what do u mean by offset voltage in case of an op amp.Can u give me the difference b/w i/p & o/p offset voltag

Answer 1

The input to an op-amp is a differential amplifier. Because of slight differences in the two input transistors (one for each input), a small differential voltage is present even if you short out both inputs to ground.

I am not quite sure what you mean by i/p and o/p offset voltage. I assume you mean input and output offset, but there is no output offset in an op-amp. There is, however, offset voltage *relative* to the input and the output.

Offset voltage relative to the input is the actual voltage you need to apply to the input terminals (like 50 microvolts) to force the output to be exactly zero.

Offset voltage relative to the output is the voltage you read at the output of the amplifier when both inputs are shorted to ground (zero volts relative to the power supplies). Which should be the same as the offset voltage relative to the input.

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Answer 2

Offset Voltage

Answer 3

An op amp is a very high gain amplifier, with two inputs one inverting and one 'straight through. The input offset voltage is caused by slight variations in the gain between the two sides. The output offset is the input offset multiplied by the gain of the amp. since the op amp gain may be in the range of 100dB
The input variation can be very small indeed and still show up in the output. Good circuit design can minimize or reduce output offset completely

Answer 4

an op-amp is built up of a combination of transistors. in order to amplify and input applied all of the transistors have to be appropriately biased, this means that a certain current through and voltage across each of the transistors will have to be present before any input is applied (exact values depending on devices and implementation). When they are all biased you will find that as a result it's nearly impossible to get the input and output terminals to have a 0V DC level (i.e.since they are not zero, they have an 'offset').
a 0V level is desirable since usually a split supply (i.e.+/-12V) is used and this then allows for the greatest range of signals at the input.
in practice the offset voltages are never zero. the fact is that the temperature of the devices will affect the biasing so even if you have zero offset for one instant it will soon change as parts heat up.

Answer 5

Input offset CURRENT is essentially a measure of output leakage or error current. There is no practical way of dealing with this other than to make sure that the error of input offset X feedback resistance doesn't go over your tolerance spec. Offset Voltage is the differential between inputs. To lessen it's effects, make sure the impedance seen by both input pins is the same ie:match the resistance looking out of both pins.

Answer 6

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