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Determine the amount of shift happens in level shifter?

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+1 vote
in Linear Integrated Circuits by (37.1k points)
Determine the amount of shift happens in level shifter?

(a) Vcc + 0.7v

(b) Vcc – 0.7v

(c) -0.7v

(d) +0.7v

I have been asked this question in class test.

The doubt is from Operational Amplifier Internal Circuit in portion Operational Amplifier of Linear Integrated Circuits

1 Answer

0 votes
by (39.8k points)
Accurate answer is (c) -0.7v

Break it down: Level shifter is basically a simple type emitter follower. Hence, level shifter also act as a buffer to isolate high gain stages from the output stage. Therefore, the amount of shift obtained is

VO – Vi = -VBE = -0.7v.

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