, the frequency response of the input signal of the oscilloscope can be adjusted, and thereby the invention has good flatness on the frequency response.
Description
Technical field
The present invention relates to show the measurement mechanism field of electric variable, specially refer to the digital oscilloscope field with the waveform mode.
Background technology
In the digital oscilloscope commonly used, generally comprise analog front circuit, ADC sample circuit, trigger circuit, digital processing circuit and display circuit.Wherein analog front circuit is accomplished input high resistant, the buffering to the input measured signal, decay and ADC driving or the like a series of function.And how when realizing the input high resistant, also can realize many ratios decay to input signal, be puzzlement technician's problem always.
In the prior art, with reference to Fig. 1, digital oscilloscope 1 comprises the signal input module 10 of series connection successively; Input resistance 11, input attenuation module 12, programmable amplifier 13; Bandwidth constraints module 14; ADC driver module 15, A/D modular converter 16 and control treatment module 17, and be connected on the D/A modular converter 18 between control treatment module 17 and the input attenuation module 12.
Signal is by signal input part 101 inputs, and process AC/DC converting unit 102 is connected to the grid of technotron 121, and AC/DC converting unit 102 is made up of switch of an electric capacity parallel connection; Realize the switching of AC/DC; The grid of technotron 121 connects 1M Ω resistance 11 to ground, and the drain electrode of technotron 121 connects power supply VCC, and source electrode is through resistance 123 ground connection; Source electrode is connected to an input end of adding circuit 122 simultaneously; Another input end of adding circuit 122 connects D/A modular converter 18, is used to control inner direct current biasing, and the output of adding circuit 122 is connected to programmable amplifier 13; Programmable amplifier 13 outputs are connected to bandwidth constraints module 14; 14 outputs of bandwidth constraints module are connected to ADC driver module 15, and ADC driver module 15 output signals are sent into A/D modular converter 16 and carried out analog to digital conversion, are admitted to control treatment module 17 through the signal after the analog to digital conversion; Control treatment module 17 outputing gain control signals are given programmable amplifier 13, the enlargement factor of control figure programmable amplifier 13.Control treatment module 17 is gone back the bandwidth of output bandwidth restricting signal control bandwidth limiting module 14.
It is thus clear that; In the prior art; In order to realize importing high resistant and, be that the 1M Ω resistance 11 through ground connection inserts input attenuation module 12 with input signal, then to the decay of input signal; The decay that realizes signal through technotron 121 and adding circuit 122 again, mainly there are following two problems in above method:
1, the dynamic range owing to input signal is determined by the grid of technotron fully; And owing to realize the input high resistant through 1M Ω resistance 11 ground connection; Have only a path to be connected with FET, can not realize many ratio decay, the above all causes the signal input dynamic range very little;
2, because the frequency response flatness of technotron is poor, and there are not other circuit structures that is used for the regulating frequency response, so cause the frequency response flatness of signal relatively poor.
Summary of the invention
The present invention provides a kind of oscillograph with attenuator circuit in order to solve first problem that exists in the prior art.
Described a kind of oscillograph with attenuator circuit; Comprise a signal input module of series connection successively; An input attenuation module, a control treatment module, described input attenuation module comprise a resistance-capacitance network, a switch element and amplifier unit of series connection successively; Described resistance-capacitance network comprises a plurality of resistance-capacitance circuits; The input end of each resistance-capacitance circuit all is connected with the output terminal of described signal input module, and described switch element is used to select any output terminal of described resistance-capacitance network to be connected with described amplifier unit, and makes other output head groundings of described resistance-capacitance network.
In oscillograph of the present invention, in described a plurality of resistance-capacitance circuits, have at least a resistance-capacitance circuit can comprise a resistance and the circuit that electric capacity composes in parallel.
