CN1184737C - Analog-digital converter - Google Patents
Analog-digital converter Download PDFInfo
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- CN1184737C CN1184737C CNB011409517A CN01140951A CN1184737C CN 1184737 C CN1184737 C CN 1184737C CN B011409517 A CNB011409517 A CN B011409517A CN 01140951 A CN01140951 A CN 01140951A CN 1184737 C CN1184737 C CN 1184737C
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Abstract
The present invention relates to an analog-digital converter which is integrated in a microcontroller on a single chip. The analog-digital converter comprises an adjustable gain amplifier and a n bit analog-digital converter, wherein the adjustable gain amplifier is used for making an input analog voltage signal V1 correspond to a reference voltage signal V2 to obtain a relative analog voltage signal V1-V2, the relative analog voltage signal is amplified by responding the corresponding relation of a gain function A, and an amplified analog voltage signal A (V1-V2) is further output; the reference voltage of the n bit analog-digital converter is Vr, the n bit analog-digital converter is electrically connected to the output of the adjustable gain amplifier, and is used for converting the amplified analog voltage signal into a digital voltage signal to be output. The present invention is characterized in that the gain function of the adjustable gain amplifier is provided for the microcontroller for adjustment according to the relation between the reference voltage Vr and the input relative analog voltage signal peak values, and the good degree of digital signal analysis is obtained.
Description
Technical field
The present invention relates to a kind of analog-digital commutator, particularly be integrated in the analog-digital commutator in the microcontroller on the single-chip.
Background technology
In digital circuit now, the application of analog-digital converter is very wide, and especially in microcontroller, great majority have had analog-digital converter all and finished the analog digital switching motion.Referring to Fig. 1, it is the function block schematic diagram of finishing on single-chip and including the public microcontroller 10 of an analog-digital converter 101, and the specification of general analog-digital converter is the figure place of reference voltage and output digital signal.For clearly demonstrating, analog-digital converter 101 is defined as for example 8 analog-digital converters of reference voltage 5 volts (V), meaning is that its scope of accepting for the analog signal of being imported is 5 volts, the figure place of the digital signal of exporting then is 8, so the resolution of this analog-digital converter just is 5V/255 (being 28-1)=19.6 millivolts (mV).Therefore under normal condition, be fit to voltage strength is positioned at 8 analog-digital converters and export after 0 to 5 volt analog signal conversion becomes 0 to 255 digital signal, but because the difference of application, the voltage strength of the analog signal of importing will have very big difference, for example, it is 75+75sin (wt) millivolt (mV) that an input analog signal is arranged, be that it is that a peak value only is the sinusoidal analog signal of 150 millivolts (mV), the digital signal maximum changed out of described analog-digital converter will only be 8 (150/19.6=7.653) this moment, and then cause causing because of signal strength signal intensity is too small not good the and bad disappearance of resolution of overall utilization rate (9/256).
And for the consideration of cost, the figure place that increases analog-digital converter is more infeasible way, and the analog-digital converter of big figure place, will increase its required change-over time, and required operating current is also bigger, and based on described all factors, how under the situation that does not increase actual number of bits, the disappearance that solves described communal technique is development main purpose of the present invention.
Summary of the invention
The present invention is a kind of analog-digital commutator, be integrated in the microcontroller on the single-chip, this device includes: a variable gain amplifier, the relative analog voltage signal V1-V2 that it obtains after corresponding to a reference voltage V 2 in order to the analog voltage signal V1 that will be imported, the corresponding relation that responds a gain function A again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal A (V1-V2); An and n position analog-digital converter, its reference voltage is Vr, be electrically connected on the output of this variable gain amplifier, it was exported after analog voltage signal converts a digital voltage signal in order to amplifying, it is characterized in that, the gain function of this variable gain amplifier can be adjusted with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage Vr for this microcontroller, and then reaches preferable digital signal resolution.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected on this reference voltage V 2 and is between zero the place and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish the variable gain amplifier of a gain function A for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected between this reference voltage V 2 and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish with respect to a gain function of reference voltage V 2 variable gain amplifier for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this inverting input input, and this reference voltage V 2 is then by this non-inverting input input; One load resistance RL is electrically connected between analog voltage signal V1 and this inverting input, a npn transistor, and its collector electrode is connected to this inverting input, and emitter is connected to this output, and base stage then is connected to this non-inverting input; One fixed resistor R1 is electrically connected on this non-inverting input; And a variable resistance R2, be electrically connected on this output and this fixed resistor R1, in order to finish variable gain amplifier with respect to a logarithm gain function of reference voltage V 2.
