In all modular signal and differentiate and analyse of wrong standard signal

 

Wrong standard says to string together a model again, those who point to is the signal poor value between two lines; And in all modular noise weighs right noise again, those who point to is two lines be opposite respectively the noise of the ground.

 

To A of a pair of line, B, the interference that need a standard is equivalent to increasing an interference tension between A and B, in all modular interference is equivalent to parting to increase an interference tension between B and A and ground, ground.

 

Transmitting the signal that need branch what resemble seeing usually with double skeining thread is to eliminate in all modular noise, the principle is very simple, two lines are twisted together, those who get in all modular interference voltage is very adjacent, ua – Ub still it doesn’t matter changes, of course this is good case. For instance, RS422/485 bus line uses a kind of when need minute of transmission signal specific application namely.

 

In applying actually, the influence of all sorts of the change of temperature, environment noise can be inspected as in all modular noise signal. But if be in transmission process, the right noise of two lines sad those who decrease is different big, make voltage existed to differ between two lines, at this moment in all modular noise became wrong standard noise with respect to change.

 

The signal that need branch is not must for opposite ground, if a line is of ground connection, their poor value is the value of opposite ground, the Chan Duan of the circuit needing branch that this has told in imitate circuit namely inputs a circumstance.

 

Difference divides amplifier, differ modular input, wrong standard is opposite in all for the model. Poor cent is a kind of means.

 

& of wrong standard signal in all modular signal&Difference divides enlarge circuit

 

E.g. , if an ADC has two imitate to input end, and AD changeover depends on as a result these two inputs carry the difference of voltage, so we say this ADC is the input that need branch, close end of input of these two imitate together to call the input that need branch end. But the tension that is increased on end of the input that need branch is not constant always be size equal way is opposite, the symbol is the same as even below a lot of circumstances. (Note: Not be certainly namely losing) we call their difference the input that need a standard, and the capacity that shares them (namely average) be called in all modular input.

 

Difference divides be form of a kind of circuit to make a way. . . .

Wrong standard is the definition to signal. . . . (Opposite for have in all model. . ..

 

Need modular signal: Size is equal, direction communicates signal instead.

In all modular signal: Size is equal. Way is same.

 

In circuit of the enlarge that need branch, often mention in all modular signal and wrong standard signal. Magnify in poor cent signal of model of circuit the Communist Party of China won’t be magnified, understandable the voltaic type that causes for the Wen Piao of dynatron, put forward for visualize Wen Piao in all modular signal, wrong standard signal is input signal, it is Ui, it is the object of enlarge.

 

In differential enlarge circuit, have two inputs end, should input the signal with phasic and equal, opposite size respectively on these two terminal, (This is useful signal) amplifier can produce very big enlarge multiple, we call this kind of signal wrong standard signal, at this moment enlarge multiple calls the enlarge that need a standard multiple. If be in,two inputs end inputs size respectively equal, phasic and identical signal, (This is actual the signal that is as a result of temperature change generation of on one class, it is a kind of harmful thing) , we are called this kind of signal in all modular signal, at this moment enlarge multiple is called in all modular enlarge multiple. As a result of differential enlarge circuit form a characteristic, circuit is right in all modular signal has very strong negative feedback, so in all modular enlarge multiple is very small. (Be less than 1) computation formula to be divided again commonly output He Shuangduan for Chan Duan, have 4 so in all modular signal and wrong standard signal are the input signal when showing double end inputs differential amplifier.

 

In all modular signal: When double end is inputted, two signal are identical.

 

Need modular signal: When double end is inputted, of two signal phasic differ 180 degrees.

 

Two any signal can be decomposed for in all modular signal and wrong standard signal.

 

Set two-way to input signal to be respectively: A, b.

 

M, n is input signal A respectively, of B in all modular signal composition and composition of wrong standard signal.

 

Input signal A, b can express to be respectively: A=m+n;B=m-n

 

Input signal A, b can regard as in all modular signal M and the synthesis that differ modular signal N.

 

Among them M=(A+B)/2;n=(A-B)/2.

 

Differential amplifier makes two signal difference, regard output as signal. The signal that outputs is A-B, with former in two signal in all modular signal and wrong standard signal are compared, can discover:

 

In all modular signal M=(A+B)/2 disappeared, and N=(A-B)/2 of wrong standard signal gets the enlarge of double.

 

This differs the working principle of modular amplifier namely.

 

In all the model is restrained than

 

To explain differential magnifies circuit is restrained in all the ability of modular signal, commonly used in all the model restrains assimilate to to be measured for index of a technology, its definition is amplifier to magnify to needing the voltage of modular signal diploid Aud and right in all the voltage enlarge of modular signal is diploid of Auc than, call in all the model is restrained than, english full name is Common Mode Rejection Ratio, because this is general,express with logogram CMRR.

 

Aud of multiple of enlarge of voltage of wrong standard signal is bigger, in all Auc of multiple of enlarge of modular signal voltage is smaller, criterion CMRR is bigger. Right now circuit of poor cent enlarge is restrained in all the capability of modular signal is stronger, the performance of amplifier is better. When differential enlarge circuit is completely symmetrical, in all Auc=0 of multiple of enlarge of modular signal voltage, criterion in all the model is restrained than CCMR→∞ , this is good case, actually circuit is nonexistent symmetrically completely, in all the model is restrained than tending impossibly also infinity.