In oscillograph of the present invention; In described a plurality of resistance-capacitance circuit; Have at least a resistance-capacitance circuit can comprise two output terminals; And comprise first circuit, second circuit and tertiary circuit; Described first circuit and described second circuit are connected between the input end and an output terminal of described resistance-capacitance circuit, and described first circuit and described tertiary circuit are connected between the input end and another output terminal of described resistance-capacitance circuit, and described first circuit, second circuit and tertiary circuit all are by a resistance and the circuit that electric capacity composes in parallel.
In oscillograph of the present invention; Described amplifier unit can comprise an operational amplifier; Described operational amplifier has a positive input terminal, a negative input end and an output terminal; The positive input terminal of described operational amplifier is used for ground connection, and the negative input end of described operational amplifier is used to connect described switch element, and between the negative input end of described operational amplifier and output terminal, is connected with a feedback resistance.
In oscillograph of the present invention, can be parallel with a compensating circuit at the two ends of said feedback resistance.
In oscillograph of the present invention, described compensating circuit can be connected in series by a compensating resistance and a building-out capacitor and form.
In oscillograph of the present invention, described compensating circuit can comprise a varactor that is connected in parallel on the two ends of described feedback resistance, and described control treatment module is connected with the control end of described varactor through a D/A modular converter.
In oscillograph of the present invention, described compensating circuit can comprise a varactor that is connected in parallel on the two ends of described feedback resistance, and described control treatment module is connected with the control end of described varactor through described D/A modular converter.Oscillograph of the present invention not only can reach the requirement of oscillographic input high resistant, and can realize the decay of a plurality of ratios to input signal, enlarges the dynamic range of input signal.
The present invention provides another kind of oscillograph with attenuator circuit in order to solve second problem that exists in the prior art.
Described a kind of oscillograph with attenuator circuit; Comprise a signal input module of series connection successively; An input attenuation module; A control treatment module, described input attenuation module comprises an operational amplifier that is connected between its input end and the output terminal, described operational amplifier has a positive input terminal that is used for ground connection and one be used to the to be connected in series negative input end of input end of said input attenuation module; Between the output terminal of described operational amplifier and described negative input end, be connected with a corrective network that receives described control treatment module control, described corrective network is used to regulate the frequency characteristic of described operational amplifier.
In oscillograph of the present invention; Described corrective network can comprise a varactor, first electric capacity, second electric capacity, first current-limiting resistance and one second current-limiting resistance; Described first capacitances in series is between the input end of the negative pole of described varactor and described corrective network; Described second capacitances in series is between the output terminal of the anodal and described corrective network of described varactor; The first described current-limiting resistance is connected between the negative pole and described control treatment module of described varactor, between the positive pole and ground of the described varactor of described second current-limiting resistance series connection.
In oscillograph of the present invention, the compensating resistance of between the input end of described corrective network and output terminal, can connecting.
In oscillograph of the present invention, described control treatment module can be controlled described corrective network through a D/A modular converter.
In oscillograph of the present invention, in described a plurality of resistance-capacitance circuits, have at least a resistance-capacitance circuit can comprise the circuit that composes in parallel of resistance and an electric capacity.
In oscillograph of the present invention; In described a plurality of resistance-capacitance circuit; Have at least a resistance-capacitance circuit can comprise two output terminals; And comprise first circuit, second circuit and tertiary circuit; Described first circuit and described second circuit are connected between the input end and an output terminal of described resistance-capacitance circuit, and described first circuit and described tertiary circuit are connected between the input end and another output terminal of described resistance-capacitance circuit, and described first circuit, second circuit and tertiary circuit all are by a resistance and the circuit that electric capacity composes in parallel.
In oscillograph of the present invention, in described a plurality of resistance-capacitance circuits, have at least a resistance-capacitance circuit can comprise the circuit that composes in parallel of resistance and an electric capacity.
In oscillograph of the present invention; In described a plurality of resistance-capacitance circuit; Have at least a resistance-capacitance circuit can comprise two output terminals; And comprise first circuit, second circuit and tertiary circuit; Described first circuit and described second circuit are connected between the input end and an output terminal of described resistance-capacitance circuit, and described first circuit and described tertiary circuit are connected between the input end and another output terminal of described resistance-capacitance circuit, and described first circuit, second circuit and tertiary circuit all are by a resistance and the circuit that electric capacity composes in parallel.
In oscillograph of the present invention, between the negative input end of described operational amplifier and output terminal, can connect a feedback resistance.
Oscillograph of the present invention through the frequency response of corrective network regulating circuit, makes that the frequency response flatness of circuit is better.
Description of drawings
Fig. 1 is the structural representation of digital oscilloscope in the prior art.
Fig. 2 is the structural representation of digital oscilloscope 2 among first embodiment.
Fig. 3 is the structural representation of digital oscilloscope 3 among second embodiment.
Fig. 4 is the structural representation of corrective network 3120 among second embodiment.
Embodiment
Introduce the first embodiment of the present invention below in conjunction with accompanying drawing 2.
As shown in Figure 2, digital oscilloscope 2 comprise signal input module 20, input attenuation module 21, the signal processing module 22 that is connected in series successively and be connected on input attenuation module 21 and signal processing module 22 between D/A modular converter 28.
Signal input module 20 comprises signal input part, resistance 202 and the AC/DC converting unit of series connection successively; Signal input part is made up of connector 201; The AC/DC converting unit is made up of electric capacity 203 and switch 204 parallel connections, and electric capacity 203 is 47nF, and switch 204 is cmos analog switch KAQY214S.Input signal is sent into the AC/DC converting unit by connector 201 inputs through resistance 202, and when switch 204 closures, electric capacity 203 is by short circuit; Signal directly passes through, and is the DC coupling mode, when switch 204 breaks off; Signal directly flows through electric capacity 203, and direct current is isolated, and is the AC coupling mode.Signal through after the AC/DC conversion is given input attenuation module 21.
In the present embodiment, resistance 2101=1.05M Ω, electric capacity 2102=15pF, resistance 2103=18.8M Ω; Electric capacity 2104=0.6pF, feedback resistance=464k Ω, compensating resistance 2123=34.65M Ω; Building-out capacitor 2122=27pF, resistance 2125=249k Ω, filter capacitor 2126=100nF.
In the present embodiment, control treatment module 27 transmits control signal to switch 2111, and the output terminal Out of CS 2111 is connected with its input end In1; Input end In2 is through the acquiescence resistance eutral grounding; The positive input terminal ground connection of operational amplifier 2121 the output terminal Out1 of resistance-capacitance network 210 is connected, owing to can be known according to the empty short empty disconnected principle of operational amplifier with the negative input end In-of operational amplifier 2121; The output terminal Out1 ground connection of resistance-capacitance network 210; The output terminal Out2 of resistance-capacitance network 210 is ground level through the input end In2 ground connection of switch 2111 so can know two output terminals of resistance-capacitance network 210, because the parallel connection value of resistance 2101 and resistance 2103 approximates 1M Ω; So can know by the above; No matter which input end switch 2111 selects, and the input resistance of resistance-capacitance network 210 all equals 1M Ω, has realized that promptly the input resistance of oscillograph 2 is about 1M Ω.
In the present embodiment; Constitute attenuator circuit by resistance-capacitance network 210, switch element 211 and amplifier unit 212 to input signal; This attenuator circuit can be realized the attenuation ratio of two different gears; And resistance in the resistance-capacitance network 210 and electric capacity are respectively the major avenues of approach of low frequency signal and high-frequency signal, and the reciprocal proportion of resistance value ratio and capacitance is equal, in order to realize that high and low frequency is complementary.When switch 2111 makes the output terminal Out1 of resistance-capacitance network 210 be connected with the negative input end In-of operational amplifier 2121; Resistance 2101 or electric capacity 2102, operational amplifier 2121, feedback resistance 2124, compensating resistance 2123 and building-out capacitor 2122 composition attenuator circuits; When the input low frequency signal; Attenuation ratio approximates feedback resistance 2124/ resistance 2101 ≈ 1/2, and when input high-frequency signal, attenuation ratio approximates building-out capacitor 2122/ electric capacity 2102 ≈ 1/2; If this moment, input signal amplitude was V, the signal amplitude of operational amplifier 2121 outputs is exactly V/2 so; When switch 2111 makes the output terminal Out2 of resistance-capacitance network 210 be connected with the negative input end of operational amplifier 2121; Resistance 2103 or electric capacity 2104, operational amplifier 2121, feedback resistance 2124, compensating resistance 2123 and building-out capacitor 2122 composition attenuator circuits; When the input low frequency signal, attenuation ratio approximates feedback resistance 2124/ resistance 2103 ≈ 1/40, when input high-frequency signal; Attenuation ratio approximates building-out capacitor 2122/ electric capacity 2104 ≈ 1/40; If this moment, input signal amplitude was V, the signal amplitude of operational amplifier 2121 outputs is exactly V/40 so, has enlarged the dynamic range of input signal like this.
In the present embodiment, compensating resistance 2123 and building-out capacitor 2122 are used to regulate the frequency response of oscillograph input signal, because the frequency range of oscillographic input signal is bigger, can make the frequency response flatness of input signal good like this.
In the present embodiment; Control treatment module 27 output offset signal OFFSET give D/A modular converter 28; D/A modular converter 28 is given operational amplifier 2121 through resistance 2125 after converting signal OFFSET to simulating signal, is used to regulate the output end voltage of operational amplifier 2121, when input signal has bigger biasing; Can regulate OFFSET, make the output of operational amplifier 2121 in the operating voltage range that allows.Signal after operational amplifier 2121 decay is given signal processing module 22.
As further explanation; Resistance-capacitance network 210 in the present embodiment also can be made up of the resistance-capacitance circuit more than 2; Need select switch 2111 simultaneously for use, just can realize having the input attenuation circuit of more attenuation ratios, enlarge the dynamic range of input signal more with respective input.
As further explanation; Resistance 2101 in the present embodiment, electric capacity 2102, resistance 2103 and electric capacity 2104 can be by a plurality of resistance and a plurality of capacitances in series or parallel connection realizations; As long as resistance is satisfied the demand; And electric capacity can be selected tunable capacitor for use, can finely tune more convenient circuit debugging like this to the value of resistance and electric capacity.
As further explanation, the building-out capacitor 2122 in the present embodiment can be tunable capacitor
As further explanation; Corrective network in the present embodiment can be used tunable capacitor replacement compensating resistance 2123 and building-out capacitor 2122; And control treatment module 27 is sent control signal after D/A modular converter 28 converts simulating signal to according to the variation of attenuation ratio; Control this tunable capacitor, be used for the frequency response of regulating circuit, visible second embodiment of the concrete implementation of this corrective network.
Introduce the second embodiment of the present invention below in conjunction with accompanying drawing 3 and accompanying drawing 4.
As shown in Figure 3, digital oscilloscope 3 comprise signal input module 30, input attenuation module 31, the signal processing module 22 that is connected in series successively and be connected on input attenuation module 21 and signal processing module 22 between D/A modular converter 28.
Signal input module 30 comprises signal input part, resistance 202 and the AC/DC converting unit of series connection successively; And be in series with the parallel circuit of resistance 205 and electric capacity 206 in the back of AC/DC converting unit; Signal input part is made up of connector 201; The AC/DC converting unit is made up of electric capacity 203 and switch 204 parallel connections, and electric capacity 203 is 47nF, and switch 204 is cmos analog switch KAQY214S.Input signal is sent into the AC/DC converting unit by connector 201 inputs through resistance 202, and when switch 204 closures, electric capacity 203 is by short circuit; Signal directly passes through, and is the DC coupling mode, when switch 204 breaks off; Signal directly flows through electric capacity 203, and direct current is isolated, and is the AC coupling mode.Signal after the process AC/DC conversion is given the parallel circuit of resistance 205 and electric capacity 206, and signal is carried out giving input attenuation module 31 after the dividing potential drop.
