CN203933540U - A kind of amplifier - Google Patents
A kind of amplifier Download PDFInfo
- Publication number
- CN203933540U CN203933540U CN201420336305.5U CN201420336305U CN203933540U CN 203933540 U CN203933540 U CN 203933540U CN 201420336305 U CN201420336305 U CN 201420336305U CN 203933540 U CN203933540 U CN 203933540U
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- resistance
- amplification chip
- circuit
- voltage
- amplifier
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Abstract
The utility model discloses a kind of amplifier, adopt three amplification chips to carry out three-stage cascade, form third stage amplifier, meet the multiplication factor of circuit; The input of the first order seals in resistance, the first amplification chip is simultaneously in parallel with a resistance, thereby the input resistance of increasing circuit, reduce the electric current that amplifying circuit is asked for from signal source, make circuit obtain complete input voltage, the high-pass filtering circuit that adds low-pass filter circuit, the 7th resistance and the second electric capacity composition of the first electric capacity and the 5th resistance composition between the second level and the third level, reduce the noise of whole circuit, circuit output end connects the 9th resistance of ground connection, reduce the output resistance of whole circuit, the load capacity of intensifier circuit.
Description
Technical field
The utility model discloses a kind of amplifier, relate to signal amplification sector.
Background technology
Amplifier is a kind of device that increases signal amplitude or power, and it is the critical elements of processing signals in automation equipment.The amplification of amplifier is controlled the energy with input signal and is realized, and amplifying required power consumption is provided by the energy.
Development along with communication system technology, radio-frequency technique is also more and more higher to the requirement of amplifier, especially in the parameters such as signal to noise ratio, gain amplifier, bandwidth, have higher requirement, so having the demand of the amplifier in high broadband gets more and more, existing amplifier comprises preamplifying circuit, rear class amplifying circuit, the amplification of AGC automatic gain etc., and rear class amplifying circuit further increases multiplication factor, expands output current, the load capacity of boost amplifier, improves output voltage amplitude.
Amplifier is widely used basic analog circuit, be mainly used in the amplification of small-signal, key property index has gain coefficient, input resistance, output resistance, passband etc., according to different performance requirements, select different integrated transporting dischargings as amplifying device, its gain bandwidth product of different integrated transporting dischargings is different constant, and input resistance is decided by the first order, and output resistance is decided by afterbody.
The input resistance of existing amplifier is large not, and its electric current of asking for from signal source will become greatly, thereby makes input voltage be not equal to the virtual voltage of signal, causes the multiplication factor of circuit just cannot meet; Output resistance is not little simultaneously, and its load capacity is strong not, also cannot meet the multiplication factor of circuit, and this is current problem demanding prompt solution.
Utility model content
Technical problem to be solved in the utility model is: for the defect of prior art, provide a kind of amplifier, adopt three amplification chips to carry out three-stage cascade, form third stage amplifier, meet the multiplication factor of circuit; The input of the first order seals in resistance, the first amplification chip is simultaneously in parallel with a resistance, thereby the input resistance of increasing circuit, reduce the electric current that amplifying circuit is asked for from signal source, make circuit obtain complete input voltage, the high-pass filtering circuit that adds low-pass filter circuit, the 7th resistance and the second electric capacity composition of the first electric capacity and the 5th resistance composition between the second level and the third level, reduce the noise of whole circuit, circuit output end connects the 9th resistance of ground connection, reduce the output resistance of whole circuit, the load capacity of intensifier circuit.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
An amplifier, comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first inductance, the second inductance, the first amplification chip, the second amplification chip and the 3rd amplification chip;
Wherein the inverting input of the first amplification chip is connected with one end of the second resistance with one end of the first resistance respectively, the positive input ground connection of the first amplification chip, the positive voltage terminal of the first amplification chip is connected respectively the first voltage and second voltage with negative voltage side, and the output of the first amplification chip connects respectively one end of the other end and the 3rd resistance of the second resistance;
The other end of the 3rd resistance connects respectively one end of inverting input and the 4th resistance of the second amplification chip;
The positive input end grounding of the second amplification chip, the positive voltage terminal of the second amplification chip is connected respectively the first voltage and second voltage with negative voltage side, and the output of the second amplification chip connects respectively one end of the other end and first inductance of the 4th resistance;
The other end of the first inductance connects respectively one end of the 7th resistance and one end of the 5th resistance;
The other end of the 7th resistance connects respectively one end of the second inductance and the normal phase input end of the 3rd amplification chip;
The inverting input of the 3rd amplification chip connects respectively one end of the 6th resistance and one end of the 8th resistance;
The other end ground connection of the 6th resistance, the output of the 3rd described amplification chip connects respectively one end of the other end and the 9th resistance of the 8th resistance;
The positive voltage terminal of described the 3rd amplification chip is connected respectively the first voltage and second voltage with negative voltage side;
The other end of described the second inductance connects respectively the other end of the 5th resistance and the other end of the 9th resistance.
