CN205754232U - A kind of audio-frequency amplifier system of integrated digital input - Google Patents
A kind of audio-frequency amplifier system of integrated digital input Download PDFInfo
- Publication number
- CN205754232U CN205754232U CN201620615889.9U CN201620615889U CN205754232U CN 205754232 U CN205754232 U CN 205754232U CN 201620615889 U CN201620615889 U CN 201620615889U CN 205754232 U CN205754232 U CN 205754232U
- Authority
- CN
- China
- Prior art keywords
- frequency amplifier
- digital
- audio
- input
- audio frequency
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The utility model discloses the audio-frequency amplifier system of a kind of integrated digital input, including controller chip and audio frequency amplifier chip, described controller chip transmits digital signal to described audio frequency amplifier chip, and described audio frequency amplifier chip includes digital to analog converter and the audio frequency amplifier of cascade connection.Digital analog converter is integrated in boosting audio frequency amplifier chip by this utility model, makes system schema integrated level higher, and system cost is lower.
Description
Technical field
This utility model relates to the technical field of function amplifier, is related specifically to the audio frequency of a kind of integrated digital input
Amplifier system.
Background technology
Audio frequency amplifier has had the history in a soon century, first application of discharge-tube amplifier the earliest
It it is exactly audio frequency amplifier.And along with science and technology and the development of intelligent electronic product, the technology of audio frequency amplifier also exists
It is continuously updated, develops, advances, its application scenario being widely used in needing voice output, such as Baffle Box of Bluetooth, transmitter receiver
Deng.
Audio frequency amplifier is that a kind of power being amplified to low-power audio signal be suitable for driving the level of speaker is put
Big device.Audio frequency amplifier is play in the final stage of chain for audio frequency, to amplify the audio signal for playing on a speaker, described
Speaker can be the speaker in earphone or mobile device.Audio signal is regular with voice, music and audio
The frequency of sound wave, amplitude of variation information carrier.According to the feature of sound wave, audio-frequency information can be categorized as rule audio frequency with irregular
Sound.Wherein rule audio frequency can be divided into again voice, music and audio.Rule audio frequency is a kind of continuously varying analog signal,
Can represent with a continuous print curve, referred to as sound wave.But along with the process of electronic and intelligentized type, controller (MCU) also tends to number
Word is applied, and generates numeric field audio signal from digital application.But owing to prior art sound intermediate frequency amplifier is the most all configured to
Simulation input interface, so numeric field audio signal many employings digital analog converter (DAC) is converted to analog domain audio signal,
And connect the output of conventional audio amplifier by analog interface, and controller (MCU), digital analog converter (DAC), audio frequency are put
Big device, in addition to needs arrange input/output interface, is also required for independent power supply circuits.But electronic product is along with level of consumption
Be incremented by, people have higher requirement to electronic product, need electronics function get more and more, volume is but more and more less.
Thus need the design of audio-frequency amplifier system is had higher requirement, while meeting functionalization, need more to simplify
Design.And above-mentioned design obviously can not meet the demand of existing people.
Utility model content
The purpose of this utility model is to propose the audio-frequency amplifier system of a kind of integrated digital input, digital simulation is turned
Parallel operation is integrated in boosting audio frequency amplifier chip, makes system schema integrated level higher, and system cost is lower.
To this end, this utility model is by the following technical solutions:
A kind of audio-frequency amplifier system of integrated digital input, including controller chip and audio frequency amplifier chip, described
Controller chip transmits digital signal to described audio frequency amplifier chip, and described audio frequency amplifier chip includes the number that cascade connects
Weighted-voltage D/A converter and audio frequency amplifier.
Preferably, described digital to analog converter is weighted resistance network digital to analog converter, comprising: reference power supply, by multiple power
Multiple analog switches and summation that the weighted resistance network that resistor coupled in parallel connection is formed mates with the number of described weighted resistor are put
Big device, wherein, one end of each described weighted resistor by corresponding described analog switch be connected to described reference power supply, another
End is connected to the input of described summing amplifier, and each described analog switch is respectively by each Digital sum control of described digital signal
System.
Specifically, to include that operational amplifier and feedback resistance, described feedback resistance are connected to described for described summing amplifier
Between outfan and the inverting input of operational amplifier, the positive input end grounding of described operational amplifier, inverting input
It is connected with the described other end of each described weighted resistor.
This utility model uses above technical scheme, and digital analog converter is integrated into boosting audio frequency amplifier chip
In, directly using internal cabling, and make system schema integrated level higher without being picked out by chip package pin, system cost is more
Low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the audio-frequency amplifier system of integrated digital of the present utility model input；
Fig. 2 is that the circuit structure of the digital to analog converter of the audio frequency amplifier chip of integrated digital of the present utility model input shows
It is intended to；
Fig. 3 is the electrical block diagram of an embodiment of Fig. 2.
