CN203617973U - Low-power consumption wideband amplification circuit for handheld digital scopemeter - Google Patents
Low-power consumption wideband amplification circuit for handheld digital scopemeter Download PDFInfo
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- CN203617973U CN203617973U CN201320881506.9U CN201320881506U CN203617973U CN 203617973 U CN203617973 U CN 203617973U CN 201320881506 U CN201320881506 U CN 201320881506U CN 203617973 U CN203617973 U CN 203617973U
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Abstract
A low-power consumption wideband amplification circuit for a handheld digital scopemeter relates to the technical field of electronic measuring. The utility model solves the problems of large volume and high power consumption of the existing wideband amplification circuit for the digital scopemeter. A signal input end of an impedance conversion circuit is connected with a signal output end of a passive attenuation circuit of the handheld digital scopemeter; a gain adjusting signal input end of a gain amplification and offset set circuit is connected with a gain adjusting signal output end of a digital analog conversion control circuit; an offset signal input end of the gain amplification and offset set circuit is connected with an offset set signal output end of the digital analog conversion control circuit. An amplified signal output end of the gain amplification and offset set circuit is connected with a voltage signal input end of a commode mode voltage adjusting circuit of which a voltage set signal input end is connected with a common mode voltage set signal output end of the digital analog conversion control circuit. The low-power consumption wideband amplification circuit for the handheld digital scopemeter is used in the technical field of electronic measuring.
Description
Technical field
The utility model relates to and belongs to electronic measuring technology field, is specifically related to a kind of low-power consumption wideband amplification circuit.
Background technology
Oscilloscope is application a kind of exploitation, commissioning device very widely in electronic engineering field.At present along with the development of technology, oscilloscope is to the future development of miniaturization, low-power consumption.Handheld digital oscilloscope, because it is low in energy consumption, volume is little, be easy to carry, has been subject to the favor of electronic information field engineers.
In each part of Oscillograph, signal conditioning circuit, as the input channel of measured signal, is determining the important performance indexes such as pass band, certainty of measurement of complete machine, and the volume on complete machine and power consumption also have larger impact.In Oscillograph, signal conditioning circuit is generally made up of functional modules such as input impedance selection, coupling selection, passive attenuation, impedance transformation, variable gain amplification, output driving and control units.Wherein impedance transformation, variable gain are amplified, are exported the links such as driving, change larger in different Oscillographs.Tradition Oscillograph signal conditioning circuit, mostly employing ± 5V or ± 12V supply power mode, power consumption is higher, volume is larger.
The impedance inverter circuit of traditional scheme; in order to realize the functions such as high input impedance, low output impedance, high bandwidth, overload protection; conventionally the form that is built into emitter follower by elements such as field effect transistor, triode and low noise narrow-band amplifiers, circuit medium-high frequency signal is walked respectively different signal paths from low frequency signal.In order to guarantee that circuit has suitable quiescent point and larger dynamic range of signals, general employing ± 5V(or ± 12V) power voltage supply.The components and parts that tradition impedance inverter circuit is used are more, and circuit volume is large, and power consumption is high, and the performance of circuit is more responsive to component parameters, need carefully debugging when enforcement;
In variable-gain amplification circuit part, because Wideband Variable Gain Amplifier (VGA) chip is generally single power supply, and input mode is the input of both-end difference, therefore traditional scheme is before variable gain is amplified, need to adopt buffer that signal is converted into difference form by single-ended format, adjust common-mode voltage, to meet the unipolarity requirement of VGA to input signal simultaneously.The buffer here has further increased number of elements, has increased volume, has increased power consumption.
In sum, the volume that the wideband amplification circuit of existing Digital Oscillograph still exists is large, the problem that power consumption is high.
Utility model content
The utility model for the volume that solves the wideband amplification circuit of existing Digital Oscillograph and still exist large, the problem that power consumption is high, has proposed a kind of low-power consumption wideband amplification circuit for handheld digital oscilloscope.
Low-power consumption wideband amplification circuit for handheld digital oscilloscope described in the utility model, this circuit comprises: impedance inverter circuit, gain are amplified and biasing arranges circuit, common-mode voltage Circuit tuning and digital-to-analogue conversion control circuit;
The signal input part of impedance inverter circuit connects the signal output part of the passive attenuation circuit of handheld digital oscilloscope, the signal output part connection gain amplification of impedance inverter circuit and biasing arrange the broadband signal input of circuit, gain amplification and biasing arrange the gain-adjusted signal input part linking number analog converter control circuit gain-adjusted signal output part of circuit, gain amplification and biasing arrange the biasing signalization input linking number analog converter control circuit biasing signalization output of circuit, gain amplification and biasing arrange the voltage signal input of the amplified signal output connection common-mode voltage Circuit tuning of circuit, the common-mode voltage signalization output of the voltage signalization input linking number analog converter control circuit of common-mode voltage Circuit tuning, the signal output part of common-mode voltage Circuit tuning connects the signal input part of the A-D converter of handheld digital oscilloscope.
