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since an op-amp has very high open loop gain, the potential difference b/w its inputs tend to zero when a feedback n/w is implemented.to acheive a reasonable voltage at the output and thus equilibrium in the system,the output supplies the inverting input with enough voltage.the inverting input although not connected to ground,will assume a similar potential ,becoming a VIRTUAL GROUND...
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What is virtual ground and virtual short circuit?
VIRTUAL GROUND:-1]If the non-inverting (+) terminal of OP-AMP is connected to ground, then due to the "virtual short" existing between the two input terminals, the inverting (-) terminal also be at ground potential. hence it is said to be as "virtual ground".2]similarly if the inverting (-) terminal is connected to ground, then the non- inverting (+) terminal will be at "virtual ground" potential.3]The concept of virtual ground has been used extensively for amplifier analysis, specially we use this concept in the inverting amplifier.VIRTUAL SHORT:-1] The input impedance (Ri) of an OP-AMP is ideally infinite. Hence current "I" flowing from one input terminal to the other will be zero.2] Thus the voltage drop across Ri will be zero and both input terminals will be at the same potential. In other words they are virtually shorted to each other.
The virtual machine concept calls for multiprogramming or time sharing at the what level?
Operating System level.
What is virtual machine concept?
A 'virtual machine' is a software program which emulates another machine type. The virtual machine behaves exactly like the machine it emulates but uses the physical hardware of the machine it is running on. In other words, it translates calls intended for the virtual machine into calls that will execute upon the physical machine, effectively acting as an interpreter between the two machines.
Is an abstract class virtual by default?
Unlike abstract class in C++, the abstract class in C# does not have any methods defined as virtual by default. The concept of virtual are not the same between C# and C++, either. Any virtual method must be defined explicitly in C#. Related to abstract methods - interestingly, an abstract class in C# does not have to have any abstract methods. However, the reverse, if a class need to have at least one abstract method, that class must be defined as abstract.
What is the difference between concept and construct in research method?
Concept - A concept is a generally accepted collection of meanings or characteristics that are concrete whereas a construct- construct is image or idea invented for a particular theory or research problem; a construct is an abstract concept. To successfully perform a research, we must form common ground; hence, the need for concepts and constructs.
What is difference between Real image and virtual image?
Real image-They are formed by actual intersection of light rays.It is inverted.It can be projected on a screen.It is formed on the mirror.Virtual image-It is formed when rays appear to meet at a point.It is laterally inverted and erect.It cannot be projected on a screen.It is formed behind the mirror.
What is virtual ground and virtual short circuit?
VIRTUAL GROUND:-1]If the non-inverting (+) terminal of OP-AMP is connected to ground, then due to the "virtual short" existing between the two input terminals, the inverting (-) terminal also be at ground potential. hence it is said to be as "virtual ground".2]similarly if the inverting (-) terminal is connected to ground, then the non- inverting (+) terminal will be at "virtual ground" potential.3]The concept of virtual ground has been used extensively for amplifier analysis, specially we use this concept in the inverting amplifier.VIRTUAL SHORT:-1] The input impedance (Ri) of an OP-AMP is ideally infinite. Hence current "I" flowing from one input terminal to the other will be zero.2] Thus the voltage drop across Ri will be zero and both input terminals will be at the same potential. In other words they are virtually shorted to each other.
What is virtual ground concept?
In case of Operational Amplifier,the voltage gain is very high. So by AV=Vo/Vi we can conclude that Vi is very small quantity. Approximately we can take Vi=0. So potential difference between input terminals becomes zero.And in most of the cases we consider a terminal grounded.So potential of other terminal also becomes zero. This is called Virtual Ground Concept.
Why virtual concept is removed in java?
It is not actually removed.. AS i surfed randomly.. the point they stressed is all methods in java are virtual by default.. Hence there is not explicit virtual concept.. They are virtual cos tey check for the object refrence only dynamicaly.. i.e dynamic lookup.. a
What is ordinary ground and virtual ground in difference?
Ordinary is when you can physically stand on this said ground. Virtual ground occurs when the ground is virtually the same between two disagreeing parties. EX: I like cake and you like cake. That is virtual ground in an argument. Whereas, a disagreement would be an atheist going to Church. However that's a paradox...
Should op amp remain in active region for virtual ground?
An op amp must remain in its active region for virtual ground to be preserved.
How developing countries can embrace the concept of virtual workplace?
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Which characteristics of Op-Amp is responsible for virtual ground?
The main parameter responsible for virtual ground of an Op-Amp is Input Impedance . Generally , for an Op-Amp it is very high . So , we can conclude that the characteristics of an Op-Amp responsible for virtual ground is high input impedance .
What is the principle of virtual ground?
If no current flows between two points. ONE point is grounded then other point is said to be virtually grounded. THIS is called principle of virtual ground.
What is feedback resistance and what is it's use?
Feedback resistance is used to feed back the current obtained at output back into the circuit. Thus a virtual ground concept is developed.this is majorly used in applications of OPAMP[IC 741].
What is virtual ground in an op amp?
0 volt reference
What is Virtual ground?
You can see at http://en.wikipedia.org/wiki/Virtual_ground.
