CN2534732Y - Inverted Darlington audio frequency amplifier with stable bias current - Google Patents
Inverted Darlington audio frequency amplifier with stable bias current Download PDFInfo
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- CN2534732Y CN2534732Y CN 02222227 CN02222227U CN2534732Y CN 2534732 Y CN2534732 Y CN 2534732Y CN 02222227 CN02222227 CN 02222227 CN 02222227 U CN02222227 U CN 02222227U CN 2534732 Y CN2534732 Y CN 2534732Y
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- power amplifier
- triode
- darlington
- audio frequency
- emitter
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Abstract
A bias current-stabilizing inverted Darlington audio frequency power amplifier comprises an inverted Darlington audio frequency power amplifier. The power amplifier is characterized in that a bias current-stabilizing circuit, which consists of a low-pass filter and a reverse amplifier, is arranged between a collector and an emitter of either front pushing tube in the inverted Darlington audio frequency power amplifier. The power amplifier not only keeps the advantage of good tonal quality of the inverted Darlington audio frequency power amplifier, but also settles the problem that the static current is greatly changed after the inverted Darlington audio frequency power amplifier is started, and the best bias point is unstable when the utility power and the environment temperature fluctuate. The power amplifier can reach the stable working state after started, and the power consumption is not large. When the utility power and the environment temperature fluctuate, the fluctuation scope of the static current is stabilized within 10 percent, so no crossover distortion is caused. The power amplifier is characterized with the simple structure, the low implementation cost, the good implementation effect, and the good performance and price ratio, and can be used as the last-stage power amplifier of various audio frequency power amplification devices.
Description
The utility model relates to the structure of a kind of structure of power amplifier, particularly a kind of audio power amplifier.
Being inverted Darlington audio power amplifier utensil has the good characteristics of tonequality, and particularly middle and high frequency tonequality is that general homophase Darlington audio power amplifier device can't be compared.This is because being inverted the final stage of Darlington audio power amplifier device is that cascode or leak is altogether exported, and load has only several ohm, so " Early effect " is minimum, the middle and high voice modulation distortion that is caused by " Early effect " also reduces greatly.Simultaneously because load resistance has also improved cascode effectively very for a short time, has missed the linearity of method altogether.Be inverted Darlington audio power amplifier device in addition and also have the loop negative feedback, make output impedance just equal load impedance, this also is a good major reason of its tonequality for impedance matching.But be inverted Darlington audio power amplifier device the shortcoming that is difficult to overcome is also arranged.Because being inverted Darlington audio power amplifier device all is cascode or common leakage (field effect transistor) connection, the voltage amplification ability is all arranged, therefore all exist the problem of just bias point, promptly will make best ac load line and Q point, these are different with common homophase Darlington audio power amplifier device.Moreover when just having started shooting cold conditions, guarantee not have intermodulation distortion, quiescent current needs about 50 to 60mA; But after work a period of time, quiescent current can rise to more than the 100mA, and power consumption increases a lot.If the power consumption when making operate as normal is little, then quiescent current must be very little during cold conditions, can make like this in the start back a very long time and producing intermodulation distortion, allows the user be difficult to accept.Work as civil power in addition and rise, or the ambient temperature rising can cause that all quiescent current rises, the power consumption increasing; Otherwise civil power descends or ambient temperature decline can make quiescent current descend, and causes intermodulation distortion.So practical value is little, the product that Darlington audio power amplifier device is made final stage power amplifier is inverted in also rare use on the market.Because use inversion Darlington audio power amplifier device to make final stage power amplifier, too high to using environment requirement, it is too many to make the production cost increase.
The purpose of this utility model is: provide a kind of bias current stable inversion Darlington audio power amplifier device, it can make the quiescent current after the start stable, and when civil power and environmental temperature fluctuation, can reduce the skew of just bias point, make it can not cause intermodulation distortion.
The utility model is achieved in that the inversion Darlington audio power amplifier device that bias current is stable, and its formation comprises that is inverted a Darlington audio power amplifier device; It is characterized in that: be respectively equipped with the bias stabilization circuit that constitutes by low pass filter and sign-changing amplifier between the collector electrode of two preposition promotion pipes in being inverted Darlington audio power amplifier device and the emitter.
In the stable inversion Darlington audio power amplifier device of above-mentioned bias current, it is characterized in that: bias stabilization circuit by NPN triode BG6, collector resistance R17, base resistance R12, be connected on the PNP triode BG5 of base stage, and be connected on triode BG5 base stage by resistance R 9, R10, R11, the low pass filter that capacitor C 1, C2, C3 are formed constitutes; The emitter of triode BG6 joins with the emitter of the preposition promotion pipe NPN triode BG1 that is inverted the Darlington power amplifier, the base stage of triode BG5 is joined through the collector electrode of low pass filter and triode BG1, and the emitter of triode BG5 and resistance R 17 are joined with positive supply; Another bias stabilization circuit by PNP triode BG8, collector resistance R18, base resistance R16, be connected on the NPN triode BG7 of base stage, and be connected on triode BG7 base stage by resistance R 13, R14, R15, the low pass filter that capacitor C 4, C5, C6 are formed constitutes; The emitter of triode BG8 joins with the emitter of the preposition promotion pipe PNP triode BG3 that is inverted the Darlington power amplifier, the base stage of triode BG7 is joined through the collector electrode of low pass filter and triode BG3, and the emitter of triode BG7 and resistance R 18 are joined with negative supply.
Compared with the prior art, the utility model has been set up the bias stabilization circuit that is made of low pass filter and sign-changing amplifier in being inverted Darlington audio power amplifier device.Both kept and be inverted the good advantage of Darlington audio power amplifier device tonequality; It is big to have solved inversion Darlington audio power amplifier device start back quiescent current variation again, when civil power and environmental temperature fluctuation, and just bias point problem of unstable.The utility model can reach steady-working state rapidly after start, and power consumption is little; When civil power and environmental temperature fluctuation, can make the fluctuation of quiescent current be stabilized in scope less than 10%, make it not cause intermodulation distortion.Have simple in structurely, implementation cost is low, and implementation result is good, the characteristics that the ratio of performance to price is good.The final stage power amplifier device that can be used as various audio power amplifier devices uses.
Below in conjunction with accompanying drawing embodiment of the present utility model is further described.
Accompanying drawing 1 is an electrical block diagram of being inverted Darlington audio power amplifier device;
Accompanying drawing 2 is electrical block diagrams of the stable inversion Darlington audio power amplifier device of bias current.
Embodiment: the inversion Darlington audio power amplifier device that bias current is stable, its formation comprises an inversion Darlington audio power amplifier device shown in the accompanying drawing 1, has increased the bias stabilization circuit that is made of low pass filter and compound sign-changing amplifier in being inverted Darlington audio power amplifier device; Bias stabilization circuit by NPN triode BG6, collector resistance R17, base resistance R12, be connected on the PNP triode BG5 of base stage, and be connected on triode BG5 base stage by resistance R 9, R10, R11, the low pass filter that capacitor C 1, C2, C3 are formed constitutes; The emitter of triode BG6 joins with the emitter of the preposition promotion pipe NPN triode BG1 that is inverted the Darlington power amplifier, the base stage of triode BG5 is joined through the collector electrode of low pass filter and triode BG1, and the emitter of triode BG5 and resistance R 17 are joined with positive supply; Another bias stabilization circuit by PNP triode BG8, collector resistance R18, base resistance R16, be connected on the NPN triode BG7 of base stage, and be connected on triode BG7 base stage by resistance R 13, R14, R15, the low pass filter that capacitor C 4, C5, C6 are formed constitutes; The emitter of triode BG8 joins with the emitter of the preposition promotion pipe PNP triode BG3 that is inverted the Darlington power amplifier, the base stage of triode BG7 is joined through the collector electrode of low pass filter and triode BG3, and the emitter of triode BG7 and resistance R 18 are joined with negative supply.
Operation principle: when civil power or environmental temperature fluctuation, cause the DC voltage rising (or decline) at R1 two ends, the direct voltage of this variation is amplified it by BG5, BG6 after low-pass filtering, the emitter voltage of BG1 is risen (or decline), the R1 both end voltage is descended (or rising), realize the direct current negative feedback of stablizing bias current.The variation and the intermodulation distortion of quiescent current are controlled in the scope that can bear all the time.
Claims (2)
1, the stable inversion Darlington audio power amplifier device of bias current, its formation comprise that is inverted a Darlington audio power amplifier circuit; It is characterized in that: be respectively equipped with the bias stabilization circuit that constitutes by low pass filter and sign-changing amplifier between the collector electrode of two preposition promotion pipes in being inverted Darlington audio power amplifier device and the emitter.
2, the stable inversion Darlington audio power amplifier device of bias current according to claim 1, it is characterized in that: bias stabilization circuit by NPN triode BG6, collector resistance R17, base resistance R12, be connected on the PNP triode BG5 of base stage, and be connected on triode BG5 base stage by resistance R 9, R10, R11, the low pass filter that capacitor C 1, C2, C3 are formed constitutes; The emitter of triode BG6 joins with the emitter of the preposition promotion pipe NPN triode BG1 that is inverted the Darlington power amplifier, the base stage of triode BG5 is joined through the collector electrode of low pass filter and triode BG1, and the emitter of triode BG5 and resistance R 17 are joined with positive supply; Another bias stabilization circuit by PNP triode BG8, collector resistance R18, base resistance R16, be connected on the NPN triode BG7 of base stage, and be connected on triode BG7 base stage by resistance R 13, R14, R15, the low pass filter that capacitor C 4, C5, C6 are formed constitutes; The emitter of triode BG8 joins with the emitter of the preposition promotion pipe PNP triode BG3 that is inverted the Darlington power amplifier, the base stage of triode BG7 is joined through the collector electrode of low pass filter and triode BG3, and the emitter of triode BG7 and resistance R 18 are joined with negative supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02222227 CN2534732Y (en) | 2002-04-12 | 2002-04-12 | Inverted Darlington audio frequency amplifier with stable bias current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02222227 CN2534732Y (en) | 2002-04-12 | 2002-04-12 | Inverted Darlington audio frequency amplifier with stable bias current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2534732Y true CN2534732Y (en) | 2003-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02222227 Expired - Fee Related CN2534732Y (en) | 2002-04-12 | 2002-04-12 | Inverted Darlington audio frequency amplifier with stable bias current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2534732Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855252A (en) * | 2019-11-20 | 2020-02-28 | 许昌开普检测研究院股份有限公司 | Current expansion circuit of power operational amplifier |
-
2002
- 2002-04-12 CN CN 02222227 patent/CN2534732Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855252A (en) * | 2019-11-20 | 2020-02-28 | 许昌开普检测研究院股份有限公司 | Current expansion circuit of power operational amplifier |
| CN110855252B (en) * | 2019-11-20 | 2023-07-14 | 许昌开普检测研究院股份有限公司 | Current spreading circuit of power operational amplifier |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |