[introduction]Voltage comparator is put by compositive carry normally form, what with common use discharge road differs is, the compositive carry enlarge in comparator is in open loop or the condition that feedbacking more. Want to input end to add a very small signal in two only, carry is put can enter nonlinear area, those who belong to compositive carry to put is nonlinear use range. When analysing comparator, principle of empty open circuit still holds water, the concept such as empty weak point and empty ground just suits when judging critical condition only.

What is voltage comparator

Voltage comparator is put by compositive carry normally form, what with common use discharge road differs is, the compositive carry enlarge in comparator is in open loop or the condition that feedbacking more. Want to input end to add a very small signal in two only, carry is put can enter nonlinear area, those who belong to compositive carry to put is nonlinear use range. When analysing comparator, principle of empty open circuit still holds water, the concept such as empty weak point and empty ground just suits when judging critical condition only.

Normally the job is in voltage comparator nonlinear area. Because the main function of voltage comparator is the size that compares two voltage,this is, output the signal of tall n or low n according to comparing a result. In this process, it does not need to undertake linear enlarge to inputting signal, however the basis inputs the relation between signal and referenced voltage, direct output expresses to compare the digital signal of the result.

Accordingly, the work area of voltage comparator basically depends on the design of its interior circuit and working principle, is not to resemble linear amplifier needing the job to be inside specific linear area in that way. Of course, specific voltage comparator may be mixed because of design, workmanship those who use requirement is different and somewhat difference, but its work basically principle and work area are similar.

The working limits of voltage comparator is to be inside certain voltage limits normally, specific working limits depends on the design of comparator and norms. Generally speaking, the working limits of voltage comparator may differ to a few volt from a few volt, some comparator may have wider working range, can handle taller or lower tension.

Say simply, voltage comparator is right two imitate voltage compares its size (also have two numbers voltage relative, do not introduce here) , judge piece among them which voltage is tall, if pursue,1 is shown. Graph 1 (A) it is comparator, it has two inputs end: Inphase input is carried (” + ” upright) reach input end instead (” – ” upright) , an output carries Vout (output n signal) . Have power source V+ and land additionally (this is a comparator of only power source) , inphase end inputs voltage VA, carry input VB instead. If the change of VA and VB pursues 1 (B) be shown. In time when 0 ～ T1, VA ” VB; When T1 ～ T2, VB ” VA; When T2 ～ T3, VA ” VB. Below this kind of circumstance, if the output of Vout pursues 1 (C) be shown: VA ” when VB, vout outputs tall n (saturated output) ; VB ” when VA, vout outputs low n. According to output the discretion of n can know which voltage is big.

If go to VA input to be carried instead, VB inputs inphase end, the voltage change of VA and VB still is like a graph 1 (B) be shown, criterion if Vout output pursues 1 (D) be shown. With the graph 1 (C) quite, its outputted n to fall. The input end that outputs n change and VA, VB is concerned.

Voltage comparator and voltage follow implement same

Voltage comparator and voltage follow implement the circuit element that is two kinds of different functions, they exist to be distinguished significantly in the application in circuit and action.

The main effect of voltage comparator is two the voltage that inputs signal undertakes comparative, output the difference between them. This kind of circuit is applied at switch control, power source is monitored and be being measured to wait for a respect normally. A of voltage comparator common type is to cross 0 comparator, it inputs an imitate signal and a fixed referenced voltage to undertake comparative. The working character of comparator is described normally through threshold value voltage with transmission character.

And voltage follows implement, also call buffer amplifier, its are main the characteristic is his output voltage and input voltage are identical, without the enlarge action of gain, but voltaic gain increases. Voltage follows implement main effect is the impedance that will input voltage changeover is inferior output voltage impedance, provide the function that voltaic enlarge and voltage follow. This kind of circuit is general use as in actual circuit output level or segregation class, can join two circuit, reduce the effect that place is linked together to bring directly between circuit, have amortize effect.

Accordingly, voltage comparator and voltage follow implement differ somewhat on function, application and working principle, cannot be regarded as identical or interchangeable circuit element.

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