The utility model, under the prerequisite that meets bandwidth requirement, improves input impedance, reduces output impedance, and completes the enlarging function of small-signal.Wherein, gain is amplified and biasing arranges circuit, and the broadband signal of input is realized to the continuously adjustable enlarging function of gain, the simultaneously bias voltage of signalization; Common-mode voltage Circuit tuning, the common-mode voltage of adjustment amplified signal, the ADC connecting with adaptive rear end; Digital-to-analogue conversion control circuit arranges above-mentioned gain-controlled voltage, biasing control voltage and common-mode voltage control signal.The utility model has been simplified broadband impedance translation circuit, adopt special circuit connecting, remove the buffer before variable gain amplifying element, by be reduced to ± 2.5V of the supply power voltage of whole amplifying circuit, reduced circuit volume, reduced power consumption, and reduced 20% with the wideband amplification circuit phase specific volume of existing Digital Oscillograph, power-dissipation-reduced 25%.
Accompanying drawing explanation
Fig. 1 is the electrical structure block diagram of the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in the utility model;
Fig. 2 is the circuit diagram of impedance inverter circuit;
Fig. 3 is the circuit diagram that gain amplification and biasing arrange circuit;
Fig. 4 is the circuit diagram of common-mode voltage Circuit tuning;
Fig. 5 is the circuit diagram of direct current signal modulate circuit in digital-to-analogue conversion control circuit.
Embodiment
Embodiment one, in conjunction with Fig. 1, present embodiment is described, the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in present embodiment, this circuit comprises: impedance inverter circuit 1, gain are amplified and biasing arranges circuit 2, common-mode voltage Circuit tuning 3 and digital-to-analogue conversion control circuit 4;
The signal input part of impedance inverter circuit 1 connects the signal output part of the passive attenuation circuit of handheld digital oscilloscope, the signal output part connection gain amplification of impedance inverter circuit 1 and biasing arrange the broadband signal input of circuit 2, gain amplification and biasing arrange the gain-adjusted signal output part of the gain-adjusted signal input part linking number analog converter control circuit 4 of circuit 2, the biasing signalization input linking number analog converter control circuit 4 that gain is amplified and biasing the arranges circuit 2 signalization output of setovering, gain amplification and biasing arrange the voltage signal input of the amplified signal output connection common-mode voltage Circuit tuning 3 of circuit 2, the common-mode voltage signalization output of the voltage signalization input linking number analog converter control circuit 4 of common-mode voltage Circuit tuning 3, the signal output part of common-mode voltage Circuit tuning 3 connects the signal input part of the A-D converter of handheld digital oscilloscope.
Embodiment two, referring to Fig. 2, present embodiment is described, present embodiment is to the further illustrating of the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in embodiment one, impedance inverter circuit 1 also comprise inductance L 1, No. two inductance L 2, resistance R 1, No. two resistance R 2, No. three resistance R 3, capacitor C 1, No. two capacitor C 2, No. three capacitor C 3, No. four capacitor C 4, No. five capacitor C 5, operational amplifier U1 and ± 2.5V power supply;
The in-phase input end of operational amplifier U1 connects one end of No. two resistance R 2 and one end of a capacitor C 1 simultaneously, and the other end of No. two resistance R 2 connects the other end of a capacitor C 1 and one end of a resistance R 1, the other end ground connection of a resistance R 1 simultaneously; The other end of a capacitor C 1 is the signal input part of impedance inverter circuit 1;
The negative supply input of operational amplifier U1 connects one end of one end of No. four capacitor C 4, No. five capacitor C 5 and one end of No. two inductance L 2 simultaneously, the other end of No. four capacitor C 4 connects the other end and the ground of No. five capacitor C 5, the other end connection-2.5V power supply of No. two inductance L 2 simultaneously;
The positive supply input of operational amplifier U1 connects one end of one end of No. two capacitor C 2, No. three capacitor C 3 and one end of an inductance L 1 simultaneously, the other end of No. two capacitor C 2 connects the other end and the ground of No. three capacitor C 3, the other end connection+2.5V power supply of an inductance L 1 simultaneously;
The output while concatenation operation amplifier U1 inverting input of operational amplifier U1 and one end of No. three resistance R 3, the other end ground connection of No. three resistance R 3, the output of operational amplifier U1 is the signal output part of impedance inverter circuit 1.
Embodiment three, present embodiment are to the further illustrating of the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in embodiment two, and operational amplifier U1 adopts the integrated operational amplifier that model is OPA356 to realize.
