CN203933556U - A kind of post-amplifier - Google Patents
A kind of post-amplifier Download PDFInfo
- Publication number
- CN203933556U CN203933556U CN201420333815.7U CN201420333815U CN203933556U CN 203933556 U CN203933556 U CN 203933556U CN 201420333815 U CN201420333815 U CN 201420333815U CN 203933556 U CN203933556 U CN 203933556U
- Authority
- CN
- China
- Prior art keywords
- resistance
- triode
- amplifier
- electric capacity
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a kind of post-amplifier, adopt four triodes, wherein two triodes form preamplifier state, and two other triode forms symmetrical output stage, the output signal of pre-amplifier, through the laggard line output of symmetrical complement, has been improved to the signal to noise ratio of circuit; In the first triode and the second triode, introduce negative feedback, guarantee the stability of circuit working point, simultaneously whole circuit adopts resistance as load, has guaranteed frequency characteristic and the noiseproof feature of circuit simultaneously.
Description
Technical field
The utility model discloses a kind of post-amplifier, belong to amplifier technical field.
Background technology
In RF application, the application of amplifier is very extensive, and amplifier is exactly the device of the voltage of input signal or power amplification, electron tube or transistor, power transformer and other electric elements, to consist of, be used in communication, broadcast, radar, TV, in the various devices such as automatic control.
Power amplifier is generally used for the final stage of transmitter, effect is that high frequency modulated wave signal is carried out to power amplification, to meet the requirement of transmitted power, then through antenna, be radiated space, guarantee that the receiver in certain area can receive satisfied signal level, and do not disturb the passage of the signal that is connected.
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.
Due to the easy self-excitation of wide-band amplifier ubiquity and the excessive shortcoming of output noise, this is mainly because unreasonable the causing of design of rear class amplifying circuit, even if the noise of preamplifying circuit is enough low, if but the noise of rear class amplifying circuit is excessive, gain too small, can cause equally the noise of wide-band amplifier excessive, when signal power increases, just easily there is the situation of self-excitation in wide-band amplifier, 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, a kind of post-amplifier is provided, adopt four triodes, two triodes form preamplifier state, two other triode forms symmetrical output stage, the output signal of pre-amplifier, through the laggard line output of symmetrical complement, has been improved to the signal to noise ratio of circuit; In the first triode and the second triode, introduce negative feedback, guarantee the stability of circuit working point, simultaneously whole circuit adopts resistance as load, has guaranteed frequency characteristic and the noiseproof feature of circuit simultaneously.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of post-amplifier, 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 tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first triode, the second triode, the 3rd triode, the 4th triode
Wherein one end of the first resistance connects respectively the base stage of one end of the second resistance, one end of the first electric capacity and the first triode,
The other end of described the first resistance connect respectively one end of the 3rd resistance, one end of one end of the 6th resistance, the 3rd electric capacity, one end of the 5th electric capacity,
The other end of described the second resistance connects respectively one end of the 4th resistance, the collector electrode of one end of the second electric capacity, the 3rd triode and the other end of the 5th electric capacity,
The emitter of described the 3rd triode connects one end of the 9th resistance, and the collector electrode of the 3rd triode connects positive voltage;
The other end of described the 9th resistance connects respectively one end of the 4th electric capacity, one end of the 8th resistance, the tenth one end of resistance and one end of the 11 resistance, the other end ground connection of described the 11 resistance, and the other end of described the 4th electric capacity connects one end of the 7th resistance,
The other end of described the 4th resistance and the other end of the second electric capacity are all connected the emitter of the first triode,
The collector electrode of described the first triode connects respectively one end of the 5th resistance and the base stage of the 3rd triode,
The other end of described the 5th resistance connects respectively the base stage of collector electrode and the 4th triode of the second triode,
The base stage of described the second triode with the other end of the first electric capacity, the other end of the other end of the 3rd resistance, the 7th resistance, the other end of the 8th resistance be connected,
The emitter of described the second triode is connected with the other end of the 6th resistance, the other end of the 3rd electric capacity respectively,
The collector electrode of described the second triode connects respectively the base stage of the other end and the 4th triode of the 5th resistance,
The emitter of the 4th triode connects the other end of the tenth resistance.
As further prioritization scheme of the present utility model, the first described triode and the model of the 4th triode are B649A.
As further prioritization scheme of the present utility model, the second described triode and the model of the 3rd triode are D669A.
As further prioritization scheme of the present utility model, the positive voltage of the collector electrode of described the 3rd triode is 30V.
As further prioritization scheme of the present utility model, described the first resistance is adjustable resistance.
