Question

Which is the correct option for the circuit shown below to get an output \( V_o \) as \( -V_{cc} \)? 

• A. \( V_{ref}>V_{in} \)
• B. \( V_{ref}<V_{in} \)
• C. \( V_{ref} = V_{in} \)
• D. None of the above

Hint:

In inverting comparator circuits, compare input and reference voltages to determine the output polarity.

Answer 1

The Correct Option is B

- For an op-amp inverting comparator circuit, the output becomes negative when the input voltage \( V_{in} \) exceeds the reference voltage \( V_{ref} \). 
- Therefore, for \( V_o = -V_{cc} \), the condition is \( V_{ref}<V_{in} \). 
Conclusion: The correct condition is given by option (b).