CN105978567B - A kind of circuit with filtering and A/D conversion function - Google Patents
A kind of circuit with filtering and A/D conversion function Download PDFInfo
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- CN105978567B CN105978567B CN201610289437.0A CN201610289437A CN105978567B CN 105978567 B CN105978567 B CN 105978567B CN 201610289437 A CN201610289437 A CN 201610289437A CN 105978567 B CN105978567 B CN 105978567B
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- filtering
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The invention belongs to signal processing circuit fields, especially relate to a kind of circuit with filtering and A/D conversion function that can be filtered to analog signal and analog/digital conversion is handled.It is proposed by the present invention that there is the circuit of filtering and A/D conversion function to specifically include subtraction circuit, filter circuit, add circuit, sampling hold circuit, A/D conversion circuit and clock circuit composition, specific connection type are as follows: analog voltage signal is connected to the positive input terminal of subtraction circuit, and the output of sampling hold circuit is connected to the negative input end of subtraction circuit；The input terminal of filter circuit and the output end of subtraction circuit link together.The present invention can effectively protrude the influence of interference signal from input signal, and then be filtered out using filter circuit, have excellent filter effect.
Description
Technical field
The invention belongs to signal processing circuit field, analog signal can be filtered and mould by especially relating to one kind
The circuit with filtering and A/D conversion function of quasi-/digital conversion process.
Background technique
In the course of work of automation equipment, need that extraneous physical quantity is converted to electrical simulation using sensor
Signal, due to it is unavoidable in analog signal include a large amount of interference, it is therefore necessary to first it is filtered, so
It just can be carried out other operations such as signal conversion or analysis afterwards.Existing hardware filtering circuit mainly has digital filter device, single order low
Logical or step low-pass active filter etc. is several, and although these filters can effectively eliminate interference signal, make analog signal
Waveform it is more smooth, but this also result in filtered voltage waveform there are wave distortion, phase of ac signal lag etc.
Problem, these defects limit the application range of hardware filtering circuit in practice.
Summary of the invention
It is an object of the invention to propose that one kind can wave distortion, phase before and after effectively solving analog voltage signal filtering
Under the premise of the problems such as after steric retardation, it is fast and efficiently filtered, and finally realizes the tool of analog/digital conversion
There is the circuit of filtering and A/D conversion function.
The object of the present invention is achieved like this
The circuit with filtering and A/D conversion function proposed by the present invention specifically includes subtraction circuit, filtered electrical
Road, add circuit, sampling hold circuit, A/D conversion circuit and clock circuit are constituted, specific connection type are as follows: simulation
Voltage signal is connected to the positive input terminal of subtraction circuit, and the output of sampling hold circuit is connected to the negative input end of subtraction circuit；Filtering
The input terminal of circuit and the output end of subtraction circuit link together；The output of one input terminal and filter circuit of add circuit
End links together, and the output end of another input terminal and sampling hold circuit links together；A/D conversion circuit
The output end of input end of analog signal and add circuit links together, the output end of A/D conversion circuit be it is extraneous its
His circuit provides the digital signal after conversion；The signal input part of sampling hold circuit and the output end of add circuit are connected to one
It rises；Clock circuit provides clock signal necessary to its work for sampling hold circuit and A/D conversion circuit.
The beneficial effects of the present invention are:
(1) circuit with filtering and A/D conversion function proposed by the present invention, will currently be provided by external circuitry
Analog voltage signal made comparisons with filtered analog voltage signal of the upper clock cycle, subtracted by subtraction circuit identical
Part, obtain the variable quantity of voltage, i.e. voltage increment, using this processing method, can effectively dash forward from input signal
The influence of interference signal out, and then filtered out using filter circuit, therefore this circuit proposed by the present invention is with excellent
Filter effect.
(2) in the circuit with filtering and A/D conversion function proposed by the present invention, although filter circuit is also deposited
In Time Delay, but the time lag only has a certain impact to voltage increment signal, by filtered voltage increment signal
It to be also added, can be just obtained by filtered current analog voltage with filtered analog voltage signal of the upper clock cycle
Signal, since the amplitude of voltage increment signal is relatively small, so the filtered analog voltage signal of add circuit output is not
There are apparent time delays for meeting.The clock signal frequency of clock circuit output is higher, and the amplitude of voltage increment signal will
It is smaller, it will be better to the inhibition of time delay.
(3) in the circuit with filtering and A/D conversion function proposed by the present invention, clock circuit is simultaneously mould
Quasi-/digital conversion circuit and sampling hold circuit provide clock signal, it can be ensured that are modeled/the filter of digital conversion circuit conversion
Voltage signal after wave simultaneously by sampling hold circuit sampling, keep, and then within next clock cycle, subtraction circuit and plus
Method circuit generates voltage increment signal and filtered voltage signal, realizes filtering and mould all on the basis of the voltage signal
The continuity of signal used by quasi-/number is converted.
Detailed description of the invention
Fig. 1 has the structural block diagram of the circuit of filtering and A/D conversion function.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
It is proposed by the present invention that there is the operation logic of the circuit of filtering and A/D conversion function during the work time such as
It is lower described:
(1) within some clock cycle (clock cycle is determined by the output clock signal of clock circuit), subtraction circuit
It (is adopted currently filtered analog voltage signal of the upper clock cycle was subtracted by the analog voltage signal that external circuitry provides
The output signal of sample holding circuit, it is understood that once be simulated/digital analog voltage signal to be preceding), difference
(i.e. the output signal of subtraction circuit) be analog voltage signal currently entered and last filtered analog voltage signal it
Between voltage increment, if external circuitry provide analog voltage signal in there are interference signal, which necessarily deposits
It is in the voltage increment signal of subtraction circuit output；
(2) the voltage increment signal that subtraction circuit exports is filtered using filter circuit, due to the change of interference signal
Change amplitude is much larger than the variation for the voltage increment signal not interfered with (for the analog voltage signal for the consecutive variations not interfered with
For, the variation of voltage increment is necessarily by a small margin and continuously), therefore designing reasonable filter circuit will necessarily be effectively
Filtering interference signals；
(3) filtered voltage increment by add circuit again with filtered analog voltage signal of the upper clock cycle
It is added, has just obtained by filtered current analog voltage signal；
(4) when the next clock signal generated by clock circuit arrives, A/D conversion circuit and sampling are kept
Circuit is concurrently triggered, and A/D conversion circuit is converted to by filtered current analog voltage signal, and sampling is protected
It holds circuit and carries out sampling holding to by filtered current analog voltage signal；
(5) as time goes by, clock circuit generates continuous clock signal, and above procedure constantly repeats, in turn
Realize the filtering and analog/digital conversion processing to analog voltage signal.
It is proposed by the present invention that there is the circuit of filtering and A/D conversion function in the first clock week to work on power
In phase, since the output of sampling hold circuit has uncertainty, will lead to filter effect has biggish error, but passes through several
After a clock cycle, which will be effectively eliminated.Therefore when the number letter that external circuitry is provided using circuit of the invention
Number when, first few data can be cast out by the methods of software programming, and then the error for avoiding powering on initial time influences.
Embodiment one
Subtraction circuit can be used using integrated operational amplifier as the subtraction circuit of core and realize, operation therein is put
The chips such as OP07 can be selected in big device；
Add circuit can be used using integrated operational amplifier as the adder operation circuit of core and realize, operation therein is put
The chips such as OP07 can be selected in big device；
Filter circuit can select existing various filter circuits, such as the resistance being made of resistance and capacitor according to actual needs
Capacitor filter circuit etc.；
Sampling hold circuit can be aided with peripheral circuit using the existing various chips for having sampling, keeping function come real
It is existing, such as AD582 chip, LF198 chip etc.；
A/D conversion circuit can be aided with peripheral circuit using existing various A/D conversion chips come real
It is existing, such as ADC0809, AD7810 etc., it is ensured that the working frequency of A/D conversion circuit and the work of sampling hold circuit
Frequency is consistent；
The existing various circuits that can generate stable clock signal or device can be used to realize in clock circuit, such as sleeping
Formula crystal oscillator etc., the frequency of clock signal allow for meeting the needs of sampling hold circuit and A/D conversion circuit.
Claims (1)
1. a kind of circuit with filtering and A/D conversion function, including subtraction circuit, filter circuit, add circuit, adopt
Sample holding circuit, A/D conversion circuit and clock circuit are constituted, it is characterised in that: analog voltage signal is connected to subtraction electricity
The positive input terminal on road, the output of sampling hold circuit are connected to the negative input end of subtraction circuit；The input terminal and subtraction of filter circuit
The output end of circuit links together；One input terminal of add circuit and the output end of filter circuit link together, another
The output end of a input terminal and sampling hold circuit links together；The input end of analog signal of A/D conversion circuit with
The output end of add circuit links together, after the output end of A/D conversion circuit provides conversion for other extraneous circuits
Digital signal；The signal input part of sampling hold circuit and the output end of add circuit link together；Clock circuit is to adopt
Sample holding circuit and A/D conversion circuit provide clock signal necessary to its work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610289437.0A CN105978567B (en) | 2016-05-04 | 2016-05-04 | A kind of circuit with filtering and A/D conversion function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610289437.0A CN105978567B (en) | 2016-05-04 | 2016-05-04 | A kind of circuit with filtering and A/D conversion function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105978567A CN105978567A (en) | 2016-09-28 |
| CN105978567B true CN105978567B (en) | 2019-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610289437.0A Active CN105978567B (en) | 2016-05-04 | 2016-05-04 | A kind of circuit with filtering and A/D conversion function |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101120507A (en) * | 2005-02-15 | 2008-02-06 | 皇家飞利浦电子股份有限公司 | AD converter arrangement |
| CN101313463A (en) * | 2005-09-28 | 2008-11-26 | 高通股份有限公司 | DC offset cancellation circuit for a receiver |
| CN102801425A (en) * | 2012-09-07 | 2012-11-28 | 电子科技大学 | Dual-voltage-controlled oscillator loop-based Sigma-Delta analog to digital converter |
| CN103137408A (en) * | 2011-11-30 | 2013-06-05 | 中国科学院微电子研究所 | Radio frequency power supply with precision power detector |
| CN104579346A (en) * | 2013-10-09 | 2015-04-29 | 恩智浦有限公司 | Analogue to digital converter |
-
2016
- 2016-05-04 CN CN201610289437.0A patent/CN105978567B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101120507A (en) * | 2005-02-15 | 2008-02-06 | 皇家飞利浦电子股份有限公司 | AD converter arrangement |
| CN101313463A (en) * | 2005-09-28 | 2008-11-26 | 高通股份有限公司 | DC offset cancellation circuit for a receiver |
| CN103137408A (en) * | 2011-11-30 | 2013-06-05 | 中国科学院微电子研究所 | Radio frequency power supply with precision power detector |
| CN102801425A (en) * | 2012-09-07 | 2012-11-28 | 电子科技大学 | Dual-voltage-controlled oscillator loop-based Sigma-Delta analog to digital converter |
| CN104579346A (en) * | 2013-10-09 | 2015-04-29 | 恩智浦有限公司 | Analogue to digital converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105978567A (en) | 2016-09-28 |
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