Another aspect of the invention is a kind of analog-digital commutator, be integrated in the microcontroller, its device comprises: a variable gain amplifier, the relative analog voltage signal V1-V2 that it obtains after corresponding to a reference voltage V 2 in order to the analog voltage signal V1 that will be imported, the corresponding relation that responds a gain function A again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal A (V1-V2); An and n position analog-digital converter, its reference voltage is Vr, be electrically connected on the output of this variable gain amplifier, it was exported after analog voltage signal converts a digital voltage signal in order to amplifying, it is characterized in that, the gain function of this variable gain amplifier can be adjusted with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage Vr for this microcontroller, and then reaches preferable digital signal resolution.
According to described conception, all elements in the analog-digital commutator in this microcontroller are to finish on a single-chip.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected on this reference voltage V 2 and is between zero the place and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish the variable gain amplifier of a gain function A for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected between this reference voltage V 2 and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish with respect to a gain function of reference voltage V 2 variable gain amplifier for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this inverting input input, and this reference voltage V 2 is then by this non-inverting input input; One load resistance RL is electrically connected between analog voltage signal V1 and this inverting input, a npn transistor, and its collector electrode is connected to this inverting input, and emitter is connected to this output, and base stage then is connected to this non-inverting input; One fixed resistor R1 is electrically connected on this non-inverting input; And a variable resistance R2, be electrically connected on this output and this fixed resistor R1, in order to finish variable gain amplifier with respect to a logarithm gain function of reference voltage V 2.
Another aspect of the present invention is a kind of analog-digital commutator, its device comprises: a variable gain amplifier, the relative analog voltage signal V1-V2 that it obtains after corresponding to a reference voltage V 2 in order to the analog voltage signal V1 that will be imported, the corresponding relation that responds a gain function A again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal A (V1-V2); An and n position analog-digital converter, its reference voltage is Vr, be electrically connected on the output of this variable gain amplifier, it was exported after analog voltage signal converts a digital voltage signal in order to amplifying, it is characterized in that, the gain function of this variable gain amplifier can be adjusted with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage Vr, and then reaches preferable digital signal resolution.
According to described conception, analog-digital commutator is to be integrated in the microcontroller, and this microcontroller is finished on a single-chip.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected on this reference voltage V 2 and is between zero the place and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish the variable gain amplifier of a gain function A for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this non-inverting input input, and this output is connected to this n position analog-digital converter; One fixed resistor R1 is electrically connected between this reference voltage V 2 and this inverting input; And a variable resistance R2, be electrically connected between this inverting input and this output, in order to finish with respect to a gain function of reference voltage V 2 variable gain amplifier for (R1+R2)/R1.
According to described conception, this variable gain amplifier comprises in the analog-digital commutator: an operational amplifier, and it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal V1 is by this inverting input input, and this reference voltage V 2 is then by this non-inverting input input; One load resistance RL is electrically connected between analog voltage signal V1 and this inverting input; One npn transistor, its collector electrode is connected to this inverting input; Emitter is connected to this output, and base stage then is connected to this non-inverting input; One fixed resistor R1 is electrically connected on this non-inverting input; And a variable resistance R2, be electrically connected on this output and this fixed resistor R1, in order to finish variable gain amplifier with respect to a logarithm gain function of reference voltage V 2.
Description of drawings
The present invention is by following accompanying drawing and detailed description, so that more deep understanding:
Fig. 1 is the function block schematic diagram of finishing on single-chip and including the public microcontroller of an analog-digital converter.
The embodiment calcspar of Fig. 2 analog-digital commutator that public disappearance develops for the present invention solves.
Fig. 3 the present invention is directed to this variable gain amplifier, develops the first preferred embodiment circuit diagram that among the various embodiment according to the functional requirement difference.
Fig. 4 A-B is first preferred embodiment and the second preferred embodiment circuit diagram of variable resistance R2.
Fig. 5 the present invention is directed to this variable gain amplifier, develops the second preferred embodiment circuit diagram that among the various embodiment according to the functional requirement difference.
Fig. 6 the present invention is directed to this variable gain amplifier, develops the 3rd preferred embodiment circuit diagram that among the various embodiment according to the functional requirement difference.
