An op-amp configured as an open loop comparator does what?

An op-amp configured as an open loop comparator does what?

• A. Amplifies signal
• B. Compares voltages
• C. Integrates input
• D. Filters

Answer: (B)

Open-loop operation of an op-amp makes it function as a voltage comparator. With no feedback to limit or control gain, the amplifier’s very large open-loop gain means that even a tiny difference between the two input voltages drives the output to one of the supply rails, producing a clear high or low signal rather than a proportional, linear amplification. The outcome depends on which input is higher: if the noninverting input exceeds the inverting input, the output goes toward the positive rail; if not, it goes toward the negative rail. This makes it ideal for deciding which voltage is larger quickly, though it’s sensitive to offsets and noise and isn’t suitable for linear amplification. It doesn’t implement integration or filtering in this mode, which require different configurations.

Open-loop operation of an op-amp makes it function as a voltage comparator. With no feedback to limit or control gain, the amplifier’s very large open-loop gain means that even a tiny difference between the two input voltages drives the output to one of the supply rails, producing a clear high or low signal rather than a proportional, linear amplification. The outcome depends on which input is higher: if the noninverting input exceeds the inverting input, the output goes toward the positive rail; if not, it goes toward the negative rail. This makes it ideal for deciding which voltage is larger quickly, though it’s sensitive to offsets and noise and isn’t suitable for linear amplification. It doesn’t implement integration or filtering in this mode, which require different configurations.