As further prioritization scheme of the present utility model, the gain of described post-amplifier is 30dB.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
First: the utility model adopts four triodes, two triodes form preamplifier state, and two other triode forms symmetrical output stage, and the output signal of pre-amplifier, through the laggard line output of symmetrical complement, has been improved to the signal to noise ratio of circuit;
Second: the utility model is introduced negative feedback in the first triode and the second triode, the stability of assurance circuit working point;
Three, the whole circuit of the utility model adopts resistance as load, has guaranteed frequency characteristic and the noiseproof feature of circuit.
Accompanying drawing explanation
Fig. 1, electrical block 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 post-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 tenth resistance R the 10, the 11 resistance R 11, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the first triode T1, the second triode T2, the 3rd triode T3, the 4th triode T4
Wherein one end of the first resistance R 1 connects respectively the base stage of one end of the second resistance R 2, one end of the first capacitor C 1 and the first triode T1,
The other end of described the first resistance R 1 connect respectively one end of the 3rd resistance R 3, one end of one end of the 6th resistance R 6, the 3rd capacitor C 3, one end of the 5th capacitor C 5,
The other end of described the second resistance R 2 connects respectively one end of the 4th resistance R 4, the collector electrode of one end of the second capacitor C 2, the 3rd triode T3 and the other end of the 5th capacitor C 5,
The emitter of described the 3rd triode T3 connects one end of the 9th resistance R 9, and the collector electrode of the 3rd triode T3 connects positive voltage;
The other end of described the 9th resistance R 9 connects respectively one end of the 4th capacitor C 4, one end of the 8th resistance R 8, the tenth one end of resistance R 10 and one end of the 11 resistance R 11, the other end ground connection of described the 11 resistance R 11, the other end of described the 4th capacitor C 4 connects one end of the 7th resistance R 7
The other end of described the 4th resistance R 4 and the other end of the second capacitor C 2 are all connected the emitter of the first triode T1,
The collector electrode of described the first triode T1 connects respectively one end of the 5th resistance R 5 and the base stage of the 3rd triode T3,
The other end of described the 5th resistance R 5 connects respectively the collector electrode of the second triode T2 and the base stage of the 4th triode T4,
The base stage of described the second triode T2 with the other end of the first capacitor C 1, the other end of the other end of the 3rd resistance R 3, the 7th resistance R 7, the other end of the 8th resistance R 8 be connected,
The emitter of described the second triode T2 is connected with the other end of the 6th resistance R 6, the other end of the 3rd capacitor C 3 respectively,
The collector electrode of described the second triode T2 connects respectively the base stage of the other end and the 4th triode T4 of the 5th resistance R 5,
The emitter of the 4th triode T4 connects the other end of the tenth resistance R 10.
This post-amplifier is fixed gain amplifier, it is the symmetrical complement circuit of a typical single power supply, output from preamplifier during the signal of this circuit enters through the last signal output of symmetrical complement circuit, and the function of this circuit is that output voltage is amplified.
As further prioritization scheme of the present utility model, the first described triode T1 and the model of the 4th triode T4 are B649A.
As further prioritization scheme of the present utility model, the second described triode T2 and the model of the 3rd triode T3 are D669A.
That triode is selected is B649A and D669A, the first triode T1T1 and the second triode T2T2 form pre-amplification circuit, the 3rd triode T3T3 and the 4th triode T4T4 form symmetrical output circuit, do not affect again the performance parameter of signal when effectively signal being amplified.
As further prioritization scheme of the present utility model, described the first resistance R 1 is adjustable resistance.
At input signal, it is 0 o'clock, adjust the resistance of the first resistance R 1R1, for triode provides suitable biasing, thereby the current potential that makes the 7th resistance R 7R7 and the 8th resistance R 8R8 is Vcc/2, the 7th resistance R 7R7, the 8th resistance R 8R8 are connected output with the 4th capacitor C 4C4 with the first triode T1T1, the second triode T2T2 input, introduce negative feedback, increase the bandwidth of post-amplifier, in order to guarantee noise characteristic and the frequency performance of circuit, use resistance as the load of circuit simultaneously.
As further prioritization scheme of the present utility model, the positive voltage of the collector electrode of described the 3rd triode T3 is 30V.
As further prioritization scheme of the present utility model, the gain of described post-amplifier is 30dB.
