CN203057078U - Amplifying circuit with filtering function - Google Patents
Amplifying circuit with filtering function Download PDFInfo
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- CN203057078U CN203057078U CN 201220664244 CN201220664244U CN203057078U CN 203057078 U CN203057078 U CN 203057078U CN 201220664244 CN201220664244 CN 201220664244 CN 201220664244 U CN201220664244 U CN 201220664244U CN 203057078 U CN203057078 U CN 203057078U
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- jfet
- capacitor
- amplifying circuit
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Abstract
The utility model discloses an amplifying circuit with a filtering function, and belongs to the circuit field. The amplifying circuit with the filtering function comprises a common source and base series circuit composed of a JFET common source circuit serving as a first stage and a BJT current follower serving as a second stage, wherein the JFET common source circuit is connected with a filter circuit. With the abovementioned arrangement, defects of strong interference signals, high noise and major harmonic waves of amplified voltage are overcome; and with arrangement of the filter circuit before the amplifying circuit, the problems of major harmonic waves, high noise and strong interference generated by the amplified voltage are prevented from occurring, and costs are simultaneously saved, thereby making the amplifying circuit suitable for popularization and application.
Description
Technical field
The utility model relates to a kind of amplifying circuit, concretely, belongs to the amplifying circuit of being with filtering.
Background technology
Amplifying circuit is a kind of circuit the most ordinary in the circuit, though existing amplifying circuit is effective, the voltage disturbance signal after amplifying is strong, noise is high, harmonic wave is more.
The utility model content
The purpose of this utility model is to overcome the defective that the voltage disturbance signal is strong, noise is high, harmonic wave is more after the amplification, and the amplifying circuit of band filtering is provided.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The amplifying circuit of band filtering comprises common source-cobasis sequential circuit of being made up of as the second level as the first order and BJT current follower JFET common source circuit, wherein also is connected with operational amplification circuit on the JFET common source circuit.
Further, the common base of described BJT links to each other with the drain electrode of JFET.
Simultaneously, the grid of described JFET links to each other with filter circuit, and wherein filter circuit comprises the capacitor C 2 of series connection successively, resistance R 2 and capacitor C 1, be loaded with power supply VS on the series arm of being made up of above-mentioned three, wherein JFET is connected with the end that capacitor C 2 and resistance R link to each other by capacitor C b1.
Further, be connected with between the common collector of described BJT and the power supply VCC and be connected with capacitor C b parallel with one another and resistance R b2 on resistance R c, the common emitter, wherein Bing Lian other end ground connection also is connected with resistance R b1 between this common emitter and the power supply VCC.
Further again, an end that also connects resistance R g on the grid of described JFET, the other end ground connection of resistance R g, also be connected with capacitor C b1 between this grid and the DC power supply RS, also be connected with an end of resistance R 2 on the source electrode of described JFET, the other end of resistance R 2 is connected with resistance R 1, and resistance R 1 is also in parallel with capacitor C, the above-mentioned parallel branch other end ground connection that both constitute.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model circuit structure is simple, with low cost, solves the low excessively defective of input voltage, is fit to promote the use of.
(2) the utility model adopts the configuration of BJT and JFET to cooperate, because the paraphase voltage amplifier circuit that JFET constitutes has the high and high characteristics of output resistance of voltage gain, adopt the BJT current follower can reach good amplification in the second level, upper limiting frequency can＞1MHz, and can eliminate Miller effect, intercept noise well.
(3) the utility model can just carry out filtering by a filter circuit is set at power output end before carrying out voltage amplification, prevent that voltage harmonic after the amplification is more, noise is many, disturb strong problem, simultaneously with carry out voltage amplification after again filtering compare, filtering can reduce the electronic devices and components that adopt before point presses greatly, obviously can save cost.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model-embodiment.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, the amplifying circuit of band filtering comprises common source-cobasis sequential circuit of being made up of as the second level as the first order and BJT current follower JFET common source circuit, wherein also is connected with filter circuit on the JFET common source circuit.