Embodiment
Referring to Fig. 2, it is the embodiment calcspar of the present invention for the solution analog-digital commutator that public disappearance develops, it mainly is made of a variable gain amplifier 21 and a n position analog-digital converter 22, and described element is to be integrated on the microcontroller 2, and microcontroller 2 is then finished among a single-chip.
Described variable gain amplifier 21 mainly obtains a relative analog voltage signal V1-V2 in order to the analog voltage signal V1 that will be imported after corresponding to a reference voltage V 2, the corresponding relation that responds a gain function A again carries out the amplification action of this relative analog voltage signal, and then export one and amplify analog voltage signal A (V1-V2), wherein the big I of gain function A changes by a control signal.Reference voltage is that the n position analog-digital converter 22 of Vr was then exported after analog voltage signal converts a digital voltage signal in order to amplifying.The present invention is characterized in, the gain function of this variable gain amplifier can send this control signal adjusting according to reference voltage Vr and the magnitude relationship between this relative analog voltage signal peak value of being imported for this microcontroller, and then reaches preferable digital signal resolution and show.Again referring to Fig. 3, it is at this variable gain amplifier 21, develop first preferred embodiment that among the various embodiment according to functional requirement is different, wherein include an operational amplifier 31, it mainly has an inverting input 311, a non-inverting input 312 and an output 313, described analog voltage signal V1 is by these non-inverting input 312 inputs, and this output is connected to this n position analog-digital converter 22.Also have in addition and be electrically connected on the fixed resistor R1 that this reference voltage V 2 is 311 of zero place and this inverting inputs, and the variable resistance R2 that is electrically connected on 313 of this inverting input 311 and this outputs.Circuit characteristic according to operational amplifier, can obtain the variable gain amplifier of a gain function A for (R1+R2)/R1, and the amplification analog voltage signal V3 that output 313 is exported equals A (V1-V2), and because A=(R1+R2)/R1, V2=0, so V3=(R1+R2) V1/R1.
For asking clear understandable, describe with the identical instances of being lifted in the background of invention section again.Promptly, n position analog-digital converter 22 is defined as 8 analog-digital converters of reference voltage Vr=5 volt (V), and work as an analog voltage signal V1 who is imported is 75+75sin (wt) millivolt (mV), be that it is that a peak value is not more than the sinusoidal analog signal of 150 millivolts (mV), therefore this microcontroller just can be according to the magnitude relationship (ratio be 5/0.15=100/3) of reference voltage 5 volts (V) with this relative analog voltage signal peak value 150 millivolts (mV) of being imported, and the resistance value of variable resistance R2 is adjusted, and then the gain function A of variable gain amplifier is adjusted into as far as possible is not more than 100/3 near 100/3 by control signal.And actual practice is that can to adjust variable resistance R2 be 31R1, make A=32, so just, can obtain the amplification analog voltage signal V3 of voltage signal peak value 4.8 volts (V), and then the overall utilization rate of described analog-digital converter can be improved (reference voltage of 5 volts (V) can make full use of 4.8 volts) and increase the resolution (increase the resolution of log232=5 position approximately, and with the performance boost to 13 of 8 analog-digital converters) of digital signal.
And variable resistance R2 be can utilize resistance 411,412 shown in Fig. 4 A-B ..., 41n and controlled switch 421,422 ..., the circuit that constituted such as 42n finishes, its variation should be those skilled in the art institute and can freely change, so do not repeat them here.
Referring to Fig. 5, it is at this variable gain amplifier 21, develop second preferred embodiment that among the various embodiment according to functional requirement is different, wherein include an operational amplifier 51, it mainly has an inverting input 511, a non-inverting input 512 and an output 513, described analog voltage signal V1 is by these non-inverting input 512 inputs, and this output is connected to this n position analog-digital converter 22.Also have the fixed resistor R1 that is electrically connected on 511 of this reference voltage V 2 and this inverting inputs in addition, and the variable resistance R2 that is electrically connected on 513 of this inverting input 511 and this outputs.According to the circuit characteristic of operational amplifier, can obtain (V3-V2)=A, (V1-V2), (relation is amplified in the differential input of A=(R1+R2)/R1), mainly is the situation that can be applicable to desire to obtain near the high-res effect of change in voltage this reference voltage V 2.