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. a post-amplifier, it 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 tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first triode, the second triode, the 3rd triode, the 4th triode
Wherein one end of the first resistance connects respectively the base stage of one end of the second resistance, one end of the first electric capacity and the first triode,
The other end of described the first resistance connect respectively one end of the 3rd resistance, one end of one end of the 6th resistance, the 3rd electric capacity, one end of the 5th electric capacity,
The other end of described the second resistance connects respectively one end of the 4th resistance, the collector electrode of one end of the second electric capacity, the 3rd triode and the other end of the 5th electric capacity,
The emitter of described the 3rd triode connects one end of the 9th resistance, and the collector electrode of the 3rd triode connects positive voltage;
The other end of described the 9th resistance connects respectively one end of the 4th electric capacity, one end of the 8th resistance, the tenth one end of resistance and one end of the 11 resistance, the other end ground connection of described the 11 resistance, and the other end of described the 4th electric capacity connects one end of the 7th resistance,
The other end of described the 4th resistance and the other end of the second electric capacity are all connected the emitter of the first triode,
The collector electrode of described the first triode connects respectively one end of the 5th resistance and the base stage of the 3rd triode,
The other end of described the 5th resistance connects respectively the base stage of collector electrode and the 4th triode of the second triode,
The base stage of described the second triode with the other end of the first electric capacity, the other end of the other end of the 3rd resistance, the 7th resistance, the other end of the 8th resistance be connected,
The emitter of described the second triode is connected with the other end of the 6th resistance, the other end of the 3rd electric capacity respectively,
The collector electrode of described the second triode connects respectively the base stage of the other end and the 4th triode of the 5th resistance,
The emitter of the 4th triode connects the other end of the tenth resistance.
2. a kind of post-amplifier as claimed in claim 1, is characterized in that: the first described triode and the model of the 4th triode are B649A.
3. a kind of post-amplifier as claimed in claim 1, is characterized in that: the second described triode and the model of the 3rd triode are D669A.
4. a kind of post-amplifier as claimed in claim 1, is characterized in that: the positive voltage of the collector electrode of described the 3rd triode is 30V.
5. a kind of post-amplifier as claimed in claim 1, is characterized in that: described the first resistance is adjustable resistance.
6. a kind of post-amplifier as claimed in claim 1, is characterized in that: the gain of described post-amplifier is 30dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420333815.7U CN203933556U (en) | 2014-06-21 | 2014-06-21 | A kind of post-amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420333815.7U CN203933556U (en) | 2014-06-21 | 2014-06-21 | A kind of post-amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203933556U true CN203933556U (en) | 2014-11-05 |
Family
ID=51829308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420333815.7U Expired - Fee Related CN203933556U (en) | 2014-06-21 | 2014-06-21 | A kind of post-amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203933556U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781869A (en) * | 2020-06-10 | 2020-10-16 | 上海空间电源研究所 | High-reliability satellite power supply controller matrix instruction system and control method thereof |
-
2014
- 2014-06-21 CN CN201420333815.7U patent/CN203933556U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781869A (en) * | 2020-06-10 | 2020-10-16 | 上海空间电源研究所 | High-reliability satellite power supply controller matrix instruction system and control method thereof |
| CN111781869B (en) * | 2020-06-10 | 2021-07-09 | 上海空间电源研究所 | High-reliability satellite power supply controller matrix instruction system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101997499B (en) | AGC (Automatic Gain Control) circuit for transimpedance amplifier | |
| CN102201792A (en) | Automatic gain control circuit of audio power amplifier | |
| KR102178526B1 (en) | Power amplifier | |
| CN101826844A (en) | Power amplifier and signal amplifying method based on power amplifier | |
| CN105162422A (en) | Single-end-structure low noise amplifier | |
| CN109347513A (en) | A kind of bid and purchase information calibration circuit | |
| CN103199812A (en) | Amplifier for wireless receiver and associated method | |
| CN203734624U (en) | High-performance microstrip multistage low-noise amplifier | |
| CN103368506B (en) | wideband variable gain amplifier | |
| CN108880484B (en) | Power amplifier bias circuit | |
| CN203933540U (en) | A kind of amplifier | |
| CN203933556U (en) | A kind of post-amplifier | |
| CN107707293A (en) | Signal enhancing device for ship electronic clearance | |
| CN205596312U (en) | Microphone amplifier circuit and electronic equipment | |
| CN102882476A (en) | High-bandwidth amplifying circuit | |
| CN106026940B (en) | A kind of DC bias circuit of trans-impedance amplifier | |
| CN104660322A (en) | WIFI signal enhancement device | |
| CN101610068A (en) | The circuit of step-down amplifier noise factor | |
| CN103973241A (en) | Power amplifying circuit capable of dynamically adjusting gain | |
| CN101262258A (en) | Demodulation device for microwave signal transmitter | |
| CN103248328A (en) | Power amplifier and utilization method | |
| CN104901631A (en) | Power amplifying device | |
| CN103532572A (en) | Low-power high-sensitivity FM transmitter | |
| CN210380780U (en) | Radio frequency power amplifying circuit and radio frequency front end device | |
| CN203537321U (en) | Weak mechanical vibration wave signal processing circuit |
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 |