CN205232176U - Low noise power amplifier based on hardware blind spot regulator circuit - Google Patents
Low noise power amplifier based on hardware blind spot regulator circuit Download PDFInfo
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- CN205232176U CN205232176U CN201520964247.5U CN201520964247U CN205232176U CN 205232176 U CN205232176 U CN 205232176U CN 201520964247 U CN201520964247 U CN 201520964247U CN 205232176 U CN205232176 U CN 205232176U
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Abstract
The utility model provides a low noise power amplifier based on hardware blind spot regulator circuit, including triangular wave generating circuit and triangular wave comparison circuit, still include blind spot circuit regulation circuit, including 86 singlechip U1, wherein, pin 1A, 2B and 4B link to each other with GND, pin 3A links to each other with VCC, pin 2A passes through electric capacity C2 and links to each other with GND to it is continuous through diode D1 and pin 1Y, and pin 2A links to each other with the anodal of diode D1, still include the resistance R6 parallelly connected with diode D1, pin 4A passes through electric capacity C3 and links to each other with GND to it is continuous through diode D2 and pin 3Y, and pin 4A links to each other with the anodal of diode D2, still include the resistance R7 parallelly connected with diode D2, pin 1B and pin 3B link to each other with triangular wave comparison circuit output respectively. This circuit utilizes the level upset threshold value of charging of rc and gate circuit to realize the delay of signal to realize two tunnel complementary square signal's blind spot time adjustment.
Description
Technical field
The utility model relates to a kind of low noise amplifier based on hardware dead zone adjusting circuit, particularly relates to a kind of low noise amplifier based on hardware dead zone adjusting circuit being applicable to discrete D-type power amplifier.
Background technology
When Dead Time is PWM output, in order to the protective time slot making the pipe up and down of H bridge or half H bridge can not arrange because conducting simultaneously occurs switching speed problem.Usually the pwm response time is also referred to.Due to IGBT(insulated gate polar form power tube) all there is certain junction capacitance, so the delay phenomenon that break-over of device turns off can be caused in constant power device.Generally reduce this impact when design circuit as far as possible, such as improve as far as possible and control pole driving voltage electric current, junction capacitance Releasing loop etc. is set.In order to make igbt reliable operation, avoid, because turn-off delay effect causes upper and lower bridge arm to lead directly to, being necessary to arrange Dead Time, namely the upper and lower bridge arm turn-off time simultaneously.The brachium pontis that Dead Time can avoid late effect to cause effectively does not turn off completely, and another brachium pontis is in conducting state, avoids straight-through fried module.Dead Time is large, and module work is more reliable, but can bring the distortion of output waveform and reduce delivery efficiency.
In the existing tone playing equipment be connected with multiple stage power amplifier, when wherein a power amplifier breaks down, the audio amplifier be connected with this power amplifier just can not release sound, causes the region that amplifies at this audio amplifier place normally not amplify, the playback effect that impact is overall.
D-type power amplifier conventional at present adopts the same phase structure of fully differential mostly, that is, comprise integrator, comparator, driver-level, output stage, triangular-wave generator and feedback network etc.Integrator usually adopts difference amplifier to coordinate with electric capacity and realizes, input analog signal is input to integrator input with output pulse feedback signal simultaneously, integrator exports the contrary year input signal and the sawtooth signal changed of two phase places, these two signals are added to the input of two comparators, and the triangular wave produced with triangular-wave generator compares input pulse signal; This pulse signal strengthens after driving force through driving stage, is sent to output stage and carries out power amplification output, and the signal that output stage exports feeds back to integrator input through feedback network and arranges gain.
The linearization technique of current power amplifier can be divided into four kinds: Power back, feedback transmitter, pre-distortion method and feed forward approach.Power back is the method the most simply improving power amplifier linearity, but its essence is that sacrifice DC power is to improve the linearity, and this makes the efficiency of power amplifier greatly reduce, and effective power is only 1%-5%.Feedback transmitter is that a part for the nonlinear distortion signal cancellation amplifier self utilizing amplifier to export is non-linear, and shortcoming is reduction of the gain of amplifier, offsets degree not high, and brings the stability problem of whole power amplifier work.Pre-distortion method is exactly increase non-linear in order to compensated amplifier work of a nonlinear circuit before power amplifier.Pre-distortion technology is divided into radio frequency distortion and Digital base-band pre-distortion two kinds of fundamental types.Shortcoming is that the improvement of spectral re-growth component is less, and high order frequency spectrum component cancellation is more difficult.
Utility model content
It is strong that the technical problems to be solved in the utility model is to provide a kind of noise resisting ability, and the distortion factor is low, based on the discrete D class low noise amplifier of hardware dead zone adjusting circuit.
