CN203608167U - Micro-signal differential amplification circuit - Google Patents
Micro-signal differential amplification circuit Download PDFInfo
- Publication number
- CN203608167U CN203608167U CN201320774560.3U CN201320774560U CN203608167U CN 203608167 U CN203608167 U CN 203608167U CN 201320774560 U CN201320774560 U CN 201320774560U CN 203608167 U CN203608167 U CN 203608167U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- amplifier
- resistance
- contacts
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000003321 amplification Effects 0.000 title abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 66
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a micro-signal differential amplification circuit which comprises a differential amplification circuit body and a 1Hz filter circuit. The differential amplification circuit body comprises a measured differential signal IN1, a measured differential signal IN2, a filter capacitor C3, a filter capacitor C4, a filter capacitor C5, a capacitor C6, a capacitor C7, an amplifier AD620, a resistor R6, a resistor R7 and a resistor R21. The 1Hz filter circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R21, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, an operational amplifier IC1 and an operational amplifier IC2. Signal measurement and computing are based on micro-signal amplification, direct-current micro-signals smaller than 50 mV cannot be directly used for an AD sampling chip and other chips, and non-direct-current signals must be filtered out and then the signals can be used after being amplified through the amplification circuit, the filter circuit and the like. The non-direct-current signals pass through the differential amplification circuit body formed by the operational amplifiers, then pass through the four-pole 1Hz filter circuit, and are converted into clean direct-current signals of about 5 V.
Description
Technical field
The utility model relates to a kind of differential amplifier circuit, relates in particular to a kind of micro-signal differential amplifier circuit.
Background technology
Microsignal amplification is the basis of signal measurement and metering, with interior small direct current signal, cannot be directly used in the chips such as AD sampling for 50mV, must be by circuit such as amplification, filtering, after amplifying by non-direct current signal filtering and by signal, re-use.Micro-signal is measured main points and the difficult point in signal measurement often.50mV is the measured signal of the meterings such as point flowmeter, checkout equipment with interior small direct current signal, and because measured signal is very weak, and the interference signal of signal periphery is stronger, and measured signal is often submerged among interference signal, cannot the measured or wrong measurement of quilt.Micro-signal differential amplifier circuit is exactly the circuit designing in such cases, and it carries out measured signal after differential amplification, through the low-frequency filter of 1Hz, is amplified to 5V left and right, thereby can carries out further DATA REASONING harmless measured signal.
Summary of the invention
The purpose of this utility model is to provide a kind of micro-signal differential amplifier circuit, and it has good wave filtering effect and clutter is converted to the feature of clean direct current signal.
The utility model is achieved like this, it comprises differential amplifier circuit and 1Hz filter circuit, and wherein differential amplifier circuit comprises tested differential signal IN1, tested differential signal IN2, filter capacitor C3, C4 and C5, capacitor C 6 and C7, amplifier AD620, resistance R 6, R7 and R21, 1Hz filter circuit comprises resistance R 8, R9, R10, R11, R12, R13, R14, R15 and R21, capacitor C 11, C12, C13, C14, C15, C16, C17, C18 and C19, operational amplifier IC1 and IC2, it is characterized in that filter capacitor C3 and C4 are in parallel with filter capacitor C5 again after connecting, the two ends of filter capacitor C5 connect respectively tested differential signal IN1 and tested differential signal IN2, tested differential signal IN1 and tested differential signal IN2 are connected to No. 3 and No. 2 contacts of amplifier AD620, one end of resistance R 6 is connected respectively tested differential signal IN2 and tested differential signal IN with one end of R21, ground connection after the other end of resistance R 6 is connected with the other end of R21, between No. 1 of amplifier AD620 and No. 8 contacts, be connected with resistance R 7, No. 4 contacts of amplifier AD620 connect respectively the negative pole of power supply and a side of capacitor C 6, the opposite side ground connection of capacitor C 6, No. 7 contacts of amplifier AD620 connect respectively the positive pole of power supply and a side of capacitor C 7, the opposite side ground connection of capacitor C 7, No. 5 contact ground connection of amplifier AD620,
No. 6 output contacts of amplifier AD620 connect the R8 in 1Hz filter circuit;
Two ends after capacitor C 12 and C16 parallel connection are connected between No. 1 contact and resistance R 8 and R9 of operational amplifier IC1, No. 3 contacts of resistance R 9 concatenation operation amplifier IC1, one end after capacitor C 11 and C13 parallel connection is connected to No. 3 contacts of operational amplifier IC1, other end ground connection, No. 1 contact of one end concatenation operation amplifier IC1 after resistance R 14 and capacitor C 14 parallel connections, the other end is No. 2 contacts and the resistance R 10 of concatenation operation amplifier IC1 respectively, resistance R 10 ground connection, No. 4 contact ground connection of operational amplifier IC1, No. 8 contacts of operational amplifier IC1 connect respectively a side of positive source and an electric capacity, the opposite side ground connection of electric capacity,
No. 1 contact contact resistance R11 of operational amplifier IC1, one end after capacitor C 18 and C19 parallel connection is connected between resistance R 11 and R12, No. 7 contacts of other end concatenation operation amplifier IC2, No. 5 contacts of the equal concatenation operation amplifier of the one side IC2 of resistance R 12 and capacitor C 17, the opposite side ground connection of capacitor C 17, No. 7 contacts of one end concatenation operation amplifier IC2 after resistance R 15 and capacitor C 15 parallel connections, the other end is No. 6 contacts and the resistance R 13 of concatenation operation amplifier IC2 respectively, resistance R 13 ground connection.
Technique effect of the present utility model is: the utility model passes through again after the differential amplifier circuit of amplifier composition, then by 4 limit 1Hz filter circuits, converts thereof into the clean direct current signal of 5V left and right.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Fig. 2 is the circuit diagram of the utility model differential amplifier circuit
Fig. 3 is the circuit diagram of the utility model 1Hz filter circuit.
Embodiment
As shown in Figure 1, the utility model is achieved like this, it comprises differential amplifier circuit and 1Hz filter circuit, wherein differential amplifier circuit comprises tested differential signal IN1, tested differential signal IN2, filter capacitor C3, C4 and C5, capacitor C 6 and C7, amplifier AD620, resistance R 6, R7 and R21, 1Hz filter circuit comprises resistance R 8, R9, R10, R11, R12, R13, R14, R15 and R21, capacitor C 11, C12, C13, C14, C15, C16, C17, C18 and C19, operational amplifier IC1 and IC2, it is characterized in that filter capacitor C3 and C4 are in parallel with filter capacitor C5 again after connecting, the two ends of filter capacitor C5 connect respectively tested differential signal IN1 and tested differential signal IN2, tested differential signal IN1 and tested differential signal IN2 are connected to No. 3 and No. 2 contacts of amplifier AD620, one end of resistance R 6 is connected respectively tested differential signal IN2 and tested differential signal IN with one end of R21, ground connection after the other end of resistance R 6 is connected with the other end of R21, between No. 1 of amplifier AD620 and No. 8 contacts, be connected with resistance R 7, No. 4 contacts of amplifier AD620 connect respectively the negative pole of power supply and a side of capacitor C 6, the opposite side ground connection of capacitor C 6, No. 7 contacts of amplifier AD620 connect respectively the positive pole of power supply and a side of capacitor C 7, the opposite side ground connection of capacitor C 7, No. 5 contact ground connection of amplifier AD620, No. 6 output contacts of amplifier AD620 connect the R8 in 1Hz filter circuit, two ends after capacitor C 12 and C16 parallel connection are connected between No. 1 contact and resistance R 8 and R9 of operational amplifier IC1, No. 3 contacts of resistance R 9 concatenation operation amplifier IC1, one end after capacitor C 11 and C13 parallel connection is connected to No. 3 contacts of operational amplifier IC1, other end ground connection, No. 1 contact of one end concatenation operation amplifier IC1 after resistance R 14 and capacitor C 14 parallel connections, the other end is No. 2 contacts and the resistance R 10 of concatenation operation amplifier IC1 respectively, resistance R 10 ground connection, No. 4 contact ground connection of operational amplifier IC1, No. 8 contacts of operational amplifier IC1 connect respectively a side of positive source and an electric capacity, the opposite side ground connection of electric capacity, No. 1 contact contact resistance R11 of operational amplifier IC1, one end after capacitor C 18 and C19 parallel connection is connected between resistance R 11 and R12, No. 7 contacts of other end concatenation operation amplifier IC2, No. 5 contacts of the equal concatenation operation amplifier of the one side IC2 of resistance R 12 and capacitor C 17, the opposite side ground connection of capacitor C 17, No. 7 contacts of one end concatenation operation amplifier IC2 after resistance R 15 and capacitor C 15 parallel connections, the other end is No. 6 contacts and the resistance R 13 of concatenation operation amplifier IC2 respectively, resistance R 13 ground connection.