Referring to Fig. 6, it is at this variable gain amplifier 21, develop the 3rd preferred embodiment that among the various embodiment according to functional requirement is different, wherein include an operational amplifier 61, it has an inverting input 611, a non-inverting input 612 and an output 613, wherein this analog voltage signal V1 is by these inverting input 611 inputs, and this reference voltage V 2 is then by these non-inverting input 612 outputs.As for the load resistance RL that is electrically connected on 611 of analog voltage signal V1 and this inverting inputs, its collector electrode is connected to this inverting input 611, emitter and is connected to the npn transistor 614 that this output 613, base stage then are connected to this non-inverting input 612, be electrically connected on the fixed resistor R1 of this non-inverting input 612, and the variable resistance R2 that is electrically connected on this output 613 and this fixed resistor R1, then be in order to finish a variable gain amplifier with respect to a non-linear gain function of reference voltage V 2 jointly.One logarithmic amplifier that is different from described linear amplifier so will be provided, in order to the dynamic range that increases this analog voltage signal V1 than after, take out different multiplying with the dividing potential drop mode again and supply with 22 uses of follow-up n position analog-digital converter.
In sum, the present invention is under the situation of the actual number of bits that does not increase analog-digital converter, thoroughly the described communal technique overall utilization rate of solution is crossed low and is caused the not good defective of resolution, and according to the different various embodiment that of developing of functional requirement, then can reach effects such as near the high-res effect of change in voltage reference voltage V 2 or the dynamic range of increase analog voltage signal V1 compare promotes, thoroughly improve public defective, reach development main purpose of the present invention.The present invention executes that the craftsman thinks and is to modify the scope of right neither disengaging institute of the present invention desire protection as all so must be appointed by those skilled in the art.
Claims (14)
1. an analog-digital commutator is integrated in the microcontroller on the single-chip, and this device includes:
One variable gain amplifier, it is a relative analog voltage signal (V1-V2) that obtains after corresponding to a reference voltage (V2) in order to the analog voltage signal (V1) that will be imported, the corresponding relation that responds a gain function (A) again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal (A (V1-V2)); And
One n position analog-digital converter, it has a reference voltage (Vr), and is electrically connected on the output of this variable gain amplifier, and it was exported after analog voltage signal converts a digital voltage signal in order to amplifying,
It is characterized in that the gain function of this variable gain amplifier is to adjust with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage (Vr) for this microcontroller, and then reaches preferable digital signal resolution.
2. analog-digital commutator as claimed in claim 1, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor (R1) is electrically connected on this reference voltage (V2) and is between zero the place and this inverting input; And
One variable resistance (R2) is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to finish a gain function (A).
3. analog-digital commutator as claimed in claim 1, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor (R1) is electrically connected between this reference voltage (V2) and this inverting input; And
One variable resistance (R2) is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to a gain function of finishing with respect to reference voltage (V2).
4. analog-digital commutator as claimed in claim 1, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this inverting input input, this reference voltage (V2) is then by this non-inverting input input;
One load resistance (RL) is electrically connected between analog voltage signal (V1) and this inverting input;
One npn transistor, its collector electrode is connected to this inverting input, and emitter is connected to this output, and base stage then is connected to this non-inverting input;
One fixed resistor (R1) is electrically connected on this non-inverting input; And
One variable resistance (R2) is electrically connected on this output and this fixed resistor (R1), in order to finish the variable gain amplifier with respect to a logarithm gain function of reference voltage (V2).
5. an analog-digital commutator is integrated in the microcontroller, and its device comprises:
One variable gain amplifier, it is a relative analog voltage signal (V1-V2) that obtains after corresponding to a reference voltage (V2) in order to the analog voltage signal (V1) that will be imported, the corresponding relation that responds a gain function (A) again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal (A (V1-V2)); And
One n position analog-digital converter, it has a reference voltage (Vr), and is electrically connected on the output of this variable gain amplifier, and it is to export after analog voltage signal converts a digital voltage signal in order to amplifying,
It is characterized in that the gain function of this variable gain amplifier is to adjust with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage (Vr) for this microcontroller, and then reaches preferable digital signal resolution.
6. analog-digital commutator as claimed in claim 5, wherein all elements in this microcontroller are to finish on a single-chip.
7. analog-digital commutator as claimed in claim 5, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor (R1) is electrically connected on this reference voltage (V2) and is between zero the place and this inverting input; And
One variable resistance (R2) is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to finish a gain function (A).
