CN204046529U - Analog voltage signal output circuit - Google Patents
Analog voltage signal output circuit Download PDFInfo
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- CN204046529U CN204046529U CN201420402387.9U CN201420402387U CN204046529U CN 204046529 U CN204046529 U CN 204046529U CN 201420402387 U CN201420402387 U CN 201420402387U CN 204046529 U CN204046529 U CN 204046529U
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- Prior art keywords
- resistance
- operational amplifier
- negative feedback
- circuit unit
- output
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Abstract
The utility model provides a kind of analog voltage signal output circuit, it comprises first order negative feedback amplifier circuit unit and second level negative feedback amplifier circuit unit, described first order negative feedback amplifier circuit unit comprises the first operational amplifier (U1A), resistance (R1), resistance (R2) and resistance (R3), and described second level negative feedback amplifier circuit unit comprises the second operational amplifier (U1B), resistance (R4), resistance (R5), resistance (R6) and resistance (R7).Analog voltage signal output circuit of the present utility model, D/A converter conversion output voltage obtains the contrary voltage output signal of a numerical value after the process of first order negative feedback amplifier circuit unit and second level negative feedback amplifier circuit unit, so just considerably increase the scope of output voltage signal, pass through the resistance of adjusting resistance (R3) resistance (R6) and resistance (R7) simultaneously, just can obtain good linearity and the high voltage signal of precision, this circuit stability is reliable and with low cost.
Description
Technical field
The utility model relates to analog voltage signal and exports field, relate to a kind of analog voltage signal output circuit specifically.
Background technology
In the controller, often to use analog signal to control other equipment, but output voltage range is wide, good linearity and the high voltage signal of precision are difficult to realize by common integrated chip, how to design can realize that output voltage range is wide, good linearity and the high voltage signal of precision, analog voltage signal output circuit reliable and stable and with low cost again becomes a technical barrier.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thus provides a kind of analog voltage signal output circuit.
To achieve these goals, the technical scheme that the utility model adopts is: analog voltage signal output circuit, it comprises first order negative feedback amplifier circuit unit and second level negative feedback amplifier circuit unit, described first order negative feedback amplifier circuit unit comprises the first operational amplifier (U1A), resistance (R1), resistance (R2) and resistance (R3), one end of resistance (R1) connects DC power supply and its other end connects the inverting input of the first operational amplifier (U1A), the in-phase input end of described first operational amplifier (U1A) is connected with the D/A converter exporting analog voltage signal, one end of resistance (R2) connects the inverting input of the first operational amplifier (U1A), one end of resistance (R3) connects the output of the first operational amplifier (U1A), the other end of resistance (R2) and the other end of resistance (R3) are all connected with cathode output end, described second level negative feedback amplifier circuit unit comprises the second operational amplifier (U1B), resistance (R4), resistance (R5), resistance (R6) and resistance (R7), one end of resistance (R4) connects output and the resistance (R3) of the first operational amplifier (U1A), and the other end of resistance (R4) connects the inverting input of the second operational amplifier (U1B), the normal phase input end of the second operational amplifier (U1B) is by resistance (R5) ground connection, one end of resistance (R6) connects the inverting input of the second operational amplifier (U1B), one end of resistance (R7) connects the output of the second operational amplifier (U1B), the other end of resistance (R6) and the other end of resistance (R7) all connect cathode output end.
The utility model hinge structure has substantive distinguishing features and progress, specifically, analog voltage signal output circuit, D/A converter conversion output voltage obtains a voltage output signal after first order negative feedback amplifier circuit cell processing, and this voltage output signal is exported by cathode output end, the voltage output signal that a numerical value is contrary is obtained after the process of this voltage output signal by second level negative feedback amplifier circuit unit simultaneously, and this negative voltage output signal is exported by cathode output end, so just considerably increase the scope of output voltage signal, pass through the resistance of adjusting resistance (R3) resistance (R6) and resistance (R7) simultaneously, just good linearity can be obtained and the high voltage signal of precision, this circuit stability is reliable and with low cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of analog voltage signal output circuit in the utility model embodiment.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, analog voltage signal output circuit, it comprises first order negative feedback amplifier circuit unit and second level negative feedback amplifier circuit unit, described first order negative feedback amplifier circuit unit comprises the first operational amplifier (U1A), resistance (R1), resistance (R2) and resistance (R3), one end of resistance (R1) connects DC power supply and its other end connects the inverting input of the first operational amplifier (U1A), the in-phase input end of described first operational amplifier (U1A) is connected with the D/A converter exporting analog voltage signal Vi, one end of resistance (R2) connects the inverting input of the first operational amplifier (U1A), one end of resistance (R3) connects the output of the first operational amplifier (U1A), the other end of resistance (R2) and the other end of resistance (R3) are all connected with cathode output end Vo-, described second level negative feedback amplifier circuit unit comprises the second operational amplifier (U1B), resistance (R4), resistance (R5), resistance (R6) and resistance (R7), one end of resistance (R4) connects output and the resistance (R3) of the first operational amplifier (U1A), and the other end of resistance (R4) connects the inverting input of the second operational amplifier (U1B), the normal phase input end of the second operational amplifier (U1B) is by resistance (R5) ground connection, one end of resistance (R6) connects the inverting input of the second operational amplifier (U1B), one end of resistance (R7) connects the output of the second operational amplifier (U1B), the other end of resistance (R6) and the other end of resistance (R7) all connect cathode output end Vo+.