Detailed description of the invention
In order to make the purpose of this utility model, feature and advantage more clear, below in conjunction with drawings and Examples, to this
The detailed description of the invention of utility model makes more detailed description, in the following description, elaborates a lot of concrete details
So that sufficiently understanding this utility model, but this utility model can come real to be a lot different from other modes of description
Execute.Therefore, this utility model not by following discloses be embodied as limited.
The audio-frequency amplifier system of a kind of integrated digital input, as it is shown in figure 1, include that controller chip 100 and audio frequency are put
Big device chip 200, controller chip 100 transmits digital signal Dn=d to audio frequency amplifier chip 200n-1…d1d0, digital signal
Dn is the digital input signals of audio frequency amplifier chip 200.Audio frequency amplifier chip 200 includes the digital to analog converter that cascade connects
210 and audio frequency amplifier 220, wherein, the digital signal Dn of input is converted to analogue signal and is transferred to by digital to analog converter 210
Audio frequency amplifier 220, this analogue signal is amplified then exporting by audio frequency amplifier 220.
The audio-frequency amplifier system of integrated digital of the present utility model input, is integrated into digital to analog converter boosting audio frequency and puts
In big device chip, directly use internal cabling, and make system schema integrated level higher without being picked out by chip package pin, be
System cost is lower.
Preferably, the digital to analog converter 210 in the audio-frequency amplifier system of integrated digital of the present utility model input is power
Resistor network digital to analog converter.With reference to Fig. 2, weighted resistance network digital to analog converter includes: reference power supply VREF, by multiple weighted resistor
R0,R1,…,Rn-1Multiple analog switch S that number n of the weighted resistance network and weighted resistor that are connected in parallel formation is mated0,
S1,…,Sn-1, and summing amplifier.Wherein, each weighted resistor R0,R1,…,Rn-1One end opened by corresponding simulation
Close S0,S1,…,Sn-1It is connected to reference power supply VREF, each weighted resistor R0,R1,…,Rn-1The other end be connected to summing amplifier
Input.Each analog switch S0,S1,…,Sn-1Respectively by the digital input signals D of audio frequency amplifier chip 200n=
dn-1…d1d0Each Digital sum d0,d1,…,dn-1Control.
Further, as in figure 2 it is shown, summing amplifier is the operational amplifier being connected into negative feedback type, it includes computing
Amplifier and feedback resistance RF, feedback resistance RFIt is connected to the outfan V of operational amplifierOWith inverting input V-Between；Computing
The normal phase input end V of amplifier+Ground connection, inverting input V-and each weighted resistor R in weighted resistance network0,R1,…,Rn-1's
Branch road is connected.
Fig. 3 is the electrical block diagram of an embodiment of Fig. 2, and the digital to analog converter shown in it is 4 weighted resistor
Network digital to analog converter.Principle is illustrated below as a example by it:
As it is shown on figure 3, the weighted resistor networking of the digital to analog converter in audio frequency amplifier chip include 4 be connected in parallel
Road, wherein the weighted resistor R in each branch road0,R1,…,Rn-1Resistance press the proportional arrangement of 8:4:2:1, i.e. R successively0=8R, R1
=4R, R2=2R, R3=R.
Each analog switch S0,S1,S2,S3On off state respectively by 4 bit digital input signals of audio frequency amplifier chip
D4Each Digital sum d0,d1,d2,d3Control, work as D4Certain diOn the value of binary number when being 1, i.e. diWhen=1, diCorresponding
Analog switch SiGuan Bi so that with this analog switch SiCorresponding weighted resistor RiIt is switched to reference power source VREFOn, now have and prop up
Road electric current IiFlow to summing amplifier.And D4Certain diWhen=0, analog switch SiThe corresponding branch road in weighted resistance network breaks
Open, now the electric current I of this branch roadiIt is zero.
According to " virtual earth " principle of amplifier, there is V-≈V+=0.Therefore, as analog switch S0,S1,S2,S3During Guan Bi, flow through
The electric current of each branch road of weighted resistance network is V respectivelyREF/8R、VREF/4R、VREF/ 2R and VREF/R.And these each branch roads
Whether electric current exists, and depends on the closure state of analog switch in each branch road, and the closure state of each analog switch depends on
Value in each bit of the digital signal inputted.
Due to VO/RF=I0+I1+I2+I3, therefore, the output voltage V of operational amplifierOFor: VO=(d0/8R+d1/4R+d2/
2R+d3/R)×VREF×RF.Based on d0,d1,d2,d3It is the digital signal D of input4Binary corresponding positions, its value is respectively
It is 0 or 1.From above formula, work as D4=d3d2d1d0In the range of 0000-1111 during change, the output voltage V of operational amplifierO
Change the most therewith.So, the change of digital quantity has been converted to the change of voltage (analog quantity).
