In this script, we will discuss the most important topic of Operational Amplifier, we have already discussed this topic in another script
- What is Ideal Operational Amplifier?
- Characteristics of Ideal Operational Amplifier
- Two important properties of the ideal op-amp
- Math
- What is Ideal Operational Amplifier?
- Characteristics of Ideal Operational Amplifier
- Two important properties of the ideal op-amp
- Math
Now we will discuss
- What is Virtual Ground?
- Using Infinite Voltage Gain
- Importance of virtual ground in op-amp?
- Application of Virtual Ground
- Difference between Virtual Ground and Real Ground
- What is Virtual Ground?
- Using Infinite Voltage Gain
- Importance of virtual ground in op-amp?
- Application of Virtual Ground
- Difference between Virtual Ground and Real Ground
If you have any electrical, or electronics science doubts, then Contact Us.
What is Virtual Ground?
In electronics, a node may have any value of current or voltage but physical implementations of a virtual ground will have limitations of current handling ability and a non-zero impedances which may have practical side effects. In op-amps, the term virtual ground means that the voltage at that particular node is almost equal to the ground voltage (0V). It is not physically connected to the ground.
Using Infinite Voltage Gain
It is clear that an ideal op-amp will provide infinite voltage gain. For real op-amps also the gain will be very high such that we can consider it as infinite for solve purposes.
- Gain = Vo/Vin
- As the gain is infinite, Vin = 0
- Vin = V2 – V1
In the above figure V1 is connected to ground, so V1 = 0. Thus V2 also will be at ground potential.
- V2 = 0
Importance of virtual ground in op-amp?
We know virtual ground means that the voltage at that particular node is almost equal to ground voltage (0V). The virtual Ground concept is very useful in the analysis of an op-amp when negative feedback is employed. It will simply a lot of calculations and derivations.
Application of Virtual Ground
1) It will simply a lot of calculations and derivations.
2)It is provides useful practical circuit effects that would be difficult to achieve in other ways.
3)It makes Op Amp circuit analysis much easier
Difference between Virtual Ground and Real Ground
Virtual Ground | Real Ground |
---|---|
1)It is a concept that is made for easy explanation and calculation purposes. | 1)It is a terminal that is physically connected to ground |
2)Voltage is approximately Zero | 2)Voltage is Zero |
3)It is not an infinite current sink | 3)It is an infinite current sink |
4)Not electrically connected to Ground | 4)Electrically connected to Ground |
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