The technical solution adopted in the utility model is as follows: a kind of low noise amplifier based on hardware dead zone adjusting circuit, comprises triangle wave generating circuit and triangle wave circuit; It is characterized in that: also comprise dead-zone circuit Circuit tuning, comprise 86 single-chip microcomputer U1, wherein, pin one A, 2B are connected with 4B and GND; Pin 3A and VCC is connected; Pin two A is connected by electric capacity C2 and GND, and is connected with pin one Y by diode D1, and pin two A is connected with the positive pole of diode D1; Also comprise the resistance R6 in parallel with diode D1; Pin 4A is connected by electric capacity C3 and GND, and is connected with pin 3Y by diode D2, and pin 4A is connected with the positive pole of diode D2; Also comprise the resistance R7 in parallel with diode D2; Pin one B is connected with triangle wave circuit output end respectively with pin 3B.
This circuit utilizes the charging of rc, and the level turn threshold of gate circuit realizes the delay of signal, thus realizes the Dead Time adjustment of the complementary square-wave signal of two-way.
As preferably, described triangle wave circuit comprises triangle wave device, and negative input is connected with triangular-wave generator output, and electrode input end is connected with power amplifier input signal end.
As preferably, described triangle wave device electrode input end is connected with its output by resistance R2.
Add retarding window in circuit, improve the ability of anti-noise jamming.
As preferably, described power amplifier input signal end is connected with triangle wave device electrode input end by resistance R3.
As preferably, described triangle wave generating circuit comprises thresholding comparison module and linear charge-discharge modules; Described thresholding comparison module comprises comparator thresholding comparison module; The negative input input reference voltage of described comparator, electrode input end and output connecting linear charge-discharge modules.
The quality of the triangular wave linearity weighs the pith of whole system quality, because triangular wave part below also can introduce larger distortion, if this part triangular wave linearity produced is not enough good, so can bring very large distortion.
Have employed a slice amplifier and a slice comparator and form triangle wave generating circuit, we can see that OPA365 is responsible for linear discharge and recharge, and TLV3501 is above responsible for thresholding and compares, thus produce the high triangular wave of the linearity.
As preferably, described linear charge-discharge modules is the linear charge-discharge modules of operational amplifier; The negative input of described operational amplifier is connected with the output of described comparator, and is connected with the electrode input end of comparator by resistance R1; The electrode input end of described operational amplifier is connected with reference voltage.
As preferably, the negative input of described comparator is connected with the output of operational amplifier by potentiometer RP.
As preferably, the negative input of described comparator is connected with the electrode input end of operational amplifier by potentiometer RP.
Compared with prior art, the beneficial effects of the utility model are:
1, utilize the charging of rc, and the level turn threshold of gate circuit realizes the delay of signal, thus realize the Dead Time adjustment of the complementary square-wave signal of two-way.
2, in triangle wave circuit, add retarding window, improve the ability of anti-noise jamming;
3, have employed a slice amplifier and a slice comparator formation triangle wave generating circuit, thus produce the high triangular wave of the linearity.
Accompanying drawing explanation
Fig. 1 is the input signal amplifying circuit schematic diagram of the utility model wherein embodiment;
Fig. 2 is the principle schematic of the utility model triangle wave circuit wherein embodiment.
Fig. 3 is the principle schematic of the utility model triangle wave generating circuit wherein embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Arbitrary feature disclosed in this specification (comprise summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Specific embodiment one
As shown in Figure 1, a kind of low noise amplifier based on hardware dead zone adjusting circuit, comprises triangle wave generating circuit and triangle wave circuit; Also comprise dead-zone circuit Circuit tuning, comprise 86 single-chip microcomputer U1, wherein, pin one A, 2B are connected with 4B and GND; Pin 3A and VCC is connected; Pin two A is connected by electric capacity C2 and GND, and is connected with pin one Y by diode D1, and pin two A is connected with the positive pole of diode D1; Also comprise the resistance R6 in parallel with diode D1; Pin 4A is connected by electric capacity C3 and GND, and is connected with pin 3Y by diode D2, and pin 4A is connected with the positive pole of diode D2; Also comprise the resistance R7 in parallel with diode D2; Pin one B is connected with triangle wave circuit output end respectively with pin 3B.
This circuit utilizes the charging of rc, and the level turn threshold of gate circuit realizes the delay of signal, thus realizes the Dead Time adjustment of the complementary square-wave signal of two-way.
Specific embodiment two
On the basis of specific embodiment one, as shown in Figure 2, described triangle wave circuit comprises triangle wave device, and negative input is connected with triangular-wave generator output, and electrode input end is connected with power amplifier input signal end.
Specific embodiment three
On the basis of specific embodiment two, described triangle wave device electrode input end is connected with its output by resistance R2.
Add retarding window in circuit, improve the ability of anti-noise jamming.
At specific embodiment four
On the basis of specific embodiment three, described power amplifier input signal end is connected with triangle wave device electrode input end by resistance R3.
At specific embodiment five
On the basis of one of specific embodiment one to four, as shown in Figure 3, described triangle wave generating circuit comprises thresholding comparison module and linear charge-discharge modules; Described thresholding comparison module comprises comparator thresholding comparison module; The negative input input reference voltage of described comparator, electrode input end and output connecting linear charge-discharge modules.
