CN102035500A - High anti-interference high-pass amplifier - Google Patents
High anti-interference high-pass amplifier Download PDFInfo
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- CN102035500A CN102035500A CN2009100444957A CN200910044495A CN102035500A CN 102035500 A CN102035500 A CN 102035500A CN 2009100444957 A CN2009100444957 A CN 2009100444957A CN 200910044495 A CN200910044495 A CN 200910044495A CN 102035500 A CN102035500 A CN 102035500A
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Abstract
The invention discloses a high anti-interference high-pass amplifier. In a circuit board, the output end of a resistance-capacitance high-pass circuit (1) is electrically connected with the input end of an operational amplifier (2), and the output end of the operational amplifier (2) is electrically connected with the input end of a negative feedback circuit (4); the anode of a diode (T1) in a detection feedback circuit (3) is electrically connected with the output end (M) of the operational amplifier (2); one end of a capacitor (C3), the cathode of the diode (T1) and one end of a capacitor (C4) are electrically connected with one end of a resistor (R4) respectively; the other end of the capacitor (C4) and the other end of the resistor (R4) are electrically connected with a negative power supply (-Ec) respectively; and the other end of the capacitor (C3) in the detection feedback circuit (3) is electrically connected with the opposite phase input end of the operational amplifier (2). Therefore, highlight submerged useful high-frequency signals can be directly applied so as to fulfill the purpose of well filtering interference signals of power frequency harmonic components, the strength of which is thousands of times more than that of the useful signals.
Description
Affiliated technical field
The present invention relates to a kind of high pass amplifier, especially high anti-interference high pass amplifier.
Background technology
At present, as everyone knows in the loop of the signal coexistence of multiple frequency, get rid of the interference of low frequency component signal, adopt the high pass amplifier generally can both be achieved preferably.But in the loop of magnetic-core circuit is arranged, because the effect of the big electric current of power frequency, magnetic core can enter saturation condition after breaking away from the magnetization linear zone, and then produces the interference signal than the industrial frequency harmonic component of big thousands of times of useful signal intensity in the magnetization inelastic region of core material.Existing capacitance-resistance high pass circuit (1) output is electrically connected with operational amplifier (2) input, negative-feedback circuit (4) input is electrically connected with operational amplifier (2) output (M), the high pass filter that negative-feedback circuit (4) output is electrically connected with operational amplifier (2) input all can't this high-intensity interference signal of filtering, last can be caused the useful disturbed signal of higher frequency signals to flood, cause the circuit cisco unity malfunction.
Summary of the invention
Can't filtering produce the defect that causes the circuit cisco unity malfunction than the interference signal of the industrial frequency harmonic component of big thousands of times of useful signal intensity in order to overcome existing high pass amplifier at the magnetization non-linear region of core material.The invention provides a kind of high pass amplifier, this high pass amplifier can not only the filtering low frequency signal, and well filtering than the interference signal of the industrial frequency harmonic component of big thousands of times of useful signal intensity.
The present invention solves the technical scheme that its problem adopts: the input of detection feedback circuit (3) is electrically connected with operational amplifier (2) output (M), and the output of detection feedback circuit (3) is electrically connected with operational amplifier (2) input.Diode (T1) in the detection feedback circuit (3) is anodal to be electrically connected with the input of detection feedback circuit (3), electric capacity (C3) end in the detection feedback circuit (3) is electrically connected with the output of detection feedback circuit (3), electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) end are electrically connected with resistance (R4) end respectively, and electric capacity (C4) other end, resistance (R4) other end (Ec) are electrically connected with negative supply respectively.Electric capacity (C1) end in the capacitance-resistance high pass circuit (1), an end of resistance (R1) are electrically connected with the in-phase input end of operational amplifier (2), the output (M) of operational amplifier (2) is electrically connected with electric capacity (C2) end, resistance (R3) end in the negative-feedback circuit (4) respectively, and electric capacity (C2) other end in the negative-feedback circuit (4), resistance (R3) other end, resistance (R2) end are electrically connected with the inverting input of operational amplifier (2).When the signal of multiple frequency flows into from capacitance-resistance high pass circuit (1) input point (N), after capacitance-resistance high pass circuit (1) is first to low frequency signals decay filtering, reach the in-phase input end of operational amplifier (2) again, signal is through operational amplifier (2) processing and amplifying then, the a part of inverting input that feeds back to operational amplifier (2) through negative-feedback circuit (4), play the effect of the preliminary establishment that improves amplifier job stability and pair amplifier gain, and another partly signal input detection feedback circuit (3) detection, resistance (R4) is the biasing resistor of diode (T1), electric capacity (C4) is high-frequency filter capacitor, electric capacity (C4) and resistance (R4) filter out behind the high frequency composition after diode (T1) detection, will a low-frequency harmonics signal appear at diode (T1) negative pole, this signal is that industrial frequency harmonic interference signal just, this signal is formed powerful negative feedback through the inverting input that electric capacity (C3) feeds back to operational amplifier (2), make operational amplifier (2) approach 1 to the multiplication factor of its industrial frequency harmonic interference signal, and the higher frequency signals that is higher than industrial frequency harmonic interference signal frequency has been obtained sufficient amplification, so, the signal to noise ratio of circuit has greatly been improved, make that covered useful high-frequency signal highlight and directly to use, thereby reach well filtering than the purpose of the interference signal of the industrial frequency harmonic component of big thousands of times of useful signal intensity.