Like Fig. 3 and shown in Figure 4; Corrective network 3120 is made up of varactor 31201, first electric capacity 31204, second electric capacity 31205, first current-limiting resistance 31202 and first current-limiting resistance 31203; First electric capacity 31204 is connected between the negative pole of feedback resistance 2124 and varactor 31201; Second electric capacity 31205 is connected between the positive pole of feedback resistance 2124 and varactor 31201; First current-limiting resistance 31202 is connected between the control end COMP of negative pole and corrective network 3120 of varactor 31201, and second current-limiting resistance 31203 is connected between the positive pole and ground of varactor 31201, and control end COMP is connected with D/A modular converter 28.
In the present embodiment, resistance 205=resistance 3103=resistance 3107=909k Ω, resistance 3101=resistance 3105=100k Ω; Electric capacity 206=500pF, electric capacity 3102=electric capacity 3106=100pF, electric capacity 3104=electric capacity 3108=12pF; Feedback resistance=464k Ω, the first electric capacity 31204=, the second electric capacity 31205=180pF, the first current-limiting resistance 31202=, the second current-limiting resistance 31203=2k Ω; Resistance 2125=249k Ω, filter capacitor 2126=100nF.
In the present embodiment, control treatment module 27 transmits control signal to switch 311, and the output terminal Out of CS 3111 is connected with input end In1; Input end In2 and In3 are through the acquiescence resistance eutral grounding; The positive input terminal In+ ground connection of operational amplifier 2121 the output terminal Out1 of resistance-capacitance network 310 is connected, owing to can be known according to the empty short empty disconnected principle of operational amplifier with the negative input end In-of operational amplifier 2121; The output terminal Out1 ground connection of resistance-capacitance network 310; The output terminal Out2 of resistance-capacitance network 310 and Out3 are ground level through the input end In2 and the In3 ground connection of switch 31111 so can know output terminal Out1, Out2 and the Out3 of resistance-capacitance network 310, because resistance 205+ resistance 3101|| (resistance 3103+ (resistance 3105|| resistance 3107)) ≈ 1M Ω; So can know by the above; No matter which input end switch 3111 selects, and the input resistance of resistance-capacitance network 310 all approximates 1M Ω, has realized that promptly the input resistance of oscillograph 3 is about 1M Ω.
In this first embodiment; Constitute attenuator circuit by resistance-capacitance network 310, switch element 311 and amplifier unit 312 to input signal; This attenuator circuit can be realized the decay of three different proportions; And resistance in the resistance-capacitance network 310 and electric capacity are respectively the major avenues of approach of low frequency signal and high-frequency signal, and the reciprocal proportion of resistance value ratio and capacitance equates, in order to realize that high and low frequency is complementary.Because the resistance 205 in signal input module 30 has carried out dividing potential drop one time to input signal; So if the amplitude of input signal is V; The voltage of resistance-capacitance network 310 input ends just becomes V/10 so, and when switch 3111 made the output terminal Out1 of resistance-capacitance network 310 be connected with the negative input end In-of operational amplifier 2121, resistance 3101 or electric capacity 3102, operational amplifier 2121 and feedback resistance 2124 constituted attenuator circuit; When the input low frequency signal; Attenuation ratio approximates feedback resistance 2124/ resistance 3101 ≈ 5, and when input high-frequency signal, attenuation ratio approximates electric capacity/electric capacity 3102 ≈ 5 of corrective network 3120; If this moment, input signal amplitude was V/10, the signal amplitude of operational amplifier 2121 outputs is exactly V/2 so; When switch 3111 makes the output terminal Out2 of resistance-capacitance network 310 be connected with the negative input end In-of operational amplifier 2121; Resistance 3103, resistance 3105 and 3107 pairs of signals of resistance have carried out dividing potential drop again one time at this moment; So resistance 3105 input voltages become V/100; Resistance 3105 or electric capacity 3106, operational amplifier 2121 and feedback resistance 2124 constitute attenuator circuit, and when the input