The quality of the triangular wave linearity weighs the pith of whole system quality, because triangular wave part below also can introduce larger distortion, if this part triangular wave linearity produced is not enough good, so can bring very large distortion.
Have employed a slice amplifier and a slice comparator and form triangle wave generating circuit, we can see that OPA365 is responsible for linear discharge and recharge, and TLV3501 is above responsible for thresholding and compares, thus produce the high triangular wave of the linearity.
At specific embodiment six
On the basis of specific embodiment five, described linear charge-discharge modules is the linear charge-discharge modules of operational amplifier; The negative input of described operational amplifier is connected with the output of described comparator, and is connected with the electrode input end of comparator by resistance R1; The electrode input end of described operational amplifier is connected with reference voltage.
At specific embodiment seven
On the basis of specific embodiment six, the negative input of described comparator is connected with the output of operational amplifier by potentiometer RP.
At specific embodiment eight
On the basis of specific embodiment seven, the negative input of described comparator is connected with the electrode input end of operational amplifier by potentiometer RP.
Claims (8)
1., based on a low noise amplifier for hardware dead zone adjusting circuit, comprise triangle wave generating circuit and triangle wave circuit; It is characterized in that: also comprise dead-zone circuit Circuit tuning, comprise 86 single-chip microcomputer U1, wherein, pin one A, 2B are connected with 4B and GND; Pin 3A and VCC is connected; Pin two A is connected by electric capacity C2 and GND, and is connected with pin one Y by diode D1, and pin two A is connected with the positive pole of diode D1; Also comprise the resistance R6 in parallel with diode D1; Pin 4A is connected by electric capacity C3 and GND, and is connected with pin 3Y by diode D2, and pin 4A is connected with the positive pole of diode D2; Also comprise the resistance R7 in parallel with diode D2; Pin one B is connected with triangle wave circuit output end respectively with pin 3B.
2. low noise amplifier according to claim 1, is characterized in that: described triangle wave circuit comprises triangle wave device, and negative input is connected with triangular-wave generator output, and electrode input end is connected with power amplifier input signal end.
3. low noise amplifier according to claim 2, is characterized in that: described triangle wave device electrode input end is connected with its output by resistance R2.
4. the low noise amplifier according to Claims 2 or 3, is characterized in that: described power amplifier input signal end is connected with triangle wave device electrode input end by resistance R3.
5. according to the low noise amplifier one of Claim 1-3 Suo Shu, it is characterized in that: described triangle wave generating circuit comprises thresholding comparison module and linear charge-discharge modules; Described thresholding comparison module comprises comparator thresholding comparison module; The negative input input reference voltage of described comparator, electrode input end and output connecting linear charge-discharge modules.
6. low noise amplifier according to claim 5, is characterized in that: described linear charge-discharge modules is the linear charge-discharge modules of operational amplifier; The negative input of described operational amplifier is connected with the output of described comparator, and is connected with the electrode input end of comparator by resistance R1; The electrode input end of described operational amplifier is connected with reference voltage.
7. low noise amplifier according to claim 6, is characterized in that: the negative input of described comparator is connected with the output of operational amplifier by potentiometer RP.
8. low noise amplifier according to claim 7, is characterized in that: the negative input of described comparator is connected with the electrode input end of operational amplifier by potentiometer RP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964247.5U CN205232176U (en) | 2015-11-30 | 2015-11-30 | Low noise power amplifier based on hardware blind spot regulator circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964247.5U CN205232176U (en) | 2015-11-30 | 2015-11-30 | Low noise power amplifier based on hardware blind spot regulator circuit |
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| Publication Number | Publication Date |
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| CN205232176U true CN205232176U (en) | 2016-05-11 |
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| CN201520964247.5U Active CN205232176U (en) | 2015-11-30 | 2015-11-30 | Low noise power amplifier based on hardware blind spot regulator circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xie Qing Inventor before: Zeng Li |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170329 Address after: 511442, Guangzhou, Panyu District, South Town, South Village, the first line of the western part of the line industrial zone, No. 16 Patentee after: Guangzhou sky-art audio Co. Ltd. Address before: 610000 Chengdu City, Wuhou District Province, the South Ring Road, No. two, No. 1, No. 1, floor 31, No. 5 Patentee before: CHENGDU DESHANNENG TECHNOLOGY CO., LTD. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181204 Address after: 511442 No. 16, west line industrial zone, Keng Tau Village, Panyu District South Village, Guangzhou, Guangdong province (self declaration) Patentee after: Tiangong (Guangzhou) audio equipment Co., Ltd. Address before: 511442 Part of No. 16 West Line Industrial Zone of Kengtou Village, Nancun Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: Guangzhou sky-art audio Co. Ltd. |
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| TR01 | Transfer of patent right |