CN202513884U - Broken line direct-current amplifier - Google Patents
Broken line direct-current amplifier Download PDFInfo
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- CN202513884U CN202513884U CN2012201211171U CN201220121117U CN202513884U CN 202513884 U CN202513884 U CN 202513884U CN 2012201211171 U CN2012201211171 U CN 2012201211171U CN 201220121117 U CN201220121117 U CN 201220121117U CN 202513884 U CN202513884 U CN 202513884U
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- resistance
- operational amplifier
- input
- amplifier
- broken line
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Abstract
The utility model discloses a broken line direct-current amplifier. The broken line direct-current amplifier comprises an operational amplifier, and is characterized by also comprising an input resistor, a first resistor and a plurality of negative feedback branches, wherein an inverting input end of the operational amplifier is connected with the input resistor; the negative feedback branches are connected in parallel between the inverting input end and an output end of the operational amplifier; and the first resistor is connected between the inverting input end and the output end of the operational amplifier. By designing the broken line direct-current amplifier consisting of the operational amplifier, the input resistor, the first resistor and the inverting feedback branches, the amplification factor of a small signal can be increased, the dynamic range of an input signal can be extended, and a continuous broken line voltage output signal can be acquired, so that logarithmic amplification curve can be simulated. The broken line direct-current amplifier can be widely applied to voltage amplification, current amplification and control circuits and driving circuits which are required to be adjusted continuously.
Description
Technical field
The utility model relates to the amplifier technical field, refers to a kind of broken line direct current amplifier particularly.
Background technology
Linear DC amplifying circuit based on operational amplifier is usually used in signal processing, because gain is fixed, the small-signal of input and large-signal all have been exaggerated same multiple.The amplitude output signal of operational amplifier can not be higher than power supply.Influenced by this, big gain can improve the multiplication factor of small-signal, but the dynamic range of input signal is limited; Little gain can strengthen the dynamic range of input signal, but the enlargement range of small-signal is limited.
Be the multiplication factor of raising small-signal, and strengthen the dynamic range of input signal, can use the logarithm amplifying circuit, utilize the index of logarithm amplifying circuit to amplify characteristics, multiplication factor is bigger in the time of the small-signal input, and multiplication factor is less in the time of the large-signal input.But logarithm amplifying circuit temperature influence needs to adopt complicated temperature-compensation circuit to improve the temperature stability of circuit.
Summary of the invention
The purpose of the utility model will provide a kind of broken line direct current amplifier exactly, and it can use simple relatively circuit, improves the multiplication factor of small-signal and the dynamic range of input signal simultaneously, and obtains continuous broken line voltage output signal and simulation logarithm amplified curve.
For realizing this purpose; The broken line direct current amplifier that the utility model designed comprises operational amplifier, it is characterized in that: it also comprises input resistance, first resistance, a plurality of negative feedback branch road; Wherein, The inverting input of said operational amplifier connects input resistance, and parallelly connected a plurality of negative feedback branch roads between the inverting input of said operational amplifier and the output connect first resistance between the inverting input of said operational amplifier and the output.
First kind of structure of technique scheme: said each negative feedback branch road comprises second resistance and voltage-stabiliser tube, and the negative pole of said voltage-stabiliser tube is through the second resistance concatenation operation amplifier's inverting input, the output of the anodal concatenation operation amplifier of voltage-stabiliser tube; The inverting input of said operational amplifier connects power supply, the in-phase input end ground connection of said operational amplifier through input resistance.
Second kind of structure of technique scheme: said each negative feedback branch road comprises second resistance and voltage-stabiliser tube, the output of the negative pole concatenation operation amplifier of said voltage-stabiliser tube, and the positive pole of voltage-stabiliser tube is through the second resistance concatenation operation amplifier's inverting input; The inverting input of said operational amplifier is through input resistance ground connection, and the in-phase input end of said operational amplifier connects power supply.
The broken line direct current amplifier that the utility model is made up of operational amplifier, input resistance, first resistance, a plurality of negative feedback branch road through design; Make this broken line direct current amplifier can improve the multiplication factor of small-signal and the dynamic range of input signal simultaneously; And obtain continuous broken line voltage output signal, simulate the logarithm amplified curve.The utility model can be widely used in voltage amplification, and electric current amplifies, and needs continuously adjustable control, drive circuit.
Description of drawings
Fig. 1 is the circuit diagram of embodiment 1.
Fig. 2 is the circuit diagram of embodiment 2.
Fig. 3 is the amplifier of discounting (being embodiment 1) the input and output voltage graph of a relation of reverse input.
