Why is it mandatory to use or connect a level translator circuit after the intermediate stage in a typical operational amplifier?

Q.  Why is it mandatory to use or connect a level translator circuit after the intermediate stage in a typical operational amplifier?
- Published on 23 Oct 15

a. For Phase level shifting
b. For DC level shifting
c. For AC level shifting
d. Both AC & DC Level shifting

ANSWER: For DC level shifting
 
Level shifter or translator is usually connected in a typical Op-Amp so as to shift the DC Level at the output of intermediate stage which is grounded onward to zero. Intermediate stage is basically a differential amplifier which is driven by the previous state output. The DC Level at the output of intermediate stage is good above ground potential in case of direct coupling. Hence, it is obligatory to use the level shifter in OP-Amps.

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