CN203057076U - Amplifying circuit with high upper limiting frequency - Google Patents
Amplifying circuit with high upper limiting frequency Download PDFInfo
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- CN203057076U CN203057076U CN 201220664173 CN201220664173U CN203057076U CN 203057076 U CN203057076 U CN 203057076U CN 201220664173 CN201220664173 CN 201220664173 CN 201220664173 U CN201220664173 U CN 201220664173U CN 203057076 U CN203057076 U CN 203057076U
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- upper limiting
- limiting frequency
- amplifying circuit
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Abstract
The utility model discloses an amplifying circuit with a high upper limiting frequency, and belongs to the circuit field. The amplifying circuit with the high upper limiting frequency 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. With the abovementioned arrangement, defects of high noise and low upper limiting frequency of conventional amplifying circuits are overcome; and the amplifying circuit with the high upper limiting frequency is simple in structure and high in precision, the upper limiting frequency can be higher than 1 MHz, the Miller effect can be removed, and noise can be effectively separated, 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 a kind of amplifying circuit of high upper limiting frequency.
Background technology
Amplifying circuit is a kind of circuit the most ordinary in the circuit, though existing amplifying circuit is effective, noise height, the frequency of reaching the standard grade are low, cause range of application narrow, and can only be applied in the less demanding system, the amplifying circuit that therefore designs a kind of high upper limiting frequency is necessary.
The utility model content
The purpose of this utility model is to overcome existing amplifying circuit noise height, defective that the frequency of reaching the standard grade is low, and a kind of amplifying circuit of high upper limiting frequency is provided.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of amplifying circuit of high upper limiting frequency 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.
Further, the cobasis collection of described BJT links to each other with the drain electrode of JFET.
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, 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, has overcome the defective of available technology adopting complicated circuit, 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.
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, a kind of amplifying circuit of high upper limiting frequency 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.The cobasis collection 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 (4)
1. the amplifying circuit of a high upper limiting frequency 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.
2. the amplifying circuit of a kind of high upper limiting frequency according to claim 1 is characterized in that, the cobasis collection of described BJT links to each other with the drain electrode of JFET.
3. the amplifying circuit of a kind of high upper limiting frequency according to claim 2, 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.
4. the amplifying circuit of a kind of high upper limiting frequency according to claim 3, 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 201220664173 CN203057076U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with high upper limiting frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664173 CN203057076U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with high upper limiting frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057076U true CN203057076U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220664173 Expired - Fee Related CN203057076U (en) | 2012-12-06 | 2012-12-06 | Amplifying circuit with high upper limiting frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057076U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457544A (en) * | 2013-09-10 | 2013-12-18 | 昆山奥德鲁自动化技术有限公司 | Low-noise amplification circuit |
| CN103475317A (en) * | 2013-09-10 | 2013-12-25 | 昆山奥德鲁自动化技术有限公司 | Negative feedback amplifying circuit |
| CN112802841A (en) * | 2021-04-08 | 2021-05-14 | 成都蓉矽半导体有限公司 | Power MOSFET with Miller clamping function |
-
2012
- 2012-12-06 CN CN 201220664173 patent/CN203057076U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457544A (en) * | 2013-09-10 | 2013-12-18 | 昆山奥德鲁自动化技术有限公司 | Low-noise amplification circuit |
| CN103475317A (en) * | 2013-09-10 | 2013-12-25 | 昆山奥德鲁自动化技术有限公司 | Negative feedback amplifying circuit |
| CN112802841A (en) * | 2021-04-08 | 2021-05-14 | 成都蓉矽半导体有限公司 | Power MOSFET with Miller clamping function |
| CN112802841B (en) * | 2021-04-08 | 2021-07-09 | 成都蓉矽半导体有限公司 | Power MOSFET with Miller clamping function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20131206 |