So using above technical scheme, digital analog converter is integrated in boosting audio frequency amplifier chip, directly
Use internal cabling, it is not necessary to separately installed digital analog converter is also picked out by chip package pin, and only need an electricity
Source powers, and makes system schema integrated level higher, and system cost is lower.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (3)
1. the audio-frequency amplifier system of an integrated digital input, it is characterised in that include controller chip and audio frequency amplifier
Chip, described controller chip transmits digital signal to described audio frequency amplifier chip, and described audio frequency amplifier chip includes level
The digital to analog converter of connection connection and audio frequency amplifier.
The audio-frequency amplifier system of a kind of integrated digital the most according to claim 1 input, it is characterised in that described digital-to-analogue
Transducer is weighted resistance network digital to analog converter, comprising: reference power supply, be connected in parallel the weighted resistor formed by multiple weighted resistor
Multiple analog switches that network mates with the number of described weighted resistor and summing amplifier, wherein, each described weighted resistor
One end is connected to described reference power supply by corresponding described analog switch, the other end is connected to described summing amplifier
Input, each described analog switch is controlled by each Digital sum of described digital signal respectively.
The audio-frequency amplifier system of a kind of integrated digital the most according to claim 2 input, it is characterised in that described summation
Amplifier includes that operational amplifier and feedback resistance, described feedback resistance are connected to the outfan of described operational amplifier and anti-phase
Between input, the positive input end grounding of described operational amplifier, inverting input and each described weighted resistor described another
End connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620615889.9U CN205754232U (en) | 2016-06-21 | 2016-06-21 | A kind of audio-frequency amplifier system of integrated digital input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620615889.9U CN205754232U (en) | 2016-06-21 | 2016-06-21 | A kind of audio-frequency amplifier system of integrated digital input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205754232U true CN205754232U (en) | 2016-11-30 |
Family
ID=57383198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620615889.9U Active CN205754232U (en) | 2016-06-21 | 2016-06-21 | A kind of audio-frequency amplifier system of integrated digital input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205754232U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110522998A (en) * | 2019-09-07 | 2019-12-03 | 洛阳康贝生物工程有限公司 | It is a kind of through cranium electromagnetism therapeutic instrument for rehabilitation |
-
2016
- 2016-06-21 CN CN201620615889.9U patent/CN205754232U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110522998A (en) * | 2019-09-07 | 2019-12-03 | 洛阳康贝生物工程有限公司 | It is a kind of through cranium electromagnetism therapeutic instrument for rehabilitation |
| CN110522998B (en) * | 2019-09-07 | 2023-03-31 | 洛阳康贝生物工程有限公司 | Transcranial electromagnetic rehabilitation therapeutic apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2019198086A (en) | Switchable secondary playback path | |
| CN106416058B (en) | For detecting the system and method for being coupled to the load impedance of transducer device of audio frequency apparatus | |
| CN103329431B (en) | Use the audio frequency amplifier of many level pulse width modulation | |
| CN106685372B (en) | Digital control power amplifier and digital control Power Amplifier Unit | |
| CN107623495A (en) | Low noise circuit | |
| CN103688467A (en) | Digital-to-analog converter circuitry with weighted resistance elements | |
| CN106575950A (en) | An audio switching amplifier | |
| CN102299688A (en) | Audio power amplifier and method for switching audio power amplifying modes | |
| CN107426125A (en) | Envelope detector based on fast current | |
| CN103222189A (en) | Hearing aid with an H-bridge output stage and a method of driving an output stage | |
| CN105247436B (en) | Voltage regulator with feedforward and feedback control | |
| CN205754232U (en) | A kind of audio-frequency amplifier system of integrated digital input | |
| CN103152670B (en) | Audio frequency processing circuit and earphone | |
| CN103633952B (en) | switching mode amplifier operation | |
| CN207200933U (en) | The audio frequency processing circuit and Baffle Box of Bluetooth of Baffle Box of Bluetooth | |
| CN204709807U (en) | A kind of intelligent toy | |
| CN103825567B (en) | Operation amplifier circuit | |
| CN205230328U (en) | Directly pour into wave form signal source of power line into | |
| CN202798586U (en) | Class B push-pull amplifying circuit | |
| CN103731109B (en) | Operational amplifier assembly and method for strengthening drive capacity of operational amplifier circuit | |
| CN206804043U (en) | Recording instrument without paper with multi-channel sampling | |
| TWI249284B (en) | Linear multiplier circuit | |
| CN203118488U (en) | Audio input and output circuit | |
| CN203167244U (en) | Audio processing circuit and earphone | |
| CN204425625U (en) | The In-Ear active noise reduction music earphone of low-power consumption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 201306 building C, No. 888, Huanhu West 2nd Road, Lingang New Area, Pudong New Area, Shanghai Patentee after: Shanghai Fourier Semiconductor Co.,Ltd. Address before: Room 706, Building 32, No. 680, Guiping Road, Xuhui District, Shanghai, 200233 Patentee before: Xiamen Fuliye Electric Co.,Ltd. |