queries on some basic electronics concept?

Question

1. what is the difference b/w floating load and grounded load

2.why op-amp has a saturation value of output voltage...im mean i would like to know the theory of this phenomenon

Answer 1

A 'floating load' is one in which neither end of the load terminals are connected directly to ground. An example might be the primary winding of a transformer that's being driven by a full bridge driver. A grounded load (as you might guess) is a load with one end connected to the driving circuit common (or ground).

The saturation voltage of an op-amp is simply the output voltage obtained when the op-amp is no longer capable of amplifying further. It's really a measure of the Vce(sat) of the output stage transistors. If you have an op-amp powered by +15V and -15V, it will typically slew to around +12V and -12V on it's output. It obviously can't go any higher that +15V or lower than -15V.

HTH

Doug

Answer 2

GROUNDED LOAD:- it is that load resistor which is directly connected to the ground . like 555timer "normally off load" is connceted b/w pin3 and ground.
FLOATING LOAD:- it is that load which is not connected to the ground directly but still we get the o/p .like the normally on load which is connected b/w Vcc and pin3.


in 741c op-amp ic the vcc and vee are the biasing voltages
well this is fact that is seen by several practicals that the o/p vol. of opamp cant exceed the biasing vol. i.e Vout is slightly less then the biasing vol.
the concept behind this fact is the "Q-point" .
while in the d.c analysis of op-amp the vertical axis is of vol and horizontal axis is of current.
when we plot the d.c load line it is seen that line forms, will have intercepts Vcc and Ic .
now , the Q-point can not exceed the Vcc.
so i think now it is clear that why o/p vol. of op-amp saturates at a critical value .
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Bye.

Answer 3

In a silicon transistor, the collector leakage modern is so small that it incredibly is negligible for any favourite circuit. At very intense temps it is going to become a element, yet it incredibly is the reason maximum digital circuits are constrained to operation under 250F.