8. analog-digital commutator as claimed in claim 5, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor (R1) is electrically connected between this reference voltage (V2) and this inverting input; And
One variable resistance (R2) is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to a gain function of finishing with respect to reference voltage (V2).
9. analog-digital commutator as claimed in claim 5, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this inverting input input, this reference voltage (V2) is then by this non-inverting input input;
One load resistance (RL) is electrically connected between analog voltage signal (V1) and this inverting input;
One npn transistor, its collector electrode is connected to this inverting input, and emitter is connected to this output, and base stage then is connected to this non-inverting input;
One fixed resistor (R1) is electrically connected on this non-inverting input; And
One variable resistance (R2) is electrically connected on this output and this fixed resistor (R1), in order to finish the variable gain amplifier with respect to a logarithm gain function of reference voltage (V2).
10. analog-digital commutator, its device comprises:
One variable gain amplifier, the relative analog voltage signal (V1-V2) that it obtains after corresponding to a reference voltage (V2) in order to the analog voltage signal (V1) that will be imported, the corresponding relation that responds a gain function (A) again carries out the amplification action of this relative analog voltage signal, and then exports one and amplify analog voltage signal (A (V1-V2)); And
One n position analog-digital converter, it has a reference voltage (Vr), and is electrically connected on the output of this variable gain amplifier, and it is to export after analog voltage signal converts a digital voltage signal in order to amplifying,
It is characterized in that the gain function of this variable gain amplifier is to adjust with the magnitude relationship between this relative analog voltage signal peak value of being imported according to reference voltage (Vr), and then reaches preferable digital signal resolution.
11. analog-digital commutator as claimed in claim 10, it is to be integrated in the microcontroller, and this microcontroller is to finish on a single-chip.
12. analog-digital commutator as claimed in claim 10, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor R1 is electrically connected on this reference voltage (V2) and is between zero the place and this inverting input; And
One variable resistance R2 is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to finish a gain function (A).
13. analog-digital commutator as claimed in claim 10, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this non-inverting input input, and this output is connected to this n position analog-digital converter;
One fixed resistor (R1) is electrically connected between this reference voltage (V2) and this inverting input; And
One variable resistance (R2) is electrically connected between this inverting input and this output, is the variable gain amplifier of (R1+R2)/R1 in order to a gain function of finishing with respect to reference voltage (V2).
14. analog-digital commutator as claimed in claim 10, wherein this variable gain amplifier comprises:
One operational amplifier, it has an inverting input; One non-inverting input; And an output, wherein this analog voltage signal (V1) is by this inverting input input, this reference voltage V 2 is then by this non-inverting input input;
One load resistance (RL) is electrically connected between analog voltage signal (V1) and this inverting input;
One npn transistor, its collector electrode is connected to this inverting input, and emitter is connected to this output, and base stage then is connected to this non-inverting input;
One fixed resistor (R1) is electrically connected on this non-inverting input; And
One variable resistance (R2) is electrically connected on this output and this fixed resistor (R1), in order to finish the variable gain amplifier with respect to a logarithm gain function of reference voltage (V2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011409517A CN1184737C (en) | 2001-09-27 | 2001-09-27 | Analog-digital converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011409517A CN1184737C (en) | 2001-09-27 | 2001-09-27 | Analog-digital converter |
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| CN1411141A CN1411141A (en) | 2003-04-16 |
| CN1184737C true CN1184737C (en) | 2005-01-12 |
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| CNB011409517A Expired - Fee Related CN1184737C (en) | 2001-09-27 | 2001-09-27 | Analog-digital converter |
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| CN100422899C (en) * | 2005-10-12 | 2008-10-01 | 扬智科技股份有限公司 | Regulating apparatus of output voltage |
| DK2176545T3 (en) * | 2007-07-12 | 2014-12-15 | Windurance Llc | Method and apparatus for nettabs-flow for wind turbine pitch-management system |
| CN108344688A (en) | 2017-01-24 | 2018-07-31 | 谱钜科技股份有限公司 | Spectrometer and its spectral measurement method |
| TWI734156B (en) * | 2019-07-26 | 2021-07-21 | 義隆電子股份有限公司 | Smoke sensing device |
| CN113805843B (en) * | 2021-09-24 | 2024-03-19 | 上海集成电路装备材料产业创新中心有限公司 | Maximum value solving circuit and maximum value solving method |
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