low frequency signal, attenuation ratio approximates feedback resistance 2124/ resistance 3105 ≈ 5; When input high-frequency signal; Attenuation ratio approximates electric capacity/electric capacity 3106 ≈ 5 of corrective network 3120, if this moment, input signal amplitude was V/100, the signal amplitude of operational amplifier 2121 outputs is exactly V/20 so; When switch 3111 makes the output terminal Out3 of resistance-capacitance network 310 be connected with the negative input end In-of operational amplifier 2121; Resistance 3103, resistance 3105 and 3107 pairs of signals of resistance have carried out dividing potential drop again one time at this moment; So resistance 3105 input voltages become V/100, resistance 3107 or electric capacity 3108, operational amplifier 2121 and feedback resistance 2124 composition circuit are when the input low frequency signal; Attenuation ratio approximates feedback resistance 2124/ resistance 3107 ≈ 1/2; When input high-frequency signal, attenuation ratio approximates electric capacity/electric capacity 3108 ≈ 1/2 of corrective network 3120, if this moment, input signal amplitude was V/100; The signal amplitude of operational amplifier 2121 outputs is exactly V/200 so, has enlarged the dynamic range of input like this.
In the present embodiment; When switch 3111 is selected input end In1, In2 or In3; The different conditioning signal of control treatment module 27 outputs is given D/A modular converter 28, after D/A modular converter 28 is converted into simulating signal, gives control end COMP; Be used to change the reversed bias voltage of varactor 31201; Thereby regulate its electric capacity, first electric capacity 31204 and second electric capacity 31205 are ac-coupled to varactor 31201 on the feedback resistance 2124, and the electric capacity of corrective network 3120 is equivalent to the series value of first electric capacity 31204, second electric capacity 31205 and varactor 31201 like this; Get the capacitance of the value of first electric capacity 31204 and second electric capacity 31205, so the capacitance of corrective network 3120 is approximately the anti-electric capacity partially of varactor 31201 much larger than varactor 31201.Control treatment module 27 makes the LF-response of circuit corresponding with high frequency consistent through the electric capacity of regulating corrective network 3120, makes that the frequency response flatness of circuit is good.
In the present embodiment; Control treatment module 27 output offset signal OFFSET give D/A modular converter 28; D/A modular converter 28 is given operational amplifier 2121 through resistance 2125 after this conversion of signals is become simulating signal, is used to regulate the output end voltage of operational amplifier 2121, when input signal has bigger biasing; Can regulate OFFSET, make the output of operational amplifier 2121 in the operating voltage range that allows.Signal after operational amplifier 2121 decay is given signal processing module 22.
As further explanation; Resistance-capacitance network 310 in the present embodiment also can be made up of the resistance-capacitance circuit more than 2 or 3; Need select switch 3111 simultaneously for use with respective input; Just can realize having the input attenuation circuit of more attenuation ratios, enlarge the dynamic range of input signal more.
As further explanation; Resistance 205 in the present embodiment, electric capacity 206, resistance 3101, electric capacity 3102, resistance 3103, electric capacity 3104, resistance 3105, electric capacity 3106, resistance 3107 and electric capacity 3108 can be by a plurality of resistance and a plurality of capacitances in series or parallel connection realizations; As long as resistance is satisfied the demand; And electric capacity can be selected tunable capacitor for use, can finely tune more convenient circuit debugging like this to the value of resistance and electric capacity.
As further explanation, the compensating resistance of can connecting again of the corrective network 3120 in the present embodiment perhaps also can adopt like the mode among first embodiment, realizes that through compensating resistance and building-out capacitor series connection the frequency of regulating circuit is corresponding.
As further explanation, in two embodiment of the present invention, can be in resistance-capacitance network parallelly connected damping resistance, be used for the response of regulating circuit to step signal.
As further explanation, in two embodiment of the present invention, analog switch can be selected like the ADG904 of ADI company, ADG919 etc.
As further explanation, in two embodiment of the present invention, operational amplifier need be selected the field effect type high bandwidth amplifier for use, like the OPA6xx series of TI company.
Digital oscilloscope of the present invention; Through the circuit of the input attenuation with a plurality of attenuation ratios is provided; Realize the input high resistant simultaneously and enlarged the dynamic range of input signal greatly; And through the network that affords redress, realize the frequency response of regulating circuit, make the LF-response of circuit corresponding with high frequency consistent.
Above embodiment only is used to explain the present invention, but not is used to limit the present invention, and this area general technology people does any not creative creation according to above-mentioned design philosophy, all should be regarded as within the protection domain of this patent.
Claims (9)
1. the oscillograph with attenuator circuit comprises a signal input module of series connection successively, an input attenuation module, and a control treatment module,
It is characterized in that,
Described input attenuation module comprises a resistance-capacitance network, a switch element and amplifier unit of series connection successively; Described resistance-capacitance network comprises a plurality of resistance-capacitance circuits; Described amplifier unit comprises an operational amplifier; Described operational amplifier has a positive input terminal that is used for ground connection and one be used to the to be connected in series negative input end of output terminal of said switch element; Between the output terminal of described operational amplifier and described negative input end, be connected with a corrective network that receives described control treatment module control, described corrective network is used to regulate the frequency characteristic of described operational amplifier.
2. oscillograph according to claim 1; It is characterized in that; Described corrective network comprises a varactor, first electric capacity, second electric capacity, first current-limiting resistance and one second current-limiting resistance; Described first capacitances in series is between the input end of the negative pole of described varactor and described corrective network; Described second capacitances in series is between the output terminal of the anodal and described corrective network of described varactor; Described first current-limiting resistance is connected between the negative pole and described control treatment module of described varactor, between the positive pole and ground of the described varactor of described second current-limiting resistance series connection.
3. oscillograph according to claim 2 is characterized in that, compensating resistance of series connection between the input end of described corrective network and output terminal.
4. according to claim 1,2 or 3 described oscillographs, it is characterized in that described control treatment module is controlled described corrective network through a D/A modular converter.
5. according to claim 1,2 or 3 described oscillographs, it is characterized in that in described a plurality of resistance-capacitance circuits, having at least a resistance-capacitance circuit to comprise the circuit that composes in parallel of resistance and an electric capacity.
6. oscillograph according to claim 5; It is characterized in that; In described a plurality of resistance-capacitance circuit; Have at least a resistance-capacitance circuit to comprise two output terminals, and comprise first circuit, second circuit and tertiary circuit, described first circuit and described second circuit are connected between the input end and an output terminal of described resistance-capacitance circuit; Described first circuit and described tertiary circuit are connected between the input end and another output terminal of described resistance-capacitance circuit, and described first circuit, second circuit and tertiary circuit all are by a resistance and the circuit that electric capacity composes in parallel.
7. oscillograph according to claim 4 is characterized in that, in described a plurality of resistance-capacitance circuits, has at least a resistance-capacitance circuit to comprise the circuit that composes in parallel of resistance and an electric capacity.
8. oscillograph according to claim 7; It is characterized in that; In described a plurality of resistance-capacitance circuit; Have at least a resistance-capacitance circuit to comprise two output terminals, and comprise first circuit, second circuit and tertiary circuit, described first circuit and described second circuit are connected between the input end and an output terminal of described resistance-capacitance circuit; Described first circuit and described tertiary circuit are connected between the input end and another output terminal of described resistance-capacitance circuit, and described first circuit, second circuit and tertiary circuit all are by a resistance and the circuit that electric capacity composes in parallel.
9. the oscillograph of stating according to Claim 8 is characterized in that, between the negative input end of described operational amplifier and output terminal, connects a feedback resistance.
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