CN102035500B - High anti-interference high-pass amplifier - Google Patents
High anti-interference high-pass amplifier Download PDFInfo
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- CN102035500B CN102035500B CN200910044495.7A CN200910044495A CN102035500B CN 102035500 B CN102035500 B CN 102035500B CN 200910044495 A CN200910044495 A CN 200910044495A CN 102035500 B CN102035500 B CN 102035500B
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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 pass amplifier, especially high anti-interference pass amplifier.
Background technology
At present, in the loop of the well-known signal coexistence at multi-frequency, get rid of the interference of low frequency component signal, adopt pass amplifier generally can be achieved preferably.But in having the loop of magnetic-core circuit, effect due to power frequency heavy-current, magnetic core can enter saturation condition after departing from magnetization linear zone, and then in the magnetization inelastic region of core material, produces than the interference signal of the industrial frequency harmonic component of large thousands of times of useful signal intensity.Existing capacitance-resistance high pass circuit (1) output is electrically connected to operational amplifier (2) input, negative-feedback circuit (4) input is electrically connected to operational amplifier (2) output (M), the high pass filter that negative-feedback circuit (4) output is electrically connected to operational amplifier (2) input all cannot this high-intensity interference signal of filtering, last can be caused the useful disturbed signal of higher frequency signals to flood, cause circuit cisco unity malfunction.
Summary of the invention
In order to overcome existing pass amplifier, cannot filtering in the magnetization non-linear region of core material, produce the defect that causes circuit cisco unity malfunction than the interference signal of the industrial frequency harmonic component of large thousands of times of useful signal intensity.The invention provides a kind of pass amplifier, this pass amplifier can not only filtering low frequency signal, and well filtering than the interference signal of the industrial frequency harmonic component of large 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 to operational amplifier (2) output (M), and the output of detection feedback circuit (3) is electrically connected to operational amplifier (2) input.Diode (T1) positive pole in detection feedback circuit (3) is electrically connected to the input of detection feedback circuit (3), electric capacity (C3) one end in detection feedback circuit (3) is electrically connected to the output of detection feedback circuit (3), electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) one end are electrically connected to resistance (R4) one end respectively, and electric capacity (C4) other end, resistance (R4) other end are electrically connected to negative supply (Ec) respectively.Electric capacity (C1) one end in capacitance-resistance high pass circuit (1), one end of resistance (R1) are electrically connected to the in-phase input end of operational amplifier (2), the output (M) of operational amplifier (2) is electrically connected to electric capacity (C2) one end, resistance (R3) one end in negative-feedback circuit (4) respectively, and electric capacity (C2) other end in negative-feedback circuit (4), resistance (R3) other end, resistance (R2) one end are electrically connected to the inverting input of operational amplifier (2).When the signal of multi-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 again the in-phase input end of operational amplifier (2), then signal amplifies and processes through operational amplifier (2), the a part of inverting input that feeds back to operational amplifier (2) through negative-feedback circuit (4), play and improve amplifier job stability and the effect to the preliminary establishment of amplifier gain, and another part 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 after the high frequency composition after diode (T1) detection, will there is a low-frequency harmonics signal at diode (T1) negative pole, this signal is that industrial frequency harmonic interference signal just, the inverting input that this signal is fed back to operational amplifier (2) through electric capacity (C3) forms powerful negative feedback, make operational amplifier (2) to the multiplication factor of its industrial frequency harmonic interference signal close to 1, and the higher frequency signals higher than industrial frequency harmonic interference signal frequency has been obtained to sufficient amplification, so, the signal to noise ratio of circuit has greatly been improved, make that covered useful high-frequency signal highlight and can directly apply, thereby reach well filtering than the object of the interference signal of the industrial frequency harmonic component of large thousands of times of useful signal intensity.
The invention has the beneficial effects as follows, circuit is large, simple and reliable to the decay of industrial frequency harmonic interference signal, and cost is low practical.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is functional-block diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
1. capacitance-resistance high pass circuits in figure, 2. operational amplifier, 3. detection feedback circuit, 4. negative-feedback circuit.
Embodiment
In the embodiment shown in Figure 2, electric capacity (C1) one end in capacitance-resistance high pass circuit (1), one end of resistance (R1) is electrically connected to the in-phase input end of operational amplifier (2), the input point (N) of capacitance-resistance high pass circuit (1) is electrically connected to electric capacity (C1) other end in capacitance-resistance high pass circuit (1), the output (M) of operational amplifier (2) with respectively with negative-feedback circuit (4) in electric capacity (C2) one end, resistance (R3) one end is electrically connected to, electric capacity (C2) other end in negative-feedback circuit (4), resistance (R3) other end, resistance (R2) one end is electrically connected to the inverting input of operational amplifier (2), the other end of resistance (R2) other end and resistance (R1) in capacitance-resistance high pass circuit (1) jointly be electrically connected to, diode (T1) positive pole in detection feedback circuit (3) is electrically connected to the output (M) of operational amplifier (2), electric capacity (C3) one end in detection feedback circuit (3) is electrically connected to the inverting input of operational amplifier (2), electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) one end is electrically connected to resistance (R4) one end respectively, electric capacity (C4) other end, resistance (R4) other end is electrically connected to negative supply (Ec) respectively.
Claims (2)
1. one kind high anti-interference pass amplifier, in circuit board, capacitance-resistance high pass circuit (1) output is electrically connected to operational amplifier (2) input, negative-feedback circuit (4) input is electrically connected to operational amplifier (2) output (M), negative-feedback circuit (4) output is electrically connected to operational amplifier (2) input, it is characterized in that: diode (T1) positive pole in detection feedback circuit (3) is electrically connected to the input of detection feedback circuit (3), the input of detection feedback circuit (3) is electrically connected to operational amplifier (2) output (M), electric capacity (C3) one end in detection feedback circuit (3) is electrically connected to the output of detection feedback circuit (3), the output of detection feedback circuit (3) is electrically connected to operational amplifier (2) input, electric capacity (C3) other end, diode (T1) negative pole, electric capacity (C4) one end is electrically connected to resistance (R4) one end respectively, electric capacity (C4) other end, resistance (R4) other end is electrically connected to negative supply (Ec) respectively, electric capacity (C3) is feedback capacity, electric capacity (C4) is high-frequency filter capacitor.
2. the anti-interference pass amplifier of height according to claim 1, is characterized in that: the output of detection feedback circuit (3) is electrically connected to operational amplifier (2) input, and this operational amplifier (2) input is 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 CN102035500A (en) | 2011-04-27 |
| CN102035500B true CN102035500B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910044495.7A Expired - Fee Related CN102035500B (en) | 2009-10-01 | 2009-10-01 | High anti-interference high-pass amplifier |
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Families Citing this family (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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1415134A (en) * | 2000-01-03 | 2003-04-30 | 皇冠音频公司 | Remote sensing technology high-order filtering |
| CN101001080A (en) * | 2006-12-31 | 2007-07-18 | 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 |
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2009
- 2009-10-01 CN CN200910044495.7A patent/CN102035500B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1415134A (en) * | 2000-01-03 | 2003-04-30 | 皇冠音频公司 | Remote sensing technology high-order filtering |
| CN101001080A (en) * | 2006-12-31 | 2007-07-18 | 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 |
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| CN102035500A (en) | 2011-04-27 |
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