The invention has the beneficial effects as follows that circuit is big, simple and reliable to the decay of industrial frequency harmonic interference signal, and cost is low practical.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a functional-block diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
1. capacitance-resistance high pass circuits among the figure, 2. operational amplifier, 3. detection feedback circuit, 4. negative-feedback circuit.
Embodiment
In the embodiment shown in Figure 2, electric capacity (C1) end in the capacitance-resistance high pass circuit (1), one end of resistance (R1) is electrically connected with the in-phase input end of operational amplifier (2), the input point (N) of capacitance-resistance high pass circuit (1) is electrically connected with electric capacity (C1) other end in the capacitance-resistance high pass circuit (1), the output (M) of operational amplifier (2) with respectively with negative-feedback circuit (4) in electric capacity (C2) end, resistance (R3) end is electrically connected, electric capacity (C2) other end in the negative-feedback circuit (4), resistance (R3) other end, resistance (R2) end is electrically connected with the inverting input of operational amplifier (2), the other end of the resistance (R1) in resistance (R2) other end and the capacitance-resistance high pass circuit (1) jointly be electrically connected, diode (T1) in the detection feedback circuit (3) is anodal to be electrically connected with the output (M) of operational amplifier (2), electric capacity (C3) end in the detection feedback circuit (3) is electrically connected with the inverting input of operational amplifier (2), electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) end is electrically connected with resistance (R4) end respectively, electric capacity (C4) other end, resistance (R4) other end (Ec) is electrically connected with negative supply respectively.
Claims (3)
1. one kind high anti-interference high pass amplifier, in circuit board, capacitance-resistance high pass circuit (1) output is electrically connected with operational amplifier (2) input, negative-feedback circuit (4) input is electrically connected with operational amplifier (2) output (M), negative-feedback circuit (4) output is electrically connected with operational amplifier (2) input, it is characterized in that: the input of detection feedback circuit (3) is electrically connected with operational amplifier (2) output (M), and the output of detection feedback circuit (3) is electrically connected with operational amplifier (2) input.
2. the anti-interference high pass amplifier of height according to claim 1, it is characterized in that: the diode (T1) in the detection feedback circuit (3) is anodal to be electrically connected with the input of detection feedback circuit (3), electric capacity (C3) end in the detection feedback circuit (3) is electrically connected with the output of detection feedback circuit (3), electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) end are electrically connected with resistance (R4) end respectively, and electric capacity (C4) other end, resistance (R4) other end (Ec) are electrically connected with negative supply respectively.
3. the anti-interference high pass amplifier of height according to claim 1 is characterized in that: the output of detection feedback circuit (3) is electrically connected with operational amplifier (2) inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910044495.7A CN102035500B (en) | 2009-10-01 | 2009-10-01 | High anti-interference high-pass amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910044495.7A CN102035500B (en) | 2009-10-01 | 2009-10-01 | High anti-interference high-pass amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102035500A true CN102035500A (en) | 2011-04-27 |
| CN102035500B CN102035500B (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910044495.7A Expired - Fee Related CN102035500B (en) | 2009-10-01 | 2009-10-01 | High anti-interference high-pass amplifier |
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| Country | Link |
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| CN (1) | CN102035500B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269203A (en) * | 2013-06-05 | 2013-08-28 | 歌尔声学股份有限公司 | Biasing circuit of operational amplifier |
| CN103633956A (en) * | 2013-12-18 | 2014-03-12 | 浙江天地人科技有限公司 | Charge amplifier |
| CN105021842A (en) * | 2015-07-08 | 2015-11-04 | 无锡市崇安区科技创业服务中心 | Latitude and longitude vehicle speed measuring system based on filter circuit |
| CN105022078A (en) * | 2015-07-08 | 2015-11-04 | 无锡市崇安区科技创业服务中心 | Latitude and longitude vehicle spacing measuring system based on filter circuit |
| CN108574474A (en) * | 2018-07-12 | 2018-09-25 | 鲁东大学 | A kind of circuit that corrected impulse signal influences instrument and meter detection |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001050582A1 (en) * | 2000-01-03 | 2001-07-12 | Crown Audio, Inc. | Remote sensing by high-order filtering |
| CN100442657C (en) * | 2006-12-31 | 2008-12-10 | 南京航空航天大学 | Programme-controlled gain charge amplifier based on computer system bus |
| CN201616810U (en) * | 2009-10-01 | 2010-10-27 | 邓加慧 | High anti-interference high-pass amplifier |
-
2009
- 2009-10-01 CN CN200910044495.7A patent/CN102035500B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269203A (en) * | 2013-06-05 | 2013-08-28 | 歌尔声学股份有限公司 | Biasing circuit of operational amplifier |
| CN103633956A (en) * | 2013-12-18 | 2014-03-12 | 浙江天地人科技有限公司 | Charge amplifier |
| CN105021842A (en) * | 2015-07-08 | 2015-11-04 | 无锡市崇安区科技创业服务中心 | Latitude and longitude vehicle speed measuring system based on filter circuit |
| CN105022078A (en) * | 2015-07-08 | 2015-11-04 | 无锡市崇安区科技创业服务中心 | Latitude and longitude vehicle spacing measuring system based on filter circuit |
| CN108574474A (en) * | 2018-07-12 | 2018-09-25 | 鲁东大学 | A kind of circuit that corrected impulse signal influences instrument and meter detection |
| CN108574474B (en) * | 2018-07-12 | 2023-08-08 | 鲁东大学 | Circuit for correcting influence of pulse signal on detection of instrument and meter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102035500B (en) | 2014-03-12 |
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Granted publication date: 20140312 Termination date: 20141001 |
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