The low noise wideband integrated amplifier OPA356 of present embodiment take technotron JFET as input stage realizes, physical circuit as shown in Figure 3, described signal is can the be low to moderate ± 2.5V of supply power voltage of the amplifier of OPA356, input impedance can reach G ohm magnitude, input bias current is pA level, can realize higher fixing input impedance, its output impedance is very little, and has higher pass band.The electrostatic protection diode of the 3rd pin inside of OPA356, by realizing overload protection function in the mode of input pin No. two resistance R 2 of series connection (R2=100K).In the time of exceed ± 2.5V of input signal, the voltage-drop exceeding, in No. two resistance R 2, has played the effect of protection amplifier.Be the Oscillograph standard input impedance requirement of 1M ohm by resistance R 1=1M ohm being set No. one, realizing input impedance.No. one capacitor C 1 is used for high frequency characteristics to compensate, and suppresses the 3rd pin low-pass characteristic of parasitic capacitance over the ground, to guarantee that impedance inverter circuit has higher pass band.
Adopt OPA356 to substitute traditional emitter follower and both reduced circuit volume, also reduced power consumption, more than the pass band of this circuit can reach 100MHz, meet the demand of conventional handheld digital oscilloscope simultaneously.
Embodiment four, in conjunction with Fig. 3, present embodiment is described, present embodiment is to the further illustrating of the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in embodiment one or embodiment two, gain is amplified and biasing arrange circuit 2 also comprise variable gain amplifier U2, No. six capacitor C 6, No. seven capacitor C 7, No. eight capacitor C 8, No. nine capacitor C 9, No. ten capacitor C 10,11, ten No. two capacitor C of ride on Bus No. 11 capacitor C 12, No. three inductance L 3, No. four inductance L 4 and ± 2.5V power supply;
Described variable gain amplifier U2 adopts the variable gain amplifier chip that model is AD8330 to realize;
One end of No. three inductance L 3 connects No. 2 pins of variable gain amplifier U2, No. 3 pins of variable gain amplifier U2, No. 14 pins of variable gain amplifier U2, No. 16 pins of variable gain amplifier U2, one end of No. nine capacitor C 9, one end of No. ten capacitor C 10, one end of No. seven capacitor C 7 and one end of No. six capacitor C 6 simultaneously; Other end connection+2.5V the power supply of No. three inductance L 3; The equal ground connection of the other end of the other end of No. nine capacitor C 9 and No. ten capacitor C 10; Other end connection+2.5V the power supply of No. three inductance L 3;
One end of No. four inductance L 4 connects No. 1 pin of variable gain amplifier U2, No. 6 pins of variable gain amplifier U2, No. 8 pins of variable gain amplifier U2, No. 9 pins of variable gain amplifier U2, No. 11 pins of variable gain amplifier U2, one end of a capacitor C 11 and one end of ten No. two capacitor C 12, the equal ground connection of the other end of the other end of ride on Bus No. 11 capacitor C 11 and ten No. two capacitor C 12 simultaneously; Other end connection-2.5V the power supply of No. four inductance L 4;
No. 7 pins of variable gain amplifier U2 connect one end of No. eight capacitor C 8, the other end ground connection of No. eight capacitor C 8, and No. 7 pins of variable gain amplifier U2 are the gain-adjusted signal input part that gain amplification and biasing arrange circuit 2;
No. 5 pins of variable gain amplifier U2 are the biasing signalization input that gain amplification and biasing arrange circuit 2;
No. 4 pins of variable gain amplifier U2 are the broadband signal input that gain amplification and biasing arrange circuit 2,
No. 12 pins and No. 13 pins of variable gain amplifier U2 are the amplified signal output that gain amplification and biasing arrange circuit 2.
Existing Wideband Variable Gain Amplifier VGA is generally single power supply, and input form is the input of both-end difference, therefore traditional scheme is before variable gain is amplified, need to adopt buffer that signal is converted into difference form by single-ended format, adjust common-mode voltage to meet the unipolar signal that is input as of AD8330 simultaneously.
The utility model is by the AD8330 of single supply+5V power supply, by adding the method for duplicate supply ± 2.5V power supply, build plane virtually, make the AD8330 that is generally single supply work allow the ambipolar AC signal of input, and the common-mode voltage of this AC signal can comprise with reference to ground voltage.Therefore in the utility model, the in-phase input end of AD8330 and the output of impedance inverter circuit are directly connected, and have removed buffering link.The inverting input of AD8330 is used for adjusting DC offset voltage, and this function is completed by digital-to-analogue conversion control unit.The concrete power supply of AD8330 and connecting circuit are as shown in Figure 3;
In the utility model, power pin VPSI, VPOS, VPSO and connect+5V of connect+2.5V of power enable pin ENBL conventional method, common port CMGN, CMOP, COMM and the gain control mode of AD8330 arranges end MODE, connect-2.5V of high frequency compensation Enable Pin OFST conventional method ground connection, end the 15th pin that arranges of the output signal common-mode voltage of AD8330 connects with reference to ground GND, make the common-mode voltage of output signal of AD8330 in about 0V, effectively to utilize the dynamic property of amplifier.The pass band of this part amplifying circuit can reach 150MHz, and within the scope of 0-40dB, gain is adjustable continuously.The gain of AD8330 is sent specific direct voltage by digital to analog converter and is controlled, and the excursion that gain changes the voltage Vdbs of required No. 7 pins of control voltage within the scope of 0-40dB is:
-2.2V≤Vdbs≤-1.0V，
The functional relation of controlling between voltage Vdbs and gain G is:
Embodiment five, in conjunction with Fig. 4, present embodiment is described, present embodiment is further illustrating the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in embodiment one or embodiment two, common-mode voltage Circuit tuning 3 also comprises capacitor C 13 ten No. three, ten No. four capacitor C 14, ten No. five capacitor C 15, ten No. six capacitor C 16, ten No. seven capacitor C 17, ten No. eight capacitor C 18, ten No. nine capacitor C 19, two No. ten capacitor C 20, two ride on Bus No. 11 capacitor C 21, 20 No. two capacitor C 22, 20 No. three capacitor C 23, No. four resistance R 4, No. five resistance R 5, No. six resistance R 6, No. seven resistance R 7, No. eight resistance R 8, No. nine resistance R 9, No. ten resistance R 10, No. five inductance L 5, No. six inductance L 6, differential operational amplifier U3 and ± 2.5V power supply,
It is THS4520 Full differential operational amplifier that described differential operational amplifier U3 adopts model;
No. 2 pins of differential operational amplifier U3 connect one end of No. seven resistance R 7 and one end of No. six resistance R 6 simultaneously, the other end of No. seven resistance R 7 connects one end of No. 3 pins of differential operational amplifier U3, No. nine resistance R 9 and one end of No. ten resistance R 10 simultaneously, and the other end of No. ten resistance R 10 connects one end of one end of No. eight resistance R 8, No. five resistance R 5 and No. 10 pins of differential operational amplifier U3 simultaneously; The other end of No. five resistance R 5 connects No. 11 pins of differential operational amplifier U3 and one end of No. four resistance R 4 simultaneously, and one end of No. four resistance R 4 connects one end of ten No. three capacitor C 13, and the other end of ten No. three capacitor C 13 connects the other end of No. six resistance R 6;
The two ends of ten No. three capacitor C 13 are the voltage signal input of common-mode voltage Circuit tuning 3;
The other end of the other end of No. eight resistance R 8 and No. nine resistance R 9 is the signal output part of common-mode voltage Circuit tuning 3;
No. 4 pins of differential operational amplifier U3 connect one end of ten No. five capacitor C 15, and No. 4 pins of differential operational amplifier U3 connect one end of ten No. five capacitor C 15, the other end ground connection of ten No. five capacitor C 15;
No. 9 pins of differential operational amplifier U3 connect one end of ten No. four capacitor C 14, the other end ground connection of ten No. four capacitor C 14;
And the voltage signal input that No. 4 pins of differential operational amplifier U3 and No. 9 pins of differential operational amplifier U3 are common-mode voltage Circuit tuning 3;
No. 7 pins of No. 5 pins of differential operational amplifier U3, No. 6 pins of differential operational amplifier U3, differential operational amplifier U3 and No. 8 the pin be simultaneously connected+2.5V power supplys of differential operational amplifier U3 and one end of No. six inductance L 6,
Two No. ten capacitor C 20,21,20 No. two capacitor C 22 of two ride on Bus No. 11 capacitor C are all in parallel with 20 No. three capacitor C 23, and one end of two No. ten capacitor C 20 connects the other end of No. six inductance L 6, the other end ground connection of 20 No. three capacitor C 23;
No. 15 pins of No. 13 pins of differential operational amplifier U3, No. 14 pins of differential operational amplifier U3, differential operational amplifier U3 and No. 16 the pin be simultaneously connected-2.5V power supplys of differential operational amplifier U3 and one end of No. five inductance L 5,
18 and ten No. nine capacitor C 19 parallel connections of 17, ten No. eight capacitor C of 16, ten No. seven capacitor C of ten No. six capacitor C, and one end of ten No. six capacitor C 16 connects the other end of No. five inductance L 5, the other end ground connection of ten No. six capacitor C 16.
The function of common-mode voltage adjustment unit has two aspects: the one, improve amplifying circuit carrying load ability as output driver, the 2nd, the common-mode voltage of difference output suitably to be adjusted, the amplitude range that guarantees signal drops in the input range that A-D converter allows.High speed analog-to-digital converter is all unipolar difference input conventionally, and the input signal common-mode voltage allowing is generally lower than 1V, and the peak-to-peak value of input signal is lower than 1V.Therefore the rail-to-rail Differential OPAMP THS4520 of the power supply of the also adopt ± 2.5V of common-mode voltage Circuit tuning in this programme realizes above-mentioned functions.The input of common-mode voltage adjustment unit is connected with two outputs of variable gain wide-band amplifier, and two outputs of common-mode voltage adjustment unit are connected with the differential input end of A-D converter.Physical circuit topological structure as shown in Figure 4.Wherein the common-mode voltage signalization Vcom of output signal, according to the allowed band of adopted A-D converter, is provided by digital-to-analogue conversion control circuit.
Embodiment six, in conjunction with Fig. 5, present embodiment is described, present embodiment is that digital-to-analogue conversion control circuit 4 also comprises digital to analog converter and direct current signal modulate circuit to the further illustrating of the low-power consumption wideband amplification circuit for handheld digital oscilloscope described in embodiment one; Digital to analog converter Si road switching signal output connects direct current signal modulate circuit Si road switching signal input;
Described direct current signal modulate circuit also comprise operational amplifier U4A, No. two operational amplifier U4B, No. three operational amplifier U4C, No. four operational amplifier U4B, 27,20 No. eight capacitor C 28 of 26,20 No. seven capacitor C of 25,20 No. six capacitor C of 24,20 No. five capacitor C of 20 No. four capacitor C, 15, ten No. six resistance R 16 of 14, ten No. five resistance R of 13, ten No. four resistance R of 12, ten No. three resistance R of 11, ten No. two resistance R of ride on Bus No. 11 resistance R and ± 2.5V power supply;
The in-phase input end of an operational amplifier U4A is the first via switching signal input of direct current signal modulate circuit;
The positive supply input of an operational amplifier U4A
Connect simultaneously 20 No. four capacitor C 24 one end and+2.5V power supply, the other end ground connection of 20 No. four capacitor C 24;
The negative supply input of an operational amplifier U4A connect simultaneously 20 No. five capacitor C 25 one end and-2.5V power supply, the other end ground connection of 20 No. five capacitor C 25;
The output of an operational amplifier U4A connects the inverting input of an operational amplifier U4A and one end of ride on Bus No. 11 resistance R 11 simultaneously, the other end of ride on Bus No. 11 resistance R 11 connects one end of ten No. two resistance R 12 and the inverting input of No. two operational amplifier U4B simultaneously, ten No. two resistance R 12 other ends connect one end of No. two operational amplifier U4B outputs and 20 No. six capacitor C 26 simultaneously, the other end ground connection of 20 No. six capacitor C 26; No. two operational amplifier U4B outputs are the gain-adjusted signal output part of digital-to-analogue conversion control circuit 4;
The in-phase input end of No. three operational amplifier U4C connects one end of ten No. three resistance R 13 and one end of ten No. four resistance R 14 simultaneously, the other end ground connection of ten No. three resistance R 13, the other end of ten No. four resistance R 14 is the second tunnel switching signal input of direct current signal modulate circuit;
The inverting input of No. three operational amplifier U4C connects one end of ten No. five resistance R 15 and one end of ten No. six resistance R 16 simultaneously, and the other end of ten No. five resistance R 15 is the Third Road switching signal input of direct current signal modulate circuit;
The other end of ten No. six resistance R 16 connects the output of No. three operational amplifier U4C and one end of 20 No. seven capacitor C 27, the other end ground connection of 20 No. seven capacitor C 27 simultaneously; The output of No. three operational amplifier U4C is the digital-to-analogue conversion control circuit 4 signalization output of setovering;
The in-phase input end of No. four operational amplifier U4B is direct current signal modulate circuit tetra-tunnel switching signal inputs;
The inverting input of No. four operational amplifier U4B connects the output of No. four operational amplifier U4B and one end of 20 No. eight capacitor C 28, the other end ground connection of 20 No. eight capacitor C 28 simultaneously; The output of No. four operational amplifier U4B is the common-mode voltage signalization output of digital-to-analogue conversion control circuit 4.
Digital-to-analogue conversion control circuit is made up of digital to analog converter DAC and direct current signal modulate circuit.The related gain-controlled voltage Vdbs of aforementioned circuit, biasing arranges voltage Voffset and common-mode voltage signalization Vcom produces by digital to analog converter, then convert required corresponding voltage value to by low-power consumption direct current signal modulate circuit, wherein the output area of digital to analog converter is 0-2.5V, needs altogether 4 road DAC outputs: DAC0, DAC1, DAC2, DAC3.The rail-to-rail low noise amplifier AD8608 of select ± 2.5V of direct current signal modulate circuit power supply realizes.
Fig. 5 has provided the concrete type of attachment of direct current signal modulate circuit, gain-controlled voltage takies a way weighted-voltage D/A converter output first via switching signal DAC0, realize via following with see-saw circuit, the output area of this circuit is [2.5,0] V, meet the output requirement of Vdbs ∈ [2.2 ,-1.0] V.Biasing arranges voltage Voffset and takies 2 way weighted-voltage D/A converters and export the second tunnel switching signal DAC1, Third Road switching signal DAC2, and by difference ratio computing circuit, to obtain scope be [2.5 ,+2.5] V that voltage is set.Common-mode voltage signalization Vcom takies a way weighted-voltage D/A converter output Si road switching signal DAC3, adopts voltage follower form, and the scope that arranges is for [0,2.5] V.
Claims (6)
1. for the low-power consumption wideband amplification circuit of handheld digital oscilloscope, it is characterized in that, this circuit comprises: impedance inverter circuit (1), gain are amplified and biasing arranges circuit (2), common-mode voltage Circuit tuning (3) and digital-to-analogue conversion control circuit (4);
The signal input part of impedance inverter circuit (1) connects the signal output part of the passive attenuation circuit of handheld digital oscilloscope, the signal output part connection gain amplification of impedance inverter circuit (1) and biasing arrange the broadband signal input of circuit (2), gain amplification and biasing arrange the gain-adjusted signal output part of the gain-adjusted signal input part linking number analog converter control circuit (4) of circuit (2), gain amplification and biasing arrange biasing signalization input linking number analog converter control circuit (4) the biasing signalization output of circuit (2), gain amplification and biasing arrange the voltage signal input of the amplified signal output connection common-mode voltage Circuit tuning (3) of circuit (2), the common-mode voltage signalization output of the voltage signalization input linking number analog converter control circuit (4) of common-mode voltage Circuit tuning (3), the signal output part of common-mode voltage Circuit tuning (3) connects the signal input part of the A-D converter of handheld digital oscilloscope.
2. the low-power consumption wideband amplification circuit for handheld digital oscilloscope according to claim 1, it is characterized in that, impedance inverter circuit (1) also comprise an inductance (L1), No. two inductance (L2), a resistance (R1), No. two resistance (R2), No. three resistance (R3), an electric capacity (C1), No. two electric capacity (C2), No. three electric capacity (C3), No. four electric capacity (C4), No. five electric capacity (C5), operational amplifier (U1) and ± 2.5V power supply;
The in-phase input end of operational amplifier (U1) connects one end of No. two resistance (R2) and one end of an electric capacity (C1) simultaneously, the other end of No. two resistance (R2) connects one end of the other end and a resistance (R1) of an electric capacity (C1), the other end ground connection of a resistance (R1) simultaneously; The other end of an electric capacity (C1) is the signal input part of impedance inverter circuit (1);
The negative supply input of operational amplifier (U1) connects one end, one end of No. five electric capacity (C5) and one end of No. two inductance (L2) of No. four electric capacity (C4) simultaneously, the other end of No. four electric capacity (C4) connects the other end and the ground of No. five electric capacity (C5), the other end connection-2.5V power supply of No. two inductance (L2) simultaneously;
The positive supply input of operational amplifier (U1) connects one end, one end of No. three electric capacity (C3) and one end of an inductance (L1) of No. two electric capacity (C2) simultaneously, the other end of No. two electric capacity (C2) connects the other end and the ground of No. three electric capacity (C3), the other end connection+2.5V power supply of an inductance (L1) simultaneously;
Output while concatenation operation amplifier (U1) inverting input of operational amplifier (U1) and one end of No. three resistance (R3), the other end ground connection of No. three resistance (R3), the output of operational amplifier (U1) is the signal output part of impedance inverter circuit (1).
3. the low-power consumption wideband amplification circuit for handheld digital oscilloscope according to claim 2, is characterized in that, operational amplifier (U1) adopts the integrated operational amplifier that model is OPA356 to realize.
4. the low-power consumption wideband amplification circuit for handheld digital oscilloscope according to claim 1 and 2, it is characterized in that, gain is amplified and biasing arrange circuit (2) also comprise variable gain amplifier (U2), No. six electric capacity (C6), No. seven electric capacity (C7), No. eight electric capacity (C8), No. nine electric capacity (C9), No. ten electric capacity (C10), ride on Bus No. 11 electric capacity (C11), ten No. two electric capacity (C12), No. three inductance (L3), No. four inductance (L4) and ± 2.5V power supply;
Described variable gain amplifier (U2) adopts the variable gain amplifier chip that model is AD8330 to realize;
One end of No. three inductance (L3) connects No. 2 pins of variable gain amplifier (U2), No. 3 pins of variable gain amplifier (U2), No. 14 pins of variable gain amplifier (U2), No. 16 pins of variable gain amplifier (U2), one end of No. nine electric capacity (C9), one end, one end of No. seven electric capacity (C7) and one end of No. six electric capacity (C6) of No. ten electric capacity (C10) simultaneously; Other end connection+2.5V the power supply of No. three inductance (L3); The equal ground connection of the other end of the other end of No. nine electric capacity (C9) and No. ten electric capacity (C10); Other end connection+2.5V the power supply of No. three inductance (L3);
One end of No. four inductance (L4) connects No. 1 pin of variable gain amplifier (U2), No. 6 pins of variable gain amplifier (U2), No. 8 pins of variable gain amplifier (U2), No. 9 pins of variable gain amplifier (U2), No. 11 pins, one end of ride on Bus No. 11 electric capacity (C11) and one end of ten No. two electric capacity (C12) of variable gain amplifier (U2), the equal ground connection of the other end of the other end of ride on Bus No. 11 electric capacity (C11) and ten No. two electric capacity (C12) simultaneously; Other end connection-2.5V the power supply of No. four inductance (L4);
No. 7 pins of variable gain amplifier (U2) connect one end of No. eight electric capacity (C8), the other end ground connection of No. eight electric capacity (C8), and No. 7 pins of variable gain amplifier (U2) are the gain-adjusted signal input part that gain amplification and biasing arrange circuit (2);
No. 5 pins of variable gain amplifier (U2) are the biasing signalization input that gain amplification and biasing arrange circuit (2);
No. 4 pins of variable gain amplifier (U2) are the broadband signal input that gain amplification and biasing arrange circuit (2),
No. 12 pins and No. 13 pins of variable gain amplifier (U2) are the amplified signal output that gain amplification and biasing arrange circuit (2).
5. the low-power consumption wideband amplification circuit for handheld digital oscilloscope according to claim 1 and 2, it is characterized in that, common-mode voltage Circuit tuning (3) also comprises ten No. three electric capacity (C13), ten No. four electric capacity (C14), ten No. five electric capacity (C15), ten No. six electric capacity (C16), ten No. seven electric capacity (C17), ten No. eight electric capacity (C18), ten No. nine electric capacity (C19), two No. ten electric capacity (C20), two ride on Bus No. 11 electric capacity (C21), 20 No. two electric capacity (C22), 20 No. three electric capacity (C23), No. four resistance (R4), No. five resistance (R5), No. six resistance (R6), No. seven resistance (R7), No. eight resistance (R8), No. nine resistance (R9), No. ten resistance (R10), No. five inductance (L5), No. six inductance (L6), differential operational amplifier (U3) and ± 2.5V power supply,
It is THS4520 Full differential operational amplifier that described differential operational amplifier (U3) adopts model;
No. 2 pins of differential operational amplifier (U3) connect one end of No. seven resistance (R7) and one end of No. six resistance (R6) simultaneously, the other end of No. seven resistance (R7) connects No. 3 pins, one end of No. nine resistance (R9) and one end of No. ten resistance (R10) of differential operational amplifier (U3) simultaneously, and the other end of No. ten resistance (R10) connects one end, one end of No. five resistance (R5) and No. 10 pins of differential operational amplifier (U3) of No. eight resistance (R8) simultaneously; The other end of No. five resistance (R5) connects one end of No. 11 pins and No. four resistance (R4) of differential operational amplifier (U3) simultaneously, one end of No. four resistance (R4) connects one end of ten No. three electric capacity (C13), and the other end of ten No. three electric capacity (C13) connects the other end of No. six resistance (R6);
The two ends of ten No. three electric capacity (C13) are the voltage signal input of common-mode voltage Circuit tuning (3);
The other end of the other end of No. eight resistance (R8) and No. nine resistance (R9) is the signal output part of common-mode voltage Circuit tuning (3);
No. 4 pins of differential operational amplifier (U3) connect one end of ten No. five electric capacity (C15), and No. 4 pins of differential operational amplifier (U3) connect one end of ten No. five electric capacity (C15), the other end ground connection of ten No. five electric capacity (C15);
No. 9 pins of differential operational amplifier (U3) connect one end of ten No. four electric capacity (C14), the other end ground connection of ten No. four electric capacity (C14);
And No. 4 pins of differential operational amplifier (U3) and No. 9 pins of differential operational amplifier (U3) are the voltage signal input of common-mode voltage Circuit tuning (3);
No. 8 pin be simultaneously connected+2.5V power supplys of No. 7 pins of No. 5 pins of differential operational amplifier (U3), No. 6 pins of differential operational amplifier (U3), differential operational amplifier (U3) and differential operational amplifier (U3) and one end of No. six inductance (L6), two No. ten electric capacity (C20), two ride on Bus No. 11 electric capacity (C21), 20 No. two electric capacity (C22) are all in parallel with 20 No. three electric capacity (C23), and one end of two No. ten electric capacity (C20) connects the other end of No. six inductance (L6), the other end ground connection of 20 No. three electric capacity (C23);
No. 16 pin be simultaneously connected-2.5V power supplys of No. 15 pins of No. 13 pins of differential operational amplifier (U3), No. 14 pins of differential operational amplifier (U3), differential operational amplifier (U3) and differential operational amplifier (U3) and one end of No. five inductance (L5), ten No. six electric capacity (C16), ten No. seven electric capacity (C17), ten No. eight electric capacity (C18) and ten No. nine electric capacity (C19) parallel connection, and one end of ten No. six electric capacity (C16) connects the other end of No. five inductance (L5), the other end ground connection of ten No. six electric capacity (C16).