Wherein, 1-operational amplifier, 2-input resistance, 3-first resistance, 4-second resistance, 5-voltage-stabiliser tube.The direction of arrow among Fig. 1 and 2 is current direction.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:
Introduce the operation principle of the utility model below with embodiment 1: among the embodiment 1, the broken line amplifier input signal of reverse input can be voltage signal Ui or current signal Ii.The output signal is U
0Voltage-stabiliser tube 5 sorts successively according to the height of conducting voltage and is V1 to Vn, its conducting voltage relation for V1＜V2＜...＜Vn.
Work as U
0＜V
1The time, V
1～V
nNot conducting of branch road, electric current are all flow through from first resistance, 3 branch roads, and the parallelly connected equivalent resistance of first resistance, 3 feedback branches is R
0, so output voltage is:
(wherein, I
0Be the electric current that first resistance 3 flows through, R
iResistance for input resistance 2 correspondences)
When input voltage or input current continue to increase, make V
1＜U
0＜V
2The time, the V1 branch road begins conducting, but other not conductings of branch road.If I
iIncrement is Δ I
i, R wherein
0The current increment of branch road is Δ I
0, R
1The current increment of branch road is Δ I
1, and R
0Branch road and R
1The voltage increment Δ U of branch road equates, then has:
ΔU＝R
0ΔI
0
ΔU＝R
1ΔI
1
R so
0, R
1Equivalent resistance do
The output voltage of amplifier does
Similarly, work as V
2＜U
0＜V
3The time, the broken line slope is (R0//R1//R2).Work as V
N-1＜U
0＜V
nThe time, the broken line slope be (R0//R1//... //Rn).The equivalent resistance of symbol " // " in following formula expression parallel resistance is represented the equivalent resistance after resistance R 0, resistance R 1 and resistance R 2 parallel connections like R0//R1//R2.The input and output voltage relation of anti-phase input amplifier is as shown in Figure 3.Can see that its output voltage is continuous sectional broken line, the slope of every section broken line is the parallel resistance of feedback branch.Select suitable voltage-stabiliser tube and feedback resistance can let broken line simulate the logarithm amplified curve.The logarithm amplified curve of above-mentioned simulation does not receive Influence of Temperature, and is better to the adaptability of environment.
The content that this specification is not done to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (3)
1. broken line direct current amplifier; Comprise operational amplifier (1); It is characterized in that: it also comprises input resistance (2), first resistance (3), a plurality of negative feedback branch road, and wherein, the inverting input of said operational amplifier (1) connects input resistance (2); Parallelly connected a plurality of negative feedback branch roads between the inverting input of said operational amplifier (1) and the output connect first resistance (3) between the inverting input of said operational amplifier (1) and the output.
2. broken line direct current amplifier according to claim 1; It is characterized in that: said each negative feedback branch road comprises second resistance (4) and voltage-stabiliser tube (5); The negative pole of said voltage-stabiliser tube (5) is through the inverting input of second resistance (4) concatenation operation amplifier (1), the output of the anodal concatenation operation amplifier (1) of voltage-stabiliser tube (5); The inverting input of said operational amplifier (1) connects power supply, the in-phase input end ground connection of said operational amplifier (1) through input resistance (2).
3. broken line direct current amplifier according to claim 1; It is characterized in that: said each negative feedback branch road comprises second resistance (4) and voltage-stabiliser tube (5); The output of the negative pole concatenation operation amplifier (1) of said voltage-stabiliser tube (5), the positive pole of voltage-stabiliser tube (5) is through the inverting input of second resistance (4) concatenation operation amplifier (1); The inverting input of said operational amplifier (1) is through input resistance (2) ground connection, and the in-phase input end of said operational amplifier (1) connects power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201211171U CN202513884U (en) | 2012-03-27 | 2012-03-27 | Broken line direct-current amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201211171U CN202513884U (en) | 2012-03-27 | 2012-03-27 | Broken line direct-current amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202513884U true CN202513884U (en) | 2012-10-31 |
Family
ID=47066339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201211171U Expired - Fee Related CN202513884U (en) | 2012-03-27 | 2012-03-27 | Broken line direct-current amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202513884U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624343A (en) * | 2012-03-27 | 2012-08-01 | 武汉市康达电气有限公司 | Broken line direct-current amplifier |
| CN102931937A (en) * | 2012-11-26 | 2013-02-13 | 昆山北极光电子科技有限公司 | Hardware fitting method of exponential decay curve |
-
2012
- 2012-03-27 CN CN2012201211171U patent/CN202513884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624343A (en) * | 2012-03-27 | 2012-08-01 | 武汉市康达电气有限公司 | Broken line direct-current amplifier |
| CN102931937A (en) * | 2012-11-26 | 2013-02-13 | 昆山北极光电子科技有限公司 | Hardware fitting method of exponential decay curve |
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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: 20121031 Termination date: 20150327 |
|
| EXPY | Termination of patent right or utility model |