Micro-signal is measured main points and the difficult point in signal measurement often.50mV is the measured signal of the meterings such as point flowmeter, checkout equipment with interior small direct current signal, and because measured signal is very weak, and the interference signal of signal periphery is stronger, and measured signal is often submerged among interference signal, cannot the measured or wrong measurement of quilt.Micro-signal differential amplifier circuit is exactly the circuit designing in such cases, and it carries out measured signal after differential amplification, through the low-frequency filter of 1Hz, is amplified to 5V left and right, thereby can carries out further DATA REASONING harmless measured signal.
If Fig. 2 is difference and the amplifying circuit of signal, tested differential signal IN1 and IN2 pass through C3, C4, after the filter capacitor of C5, access 2, No. 3 points of amplifier AD620, signal is through the differential amplification of amplifier AD620, is superimposed upon 1N1 and IN2 signal major part is cancelled out each other, if become the direct current signal of relative clean, now amplified 100 times, become the direct current signal of 5V left and right containing interference noise, exported by No. 6 points of amplifier AD620.
The direct current signal of being exported by amplifier AD6206 point is because still there is suitable high-frequency noise, direct current signal itself also may exist, still can not be used by measurement chips such as AD, be direct current signal because AD etc. measures chip needed, admittedly must carry out the very low frequency filtering of low-frequency range to it.The waveform access R8 of No. 6 point outputs of operational amplifier IC1, by as Fig. 3, by operational amplifier IC2(OP2177), four limit 1Hz filter circuits of formation, signal is by the basic filtering of alternating current component after this part, and signal is exported by No. 7 points of operational amplifier IC2;
The signal of No. 7 point outputs of operational amplifier IC2, then penetrate with processing by another operational amplifier, increase the output impedance of signal, can be input to the chips such as AD, carry out the processing on numeral and algorithm.
Claims (1)
1. a micro-signal differential amplifier circuit, it comprises differential amplifier circuit and 1Hz filter circuit, and wherein differential amplifier circuit comprises tested differential signal IN1, tested differential signal IN2, filter capacitor C3, C4 and C5, capacitor C 6 and C7, amplifier AD620, resistance R 6, R7 and R21, 1Hz filter circuit comprises resistance R 8, R9, R10, R11, R12, R13, R14, R15 and R21, capacitor C 11, C12, C13, C14, C15, C16, C17, C18 and C19, operational amplifier IC1 and IC2, it is characterized in that filter capacitor C3 and C4 are in parallel with filter capacitor C5 again after connecting, the two ends of filter capacitor C5 connect respectively tested differential signal IN1 and tested differential signal IN2, tested differential signal IN1 and tested differential signal IN2 are connected to No. 3 and No. 2 contacts of amplifier AD620, one end of resistance R 6 is connected respectively tested differential signal IN2 and tested differential signal IN with one end of R21, ground connection after the other end of resistance R 6 is connected with the other end of R21, between No. 1 of amplifier AD620 and No. 8 contacts, be connected with resistance R 7, No. 4 contacts of amplifier AD620 connect respectively the negative pole of power supply and a side of capacitor C 6, the opposite side ground connection of capacitor C 6, No. 7 contacts of amplifier AD620 connect respectively the positive pole of power supply and a side of capacitor C 7, the opposite side ground connection of capacitor C 7, No. 5 contact ground connection of amplifier AD620,
No. 6 output contacts of amplifier AD620 connect the R8 in 1Hz filter circuit;
Two ends after capacitor C 12 and C16 parallel connection are connected between No. 1 contact and resistance R 8 and R9 of operational amplifier IC1, No. 3 contacts of resistance R 9 concatenation operation amplifier IC1, one end after capacitor C 11 and C13 parallel connection is connected to No. 3 contacts of operational amplifier IC1, other end ground connection, No. 1 contact of one end concatenation operation amplifier IC1 after resistance R 14 and capacitor C 14 parallel connections, the other end is No. 2 contacts and the resistance R 10 of concatenation operation amplifier IC1 respectively, resistance R 10 ground connection, No. 4 contact ground connection of operational amplifier IC1, No. 8 contacts of operational amplifier IC1 connect respectively a side of positive source and an electric capacity, the opposite side ground connection of electric capacity,