As further prioritization scheme of the present utility model, described the first amplification chip, the second amplification chip and the 3rd amplification chip all adopt chip LM324AD.
As further prioritization scheme of the present utility model, described the first voltage is+20V direct voltage that described second voltage is-20V direct voltage.
As further prioritization scheme of the present utility model, described the first electric capacity and the 5th resistance form low-pass filter circuit.
As further prioritization scheme of the present utility model, described the 7th resistance and the second inductance form high-pass filtering circuit.
As further prioritization scheme of the present utility model, described the 9th resistance is as load resistance, and its resistance is 1K Ω.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
First: the utility model adopts three amplification chips to carry out three-stage cascade, forms third stage amplifier, meets the multiplication factor of circuit; The input of the first order seals in resistance, and the first amplification chip is simultaneously in parallel with a resistance, thereby the input resistance of increasing circuit reduces the electric current that amplifying circuit is asked for from signal source, makes circuit obtain complete input voltage;
Second: between the utility model second level and the third level, add the high-pass filtering circuit of low-pass filter circuit, the 7th resistance and the second electric capacity composition of the first electric capacity and the 5th resistance composition, reduce the noise of whole circuit;
The the 3rd: the utility model circuit output end connects the 9th resistance of ground connection, reduce the output resistance of whole circuit, the load capacity of intensifier circuit.
Accompanying drawing explanation
Fig. 1, construction module schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Describe execution mode of the present utility model below in detail, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the execution mode being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
The utility model discloses a kind of amplifier, as shown in Figure 1, comprise the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the first capacitor C 1, the second capacitor C 2, the first amplification chip T1, the second amplification chip T2 and the 3rd amplification chip T3;
Wherein the inverting input of the first amplification chip T1 is connected with one end of the second resistance R 2 with one end of the first resistance R 1 respectively, the positive input ground connection of the first amplification chip T1, the positive voltage terminal of the first amplification chip T1 is connected respectively the first voltage and second voltage with negative voltage side, and the output of the first amplification chip T1 connects respectively the other end of the second resistance R 2 and one end of the 3rd resistance R 3;
The other end of the 3rd resistance R 3 connects respectively the inverting input of the second amplification chip T2 and one end of the 4th resistance R 4;
The positive input end grounding of the second amplification chip T2, the positive voltage terminal of the second amplification chip T2 is connected respectively the first voltage and second voltage with negative voltage side, and the output of the second amplification chip T2 connects respectively the other end of the 4th resistance R 4 and one end of the first capacitor C 1;
The other end of the first capacitor C 1 connects respectively one end of the 7th resistance R 7 and one end of the 5th resistance R 5;
The other end of the 7th resistance R 7 connects respectively one end of the second capacitor C 2 and the normal phase input end of the 3rd amplification chip T3;
The inverting input of the 3rd amplification chip T3 connects respectively one end of the 6th resistance R 6 and one end of the 8th resistance R 8;
The other end ground connection of the 6th resistance R 6, the output of the 3rd described amplification chip T3 connects respectively the other end of the 8th resistance R 8 and one end of the 9th resistance R 9;
The positive voltage terminal of described the 3rd amplification chip T3 is connected respectively the first voltage and second voltage with negative voltage side;
The other end of described the second capacitor C 2 connects respectively the other end of the 5th resistance R 5 and the other end of the 9th resistance R 9.
As further prioritization scheme of the present utility model, described the first amplification chip T1, the second amplification chip T2 and the 3rd amplification chip T3 all adopt chip CM324AD.
As further prioritization scheme of the present utility model, described the first voltage is+20V direct voltage that described second voltage is-20V direct voltage.
As further prioritization scheme of the present utility model, described the first capacitor C 1 and the 5th resistance R 5 form low-pass filter circuit.
As further prioritization scheme of the present utility model, described the 7th resistance R 7 and the second capacitor C 2 form high-pass filtering circuit.
As further prioritization scheme of the present utility model, described the 9th resistance R 9 is as load resistance, and its resistance is 1K Ω.
The utility model adopts three amplification chips to carry out three-stage cascade, forms third stage amplifier, meets the multiplication factor of circuit; The input of the first order seals in the first resistance R 1, the first amplification chip T1 is simultaneously in parallel with the second resistance R 2, thereby the input resistance of increasing circuit, reduce the electric current that amplifying circuit is asked for from signal source, make circuit obtain complete input voltage, the high-pass filtering circuit that low-pass filter circuit, the 7th resistance R 7 and the second electric capacity that adds the first electric capacity and the 5th resistance R 5 to form between the second level and the third level forms, reduce the noise of whole circuit, circuit output end connects the 9th resistance R 9 of ground connection, reduce the output resistance of whole circuit, the load capacity of intensifier circuit.
Multistage amplifier circuit has multiple coupled modes, and the design adopts resistance-capacitance coupling.If number of stages of amplification too much can make its passband narrow down in addition, the progression of amplifying circuit the more, frequency band is narrower, so try not, adopt the amplifying circuit of too much progression, the utility model adopts three grades of amplifications, and this circuit adopts the degenerative mode of Voltage Series, anti-phase input, can effectively reduce the noise factor of circuit.
By reference to the accompanying drawings execution mode of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make a variety of changes.
Above embodiment only, for explanation technological thought of the present utility model, can not limit protection range of the present utility model with this.Every technological thought according to the utility model proposes, and any change of doing on technical scheme basis, within all falling into the utility model protection range.
Claims (6)
1. an amplifier, is characterized in that: comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first inductance, the second inductance, the first amplification chip, the second amplification chip and the 3rd amplification chip;
Wherein the inverting input of the first amplification chip is connected with one end of the second resistance with one end of the first resistance respectively, the positive input ground connection of the first amplification chip, the positive voltage terminal of the first amplification chip is connected respectively the first voltage and second voltage with negative voltage side, and the output of the first amplification chip connects respectively one end of the other end and the 3rd resistance of the second resistance;
The other end of the 3rd resistance connects respectively one end of inverting input and the 4th resistance of the second amplification chip;
The positive input end grounding of the second amplification chip, the positive voltage terminal of the second amplification chip is connected respectively the first voltage and second voltage with negative voltage side, and the output of the second amplification chip connects respectively one end of the other end and first inductance of the 4th resistance;
The other end of the first inductance connects respectively one end of the 7th resistance and one end of the 5th resistance;
The other end of the 7th resistance connects respectively one end of the second inductance and the normal phase input end of the 3rd amplification chip;
The inverting input of the 3rd amplification chip connects respectively one end of the 6th resistance and one end of the 8th resistance;
The other end ground connection of the 6th resistance, the output of the 3rd described amplification chip connects respectively one end of the other end and the 9th resistance of the 8th resistance;
The positive voltage terminal of described the 3rd amplification chip is connected respectively the first voltage and second voltage with negative voltage side;
The other end of described the second inductance connects respectively the other end of the 5th resistance and the other end of the 9th resistance.
2. a kind of amplifier as claimed in claim 1, is characterized in that: described the first amplification chip, the second amplification chip and the 3rd amplification chip all adopt chip LM324AD.
3. a kind of amplifier as claimed in claim 1, is characterized in that: described the first voltage is+20V direct voltage that described second voltage is-20V direct voltage.
4. a kind of amplifier as claimed in claim 1, is characterized in that: described the first electric capacity and the 5th resistance form low-pass filter circuit.
5. a kind of amplifier as claimed in claim 1, is characterized in that: described the 7th resistance and the second inductance form high-pass filtering circuit.
6. a kind of amplifier as claimed in claim 1, is characterized in that: described the 9th resistance is as load resistance, and its resistance is 1K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420336305.5U CN203933540U (en) | 2014-06-21 | 2014-06-21 | A kind of amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420336305.5U CN203933540U (en) | 2014-06-21 | 2014-06-21 | A kind of amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203933540U true CN203933540U (en) | 2014-11-05 |
Family
ID=51829292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420336305.5U Expired - Fee Related CN203933540U (en) | 2014-06-21 | 2014-06-21 | A kind of amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203933540U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506145A (en) * | 2014-12-23 | 2015-04-08 | 福建星网视易信息系统有限公司 | Low-noise small signal amplification circuit and realization method thereof |
| CN105261270A (en) * | 2015-11-26 | 2016-01-20 | 江苏海事职业技术学院 | Training-used resistance-capacitance coupled amplifier circuit |
| CN109676435A (en) * | 2019-02-15 | 2019-04-26 | 山东大学 | A kind of Milling Temperature test device, system and method |
| CN110444059A (en) * | 2019-08-01 | 2019-11-12 | 山东中医药高等专科学校 | A kind of teaching auxiliary system based on wireless network |
-
2014
- 2014-06-21 CN CN201420336305.5U patent/CN203933540U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506145A (en) * | 2014-12-23 | 2015-04-08 | 福建星网视易信息系统有限公司 | Low-noise small signal amplification circuit and realization method thereof |
| CN104506145B (en) * | 2014-12-23 | 2017-11-03 | 福建星网视易信息系统有限公司 | The small signal amplification circuit and its implementation of a kind of low noise |
| CN105261270A (en) * | 2015-11-26 | 2016-01-20 | 江苏海事职业技术学院 | Training-used resistance-capacitance coupled amplifier circuit |
| CN109676435A (en) * | 2019-02-15 | 2019-04-26 | 山东大学 | A kind of Milling Temperature test device, system and method |
| CN110444059A (en) * | 2019-08-01 | 2019-11-12 | 山东中医药高等专科学校 | A kind of teaching auxiliary system based on wireless network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150621 |
|
| EXPY | Termination of patent right or utility model |