Be connected with capacitor C b1 between the grid of described filtering and JFET, filter circuit comprises the capacitor C 2 of series connection successively, resistance R 2 and capacitor C 1 are loaded with power supply VS on the series arm of being made up of above-mentioned three, and wherein JFET is connected with the end that capacitor C 2 and resistance R link to each other by capacitor C b1.。
The common base of described BJT links to each other with the drain electrode of JFET.Be connected with between the common collector of described BJT and the power supply VCC and be connected with capacitor C b parallel with one another and resistance R b2 on resistance R c, the common emitter, Bing Lian other end ground connection wherein, common collector also is connected with resistance R b1 by capacitor C b2 output dc voltage V0 between this common emitter and the power supply VCC.Power supply VCC=20V wherein, resistance R c=20k Ω, resistance R b1=47k Ω, resistance R b2=47k Ω, capacitor C b=47 uF, capacitor C b2=10 uF, the T2 among the BJT selects 3DG4 for use.
In order to realize the utility model better, an end that also connects resistance R g on the grid of described JFET, the other end ground connection of resistance R g, also be connected with capacitor C b1 between this grid and the DC power supply RS, also be connected with an end of resistance R 2 on the source electrode of described JFET, the other end of resistance R 2 is connected with resistance R 1, and resistance R 1 is also in parallel with capacitor C, the above-mentioned parallel branch other end ground connection that both constitute.Resistance R 1=4.7 K ω wherein, resistance R 2=100 Ω, capacitor C b1=0.47 uF, capacitor C=47 uF, the T1 among the JFET selects CS146 for use.
According to above-described embodiment, just can realize the utility model well.
Claims (5)
1. the amplifying circuit of band filtering is characterized in that, comprises common source-cobasis sequential circuit of being made up of as the second level as the first order and BJT current follower JFET common source circuit, wherein also is connected with filter circuit on the JFET.
2. the amplifying circuit of band filtering according to claim 1 is characterized in that, the common base of described BJT links to each other with the drain electrode of JFET.
3. the amplifying circuit of band filtering according to claim 2, it is characterized in that, the grid of described JFET links to each other with filter circuit, wherein filter circuit comprises the capacitor C 2 of series connection successively, resistance R 2 and capacitor C 1, be loaded with power supply VS on the series arm of being made up of above-mentioned three, wherein JFET is connected with the end that capacitor C 2 and resistance R link to each other by capacitor C b1.
4. the amplifying circuit of band filtering according to claim 3, it is characterized in that, be connected with between the common collector of described BJT and the power supply VCC and be connected with capacitor C b parallel with one another and resistance R b2 on resistance R c, the common emitter, wherein Bing Lian other end ground connection also is connected with resistance R b1 between this common emitter and the power supply VCC.
5. the amplifying circuit of band filtering according to claim 4, it is characterized in that, an end that also connects resistance R g on the grid of described JFET, the other end ground connection of resistance R g, also be connected with capacitor C b1 between this grid and the DC power supply RS, also be connected with an end of resistance R 2 on the source electrode of described JFET, the other end of resistance R 2 is connected with resistance R 1, resistance R 1 is also in parallel with capacitor C, the above-mentioned parallel branch other end ground connection that both constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664244 CN203057078U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with filtering function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664244 CN203057078U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with filtering function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057078U true CN203057078U (en) | 2013-07-10 |
Family
ID=48739994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220664244 Expired - Fee Related CN203057078U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with filtering function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057078U (en) |
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2012
- 2012-12-06 CN CN 201220664244 patent/CN203057078U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN HUAMAI TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SICHUAN GAOSOFT SOFTWARE SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20140929 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 610000 CHENGDU, SICHUAN PROVINCE TO: 518042 SHENZHEN, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140929 Address after: 518042 Guangdong city of Shenzhen province Futian District Che Kung Temple Cheonan Digital City Tienhsiang building 6C2-1 Patentee after: Shenzhen Huamai Technology Co. Ltd. Address before: 610000, No. five, No. 28, Wu Xing Road, Chengdu, Sichuan, Wuhou District Patentee before: Sichuan Gaosoft Software Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20151206 |
|
| EXPY | Termination of patent right or utility model |