6. the low-power consumption wideband amplification circuit for handheld digital oscilloscope according to claim 1, is characterized in that, digital-to-analogue conversion control circuit (4) also comprises digital to analog converter and direct current signal modulate circuit; Digital to analog converter Si road switching signal output connects direct current signal modulate circuit Si road switching signal input;
Described direct current signal modulate circuit also comprises an operational amplifier (U4A), No. two operational amplifiers (U4B), No. three operational amplifiers (U4C), No. four operational amplifiers (U4B), 20 No. four electric capacity (C24), 20 No. five electric capacity (C25), 20 No. six electric capacity (C26), 20 No. seven electric capacity (C27), 20 No. eight electric capacity (C28), ride on Bus No. 11 resistance (R11), ten No. two resistance (R12), ten No. three resistance (R13), ten No. four resistance (R14), ten No. five resistance (R15), ten No. six resistance (R16) and ± 2.5V power supply,
The in-phase input end of an operational amplifier (U4A) is the first via switching signal input of direct current signal modulate circuit;
The positive supply input of an operational amplifier (U4A) connect simultaneously 20 No. four electric capacity (C24) one end and+2.5V power supply, the other end ground connection of 20 No. four electric capacity (C24);
The negative supply input of an operational amplifier (U4A) connect simultaneously 20 No. five electric capacity (C25) one end and-2.5V power supply, the other end ground connection of 20 No. five electric capacity (C25);
The output of an operational amplifier (U4A) connects one end of inverting input and the ride on Bus No. 11 resistance (R11) of an operational amplifier (U4A) simultaneously, the other end of ride on Bus No. 11 resistance (R11) connects one end of ten No. two resistance (R12) and the inverting input of No. two operational amplifiers (U4B) simultaneously, ten No. two resistance (R12) other end connects one end of No. two operational amplifier (U4B) outputs and 20 No. six electric capacity (C26), the other end ground connection of 20 No. six electric capacity (C26) simultaneously; No. two operational amplifiers (U4B) output is the gain-adjusted signal output part of digital-to-analogue conversion control circuit (4);
The in-phase input end of No. three operational amplifiers (U4C) connects one end of ten No. three resistance (R13) and one end of ten No. four resistance (R14) simultaneously, the other end ground connection of ten No. three resistance (R13), the other end of ten No. four resistance (R14) is the second tunnel switching signal input of direct current signal modulate circuit;
The inverting input of No. three operational amplifiers (U4C) connects one end of ten No. five resistance (R15) and one end of ten No. six resistance (R16) simultaneously, and the other end of ten No. five resistance (R15) is the Third Road switching signal input of direct current signal modulate circuit;
The other end of ten No. six resistance (R16) connects one end of output and 20 No. seven electric capacity (C27) of No. three operational amplifiers (U4C), the other end ground connection of 20 No. seven electric capacity (C27) simultaneously; The output of No. three operational amplifiers (U4C) is digital-to-analogue conversion control circuit (4) biasing signalization output;
The in-phase input end of No. four operational amplifiers (U4B) is direct current signal modulate circuit tetra-tunnel switching signal inputs;
The inverting input of No. four operational amplifiers (U4B) connects one end of output and 20 No. eight electric capacity (C28) of No. four operational amplifiers (U4B), the other end ground connection of 20 No. eight electric capacity (C28) simultaneously; The output of No. four operational amplifiers (U4B) is the common-mode voltage signalization output of digital-to-analogue conversion control circuit (4).
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| 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 |
| CN105181146A (en) * | 2015-06-02 | 2015-12-23 | 中国科学院上海技术物理研究所 | Nonuniformity correction system of variable gain amplifier and nonuniformity correction method |
| CN106330245A (en) * | 2016-11-21 | 2017-01-11 | 深圳市丰禾原电子科技有限公司 | Rf wireless receiving signal amplifier chip |
| CN106680558A (en) * | 2016-12-15 | 2017-05-17 | 西北核技术研究所 | Input channel active protection circuit for large dynamic range oscilloscope |
| CN109889165A (en) * | 2019-02-01 | 2019-06-14 | 东南大学 | A kind of output common mode voltage regulated amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105181146A (en) * | 2015-06-02 | 2015-12-23 | 中国科学院上海技术物理研究所 | Nonuniformity correction system of variable gain amplifier and nonuniformity correction method |
| 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 |
| CN105116362B (en) * | 2015-08-26 | 2017-10-31 | 电子科技大学 | A kind of oscilloscope analog front end impedance inverter circuit with program control calibration function |
| CN106330245A (en) * | 2016-11-21 | 2017-01-11 | 深圳市丰禾原电子科技有限公司 | Rf wireless receiving signal amplifier chip |
| CN106330245B (en) * | 2016-11-21 | 2019-06-21 | 深圳市丰禾原电子科技有限公司 | RF wireless reception of signals amplifier chip |
| CN106680558A (en) * | 2016-12-15 | 2017-05-17 | 西北核技术研究所 | Input channel active protection circuit for large dynamic range oscilloscope |
| CN106680558B (en) * | 2016-12-15 | 2019-02-05 | 西北核技术研究所 | A kind of Larger Dynamic range oscillograph input channel active protective circuit |
| CN109889165A (en) * | 2019-02-01 | 2019-06-14 | 东南大学 | A kind of output common mode voltage regulated amplifier |
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