Wherein, first operational amplifier (U1A) and the second operational amplifier (U1B) model are the operational amplifier of LM2904, and the voltage of DC power supply is 5V, the calculating of the theory state broken by short in void in void, can draw in first order negative feedback amplifier circuit unit, U
1=2U
i-5, U in the negative feedback amplifier circuit unit of the second level
o+=2U
6-U
1, due to U
6=U
5=0V, so U
o+=-U
1.
The analog voltage signal output circuit of the present embodiment, D/A converter conversion output voltage obtains a voltage output signal after first order negative feedback amplifier circuit cell processing, and this voltage output signal is exported by cathode output end, the voltage output signal that a numerical value is contrary is obtained after the process of this voltage output signal by second level negative feedback amplifier circuit unit simultaneously, and this negative voltage output signal is exported by cathode output end, so just considerably increase the scope of output voltage signal, pass through the resistance of adjusting resistance (R3) resistance (R6) and resistance (R7) simultaneously, just good linearity can be obtained and the high voltage signal of precision, such as to obtain exporting for-10V ~ 10V and good linearity and the high voltage signal of precision, the resistance of resistance (R1) can be set as 20 k Ω, the resistance of resistance (R2) is set as 20 k Ω, the resistance of resistance (R3) is set as 51 Ω, the resistance of resistance (R4) is set as 20 k Ω, the resistance of resistance (R5) is set as 10 k Ω, the resistance of resistance (R6) is set as 2 k Ω, the resistance of resistance (R7) is set as 51 Ω, D/A converter changes output voltage into 0 ~ 5V, like this, work as U
iduring=0V, U
1=-5V, U
o-=-5V, U
o+=5V, works as U
iduring=5V, U
1=5V, U
o-=5V, U
o+=-5V, this circuit stability is reliable and with low cost.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (1)
1. analog voltage signal output circuit, it is characterized in that: it comprises first order negative feedback amplifier circuit unit and second level negative feedback amplifier circuit unit, described first order negative feedback amplifier circuit unit comprises the first operational amplifier (U1A), resistance (R1), resistance (R2) and resistance (R3), one end of resistance (R1) connects DC power supply and its other end connects the inverting input of the first operational amplifier (U1A), the in-phase input end of described first operational amplifier (U1A) is connected with the D/A converter exporting analog voltage signal, one end of resistance (R2) connects the inverting input of the first operational amplifier (U1A), one end of resistance (R3) connects the output of the first operational amplifier (U1A), the other end of resistance (R2) and the other end of resistance (R3) are all connected with cathode output end, described second level negative feedback amplifier circuit unit comprises the second operational amplifier (U1B), resistance (R4), resistance (R5), resistance (R6) and resistance (R7), one end of resistance (R4) connects output and the resistance (R3) of the first operational amplifier (U1A), and the other end of resistance (R4) connects the inverting input of the second operational amplifier (U1B), the normal phase input end of the second operational amplifier (U1B) is by resistance (R5) ground connection, one end of resistance (R6) connects the inverting input of the second operational amplifier (U1B), one end of resistance (R7) connects the output of the second operational amplifier (U1B), the other end of resistance (R6) and the other end of resistance (R7) all connect cathode output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420402387.9U CN204046529U (en) | 2014-07-21 | 2014-07-21 | Analog voltage signal output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420402387.9U CN204046529U (en) | 2014-07-21 | 2014-07-21 | Analog voltage signal output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204046529U true CN204046529U (en) | 2014-12-24 |
Family
ID=52247150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420402387.9U Active CN204046529U (en) | 2014-07-21 | 2014-07-21 | Analog voltage signal output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204046529U (en) |
-
2014
- 2014-07-21 CN CN201420402387.9U patent/CN204046529U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |