CN107959481A - A kind of filter circuit based on capacitive sensing technology - Google Patents
A kind of filter circuit based on capacitive sensing technology Download PDFInfo
- Publication number
- CN107959481A CN107959481A CN201610903982.4A CN201610903982A CN107959481A CN 107959481 A CN107959481 A CN 107959481A CN 201610903982 A CN201610903982 A CN 201610903982A CN 107959481 A CN107959481 A CN 107959481A
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- Prior art keywords
- filter circuit
- filter
- resistance
- pressure limiting
- amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
- H03H11/48—One-port networks simulating reactances
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Abstract
The invention discloses a kind of filter circuit based on capacitive sensing technology, it is indispensable useful instrument inside various filters.Including pressure limiting resistance, amplifier, first filter circuit and the second filter circuit, it is to be fixedly installed pressure limiting resistance inside filter circuit, amplifier, first filter circuit and the second filter circuit, filter circuit front end is fixedly installed the first filter circuit, first filter circuit rear end is fixedly installed pressure limiting resistance, pressure limiting resistance rear end is fixedly installed amplifier, amplifier rear end is fixedly installed the second filter circuit, the new filter circuit based on capacitance sense technology is cheap, it is novel in design, it is innovative high, practical convenient, it is reliable and stable, the new filter circuit based on capacitance sense technology is internally provided with pressure limiting resistance, amplifier, first filter circuit and the second filter circuit, clutter can effectively be filtered out, keep signal stabilization, meet the design requirement of filter circuit.
Description
Technical field
The present invention relates to a kind of filter circuit, more particularly to a kind of filter circuit based on capacitive sensing technology.
Background technology
In electronic technology field, the value that " ripple " is narrowly confined to refer in particular to describe various physical quantitys becomes with time jitter
The process of change, the process are converted into the function of time of voltage or electric current, are referred to as various things by the effect of various kinds of sensors
The time waveform of reason amount, or referred to as signal, because the independent variable time is continuous value, referred to as continuous time believes
Number, and habitually it is referred to as analog signal（Analog Signal）.
With the generation and rapid development of digital electronic computer technology, for the ease of computer to signal at
Reason, generates the complete theoretical and method that continuous time signal is transformed into discrete-time signal under sampling theorem guidance,
That is, original signal only can be expressed without losing with sample value of the original analog signal on series of discrete time coordinate point
Lose any information since the expression of ripple, waveform, signal these concepts be various physical quantitys in objective world change, naturally
It is the carrier for the various information that modern society depends on for existence, information needs to propagate, and what is leaned on is exactly the transmission of waveform signal.
Signal may be distorted in each link of its generation, conversion, transmission due to the presence of environment and interference,
Even in quite a number of cases, this distortion is also very serious, so that signal and its entrained information are by deep buried
Among noise, so existing signal generator has been required for filter to realize its filter effect, when this kind equipment is most
Expensive, filter effect, which also differs, to be set.
In recent years, the hair of MEMS (Micro Electro Mechanical systems, microelectromechanical systems) technology
Exhibition opens brand-new a technical field and industry, it uses the generation technique similar with integrated circuit (IC), makes cost performance
Increased substantially relative to tradition machinery manufacturing technology, lead system and product to miniaturization, intelligent, integrated hair
Exhibition, the microsensor made of MEMS technology, microactrator, Micromechanical Optics device, power electronic devices are in aviation, boat
My god, automobile, biomedicine, environmental monitoring, suffer from very wide application prospect in military nearly all field.
Therefore it provides a kind of filter circuit based on capacitive sensing technology becomes industry problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of simple in structure, design rationally, Practical science, can effectively filter out clutter
A kind of filter circuit based on capacitive sensing technology.
The technical solution of present invention solution technical problem is to achieve these goals：It is a kind of based on capacitive sensing technology
Filter circuit, including pressure limiting resistance, amplifier, the first filter circuit and the second filter circuit, the fixed setting of filter circuit inside
Limited piezoresistance, amplifier, the first filter circuit and the second filter circuit, filter circuit front end are fixedly installed the first filtering
Circuit, the first filter circuit rear end are fixedly installed pressure limiting resistance, and pressure limiting resistance rear end is fixedly installed amplifier, after amplifier
End is fixedly installed the second filter circuit.
The pressure limiting resistance is fixed at the input terminal of signal wave, effective resistance value of pressure limiting resistance is 100 ohm,
1000 ohm, 10K ohm or 100K ohm, the number of pressure limiting resistance at least 1.
The amplifier is a kind of signal amplification circuit, and amplifier is internally provided with mutual inductor, mutual inductor one
Kind step-up coil or up-flow coil, the number of amplifier at least 1.
1 the first filter resistance R1 and 1 the first filter capacitor C1 are fixedly installed inside first filter circuit,
The output terminal connection ground of first filter circuit.
The line input terminal of the first filter resistance R1 is fixedly connected with signal input part, and line output terminal is fixedly connected with first
Filter capacitor C1.
The line input terminal of the first filter capacitor C1 is fixedly connected with the line output terminal of the first filter resistance R1, line output
End is fixedly connected with ground.
1 the second filter resistance R2,1 the second filter capacitor C2 and 1 are provided with surely inside second filter circuit
A second filter capacitor C3 or 1 the second filter resistance R2,1 the second filter resistance R3 and 1 the second filter capacitor C2, the
The output terminal connection ground of two filter circuits.
The capacitance of the capacitance C1 meets following calculation formula：C=1/2RF π, wherein, C is the electricity of the capacitance C1
Capacitance, π 3.1415926, R are the resistance value of load resistance R1, and F is cutoff frequency.
The capacitance of the capacitance C2 or C3 meets following calculation formula：C=1/2RF π, wherein, C for capacitance C2 or
The capacitance of person C3, π 3.1415926, R are the resistance value of load resistance R2 or R3, and F is cutoff frequency.
The present invention has following advantages and effect compared with prior art：
The filter circuit volume based on capacitance sense technology is moderate, simple in structure, novel in design, innovative high, easy to use, surely
It is fixed reliable, it is cheap, pressure limiting resistance, amplifier, the first filter are provided with a kind of filter circuit based on capacitive sensing technology
Wave circuit and the second filter circuit so that the miscellaneous signal wave from signal source can be in the first filter circuit and the second filter circuit
Under filtration, safe and stable signal wave is obtained, meets the design requirement of the filter circuit based on capacitance sense technology.
Brief description of the drawings
Fig. 1 is the structure diagram of embodiment of the present invention one.
Fig. 2 is the structure diagram of embodiment of the present invention two.
In figure：Pressure limiting resistance 1, amplifier 2, the first filter circuit 3, the second filter circuit 4.
Embodiment
The present invention is described in further detail with reference to embodiment.Following embodiments are only the several specific of the present invention
Embodiment, but the design concept of the present invention is not limited thereto, all changes for carrying out unsubstantiality to the present invention using this design,
Should all be within the scope of the present invention.
Embodiment 1：
As shown in Figs. 1-2, a kind of filter circuit based on capacitive sensing technology, including the filtering of pressure limiting resistance 1, amplifier 2, first
3 and second filter circuit 4 of circuit, is fixedly installed pressure limiting resistance 1, amplifier 2,3 and of the first filter circuit inside filter circuit
Second filter circuit 4, filter circuit front end are fixedly installed the first filter circuit 3, the fixed setting of 3 rear end of the first filter circuit
Limited piezoresistance 1,1 rear end of pressure limiting resistance are fixedly installed amplifier 2, and 2 rear end of amplifier is fixedly installed the second filter circuit
4。
When being filtered using the present invention：The filter circuit is connected to signal source output end position, signal wave enters filtered electrical
Road, is first into the first filter circuit 3, and under the filtration of the first filter circuit 3, part clutter will be disposed of,
Entered by the signal wave of the first filter circuit 3 inside pressure limiting resistance 1, then by amplifier 2, finally reach the second filtered electrical
Road 4, carries out all-wave filtering, finally obtains the signal wave of stable safety.
Claims (9)
1. a kind of filter circuit based on capacitive sensing technology, including pressure limiting resistance（1）, amplifier（2）, the first filter circuit
（3）With the second filter circuit（4）, it is characterised in that：Pressure limiting resistance is fixedly installed inside filter circuit（1）, amplifier（2）、
First filter circuit（3）With the second filter circuit（4）, filter circuit front end is fixedly installed the first filter circuit（3）, first
Filter circuit（3）Rear end is fixedly installed pressure limiting resistance（1）, pressure limiting resistance（1）Rear end is fixedly installed amplifier（2）, amplification
Device（2）Rear end is fixedly installed the second filter circuit（4）.
A kind of 2. filter circuit based on capacitive sensing technology according to claim 1, it is characterised in that the pressure limiting
Resistance（1）It is fixed at the input terminal of signal wave, pressure limiting resistance（1）Effective resistance value be 100 ohm, 1000 ohm, 10K Europe
Nurse or 100K ohm, pressure limiting resistance（1）Number at least 1.
A kind of 3. filter circuit based on capacitive sensing technology according to claim 1, it is characterised in that the amplification
Device（2）For a kind of signal amplification circuit, amplifier（2）Be internally provided with mutual inductor, mutual inductor for a kind of step-up coil or
Person flows up coil, amplifier（2）Number at least 1.
A kind of 4. filter circuit based on capacitive sensing technology according to claim 1, it is characterised in that described first
Filter circuit（3）Inside is fixedly installed 1 the first filter resistance R1 and 1 the first filter capacitor C1, the first filter circuit（3）
Output terminal connection ground.
A kind of 5. filter circuit based on capacitive sensing technology according to claim 4, it is characterised in that described first
The line input terminal of filter resistance R1 is fixedly connected with signal input part, and line output terminal is fixedly connected with the first filter capacitor C1.
A kind of 6. filter circuit based on capacitive sensing technology according to claim 4, it is characterised in that described first
The line input terminal of filter capacitor C1 is fixedly connected with the line output terminal of the first filter resistance R1, and line output terminal is fixedly connected with ground.
A kind of 7. filter circuit based on capacitive sensing technology according to claim 1, it is characterised in that described second
Filter circuit（4）Inside is provided with 1 the second filter resistance R2,1 the second filter capacitor C2 and 1 the second filter capacitor C3 surely
Or 1 the second filter resistance R2,1 the second filter resistance R3 and 1 the second filter capacitor C2, the second filter circuit（4）'s
Output terminal connects ground.
A kind of 8. filter circuit based on capacitive sensing technology according to claim 5, it is characterised in that the capacitance
The capacitance of C1 meets following calculation formula：C=1/2RF π, wherein, C be the capacitance C1 capacitance, π 3.1415926,
R is the resistance value of load resistance R1, and F is cutoff frequency.
A kind of 9. filter circuit based on capacitive sensing technology according to claim 7, it is characterised in that the capacitance
The capacitance of C2 or C3 meets following calculation formula：C=1/2RF π, wherein, C is the capacitance of capacitance C2 or C3, and π is
3.1415926, R be the resistance value of load resistance R2 or R3, and F is cutoff frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903982.4A CN107959481A (en) | 2016-10-17 | 2016-10-17 | A kind of filter circuit based on capacitive sensing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903982.4A CN107959481A (en) | 2016-10-17 | 2016-10-17 | A kind of filter circuit based on capacitive sensing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107959481A true CN107959481A (en) | 2018-04-24 |
Family
ID=61953300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610903982.4A Pending CN107959481A (en) | 2016-10-17 | 2016-10-17 | A kind of filter circuit based on capacitive sensing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107959481A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877484A (en) * | 2010-04-06 | 2010-11-03 | 瑞声声学科技(深圳)有限公司 | Filter circuit |
| US7956680B2 (en) * | 2008-07-07 | 2011-06-07 | Mediatek Inc. | Low-noise DC offset calibration circuit and related receiver stage |
| CN204993261U (en) * | 2015-09-30 | 2016-01-20 | 深圳市恒晨电器有限公司 | Linear amplifier circuit of on -vehicle audio frequency of single power low -voltage work |
| CN105450203A (en) * | 2015-11-13 | 2016-03-30 | 得理电子(上海)有限公司 | Interference filtering device and interference filtering method for rapid on-off mechanical switches |
-
2016
- 2016-10-17 CN CN201610903982.4A patent/CN107959481A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7956680B2 (en) * | 2008-07-07 | 2011-06-07 | Mediatek Inc. | Low-noise DC offset calibration circuit and related receiver stage |
| CN101877484A (en) * | 2010-04-06 | 2010-11-03 | 瑞声声学科技(深圳)有限公司 | Filter circuit |
| CN204993261U (en) * | 2015-09-30 | 2016-01-20 | 深圳市恒晨电器有限公司 | Linear amplifier circuit of on -vehicle audio frequency of single power low -voltage work |
| CN105450203A (en) * | 2015-11-13 | 2016-03-30 | 得理电子(上海)有限公司 | Interference filtering device and interference filtering method for rapid on-off mechanical switches |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180424 |