No. 1 contact contact resistance R11 of operational amplifier IC1, one end after capacitor C 18 and C19 parallel connection is connected between resistance R 11 and R12, No. 7 contacts of other end concatenation operation amplifier IC2, No. 5 contacts of the equal concatenation operation amplifier of the one side IC2 of resistance R 12 and capacitor C 17, the opposite side ground connection of capacitor C 17, No. 7 contacts of one end concatenation operation amplifier IC2 after resistance R 15 and capacitor C 15 parallel connections, the other end is No. 6 contacts and the resistance R 13 of concatenation operation amplifier IC2 respectively, resistance R 13 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320774560.3U CN203608167U (en) | 2013-12-02 | 2013-12-02 | Micro-signal differential amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320774560.3U CN203608167U (en) | 2013-12-02 | 2013-12-02 | Micro-signal differential amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203608167U true CN203608167U (en) | 2014-05-21 |
Family
ID=50720824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320774560.3U Expired - Lifetime CN203608167U (en) | 2013-12-02 | 2013-12-02 | Micro-signal differential amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203608167U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467715A (en) * | 2014-12-02 | 2015-03-25 | 苏州沃斯麦机电科技有限公司 | Signal processing system based on second-order filter operational amplifier circuit |
-
2013
- 2013-12-02 CN CN201320774560.3U patent/CN203608167U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467715A (en) * | 2014-12-02 | 2015-03-25 | 苏州沃斯麦机电科技有限公司 | Signal processing system based on second-order filter operational amplifier circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206673918U (en) | Pyroelectricity signal amplification circuit filter | |
| CN210572490U (en) | Alternating current amplifying circuit with direct current component elimination and frequency characteristic analyzer | |
| CN203935181U (en) | A kind of ecg signal amplifier | |
| CN104000576A (en) | Electrocardiosignal amplifier | |
| CN104000583A (en) | Electrocardiosignal preamplifier circuit | |
| CN203608167U (en) | Micro-signal differential amplification circuit | |
| CN207352066U (en) | A kind of signal supervisory instrument | |
| CN204244188U (en) | Signal based on lock-in amplifier amplifies and testing circuit | |
| CN113253027A (en) | Converter measuring circuit of electromagnetic water meter | |
| CN101414807B (en) | Signal amplification circuit | |
| CN202948026U (en) | Differential capacitance voltage conversion circuit and acceleration sensor detection system | |
| CN209542835U (en) | Echo signal processing circuit | |
| CN201917355U (en) | Weak signal detection circuit | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN204517764U (en) | A kind of enlarge leadingly filter circuit for DIT | |
| CN204556030U (en) | Multiple sensor signals acquisition processing device | |
| CN104706344A (en) | Electrocardiosignal measurement collecting system | |
| CN211296688U (en) | Single-path signal echo processing circuit | |
| CN103684298B (en) | A kind of High-gain differential signal amplification circuit | |
| CN204166146U (en) | For the small signal process circuit of micro resistor | |
| CN203122375U (en) | Non-invasive blood pressure anti-interference circuit | |
| CN203933538U (en) | A kind of intelligent small voltage is measured amplifying circuit | |
| CN205539472U (en) | A laser echo signal detection device for automobile anti -collision system | |
| CN108562776B (en) | Power frequency rogowski coil with multi-range output | |
| CN201847675U (en) | Pulse signal processing circuit based on PVDF (polyvinylidene fluoride) sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 330096, B building, building 591, hi tech Avenue, Nanchang hi tech Zone, Jiangxi Patentee after: JIANGXI TELLHOW MILITARY PROJECT GROUP CO.,LTD. Address before: 330096, B building, building 591, hi tech Avenue, Nanchang hi tech Zone, Jiangxi Patentee before: JIANGXI QINGHUA TAIHAO MICRO MOTOR Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140521 |